From 010a0e553a51dc7cfe6ccd78dd5caada4a971195 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jorge=20Tim=C3=B3n?= <jtimon@jtimon.cc>
Date: Thu, 22 Aug 2019 18:17:31 +0200
Subject: [PATCH 01/31] Tests: Use self.chain instead of 'regtest' in all
 current tests

---
 test/functional/feature_abortnode.py    |  2 +-
 test/functional/feature_config_args.py  | 12 +++++------
 test/functional/feature_filelock.py     |  2 +-
 test/functional/feature_logging.py      |  2 +-
 test/functional/feature_pruning.py      |  4 ++--
 test/functional/interface_rpc.py        |  2 +-
 test/functional/mempool_persist.py      |  4 ++--
 test/functional/mining_basic.py         |  2 +-
 test/functional/rpc_scantxoutset.py     |  2 +-
 test/functional/tool_wallet.py          |  2 +-
 test/functional/wallet_backup.py        | 28 ++++++++++++-------------
 test/functional/wallet_hd.py            | 14 ++++++-------
 test/functional/wallet_keypool_topup.py |  2 +-
 test/functional/wallet_multiwallet.py   |  4 ++--
 test/functional/wallet_reorgsrestore.py |  2 +-
 15 files changed, 42 insertions(+), 42 deletions(-)

diff --git a/test/functional/feature_abortnode.py b/test/functional/feature_abortnode.py
index 62c3eca07defd..874243ec5d633 100755
--- a/test/functional/feature_abortnode.py
+++ b/test/functional/feature_abortnode.py
@@ -29,7 +29,7 @@ def run_test(self):
         datadir = get_datadir_path(self.options.tmpdir, 0)
 
         # Deleting the undo file will result in reorg failure
-        os.unlink(os.path.join(datadir, 'regtest', 'blocks', 'rev00000.dat'))
+        os.unlink(os.path.join(datadir, self.chain, 'blocks', 'rev00000.dat'))
 
         # Connecting to a node with a more work chain will trigger a reorg
         # attempt.
diff --git a/test/functional/feature_config_args.py b/test/functional/feature_config_args.py
index b997c760257d8..1b1ff14151e15 100755
--- a/test/functional/feature_config_args.py
+++ b/test/functional/feature_config_args.py
@@ -38,7 +38,7 @@ def test_config_file_parser(self):
         if self.is_wallet_compiled():
             with open(inc_conf_file_path, 'w', encoding='utf8') as conf:
                 conf.write("wallet=foo\n")
-            self.nodes[0].assert_start_raises_init_error(expected_msg='Error: Config setting for -wallet only applied on regtest network when in [regtest] section.')
+            self.nodes[0].assert_start_raises_init_error(expected_msg='Error: Config setting for -wallet only applied on %s network when in [%s] section.' % (self.chain, self.chain))
 
         with open(inc_conf_file_path, 'w', encoding='utf-8') as conf:
             conf.write('regtest=0\n') # mainnet
@@ -103,7 +103,7 @@ def run_test(self):
         # Check that using non-existent datadir in conf file fails
         conf_file = os.path.join(default_data_dir, "bitcoin.conf")
 
-        # datadir needs to be set before [regtest] section
+        # datadir needs to be set before [chain] section
         conf_file_contents = open(conf_file, encoding='utf8').read()
         with open(conf_file, 'w', encoding='utf8') as f:
             f.write("datadir=" + new_data_dir + "\n")
@@ -115,17 +115,17 @@ def run_test(self):
         os.mkdir(new_data_dir)
         self.start_node(0, ['-conf='+conf_file, '-wallet=w1'])
         self.stop_node(0)
-        assert os.path.exists(os.path.join(new_data_dir, 'regtest', 'blocks'))
+        assert os.path.exists(os.path.join(new_data_dir, self.chain, 'blocks'))
         if self.is_wallet_compiled():
-            assert os.path.exists(os.path.join(new_data_dir, 'regtest', 'wallets', 'w1'))
+            assert os.path.exists(os.path.join(new_data_dir, self.chain, 'wallets', 'w1'))
 
         # Ensure command line argument overrides datadir in conf
         os.mkdir(new_data_dir_2)
         self.nodes[0].datadir = new_data_dir_2
         self.start_node(0, ['-datadir='+new_data_dir_2, '-conf='+conf_file, '-wallet=w2'])
-        assert os.path.exists(os.path.join(new_data_dir_2, 'regtest', 'blocks'))
+        assert os.path.exists(os.path.join(new_data_dir_2, self.chain, 'blocks'))
         if self.is_wallet_compiled():
-            assert os.path.exists(os.path.join(new_data_dir_2, 'regtest', 'wallets', 'w2'))
+            assert os.path.exists(os.path.join(new_data_dir_2, self.chain, 'wallets', 'w2'))
 
 
 if __name__ == '__main__':
diff --git a/test/functional/feature_filelock.py b/test/functional/feature_filelock.py
index ba116e41f5df5..89843f84f7c9e 100755
--- a/test/functional/feature_filelock.py
+++ b/test/functional/feature_filelock.py
@@ -19,7 +19,7 @@ def setup_network(self):
         self.nodes[0].wait_for_rpc_connection()
 
     def run_test(self):
-        datadir = os.path.join(self.nodes[0].datadir, 'regtest')
+        datadir = os.path.join(self.nodes[0].datadir, self.chain)
         self.log.info("Using datadir {}".format(datadir))
 
         self.log.info("Check that we can't start a second bitcoind instance using the same datadir")
diff --git a/test/functional/feature_logging.py b/test/functional/feature_logging.py
index e6ff21ee9c5ce..4065572510bc1 100755
--- a/test/functional/feature_logging.py
+++ b/test/functional/feature_logging.py
@@ -16,7 +16,7 @@ def set_test_params(self):
         self.setup_clean_chain = True
 
     def relative_log_path(self, name):
-        return os.path.join(self.nodes[0].datadir, "regtest", name)
+        return os.path.join(self.nodes[0].datadir, self.chain, name)
 
     def run_test(self):
         # test default log file name
diff --git a/test/functional/feature_pruning.py b/test/functional/feature_pruning.py
index 727f4b9589e94..b263232622127 100755
--- a/test/functional/feature_pruning.py
+++ b/test/functional/feature_pruning.py
@@ -99,7 +99,7 @@ def skip_test_if_missing_module(self):
     def setup_network(self):
         self.setup_nodes()
 
-        self.prunedir = os.path.join(self.nodes[2].datadir, 'regtest', 'blocks', '')
+        self.prunedir = os.path.join(self.nodes[2].datadir, self.chain, 'blocks', '')
 
         connect_nodes(self.nodes[0], 1)
         connect_nodes(self.nodes[1], 2)
@@ -277,7 +277,7 @@ def prune(index):
             assert_equal(ret, node.getblockchaininfo()['pruneheight'])
 
         def has_block(index):
-            return os.path.isfile(os.path.join(self.nodes[node_number].datadir, "regtest", "blocks", "blk{:05}.dat".format(index)))
+            return os.path.isfile(os.path.join(self.nodes[node_number].datadir, self.chain, "blocks", "blk{:05}.dat".format(index)))
 
         # should not prune because chain tip of node 3 (995) < PruneAfterHeight (1000)
         assert_raises_rpc_error(-1, "Blockchain is too short for pruning", node.pruneblockchain, height(500))
diff --git a/test/functional/interface_rpc.py b/test/functional/interface_rpc.py
index e99fa2264660f..62f5cd2771506 100755
--- a/test/functional/interface_rpc.py
+++ b/test/functional/interface_rpc.py
@@ -32,7 +32,7 @@ def test_getrpcinfo(self):
         command = info['active_commands'][0]
         assert_equal(command['method'], 'getrpcinfo')
         assert_greater_than_or_equal(command['duration'], 0)
-        assert_equal(info['logpath'], os.path.join(self.nodes[0].datadir, 'regtest', 'debug.log'))
+        assert_equal(info['logpath'], os.path.join(self.nodes[0].datadir, self.chain, 'debug.log'))
 
     def test_batch_request(self):
         self.log.info("Testing basic JSON-RPC batch request...")
diff --git a/test/functional/mempool_persist.py b/test/functional/mempool_persist.py
index bb0169ee52860..4c9cd76239ded 100755
--- a/test/functional/mempool_persist.py
+++ b/test/functional/mempool_persist.py
@@ -109,8 +109,8 @@ def run_test(self):
         wait_until(lambda: self.nodes[0].getmempoolinfo()["loaded"])
         assert_equal(len(self.nodes[0].getrawmempool()), 5)
 
-        mempooldat0 = os.path.join(self.nodes[0].datadir, 'regtest', 'mempool.dat')
-        mempooldat1 = os.path.join(self.nodes[1].datadir, 'regtest', 'mempool.dat')
+        mempooldat0 = os.path.join(self.nodes[0].datadir, self.chain, 'mempool.dat')
+        mempooldat1 = os.path.join(self.nodes[1].datadir, self.chain, 'mempool.dat')
         self.log.debug("Remove the mempool.dat file. Verify that savemempool to disk via RPC re-creates it")
         os.remove(mempooldat0)
         self.nodes[0].savemempool()
diff --git a/test/functional/mining_basic.py b/test/functional/mining_basic.py
index 788aabc192c0e..934db53f29fd5 100755
--- a/test/functional/mining_basic.py
+++ b/test/functional/mining_basic.py
@@ -69,7 +69,7 @@ def assert_submitblock(block, result_str_1, result_str_2=None):
         self.log.info('getmininginfo')
         mining_info = node.getmininginfo()
         assert_equal(mining_info['blocks'], 200)
-        assert_equal(mining_info['chain'], 'regtest')
+        assert_equal(mining_info['chain'], self.chain)
         assert 'currentblocktx' not in mining_info
         assert 'currentblockweight' not in mining_info
         assert_equal(mining_info['difficulty'], Decimal('4.656542373906925E-10'))
diff --git a/test/functional/rpc_scantxoutset.py b/test/functional/rpc_scantxoutset.py
index 9f94d11a93f23..e08731dc97708 100755
--- a/test/functional/rpc_scantxoutset.py
+++ b/test/functional/rpc_scantxoutset.py
@@ -54,7 +54,7 @@ def run_test(self):
 
         self.log.info("Stop node, remove wallet, mine again some blocks...")
         self.stop_node(0)
-        shutil.rmtree(os.path.join(self.nodes[0].datadir, "regtest", 'wallets'))
+        shutil.rmtree(os.path.join(self.nodes[0].datadir, self.chain, 'wallets'))
         self.start_node(0)
         self.nodes[0].generate(110)
 
diff --git a/test/functional/tool_wallet.py b/test/functional/tool_wallet.py
index 28a65f7823894..f67279fcd2799 100755
--- a/test/functional/tool_wallet.py
+++ b/test/functional/tool_wallet.py
@@ -196,7 +196,7 @@ def test_getwalletinfo_on_different_wallet(self):
         self.log.debug('Wallet file shasum unchanged\n')
 
     def run_test(self):
-        self.wallet_path = os.path.join(self.nodes[0].datadir, 'regtest', 'wallets', 'wallet.dat')
+        self.wallet_path = os.path.join(self.nodes[0].datadir, self.chain, 'wallets', 'wallet.dat')
         self.test_invalid_tool_commands_and_args()
         # Warning: The following tests are order-dependent.
         self.test_tool_wallet_info()
diff --git a/test/functional/wallet_backup.py b/test/functional/wallet_backup.py
index 55c517e92f98c..d25f3d1789c5d 100755
--- a/test/functional/wallet_backup.py
+++ b/test/functional/wallet_backup.py
@@ -100,9 +100,9 @@ def stop_three(self):
         self.stop_node(2)
 
     def erase_three(self):
-        os.remove(os.path.join(self.nodes[0].datadir, 'regtest', 'wallets', 'wallet.dat'))
-        os.remove(os.path.join(self.nodes[1].datadir, 'regtest', 'wallets', 'wallet.dat'))
-        os.remove(os.path.join(self.nodes[2].datadir, 'regtest', 'wallets', 'wallet.dat'))
+        os.remove(os.path.join(self.nodes[0].datadir, self.chain, 'wallets', 'wallet.dat'))
+        os.remove(os.path.join(self.nodes[1].datadir, self.chain, 'wallets', 'wallet.dat'))
+        os.remove(os.path.join(self.nodes[2].datadir, self.chain, 'wallets', 'wallet.dat'))
 
     def run_test(self):
         self.log.info("Generating initial blockchain")
@@ -160,13 +160,13 @@ def run_test(self):
         self.erase_three()
 
         # Start node2 with no chain
-        shutil.rmtree(os.path.join(self.nodes[2].datadir, 'regtest', 'blocks'))
-        shutil.rmtree(os.path.join(self.nodes[2].datadir, 'regtest', 'chainstate'))
+        shutil.rmtree(os.path.join(self.nodes[2].datadir, self.chain, 'blocks'))
+        shutil.rmtree(os.path.join(self.nodes[2].datadir, self.chain, 'chainstate'))
 
         # Restore wallets from backup
-        shutil.copyfile(os.path.join(self.nodes[0].datadir, 'wallet.bak'), os.path.join(self.nodes[0].datadir, 'regtest', 'wallets', 'wallet.dat'))
-        shutil.copyfile(os.path.join(self.nodes[1].datadir, 'wallet.bak'), os.path.join(self.nodes[1].datadir, 'regtest', 'wallets', 'wallet.dat'))
-        shutil.copyfile(os.path.join(self.nodes[2].datadir, 'wallet.bak'), os.path.join(self.nodes[2].datadir, 'regtest', 'wallets', 'wallet.dat'))
+        shutil.copyfile(os.path.join(self.nodes[0].datadir, 'wallet.bak'), os.path.join(self.nodes[0].datadir, self.chain, 'wallets', 'wallet.dat'))
+        shutil.copyfile(os.path.join(self.nodes[1].datadir, 'wallet.bak'), os.path.join(self.nodes[1].datadir, self.chain, 'wallets', 'wallet.dat'))
+        shutil.copyfile(os.path.join(self.nodes[2].datadir, 'wallet.bak'), os.path.join(self.nodes[2].datadir, self.chain, 'wallets', 'wallet.dat'))
 
         self.log.info("Re-starting nodes")
         self.start_three()
@@ -181,8 +181,8 @@ def run_test(self):
         self.erase_three()
 
         #start node2 with no chain
-        shutil.rmtree(os.path.join(self.nodes[2].datadir, 'regtest', 'blocks'))
-        shutil.rmtree(os.path.join(self.nodes[2].datadir, 'regtest', 'chainstate'))
+        shutil.rmtree(os.path.join(self.nodes[2].datadir, self.chain, 'blocks'))
+        shutil.rmtree(os.path.join(self.nodes[2].datadir, self.chain, 'chainstate'))
 
         self.start_three()
 
@@ -202,10 +202,10 @@ def run_test(self):
 
         # Backup to source wallet file must fail
         sourcePaths = [
-            os.path.join(self.nodes[0].datadir, 'regtest', 'wallets', 'wallet.dat'),
-            os.path.join(self.nodes[0].datadir, 'regtest', '.', 'wallets', 'wallet.dat'),
-            os.path.join(self.nodes[0].datadir, 'regtest', 'wallets', ''),
-            os.path.join(self.nodes[0].datadir, 'regtest', 'wallets')]
+            os.path.join(self.nodes[0].datadir, self.chain, 'wallets', 'wallet.dat'),
+            os.path.join(self.nodes[0].datadir, self.chain, '.', 'wallets', 'wallet.dat'),
+            os.path.join(self.nodes[0].datadir, self.chain, 'wallets', ''),
+            os.path.join(self.nodes[0].datadir, self.chain, 'wallets')]
 
         for sourcePath in sourcePaths:
             assert_raises_rpc_error(-4, "backup failed", self.nodes[0].backupwallet, sourcePath)
diff --git a/test/functional/wallet_hd.py b/test/functional/wallet_hd.py
index 97172d8b82d1d..423bd56913516 100755
--- a/test/functional/wallet_hd.py
+++ b/test/functional/wallet_hd.py
@@ -67,11 +67,11 @@ def run_test(self):
 
         self.log.info("Restore backup ...")
         self.stop_node(1)
-        # we need to delete the complete regtest directory
+        # we need to delete the complete chain directory
         # otherwise node1 would auto-recover all funds in flag the keypool keys as used
-        shutil.rmtree(os.path.join(self.nodes[1].datadir, "regtest", "blocks"))
-        shutil.rmtree(os.path.join(self.nodes[1].datadir, "regtest", "chainstate"))
-        shutil.copyfile(os.path.join(self.nodes[1].datadir, "hd.bak"), os.path.join(self.nodes[1].datadir, "regtest", "wallets", "wallet.dat"))
+        shutil.rmtree(os.path.join(self.nodes[1].datadir, self.chain, "blocks"))
+        shutil.rmtree(os.path.join(self.nodes[1].datadir, self.chain, "chainstate"))
+        shutil.copyfile(os.path.join(self.nodes[1].datadir, "hd.bak"), os.path.join(self.nodes[1].datadir, self.chain, "wallets", "wallet.dat"))
         self.start_node(1)
 
         # Assert that derivation is deterministic
@@ -92,9 +92,9 @@ def run_test(self):
 
         # Try a RPC based rescan
         self.stop_node(1)
-        shutil.rmtree(os.path.join(self.nodes[1].datadir, "regtest", "blocks"))
-        shutil.rmtree(os.path.join(self.nodes[1].datadir, "regtest", "chainstate"))
-        shutil.copyfile(os.path.join(self.nodes[1].datadir, "hd.bak"), os.path.join(self.nodes[1].datadir, "regtest", "wallets", "wallet.dat"))
+        shutil.rmtree(os.path.join(self.nodes[1].datadir, self.chain, "blocks"))
+        shutil.rmtree(os.path.join(self.nodes[1].datadir, self.chain, "chainstate"))
+        shutil.copyfile(os.path.join(self.nodes[1].datadir, "hd.bak"), os.path.join(self.nodes[1].datadir, self.chain, "wallets", "wallet.dat"))
         self.start_node(1, extra_args=self.extra_args[1])
         connect_nodes_bi(self.nodes, 0, 1)
         self.sync_all()
diff --git a/test/functional/wallet_keypool_topup.py b/test/functional/wallet_keypool_topup.py
index 0014555ade7af..1e3476d64c4a2 100755
--- a/test/functional/wallet_keypool_topup.py
+++ b/test/functional/wallet_keypool_topup.py
@@ -30,7 +30,7 @@ def skip_test_if_missing_module(self):
         self.skip_if_no_wallet()
 
     def run_test(self):
-        wallet_path = os.path.join(self.nodes[1].datadir, "regtest", "wallets", "wallet.dat")
+        wallet_path = os.path.join(self.nodes[1].datadir, self.chain, "wallets", "wallet.dat")
         wallet_backup_path = os.path.join(self.nodes[1].datadir, "wallet.bak")
         self.nodes[0].generate(101)
 
diff --git a/test/functional/wallet_multiwallet.py b/test/functional/wallet_multiwallet.py
index 68bc45f9861d3..a089a1534ae7c 100755
--- a/test/functional/wallet_multiwallet.py
+++ b/test/functional/wallet_multiwallet.py
@@ -39,7 +39,7 @@ def add_options(self, parser):
     def run_test(self):
         node = self.nodes[0]
 
-        data_dir = lambda *p: os.path.join(node.datadir, 'regtest', *p)
+        data_dir = lambda *p: os.path.join(node.datadir, self.chain, *p)
         wallet_dir = lambda *p: data_dir('wallets', *p)
         wallet = lambda name: node.get_wallet_rpc(name)
 
@@ -187,7 +187,7 @@ def wallet_file(name):
         assert_equal(w4.getbalance(), 3)
 
         batch = w1.batch([w1.getblockchaininfo.get_request(), w1.getwalletinfo.get_request()])
-        assert_equal(batch[0]["result"]["chain"], "regtest")
+        assert_equal(batch[0]["result"]["chain"], self.chain)
         assert_equal(batch[1]["result"]["walletname"], "w1")
 
         self.log.info('Check for per-wallet settxfee call')
diff --git a/test/functional/wallet_reorgsrestore.py b/test/functional/wallet_reorgsrestore.py
index f48018e9fbe8f..497a5dd95e444 100755
--- a/test/functional/wallet_reorgsrestore.py
+++ b/test/functional/wallet_reorgsrestore.py
@@ -90,7 +90,7 @@ def run_test(self):
         # Node0 wallet file is loaded on longest sync'ed node1
         self.stop_node(1)
         self.nodes[0].backupwallet(os.path.join(self.nodes[0].datadir, 'wallet.bak'))
-        shutil.copyfile(os.path.join(self.nodes[0].datadir, 'wallet.bak'), os.path.join(self.nodes[1].datadir, 'regtest', 'wallet.dat'))
+        shutil.copyfile(os.path.join(self.nodes[0].datadir, 'wallet.bak'), os.path.join(self.nodes[1].datadir, self.chain, 'wallet.dat'))
         self.start_node(1)
         tx_after_reorg = self.nodes[1].gettransaction(txid)
         # Check that normal confirmed tx is confirmed again but with different blockhash

From e80f6cae1d39e44f2b2642e07e6482c119903d04 Mon Sep 17 00:00:00 2001
From: Gregory Sanders <gsanders87@gmail.com>
Date: Mon, 7 Nov 2016 14:03:42 -0500
Subject: [PATCH 02/31] 9102: Really don't validate genesis block

---
 src/txdb.cpp       |  8 +++++---
 src/validation.cpp | 34 +++++++++++++++++++---------------
 2 files changed, 24 insertions(+), 18 deletions(-)

diff --git a/src/txdb.cpp b/src/txdb.cpp
index 18be07e6dbb02..18c12dd66281a 100644
--- a/src/txdb.cpp
+++ b/src/txdb.cpp
@@ -274,9 +274,11 @@ bool CBlockTreeDB::LoadBlockIndexGuts(const Consensus::Params& consensusParams,
                 pindexNew->nStatus        = diskindex.nStatus;
                 pindexNew->nTx            = diskindex.nTx;
 
-                if (!CheckProofOfWork(pindexNew->GetBlockHash(), pindexNew->nBits, consensusParams))
-                    return error("%s: CheckProofOfWork failed: %s", __func__, pindexNew->ToString());
-
+                const uint256 block_hash = pindexNew->GetBlockHash();
+                if (!CheckProofOfWork(block_hash, pindexNew->nBits, consensusParams) &&
+                    block_hash != consensusParams.hashGenesisBlock) {
+                    return error("%s: CheckProofOfWork: %s, %s", __func__, block_hash.ToString(), pindexNew->ToString());
+                }
                 pcursor->Next();
             } else {
                 return error("%s: failed to read value", __func__);
diff --git a/src/validation.cpp b/src/validation.cpp
index d470fd5b6ebbf..772e0fd67199a 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -1009,8 +1009,11 @@ bool ReadBlockFromDisk(CBlock& block, const FlatFilePos& pos, const Consensus::P
     }
 
     // Check the header
-    if (!CheckProofOfWork(block.GetHash(), block.nBits, consensusParams))
+    const uint256 block_hash = block.GetHash();
+    if (!CheckProofOfWork(block_hash, block.nBits, consensusParams) &&
+        block_hash != consensusParams.hashGenesisBlock) {
         return error("ReadBlockFromDisk: Errors in block header at %s", pos.ToString());
+    }
 
     return true;
 }
@@ -1752,6 +1755,18 @@ bool CChainState::ConnectBlock(const CBlock& block, CValidationState& state, CBl
     assert(*pindex->phashBlock == block.GetHash());
     int64_t nTimeStart = GetTimeMicros();
 
+    // verify that the view's current state corresponds to the previous block
+    const uint256 hashPrevBlock = pindex->pprev == nullptr ? uint256() : pindex->pprev->GetBlockHash();
+    assert(hashPrevBlock == view.GetBestBlock());
+
+    // Special case for the genesis block, skipping connection of its transactions
+    // (its coinbase is unspendable)
+    if (block.GetHash() == chainparams.GetConsensus().hashGenesisBlock) {
+        if (!fJustCheck)
+            view.SetBestBlock(pindex->GetBlockHash());
+        return true;
+    }
+
     // Check it again in case a previous version let a bad block in
     // NOTE: We don't currently (re-)invoke ContextualCheckBlock() or
     // ContextualCheckBlockHeader() here. This means that if we add a new
@@ -1775,18 +1790,6 @@ bool CChainState::ConnectBlock(const CBlock& block, CValidationState& state, CBl
         return error("%s: Consensus::CheckBlock: %s", __func__, FormatStateMessage(state));
     }
 
-    // verify that the view's current state corresponds to the previous block
-    uint256 hashPrevBlock = pindex->pprev == nullptr ? uint256() : pindex->pprev->GetBlockHash();
-    assert(hashPrevBlock == view.GetBestBlock());
-
-    // Special case for the genesis block, skipping connection of its transactions
-    // (its coinbase is unspendable)
-    if (block.GetHash() == chainparams.GetConsensus().hashGenesisBlock) {
-        if (!fJustCheck)
-            view.SetBestBlock(pindex->GetBlockHash());
-        return true;
-    }
-
     nBlocksTotal++;
 
     bool fScriptChecks = true;
@@ -3515,8 +3518,9 @@ bool CChainState::AcceptBlock(const std::shared_ptr<const CBlock>& pblock, CVali
         if (pindex->nChainWork < nMinimumChainWork) return true;
     }
 
-    if (!CheckBlock(block, state, chainparams.GetConsensus()) ||
-        !ContextualCheckBlock(block, state, chainparams.GetConsensus(), pindex->pprev)) {
+    if (chainparams.GetConsensus().hashGenesisBlock != block.GetHash() &&
+        (!CheckBlock(block, state, chainparams.GetConsensus()) ||
+        !ContextualCheckBlock(block, state, chainparams.GetConsensus(), pindex->pprev))) {
         assert(IsBlockReason(state.GetReason()));
         if (state.IsInvalid() && state.GetReason() != ValidationInvalidReason::BLOCK_MUTATED) {
             pindex->nStatus |= BLOCK_FAILED_VALID;

From 628eddac688c4707d1fb3cb32abf6c8b9133edb4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jorge=20Tim=C3=B3n?= <jtimon@jtimon.cc>
Date: Thu, 20 Dec 2018 20:39:38 +0100
Subject: [PATCH 03/31] Config: Allow any chain/section name

---
 src/init.cpp                           |  5 -----
 src/util/system.cpp                    | 15 ---------------
 src/util/system.h                      |  5 -----
 test/functional/feature_config_args.py | 13 -------------
 4 files changed, 38 deletions(-)

diff --git a/src/init.cpp b/src/init.cpp
index bb82130542dea..41183a13d7397 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -938,11 +938,6 @@ bool AppInitParameterInteraction()
         return InitError(strprintf(_("Config setting for %s only applied on %s network when in [%s] section.").translated, arg, network, network));
     }
 
-    // Warn if unrecognized section name are present in the config file.
-    for (const auto& section : gArgs.GetUnrecognizedSections()) {
-        InitWarning(strprintf("%s:%i " + _("Section [%s] is not recognized.").translated, section.m_file, section.m_line, section.m_name));
-    }
-
     if (!fs::is_directory(GetBlocksDir())) {
         return InitError(strprintf(_("Specified blocks directory \"%s\" does not exist.").translated, gArgs.GetArg("-blocksdir", "").c_str()));
     }
diff --git a/src/util/system.cpp b/src/util/system.cpp
index 8098cde093830..00db76325eac6 100644
--- a/src/util/system.cpp
+++ b/src/util/system.cpp
@@ -352,21 +352,6 @@ const std::set<std::string> ArgsManager::GetUnsuitableSectionOnlyArgs() const
     return unsuitables;
 }
 
-const std::list<SectionInfo> ArgsManager::GetUnrecognizedSections() const
-{
-    // Section names to be recognized in the config file.
-    static const std::set<std::string> available_sections{
-        CBaseChainParams::REGTEST,
-        CBaseChainParams::TESTNET,
-        CBaseChainParams::MAIN
-    };
-
-    LOCK(cs_args);
-    std::list<SectionInfo> unrecognized = m_config_sections;
-    unrecognized.remove_if([](const SectionInfo& appeared){ return available_sections.find(appeared.m_name) != available_sections.end(); });
-    return unrecognized;
-}
-
 void ArgsManager::SelectConfigNetwork(const std::string& network)
 {
     LOCK(cs_args);
diff --git a/src/util/system.h b/src/util/system.h
index 908a3c407d3a8..44efa2219b8ea 100644
--- a/src/util/system.h
+++ b/src/util/system.h
@@ -185,11 +185,6 @@ class ArgsManager
      */
     const std::set<std::string> GetUnsuitableSectionOnlyArgs() const;
 
-    /**
-     * Log warnings for unrecognized section names in the config file.
-     */
-    const std::list<SectionInfo> GetUnrecognizedSections() const;
-
     /**
      * Return a vector of strings of the given argument
      *
diff --git a/test/functional/feature_config_args.py b/test/functional/feature_config_args.py
index 1b1ff14151e15..06a8d5b7eef9d 100755
--- a/test/functional/feature_config_args.py
+++ b/test/functional/feature_config_args.py
@@ -61,20 +61,7 @@ def test_config_file_parser(self):
             conf.write('server=1\nrpcuser=someuser\n[main]\nrpcpassword=some#pass')
         self.nodes[0].assert_start_raises_init_error(expected_msg='Error: Error reading configuration file: parse error on line 4, using # in rpcpassword can be ambiguous and should be avoided')
 
-        inc_conf_file2_path = os.path.join(self.nodes[0].datadir, 'include2.conf')
-        with open(os.path.join(self.nodes[0].datadir, 'bitcoin.conf'), 'a', encoding='utf-8') as conf:
-            conf.write('includeconf={}\n'.format(inc_conf_file2_path))
-
         with open(inc_conf_file_path, 'w', encoding='utf-8') as conf:
-            conf.write('testnot.datadir=1\n')
-        with open(inc_conf_file2_path, 'w', encoding='utf-8') as conf:
-            conf.write('[testnet]\n')
-        self.restart_node(0)
-        self.nodes[0].stop_node(expected_stderr='Warning: ' + inc_conf_file_path + ':1 Section [testnot] is not recognized.' + os.linesep + 'Warning: ' + inc_conf_file2_path + ':1 Section [testnet] is not recognized.')
-
-        with open(inc_conf_file_path, 'w', encoding='utf-8') as conf:
-            conf.write('')  # clear
-        with open(inc_conf_file2_path, 'w', encoding='utf-8') as conf:
             conf.write('')  # clear
 
     def test_log_buffer(self):

From d5ec6ffbfd63e6c5d07bd532d0eea5ed81f12b3b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jorge=20Tim=C3=B3n?= <jtimon@jtimon.cc>
Date: Fri, 21 Oct 2016 19:15:26 +0200
Subject: [PATCH 04/31] Testchains: Qt: Introduce custom chain whose
 constructor...

...reads params from regular arguments

Qt: Add a default purple and title for unkown chains
---
 src/chainparams.cpp     | 92 +++++++++++++++++++++++++++++++++++++++--
 src/chainparamsbase.cpp | 40 +++++++++++++++---
 src/qt/guiconstants.h   |  1 +
 src/qt/networkstyle.cpp |  2 +-
 4 files changed, 125 insertions(+), 10 deletions(-)

diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index ad766471dc133..de4ada8a280c5 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -7,6 +7,7 @@
 
 #include <chainparamsseeds.h>
 #include <consensus/merkle.h>
+#include <hash.h>
 #include <tinyformat.h>
 #include <util/system.h>
 #include <util/strencodings.h>
@@ -17,13 +18,13 @@
 #include <boost/algorithm/string/classification.hpp>
 #include <boost/algorithm/string/split.hpp>
 
-static CBlock CreateGenesisBlock(const char* pszTimestamp, const CScript& genesisOutputScript, uint32_t nTime, uint32_t nNonce, uint32_t nBits, int32_t nVersion, const CAmount& genesisReward)
+static CBlock CreateGenesisBlock(const CScript& coinbase_sig, const CScript& genesisOutputScript, uint32_t nTime, uint32_t nNonce, uint32_t nBits, int32_t nVersion, const CAmount& genesisReward)
 {
     CMutableTransaction txNew;
     txNew.nVersion = 1;
     txNew.vin.resize(1);
     txNew.vout.resize(1);
-    txNew.vin[0].scriptSig = CScript() << 486604799 << CScriptNum(4) << std::vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
+    txNew.vin[0].scriptSig = coinbase_sig;
     txNew.vout[0].nValue = genesisReward;
     txNew.vout[0].scriptPubKey = genesisOutputScript;
 
@@ -52,8 +53,16 @@ static CBlock CreateGenesisBlock(const char* pszTimestamp, const CScript& genesi
 static CBlock CreateGenesisBlock(uint32_t nTime, uint32_t nNonce, uint32_t nBits, int32_t nVersion, const CAmount& genesisReward)
 {
     const char* pszTimestamp = "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks";
+    const CScript coinbase_sig = CScript() << 486604799 << CScriptNum(4) << std::vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
+
     const CScript genesisOutputScript = CScript() << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f") << OP_CHECKSIG;
-    return CreateGenesisBlock(pszTimestamp, genesisOutputScript, nTime, nNonce, nBits, nVersion, genesisReward);
+    return CreateGenesisBlock(coinbase_sig, genesisOutputScript, nTime, nNonce, nBits, nVersion, genesisReward);
+}
+
+static CBlock CreateGenesisBlockWithHash(const uint256& hash)
+{
+    CScript coinbase_sig = CScript() << std::vector<uint8_t>(hash.begin(), hash.end());
+    return CreateGenesisBlock(coinbase_sig, CScript(OP_RETURN), 1296688602, 2, 0x207fffff, 1, 50 * COIN);
 }
 
 /**
@@ -376,6 +385,79 @@ void CRegTestParams::UpdateActivationParametersFromArgs(const ArgsManager& args)
     }
 }
 
+/**
+ * Custom params for testing.
+ */
+class CCustomParams : public CRegTestParams {
+    void UpdateFromArgs(ArgsManager& args)
+    {
+        UpdateActivationParametersFromArgs(args);
+
+        consensus.nSubsidyHalvingInterval = args.GetArg("-con_nsubsidyhalvinginterval", consensus.nSubsidyHalvingInterval);
+        consensus.BIP16Exception = uint256S(args.GetArg("-con_bip16exception", "0x0"));
+        consensus.BIP34Height = args.GetArg("-con_bip34height", consensus.BIP34Height);
+        consensus.BIP34Hash = uint256S(args.GetArg("-con_bip34hash", "0x0"));
+        consensus.BIP65Height = args.GetArg("-con_bip65height", consensus.BIP65Height);
+        consensus.BIP66Height = args.GetArg("-con_bip66height", consensus.BIP66Height);
+        consensus.powLimit = uint256S(args.GetArg("-con_powlimit", "7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"));
+        consensus.nPowTargetTimespan = args.GetArg("-con_npowtargettimespan", consensus.nPowTargetTimespan);
+        consensus.nPowTargetSpacing = args.GetArg("-con_npowtargetspacing", consensus.nPowTargetSpacing);
+        consensus.fPowAllowMinDifficultyBlocks = args.GetBoolArg("-con_fpowallowmindifficultyblocks", consensus.fPowAllowMinDifficultyBlocks);
+        consensus.fPowNoRetargeting = args.GetBoolArg("-con_fpownoretargeting", consensus.fPowNoRetargeting);
+        consensus.nRuleChangeActivationThreshold = (uint32_t)args.GetArg("-con_nrulechangeactivationthreshold", consensus.nRuleChangeActivationThreshold);
+        consensus.nMinerConfirmationWindow = (uint32_t)args.GetArg("-con_nminerconfirmationwindow", consensus.nMinerConfirmationWindow);
+
+        consensus.nMinimumChainWork = uint256S(args.GetArg("-con_nminimumchainwork", "0x0"));
+        consensus.defaultAssumeValid = uint256S(args.GetArg("-con_defaultassumevalid", "0x00"));
+
+        nDefaultPort = (uint64_t)args.GetArg("-ndefaultport", nDefaultPort);
+        nPruneAfterHeight = (uint64_t)args.GetArg("-npruneafterheight", nPruneAfterHeight);
+        m_assumed_blockchain_size = (uint64_t)args.GetArg("-assumed_blockchain_size", m_assumed_blockchain_size);
+        m_assumed_chain_state_size = (uint64_t)args.GetArg("-assumed_chain_state_size", m_assumed_chain_state_size);
+        fDefaultConsistencyChecks = args.GetBoolArg("-fdefaultconsistencychecks", fDefaultConsistencyChecks);
+        fRequireStandard = args.GetBoolArg("-frequirestandard", fRequireStandard);
+        m_is_test_chain = args.GetBoolArg("-is_test_chain", m_is_test_chain);
+
+        bech32_hrp = args.GetArg("-bech32_hrp", bech32_hrp);
+        base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1, args.GetArg("-pubkeyprefix", 111));
+        base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>(1, args.GetArg("-scriptprefix", 196));
+        base58Prefixes[SECRET_KEY] =     std::vector<unsigned char>(1, args.GetArg("-secretprefix", 239));
+
+        const std::string extpubprefix = args.GetArg("-extpubkeyprefix", "043587CF");
+        assert(IsHex(extpubprefix) && extpubprefix.size() == 8 && "-extpubkeyprefix must be hex string of length 8");
+        base58Prefixes[EXT_PUBLIC_KEY] = ParseHex(extpubprefix);
+
+        const std::string extprvprefix = args.GetArg("-extprvkeyprefix", "04358394");
+        assert(IsHex(extprvprefix) && extprvprefix.size() == 8 && "-extprvkeyprefix must be hex string of length 8");
+        base58Prefixes[EXT_SECRET_KEY] = ParseHex(extprvprefix);
+
+        const std::string magic_str = args.GetArg("-pchmessagestart", "FABFB5DA");
+        assert(IsHex(magic_str) && magic_str.size() == 8 && "-pchmessagestart must be hex string of length 8");
+        const std::vector<unsigned char> magic_byte = ParseHex(magic_str);
+        std::copy(begin(magic_byte), end(magic_byte), pchMessageStart);
+
+        vSeeds.clear();
+        if (gArgs.IsArgSet("-seednode")) {
+            const auto seednodes = gArgs.GetArgs("-seednode");
+            if (seednodes.size() != 1 || seednodes[0] != "0") {
+                vSeeds = seednodes;
+            }
+        }
+    }
+
+public:
+    CCustomParams(const std::string& chain, ArgsManager& args) : CRegTestParams(args)
+    {
+        strNetworkID = chain;
+        UpdateFromArgs(args);
+
+        CHashWriter h(SER_DISK, 0);
+        h << strNetworkID;
+        genesis = CreateGenesisBlockWithHash(h.GetHash());
+        consensus.hashGenesisBlock = genesis.GetHash();
+    }
+};
+
 static std::unique_ptr<const CChainParams> globalChainParams;
 
 const CChainParams &Params() {
@@ -385,13 +467,15 @@ const CChainParams &Params() {
 
 std::unique_ptr<const CChainParams> CreateChainParams(const std::string& chain)
 {
+    // Reserved names for non-custom chains
     if (chain == CBaseChainParams::MAIN)
         return std::unique_ptr<CChainParams>(new CMainParams());
     else if (chain == CBaseChainParams::TESTNET)
         return std::unique_ptr<CChainParams>(new CTestNetParams());
     else if (chain == CBaseChainParams::REGTEST)
         return std::unique_ptr<CChainParams>(new CRegTestParams(gArgs));
-    throw std::runtime_error(strprintf("%s: Unknown chain %s.", __func__, chain));
+
+    return std::unique_ptr<CChainParams>(new CCustomParams(chain, gArgs));
 }
 
 void SelectParams(const std::string& network)
diff --git a/src/chainparamsbase.cpp b/src/chainparamsbase.cpp
index 4bb66c8d8b512..5bf0ed78a2cd2 100644
--- a/src/chainparamsbase.cpp
+++ b/src/chainparamsbase.cpp
@@ -17,12 +17,42 @@ const std::string CBaseChainParams::REGTEST = "regtest";
 
 void SetupChainParamsBaseOptions()
 {
-    gArgs.AddArg("-chain=<chain>", "Use the chain <chain> (default: main). Allowed values: main, test, regtest", ArgsManager::ALLOW_ANY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-chain=<chain>", "Use the chain <chain> (default: main). Reserved values: main, test, regtest. With any other value, a custom chain is used.", ArgsManager::ALLOW_ANY, OptionsCategory::CHAINPARAMS);
     gArgs.AddArg("-regtest", "Enter regression test mode, which uses a special chain in which blocks can be solved instantly. "
                  "This is intended for regression testing tools and app development. Equivalent to -chain=regtest.", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
-    gArgs.AddArg("-segwitheight=<n>", "Set the activation height of segwit. -1 to disable. (regtest-only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-testnet", "Use the test chain. Equivalent to -chain=test.", ArgsManager::ALLOW_ANY, OptionsCategory::CHAINPARAMS);
-    gArgs.AddArg("-vbparams=deployment:start:end", "Use given start/end times for specified version bits deployment (regtest-only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-vbparams=deployment:start:end", "Use given start/end times for specified version bits deployment (regtest or custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-segwitheight=<n>", "Set the activation height of segwit. -1 to disable. (regtest or custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::DEBUG_TEST);
+    gArgs.AddArg("-con_nsubsidyhalvinginterval", "Number of blocks between one subsidy adjustment and the next one. Default: 150 (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-con_bip16exception", "A block hash not to validate BIP16 on. (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-con_bip34height", "Height from which BIP34 is enforced. Default: 500 (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-con_bip34hash", "Hardcoded hash for BIP34 activation corresponding to the bip34height so that bip30 checks can be saved. (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-con_bip65height", "Height from which BIP65 is enforced. Default: 1351 (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-con_bip66height", "Height from which BIP66 is enforced. Default: 1251 (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-con_powlimit", "Maximum proof of work target. Default 7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-con_npowtargettimespan", "Proof of work retargetting interval in seconds. Default: 2 weeks (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-con_npowtargetspacing", "Proof of work target for interval between blocks in seconds. Default: 600 (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-con_fpowallowmindifficultyblocks", "Whether the chain allows minimum difficulty blocks or not. Default: 1 (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-con_fpownoretargeting", "Whether the chain skips proof of work retargetting or not. Default: 1 (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-con_nminerconfirmationwindow", "Interval for BIP9 deployment activation. Default: 144 (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-con_nrulechangeactivationthreshold", "Minimum blocks to signal readiness for a chain for BIP9 activation. Default 108 (ie 75%). (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-con_nminimumchainwork", "The best chain should have at least this much work. Default: 0 (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-con_defaultassumevalid", "By default assume that the signatures in ancestors of this block are valid. Consider using -assumevalid instead. (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-ndefaultport", "The port to listen for connections on by default. Consider using -port instead of changing the default.  Default: 18444 (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-npruneafterheight", "Only start prunning after this height. Default: 1000 (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-assumed_blockchain_size", "Estimated current blockchain size (in GB) for UI purposes. Default 0 (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-assumed_chain_state_size", "Estimated current chain state size (in GB) for UI purposes. Default 0 (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-fdefaultconsistencychecks", "Whether -checkblockindex and -checkmempool are active by default or not. Consider using those options instead. Default: 1 (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-frequirestandard", "Whether standard policy rules are applied in the local mempool by default. Consider using -acceptnonstdtxn=0 instead of changing the default. Default: 0 (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-is_test_chain", "Whether it's allowed to set -acceptnonstdtxn=0 for this chain or not. It also affects the default for  -fallbackfee=0. Consider using -fallbackfee=0 instead of changing the default. Default: 1 (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-bech32_hrp", "Human readable part for bech32 addresses. See BIP173 for more info. Default: bcrt (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-pubkeyprefix", "Magic for base58 pubkeys. (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-scriptprefix", "Magic for base58 scripts. (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-secretprefix", "Magic for base58 secret keys. (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-extpubkeyprefix", "Magic for base58 external pubkeys. Default: 043587CF (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-extprvkeyprefix", "Magic for base58 external secret keys. Default: 04358394 (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-pchmessagestart", "Magic for p2p protocol. Default: FABFB5DA (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-seednode=<ip>", "Use specified node as seed node. This option can be specified multiple times to connect to multiple nodes. (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
 }
 
 static std::unique_ptr<CBaseChainParams> globalChainBaseParams;
@@ -41,8 +71,8 @@ std::unique_ptr<CBaseChainParams> CreateBaseChainParams(const std::string& chain
         return MakeUnique<CBaseChainParams>("testnet3", 18332);
     else if (chain == CBaseChainParams::REGTEST)
         return MakeUnique<CBaseChainParams>("regtest", 18443);
-    else
-        throw std::runtime_error(strprintf("%s: Unknown chain %s.", __func__, chain));
+
+    return MakeUnique<CBaseChainParams>(chain, 18553);
 }
 
 void SelectBaseParams(const std::string& chain)
diff --git a/src/qt/guiconstants.h b/src/qt/guiconstants.h
index dcdb2479770f8..fc27aef6617a7 100644
--- a/src/qt/guiconstants.h
+++ b/src/qt/guiconstants.h
@@ -47,6 +47,7 @@ static const int TOOLTIP_WRAP_THRESHOLD = 80;
 #define QAPP_APP_NAME_DEFAULT "Bitcoin-Qt"
 #define QAPP_APP_NAME_TESTNET "Bitcoin-Qt-testnet"
 #define QAPP_APP_NAME_REGTEST "Bitcoin-Qt-regtest"
+#define QAPP_APP_NAME_CUSTOM "Bitcoin-Qt-custom-chain"
 
 /* One gigabyte (GB) in bytes */
 static constexpr uint64_t GB_BYTES{1000000000};
diff --git a/src/qt/networkstyle.cpp b/src/qt/networkstyle.cpp
index 5c039a939eee0..dcb405b5d9c82 100644
--- a/src/qt/networkstyle.cpp
+++ b/src/qt/networkstyle.cpp
@@ -91,5 +91,5 @@ const NetworkStyle* NetworkStyle::instantiate(const std::string& networkId)
                     titleAddText.c_str());
         }
     }
-    return nullptr;
+    return new NetworkStyle(strprintf("%s-%s", QAPP_APP_NAME_CUSTOM, networkId).c_str(), 250, 30, titleAddText.c_str());
 }

From 165ee55e0aef8c074c89f6ac9bd64644dd8c855f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jorge=20Tim=C3=B3n?= <jtimon@jtimon.cc>
Date: Fri, 11 Nov 2016 00:06:44 +0100
Subject: [PATCH 05/31] QA: Adapt BitcoinTestFramework for chains other than
 "regtest"

---
 test/functional/feature_config_args.py | 4 ++--
 test/functional/test_framework/util.py | 2 +-
 test/functional/tool_wallet.py         | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/test/functional/feature_config_args.py b/test/functional/feature_config_args.py
index 06a8d5b7eef9d..1ad7cdd026986 100755
--- a/test/functional/feature_config_args.py
+++ b/test/functional/feature_config_args.py
@@ -41,9 +41,9 @@ def test_config_file_parser(self):
             self.nodes[0].assert_start_raises_init_error(expected_msg='Error: Config setting for -wallet only applied on %s network when in [%s] section.' % (self.chain, self.chain))
 
         with open(inc_conf_file_path, 'w', encoding='utf-8') as conf:
-            conf.write('regtest=0\n') # mainnet
+            conf.write('is_test_chain=0\n')
             conf.write('acceptnonstdtxn=1\n')
-        self.nodes[0].assert_start_raises_init_error(expected_msg='Error: acceptnonstdtxn is not currently supported for main chain')
+        self.nodes[0].assert_start_raises_init_error(expected_msg='Error: acceptnonstdtxn is not currently supported for %s chain' % self.chain)
 
         with open(inc_conf_file_path, 'w', encoding='utf-8') as conf:
             conf.write('nono\n')
diff --git a/test/functional/test_framework/util.py b/test/functional/test_framework/util.py
index 6d74447ada369..998cf207fe094 100644
--- a/test/functional/test_framework/util.py
+++ b/test/functional/test_framework/util.py
@@ -288,7 +288,7 @@ def initialize_datadir(dirname, n, chain):
     if not os.path.isdir(datadir):
         os.makedirs(datadir)
     with open(os.path.join(datadir, "bitcoin.conf"), 'w', encoding='utf8') as f:
-        f.write("{}=1\n".format(chain))
+        f.write("chain={}\n".format(chain))
         f.write("[{}]\n".format(chain))
         f.write("port=" + str(p2p_port(n)) + "\n")
         f.write("rpcport=" + str(rpc_port(n)) + "\n")
diff --git a/test/functional/tool_wallet.py b/test/functional/tool_wallet.py
index f67279fcd2799..482590b9fe3e5 100755
--- a/test/functional/tool_wallet.py
+++ b/test/functional/tool_wallet.py
@@ -25,7 +25,7 @@ def skip_test_if_missing_module(self):
 
     def bitcoin_wallet_process(self, *args):
         binary = self.config["environment"]["BUILDDIR"] + '/src/bitcoin-wallet' + self.config["environment"]["EXEEXT"]
-        args = ['-datadir={}'.format(self.nodes[0].datadir), '-regtest'] + list(args)
+        args = ['-datadir={}'.format(self.nodes[0].datadir), '-chain=%s' % self.chain] + list(args)
         return subprocess.Popen([binary] + args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)
 
     def assert_raises_tool_error(self, error, *args):

From da2d1de3b72bb51f0a1dd914d3f5a762bb6030a4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jorge=20Tim=C3=B3n?= <jtimon@jtimon.cc>
Date: Thu, 10 Nov 2016 19:51:54 +0100
Subject: [PATCH 06/31] QA: Use resgtest2 chain instead of regtest for rpc
 tests

---
 test/README.md                                |   2 +-
 test/functional/combine_logs.py               |   2 +-
 test/functional/data/rpc_getblockstats.json   | 214 +++++++++---------
 .../test_framework/test_framework.py          |   2 +-
 4 files changed, 110 insertions(+), 110 deletions(-)

diff --git a/test/README.md b/test/README.md
index 8f08b7afe4fc6..557da6d19c174 100644
--- a/test/README.md
+++ b/test/README.md
@@ -193,7 +193,7 @@ For instance, to attach to `self.node[1]` during a run:
 use the directory path to get the pid from the pid file:
 
 ```bash
-cat /tmp/user/1000/testo9vsdjo3/node1/regtest/bitcoind.pid
+cat /tmp/user/1000/testo9vsdjo3/node1/regtest2/bitcoind.pid
 gdb /home/example/bitcoind <pid>
 ```
 
diff --git a/test/functional/combine_logs.py b/test/functional/combine_logs.py
index 367d0f69165b6..0fe5d3015bec7 100755
--- a/test/functional/combine_logs.py
+++ b/test/functional/combine_logs.py
@@ -83,7 +83,7 @@ def read_logs(tmp_dir):
         chain = chain[0]  # pick the first one if more than one chain was found (should never happen)
         chain = re.search(r'node0/(.+?)/debug\.log$', chain).group(1)  # extract the chain name
     else:
-        chain = 'regtest'  # fallback to regtest (should only happen when none exists)
+        chain = 'regtest2'  # fallback to regtest2 (should only happen when none exists)
 
     files = [("test", "%s/test_framework.log" % tmp_dir)]
     for i in itertools.count():
diff --git a/test/functional/data/rpc_getblockstats.json b/test/functional/data/rpc_getblockstats.json
index 16dbc5fe601b4..9910f9b243390 100644
--- a/test/functional/data/rpc_getblockstats.json
+++ b/test/functional/data/rpc_getblockstats.json
@@ -1,109 +1,109 @@
 {
   "blocks": [
-    "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",
-    "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",
-    "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",
-    "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",
-    "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",
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-    "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",
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   ],
   "mocktime": 1525107225,
   "stats": [
@@ -111,7 +111,7 @@
       "avgfee": 0,
       "avgfeerate": 0,
       "avgtxsize": 0,
-      "blockhash": "29a36876ddc6899a2541afc78ce2b3ca7659cfc01875e8208d9110d59bce3a9b",
+      "blockhash": "033db209641f9f5116a67a1af95d3d867655cd74cf48eff1f42d1945a107b76e",
       "feerate_percentiles": [
         0,
         0,
@@ -148,7 +148,7 @@
       "avgfee": 4460,
       "avgfeerate": 20,
       "avgtxsize": 223,
-      "blockhash": "0aa1cae78efd1efcd5203366a257b6ccf4c9e4960f6b8a3724ad790ab568a10f",
+      "blockhash": "3c13fd0ffc12e8f80afc176cc2dde866653b49f158e486d8b3812f09942c1471",
       "feerate_percentiles": [
         20,
         20,
@@ -185,7 +185,7 @@
       "avgfee": 24906,
       "avgfeerate": 121,
       "avgtxsize": 231,
-      "blockhash": "53e416e2538bc783c42a7aea566e884321afed893e9e58cf356d6429759dfa46",
+      "blockhash": "21bcade91ede54671826448840b2fa3a488ab56444aee71d4cd79c8357651244",
       "feerate_percentiles": [
         20,
         20,
diff --git a/test/functional/test_framework/test_framework.py b/test/functional/test_framework/test_framework.py
index 9aff08fdc7dae..e21afc3d19ed1 100755
--- a/test/functional/test_framework/test_framework.py
+++ b/test/functional/test_framework/test_framework.py
@@ -91,7 +91,7 @@ class BitcoinTestFramework(metaclass=BitcoinTestMetaClass):
 
     def __init__(self):
         """Sets test framework defaults. Do not override this method. Instead, override the set_test_params() method"""
-        self.chain = 'regtest'
+        self.chain = 'regtest2'
         self.setup_clean_chain = False
         self.nodes = []
         self.network_thread = None

From 40436e67921dec474015f621c2db35e1cfbcfb54 Mon Sep 17 00:00:00 2001
From: Karl-Johan Alm <karljohan-alm@garage.co.jp>
Date: Wed, 17 Jul 2019 17:33:25 +0900
Subject: [PATCH 07/31] add witness commitment section support to
 primitive/block

This also moves GetWitnessCommitmentIndex out of validation.cpp into CBlock, with 3 lines affected (GetWitnessCommitmentIndex(block) -> block.GetWitnessCommitmentIndex()).
---
 src/primitives/block.cpp | 62 ++++++++++++++++++++++++++++++++++++++++
 src/primitives/block.h   | 44 ++++++++++++++++++++++++++++
 src/validation.cpp       | 21 ++------------
 3 files changed, 109 insertions(+), 18 deletions(-)

diff --git a/src/primitives/block.cpp b/src/primitives/block.cpp
index 60c7c2d16083e..b41b90612d9dc 100644
--- a/src/primitives/block.cpp
+++ b/src/primitives/block.cpp
@@ -29,3 +29,65 @@ std::string CBlock::ToString() const
     }
     return s.str();
 }
+
+bool CBlock::GetWitnessCommitmentSection(const uint8_t header[4], std::vector<uint8_t>& result) const
+{
+    int cidx = GetWitnessCommitmentIndex();
+    if (cidx == -1) return false;
+    auto script = vtx.at(0)->vout.at(cidx).scriptPubKey;
+    opcodetype opcode;
+    CScript::const_iterator pc = script.begin();
+    ++pc; // move beyond initial OP_RETURN
+    while (script.GetOp(pc, opcode, result)) {
+        if (result.size() > 3 && !memcmp(result.data(), header, 4)) {
+            result.erase(result.begin(), result.begin() + 4);
+            return true;
+        }
+    }
+    result.clear();
+    return false;
+}
+
+bool CBlock::SetWitnessCommitmentSection(CMutableTransaction& mtx, const uint8_t header[4], const std::vector<uint8_t> data)
+{
+    int cidx = GetWitnessCommitmentIndex(mtx);
+    if (cidx == -1) return false;
+
+    CScript result;
+    std::vector<uint8_t> pushdata;
+    auto script = mtx.vout[cidx].scriptPubKey;
+    opcodetype opcode;
+    CScript::const_iterator pc = script.begin();
+    result.push_back(*pc++);
+    bool found = false;
+    while (script.GetOp(pc, opcode, pushdata)) {
+        if (pushdata.size() > 0) {
+            if (pushdata.size() > 3 && !memcmp(pushdata.data(), header, 4)) {
+                // replace pushdata
+                found = true;
+                pushdata.erase(pushdata.begin() + 4, pushdata.end());
+                pushdata.insert(pushdata.end(), data.begin(), data.end());
+            }
+            result << pushdata;
+        } else {
+            result << opcode;
+        }
+    }
+    if (!found) {
+        // append section as it did not exist
+        pushdata.clear();
+        pushdata.insert(pushdata.end(), header, header + 4);
+        pushdata.insert(pushdata.end(), data.begin(), data.end());
+        result << pushdata;
+    }
+    mtx.vout[cidx].scriptPubKey = result;
+    return true;
+}
+
+bool CBlock::SetWitnessCommitmentSection(const uint8_t header[4], const std::vector<uint8_t> data)
+{
+    auto mtx = CMutableTransaction(*vtx[0]);
+    if (!SetWitnessCommitmentSection(mtx, header, data)) return false;
+    vtx[0] = std::make_shared<CTransaction>(mtx);
+    return true;
+}
diff --git a/src/primitives/block.h b/src/primitives/block.h
index 750d42efbc236..db6c9be4185c3 100644
--- a/src/primitives/block.h
+++ b/src/primitives/block.h
@@ -116,6 +116,50 @@ class CBlock : public CBlockHeader
         return block;
     }
 
+    /**
+     * Get the vout index of the segwit commitment in the coinbase transaction of this block.
+     *
+     * Returns -1 if no witness commitment was found.
+     */
+    inline int GetWitnessCommitmentIndex() const
+    {
+        return vtx.empty() ? -1 : GetWitnessCommitmentIndex(*vtx.at(0));
+    }
+
+    /**
+     * Get the vout index of the segwit commitment in the given coinbase transaction.
+     *
+     * Returns -1 if no witness commitment was found.
+     */
+    template<typename T> static inline int GetWitnessCommitmentIndex(const T& coinbase) {
+        for (int64_t o = coinbase.vout.size() - 1; o > -1; --o) {
+            auto vospk = coinbase.vout[o].scriptPubKey;
+            if (vospk.size() >= 38 && vospk[0] == OP_RETURN && vospk[1] == 0x24 && vospk[2] == 0xaa && vospk[3] == 0x21 && vospk[4] == 0xa9 && vospk[5] == 0xed) {
+                return o;
+            }
+        }
+        return -1;
+    }
+
+    /**
+     * Attempt to get the data for the section with the given header in the witness commitment of this block.
+     *
+     * Returns false if header was not found. The data (excluding the 4 byte header) is written into result if found.
+     */
+    bool GetWitnessCommitmentSection(const uint8_t header[4], std::vector<uint8_t>& result) const;
+
+    /**
+     * Attempt to add or update the data for the section with the given header in the witness commitment of this block.
+     *
+     * This operation may fail and return false, if no witness commitment exists upon call time. Returns true on success.
+     */
+    bool SetWitnessCommitmentSection(const uint8_t header[4], const std::vector<uint8_t> data);
+
+    /**
+     * The tx based equivalent of the above.
+     */
+    static bool SetWitnessCommitmentSection(CMutableTransaction& tx, const uint8_t header[4], const std::vector<uint8_t> data);
+
     std::string ToString() const;
 };
 
diff --git a/src/validation.cpp b/src/validation.cpp
index 772e0fd67199a..dac197c812693 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -3135,24 +3135,9 @@ bool IsWitnessEnabled(const CBlockIndex* pindexPrev, const Consensus::Params& pa
     return (height >= params.SegwitHeight);
 }
 
-// Compute at which vout of the block's coinbase transaction the witness
-// commitment occurs, or -1 if not found.
-static int GetWitnessCommitmentIndex(const CBlock& block)
-{
-    int commitpos = -1;
-    if (!block.vtx.empty()) {
-        for (size_t o = 0; o < block.vtx[0]->vout.size(); o++) {
-            if (block.vtx[0]->vout[o].scriptPubKey.size() >= 38 && block.vtx[0]->vout[o].scriptPubKey[0] == OP_RETURN && block.vtx[0]->vout[o].scriptPubKey[1] == 0x24 && block.vtx[0]->vout[o].scriptPubKey[2] == 0xaa && block.vtx[0]->vout[o].scriptPubKey[3] == 0x21 && block.vtx[0]->vout[o].scriptPubKey[4] == 0xa9 && block.vtx[0]->vout[o].scriptPubKey[5] == 0xed) {
-                commitpos = o;
-            }
-        }
-    }
-    return commitpos;
-}
-
 void UpdateUncommittedBlockStructures(CBlock& block, const CBlockIndex* pindexPrev, const Consensus::Params& consensusParams)
 {
-    int commitpos = GetWitnessCommitmentIndex(block);
+    int commitpos = block.GetWitnessCommitmentIndex();
     static const std::vector<unsigned char> nonce(32, 0x00);
     if (commitpos != -1 && IsWitnessEnabled(pindexPrev, consensusParams) && !block.vtx[0]->HasWitness()) {
         CMutableTransaction tx(*block.vtx[0]);
@@ -3165,7 +3150,7 @@ void UpdateUncommittedBlockStructures(CBlock& block, const CBlockIndex* pindexPr
 std::vector<unsigned char> GenerateCoinbaseCommitment(CBlock& block, const CBlockIndex* pindexPrev, const Consensus::Params& consensusParams)
 {
     std::vector<unsigned char> commitment;
-    int commitpos = GetWitnessCommitmentIndex(block);
+    int commitpos = block.GetWitnessCommitmentIndex();
     std::vector<unsigned char> ret(32, 0x00);
     if (consensusParams.SegwitHeight != std::numeric_limits<int>::max()) {
         if (commitpos == -1) {
@@ -3303,7 +3288,7 @@ static bool ContextualCheckBlock(const CBlock& block, CValidationState& state, c
     //   multiple, the last one is used.
     bool fHaveWitness = false;
     if (nHeight >= consensusParams.SegwitHeight) {
-        int commitpos = GetWitnessCommitmentIndex(block);
+        int commitpos = block.GetWitnessCommitmentIndex();
         if (commitpos != -1) {
             bool malleated = false;
             uint256 hashWitness = BlockWitnessMerkleRoot(block, &malleated);

From 0431724a6f0e34627998b2c41a37f40295e5e2b8 Mon Sep 17 00:00:00 2001
From: Karl-Johan Alm <karljohan-alm@garage.co.jp>
Date: Wed, 17 Jul 2019 17:38:43 +0900
Subject: [PATCH 08/31] add simple signature support (checker/creator)

The simple signature takes a sighash as argument and verifies a signature and pubkey against it. It is used in signet for verifying blocks, but can be used for practically anything.
---
 src/script/interpreter.cpp | 14 ++++++++++++++
 src/script/interpreter.h   | 12 ++++++++++++
 src/script/sign.cpp        |  9 +++++++++
 src/script/sign.h          | 11 +++++++++++
 4 files changed, 46 insertions(+)

diff --git a/src/script/interpreter.cpp b/src/script/interpreter.cpp
index f8701b6d01a6d..d7af9841d8c45 100644
--- a/src/script/interpreter.cpp
+++ b/src/script/interpreter.cpp
@@ -1416,6 +1416,20 @@ bool GenericTransactionSignatureChecker<T>::CheckSequence(const CScriptNum& nSeq
 template class GenericTransactionSignatureChecker<CTransaction>;
 template class GenericTransactionSignatureChecker<CMutableTransaction>;
 
+bool SimpleSignatureChecker::CheckSig(const std::vector<unsigned char>& vchSigIn, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode, SigVersion sigversion) const
+{
+    CPubKey pubkey(vchPubKey);
+    if (!pubkey.IsValid()) return false;
+
+    // Hash type is one byte tacked on to the end of the signature
+    std::vector<unsigned char> vchSig(vchSigIn);
+    if (vchSig.empty()) return false;
+    // int nHashType = vchSig.back();
+    vchSig.pop_back();
+
+    return pubkey.Verify(hash, vchSig);
+}
+
 static bool VerifyWitnessProgram(const CScriptWitness& witness, int witversion, const std::vector<unsigned char>& program, unsigned int flags, const BaseSignatureChecker& checker, ScriptError* serror)
 {
     std::vector<std::vector<unsigned char> > stack;
diff --git a/src/script/interpreter.h b/src/script/interpreter.h
index 276ff9a58a870..d49c955d50f87 100644
--- a/src/script/interpreter.h
+++ b/src/script/interpreter.h
@@ -162,6 +162,18 @@ class BaseSignatureChecker
     virtual ~BaseSignatureChecker() {}
 };
 
+/** A general purpose signature checker. */
+class SimpleSignatureChecker : public BaseSignatureChecker
+{
+private:
+    uint256 hash;
+
+public:
+    const uint256& GetHash() const { return hash; }
+    explicit SimpleSignatureChecker(const uint256& hash_in) : hash(hash_in) {}
+    bool CheckSig(const std::vector<unsigned char>& scriptSig, const std::vector<unsigned char>& vchPubKey, const CScript& scriptCode, SigVersion sigversion) const override;
+};
+
 template <class T>
 class GenericTransactionSignatureChecker : public BaseSignatureChecker
 {
diff --git a/src/script/sign.cpp b/src/script/sign.cpp
index 13481af9c5063..a356c13908a39 100644
--- a/src/script/sign.cpp
+++ b/src/script/sign.cpp
@@ -33,6 +33,15 @@ bool MutableTransactionSignatureCreator::CreateSig(const SigningProvider& provid
     return true;
 }
 
+bool SimpleSignatureCreator::CreateSig(const SigningProvider& provider, std::vector<unsigned char>& vchSig, const CKeyID& keyid, const CScript& scriptCode, SigVersion sigversion) const
+{
+    CKey key;
+    if (!provider.GetKey(keyid, key)) return false;
+    if (!key.Sign(checker.GetHash(), vchSig)) return false;
+    vchSig.push_back((unsigned char)SIGHASH_ALL);
+    return true;
+}
+
 static bool GetCScript(const SigningProvider& provider, const SignatureData& sigdata, const CScriptID& scriptid, CScript& script)
 {
     if (provider.GetCScript(scriptid, script)) {
diff --git a/src/script/sign.h b/src/script/sign.h
index 0e751afd3ba5e..6de734a8c2047 100644
--- a/src/script/sign.h
+++ b/src/script/sign.h
@@ -32,6 +32,17 @@ class BaseSignatureCreator {
     virtual bool CreateSig(const SigningProvider& provider, std::vector<unsigned char>& vchSig, const CKeyID& keyid, const CScript& scriptCode, SigVersion sigversion) const =0;
 };
 
+/** A general purpose signature creator. */
+class SimpleSignatureCreator : public BaseSignatureCreator
+{
+    SimpleSignatureChecker checker;
+
+public:
+    explicit SimpleSignatureCreator(const uint256& hashIn) : BaseSignatureCreator(), checker(hashIn) {};
+    const BaseSignatureChecker& Checker() const override { return checker; }
+    bool CreateSig(const SigningProvider& provider, std::vector<unsigned char>& vchSig, const CKeyID& keyid, const CScript& scriptCode, SigVersion sigversion) const override;
+};
+
 /** A signature creator for transactions. */
 class MutableTransactionSignatureCreator : public BaseSignatureCreator {
     const CMutableTransaction* txTo;

From 56f407b7f3c0301d3631c9042bfa85d2195d63ed Mon Sep 17 00:00:00 2001
From: Karl-Johan Alm <karljohan-alm@garage.co.jp>
Date: Wed, 17 Jul 2019 17:41:32 +0900
Subject: [PATCH 09/31] add signet basic support (signet.cpp)

---
 src/Makefile.am        |  2 ++
 src/consensus/params.h |  6 +++++
 src/signet.cpp         | 57 ++++++++++++++++++++++++++++++++++++++++++
 src/signet.h           | 43 +++++++++++++++++++++++++++++++
 4 files changed, 108 insertions(+)
 create mode 100644 src/signet.cpp
 create mode 100644 src/signet.h

diff --git a/src/Makefile.am b/src/Makefile.am
index 8fc7f61d4b78e..0175b93e03626 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -189,6 +189,7 @@ BITCOIN_CORE_H = \
   script/signingprovider.h \
   script/standard.h \
   shutdown.h \
+  signet.h \
   streams.h \
   support/allocators/secure.h \
   support/allocators/zeroafterfree.h \
@@ -471,6 +472,7 @@ libbitcoin_common_a_SOURCES = \
   script/sign.cpp \
   script/signingprovider.cpp \
   script/standard.cpp \
+  signet.cpp \
   versionbitsinfo.cpp \
   warnings.cpp \
   $(BITCOIN_CORE_H)
diff --git a/src/consensus/params.h b/src/consensus/params.h
index 8263b0fef4a89..a9da0bba133be 100644
--- a/src/consensus/params.h
+++ b/src/consensus/params.h
@@ -79,6 +79,12 @@ struct Params {
     int64_t DifficultyAdjustmentInterval() const { return nPowTargetTimespan / nPowTargetSpacing; }
     uint256 nMinimumChainWork;
     uint256 defaultAssumeValid;
+
+    /**
+     * If true, witness commitments contain a payload equal to a Bitcoin Script solution
+     * to a signet challenge as defined in the chain params.
+     */
+    bool signet_blocks{false};
 };
 } // namespace Consensus
 
diff --git a/src/signet.cpp b/src/signet.cpp
new file mode 100644
index 0000000000000..e6b8d32186cde
--- /dev/null
+++ b/src/signet.cpp
@@ -0,0 +1,57 @@
+// Copyright (c) 2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <signet.h>
+
+#include <consensus/merkle.h>
+#include <consensus/params.h>
+#include <hash.h>
+#include <primitives/block.h>
+#include <script/interpreter.h>
+#include <script/standard.h>        // MANDATORY_SCRIPT_VERIFY_FLAGS
+#include <util/system.h>
+
+CScript g_signet_blockscript;
+
+// Signet block solution checker
+bool CheckBlockSolution(const CBlock& block, const Consensus::Params& consensusParams)
+{
+    std::vector<uint8_t> signet_data;
+    if (!block.GetWitnessCommitmentSection(SIGNET_HEADER, signet_data)) {
+        return error("CheckBlockSolution: Errors in block (block solution missing)");
+    }
+    if (!CheckBlockSolution(GetSignetHash(block), signet_data, consensusParams)) {
+        return error("CheckBlockSolution: Errors in block (block solution invalid)");
+    }
+    return true;
+}
+
+bool CheckBlockSolution(const uint256& signet_hash, const std::vector<uint8_t>& signature, const Consensus::Params& params)
+{
+    SimpleSignatureChecker bsc(signet_hash);
+    CScript solution = CScript(signature.begin(), signature.end());
+    return VerifyScript(solution, g_signet_blockscript, nullptr, MANDATORY_SCRIPT_VERIFY_FLAGS, bsc);
+}
+
+uint256 BlockSignetMerkleRoot(const CBlock& block, bool* mutated = nullptr)
+{
+    std::vector<uint256> leaves;
+    leaves.resize(block.vtx.size());
+    {
+        // find and delete signet signature
+        CMutableTransaction mtx(*block.vtx.at(0));
+        CBlock::SetWitnessCommitmentSection(mtx, SIGNET_HEADER, std::vector<uint8_t>{});
+        leaves[0] = mtx.GetHash();
+    }
+    for (size_t s = 1; s < block.vtx.size(); s++) {
+        leaves[s] = block.vtx[s]->GetHash();
+    }
+    return ComputeMerkleRoot(std::move(leaves), mutated);
+}
+
+uint256 GetSignetHash(const CBlock& block)
+{
+    if (block.vtx.size() == 0) return block.GetHash();
+    return (CHashWriter(SER_DISK, PROTOCOL_VERSION) << block.nVersion << block.hashPrevBlock << BlockSignetMerkleRoot(block) << block.nTime << block.nBits).GetHash();
+}
diff --git a/src/signet.h b/src/signet.h
new file mode 100644
index 0000000000000..b1945dab46dda
--- /dev/null
+++ b/src/signet.h
@@ -0,0 +1,43 @@
+// Copyright (c) 2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_SIGNET_H
+#define BITCOIN_SIGNET_H
+
+#if defined(HAVE_CONFIG_H)
+#include <config/bitcoin-config.h>
+#endif
+
+#include <consensus/params.h>
+
+#include <stdint.h>
+
+class CBlock;
+class uint256;
+class CScript;
+
+extern CScript g_signet_blockscript;
+
+constexpr uint8_t SIGNET_HEADER[4] = {0xec, 0xc7, 0xda, 0xa2};
+
+/**
+ * Check whether a block has a valid solution
+ */
+bool CheckBlockSolution(const uint256& signet_hash, const std::vector<uint8_t>& signature, const Consensus::Params&);
+
+/**
+ * Extract signature and check whether a block has a valid solution
+ */
+bool CheckBlockSolution(const CBlock& block, const Consensus::Params& consensusParams);
+
+/**
+ * Generate the signet hash for the given block
+ *
+ * The signet hash differs from the regular block hash in two places:
+ * 1. It hashes the witness root instead of the merkle root.
+ * 2. It skips the nonce.
+ */
+uint256 GetSignetHash(const CBlock& block);
+
+#endif // BITCOIN_SIGNET_H

From 72b7bac01decf3b4e2c1e874062cef014709f3fd Mon Sep 17 00:00:00 2001
From: Karl-Johan Alm <karljohan-alm@garage.co.jp>
Date: Mon, 19 Aug 2019 11:56:55 +0900
Subject: [PATCH 10/31] add signet chain and accompanying parameters

---
 src/chainparams.cpp     | 103 ++++++++++++++++++++++++++++++++++++++++
 src/chainparams.h       |   5 ++
 src/chainparamsbase.cpp |   8 ++++
 src/chainparamsbase.h   |   3 +-
 src/util/system.cpp     |  12 +++--
 5 files changed, 126 insertions(+), 5 deletions(-)

diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index de4ada8a280c5..663643b0531df 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -8,6 +8,7 @@
 #include <chainparamsseeds.h>
 #include <consensus/merkle.h>
 #include <hash.h>
+#include <signet.h>
 #include <tinyformat.h>
 #include <util/system.h>
 #include <util/strencodings.h>
@@ -39,6 +40,12 @@ static CBlock CreateGenesisBlock(const CScript& coinbase_sig, const CScript& gen
     return genesis;
 }
 
+static CBlock CreateGenesisBlock(const char* pszTimestamp, const CScript& genesisOutputScript, uint32_t nTime, uint32_t nNonce, uint32_t nBits, int32_t nVersion, const CAmount& genesisReward)
+{
+    CScript coinbase_sig = CScript() << 486604799 << CScriptNum(4) << std::vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
+    return CreateGenesisBlock(coinbase_sig, genesisOutputScript, nTime, nNonce, nBits, nVersion, genesisReward);
+}
+
 /**
  * Build the genesis block. Note that the output of its generation
  * transaction cannot be spent since it did not originally exist in the
@@ -255,6 +262,89 @@ class CTestNetParams : public CChainParams {
     }
 };
 
+/**
+ * SigNet
+ */
+class SigNetParams : public CChainParams {
+public:
+    SigNetParams(const ArgsManager& args) {
+        std::vector<uint8_t> bin;
+        vSeeds.clear();
+        uint32_t genesis_nonce = 0;
+
+        if (!args.IsArgSet("-signet_blockscript")) {
+            throw std::runtime_error(strprintf("%s: -signet_blockscript is mandatory for signet networks", __func__));
+        }
+        if (args.GetArgs("-signet_blockscript").size() != 1) {
+            throw std::runtime_error(strprintf("%s: -signet_blockscript cannot be multiple values.", __func__));
+        }
+        bin = ParseHex(args.GetArgs("-signet_blockscript")[0]);
+        if (args.IsArgSet("-signet_genesisnonce")) {
+            genesis_nonce = args.GetArg("-signet_genesisnonce", 0);
+        }
+        if (args.IsArgSet("-signet_seednode")) {
+            vSeeds = gArgs.GetArgs("-signet_seednode");
+        }
+
+        LogPrintf("SigNet with block script %s\n", gArgs.GetArgs("-signet_blockscript")[0]);
+
+        strNetworkID = "signet";
+        consensus.signet_blocks = true;
+        g_signet_blockscript = CScript(bin.begin(), bin.end());
+        consensus.nSubsidyHalvingInterval = 210000;
+        consensus.BIP34Height = 1;
+        consensus.BIP65Height = 1;
+        consensus.BIP66Height = 1;
+        consensus.CSVHeight = 0;
+        consensus.SegwitHeight = 0;
+        consensus.nPowTargetTimespan = 14 * 24 * 60 * 60; // two weeks
+        consensus.nPowTargetSpacing = 10 * 60;
+        consensus.fPowAllowMinDifficultyBlocks = false;
+        consensus.fPowNoRetargeting = false;
+        consensus.nRuleChangeActivationThreshold = 1916;
+        consensus.nMinerConfirmationWindow = 2016;
+        consensus.powLimit = uint256S("00002adc28cf53b63c82faa55d83e40ac63b5f100aa5d8df62a429192f9e8ce5");
+        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;
+        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nStartTime = 1539478800;
+        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
+
+        pchMessageStart[0] = 0xf0;
+        pchMessageStart[1] = 0xc7;
+        pchMessageStart[2] = 0x70;
+        pchMessageStart[3] = 0x6a;
+        nDefaultPort = 38333;
+        nPruneAfterHeight = 1000;
+
+        genesis = CreateSignetGenesisBlock(g_signet_blockscript, genesis_nonce);
+        consensus.hashGenesisBlock = genesis.GetHash();
+
+        // Now that genesis block has been generated, we check if there is an enforcescript, and switch
+        // to that one, as we will not be using the real block script anymore
+        if (args.IsArgSet("-signet_enforcescript")) {
+            if (args.GetArgs("-signet_enforcescript").size() != 1) {
+                throw std::runtime_error(strprintf("%s: -signet_enforcescript cannot be multiple values.", __func__));
+            }
+            bin = ParseHex(args.GetArgs("-signet_enforcescript")[0]);
+            g_signet_blockscript = CScript(bin.begin(), bin.end());
+            LogPrintf("SigNet enforce script %s\n", gArgs.GetArgs("-signet_enforcescript")[0]);
+        }
+
+        vFixedSeeds.clear();
+
+        base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>{125};
+        base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>{87};
+        base58Prefixes[SECRET_KEY] =     std::vector<unsigned char>{217};
+        base58Prefixes[EXT_PUBLIC_KEY] = {0x04, 0x35, 0x87, 0xCF};
+        base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x35, 0x83, 0x94};
+
+        bech32_hrp = "sb";
+
+        fDefaultConsistencyChecks = false;
+        fRequireStandard = true;
+        m_is_test_chain = true;
+    }
+};
+
 /**
  * Regression test
  */
@@ -474,6 +564,9 @@ std::unique_ptr<const CChainParams> CreateChainParams(const std::string& chain)
         return std::unique_ptr<CChainParams>(new CTestNetParams());
     else if (chain == CBaseChainParams::REGTEST)
         return std::unique_ptr<CChainParams>(new CRegTestParams(gArgs));
+    else if (chain == CBaseChainParams::SIGNET) {
+        return std::unique_ptr<CChainParams>(new SigNetParams(gArgs));
+    }
 
     return std::unique_ptr<CChainParams>(new CCustomParams(chain, gArgs));
 }
@@ -483,3 +576,13 @@ void SelectParams(const std::string& network)
     SelectBaseParams(network);
     globalChainParams = CreateChainParams(network);
 }
+
+CBlock CreateSignetGenesisBlock(const CScript& block_script, uint32_t block_nonce)
+{
+    CHashWriter h(SER_DISK, 0);
+    h << block_script;
+    uint256 hash = h.GetHash();
+    CScript coinbase_sig = CScript() << std::vector<uint8_t>(hash.begin(), hash.end());
+    CScript genesis_out = CScript() << OP_RETURN;
+    return CreateGenesisBlock(coinbase_sig, genesis_out, 1534313275, block_nonce, 0x1e2adc28, 1, 50 * COIN);
+}
diff --git a/src/chainparams.h b/src/chainparams.h
index 8f1d27e03cd95..aa87de345781d 100644
--- a/src/chainparams.h
+++ b/src/chainparams.h
@@ -125,4 +125,9 @@ const CChainParams &Params();
  */
 void SelectParams(const std::string& chain);
 
+/**
+ * Create a Signet genesis block for the given block script/nonce.
+ */
+CBlock CreateSignetGenesisBlock(const CScript& block_script, uint32_t block_nonce=0);
+
 #endif // BITCOIN_CHAINPARAMS_H
diff --git a/src/chainparamsbase.cpp b/src/chainparamsbase.cpp
index 5bf0ed78a2cd2..7fdae8b6079b0 100644
--- a/src/chainparamsbase.cpp
+++ b/src/chainparamsbase.cpp
@@ -13,6 +13,7 @@
 
 const std::string CBaseChainParams::MAIN = "main";
 const std::string CBaseChainParams::TESTNET = "test";
+const std::string CBaseChainParams::SIGNET = "signet";
 const std::string CBaseChainParams::REGTEST = "regtest";
 
 void SetupChainParamsBaseOptions()
@@ -21,6 +22,11 @@ void SetupChainParamsBaseOptions()
     gArgs.AddArg("-regtest", "Enter regression test mode, which uses a special chain in which blocks can be solved instantly. "
                  "This is intended for regression testing tools and app development. Equivalent to -chain=regtest.", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
     gArgs.AddArg("-testnet", "Use the test chain. Equivalent to -chain=test.", ArgsManager::ALLOW_ANY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-signet", "Use the signet chain. Note that the network is defined by the signet_blockscript parameter", ArgsManager::ALLOW_ANY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-signet_blockscript", "Blocks must satisfy the given script to be considered valid (only for -signet networks)", ArgsManager::ALLOW_STRING, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-signet_genesisnonce", "Nonce value for use in genesis block to satisfy proof of work requirement", ArgsManager::ALLOW_INT, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-signet_enforcescript", "Blocks must satisfy the given script to be considered valid (this replaces -signet_blockscript, and is used for opt-in-reorg mode)", ArgsManager::ALLOW_STRING, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-signet_seednode", "Specify a seed node for the signet network (may be used multiple times to specify multiple seed nodes)", ArgsManager::ALLOW_STRING, OptionsCategory::CHAINPARAMS);
     gArgs.AddArg("-vbparams=deployment:start:end", "Use given start/end times for specified version bits deployment (regtest or custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
     gArgs.AddArg("-segwitheight=<n>", "Set the activation height of segwit. -1 to disable. (regtest or custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-con_nsubsidyhalvinginterval", "Number of blocks between one subsidy adjustment and the next one. Default: 150 (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
@@ -71,6 +77,8 @@ std::unique_ptr<CBaseChainParams> CreateBaseChainParams(const std::string& chain
         return MakeUnique<CBaseChainParams>("testnet3", 18332);
     else if (chain == CBaseChainParams::REGTEST)
         return MakeUnique<CBaseChainParams>("regtest", 18443);
+    else if (chain == CBaseChainParams::SIGNET)
+        return MakeUnique<CBaseChainParams>("signet", 38332);
 
     return MakeUnique<CBaseChainParams>(chain, 18553);
 }
diff --git a/src/chainparamsbase.h b/src/chainparamsbase.h
index f34646f7acf1f..1256ad1107e22 100644
--- a/src/chainparamsbase.h
+++ b/src/chainparamsbase.h
@@ -15,9 +15,10 @@
 class CBaseChainParams
 {
 public:
-    /** BIP70 chain name strings (main, test or regtest) */
+    /** BIP70 chain name strings (main, test, signet or regtest) */
     static const std::string MAIN;
     static const std::string TESTNET;
+    static const std::string SIGNET;
     static const std::string REGTEST;
 
     const std::string& DataDir() const { return strDataDir; }
diff --git a/src/util/system.cpp b/src/util/system.cpp
index 00db76325eac6..ef78c6779421e 100644
--- a/src/util/system.cpp
+++ b/src/util/system.cpp
@@ -939,17 +939,21 @@ bool ArgsManager::ReadConfigFiles(std::string& error, bool ignore_invalid_keys)
 std::string ArgsManager::GetChainName() const
 {
     LOCK(cs_args);
-    const bool fRegTest = ArgsManagerHelper::GetNetBoolArg(*this, "-regtest");
-    const bool fTestNet = ArgsManagerHelper::GetNetBoolArg(*this, "-testnet");
+    bool fRegTest = ArgsManagerHelper::GetNetBoolArg(*this, "-regtest");
+    bool fTestNet = ArgsManagerHelper::GetNetBoolArg(*this, "-testnet");
+    bool signet   = ArgsManagerHelper::GetNetBoolArg(*this, "-signet");
     const bool is_chain_arg_set = IsArgSet("-chain");
 
-    if ((int)is_chain_arg_set + (int)fRegTest + (int)fTestNet > 1) {
-        throw std::runtime_error("Invalid combination of -regtest, -testnet and -chain. Can use at most one.");
+    if ((int)is_chain_arg_set + (int)fTestNet + (int)fRegTest + (int)signet > 1) {
+        throw std::runtime_error("Invalid combination of -regtest, -testnet, -signet and -chain. Can use at most one");
     }
     if (fRegTest)
         return CBaseChainParams::REGTEST;
     if (fTestNet)
         return CBaseChainParams::TESTNET;
+    if (signet) {
+        return CBaseChainParams::SIGNET;
+    }
     return GetArg("-chain", CBaseChainParams::MAIN);
 }
 

From 1dade0d3954df2cd9ed6ea6aad59c97c53b0739b Mon Sep 17 00:00:00 2001
From: Karl-Johan Alm <karljohan-alm@garage.co.jp>
Date: Wed, 17 Jul 2019 17:55:13 +0900
Subject: [PATCH 11/31] qt: update QT to support signet network

---
 src/qt/guiconstants.h   | 1 +
 src/qt/networkstyle.cpp | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/qt/guiconstants.h b/src/qt/guiconstants.h
index fc27aef6617a7..a0066e26f7bd1 100644
--- a/src/qt/guiconstants.h
+++ b/src/qt/guiconstants.h
@@ -47,6 +47,7 @@ static const int TOOLTIP_WRAP_THRESHOLD = 80;
 #define QAPP_APP_NAME_DEFAULT "Bitcoin-Qt"
 #define QAPP_APP_NAME_TESTNET "Bitcoin-Qt-testnet"
 #define QAPP_APP_NAME_REGTEST "Bitcoin-Qt-regtest"
+#define QAPP_APP_NAME_SIGNET "Bitcoin-Qt-signet"
 #define QAPP_APP_NAME_CUSTOM "Bitcoin-Qt-custom-chain"
 
 /* One gigabyte (GB) in bytes */
diff --git a/src/qt/networkstyle.cpp b/src/qt/networkstyle.cpp
index dcb405b5d9c82..d48c4271b8142 100644
--- a/src/qt/networkstyle.cpp
+++ b/src/qt/networkstyle.cpp
@@ -19,7 +19,8 @@ static const struct {
 } network_styles[] = {
     {"main", QAPP_APP_NAME_DEFAULT, 0, 0},
     {"test", QAPP_APP_NAME_TESTNET, 70, 30},
-    {"regtest", QAPP_APP_NAME_REGTEST, 160, 30}
+    {"regtest", QAPP_APP_NAME_REGTEST, 160, 30},
+    {"signet", QAPP_APP_NAME_SIGNET, 35, 15},
 };
 static const unsigned network_styles_count = sizeof(network_styles)/sizeof(*network_styles);
 

From 2c22b41bc1f9d753d26c206b34be4a05466a2566 Mon Sep 17 00:00:00 2001
From: Karl-Johan Alm <karljohan-alm@garage.co.jp>
Date: Wed, 17 Jul 2019 18:40:34 +0900
Subject: [PATCH 12/31] consensus: add signet validation

---
 src/validation.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/validation.cpp b/src/validation.cpp
index dac197c812693..8e0427db313dc 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -30,6 +30,7 @@
 #include <script/sigcache.h>
 #include <script/standard.h>
 #include <shutdown.h>
+#include <signet.h>
 #include <timedata.h>
 #include <tinyformat.h>
 #include <txdb.h>
@@ -1015,6 +1016,11 @@ bool ReadBlockFromDisk(CBlock& block, const FlatFilePos& pos, const Consensus::P
         return error("ReadBlockFromDisk: Errors in block header at %s", pos.ToString());
     }
 
+    if (consensusParams.signet_blocks && block.GetHash() != consensusParams.hashGenesisBlock && !CheckBlockSolution(block, consensusParams)) {
+        /* CheckBlockSolution() calls error(..) */
+        return false;
+    }
+
     return true;
 }
 
@@ -3078,6 +3084,10 @@ bool CheckBlock(const CBlock& block, CValidationState& state, const Consensus::P
     if (!CheckBlockHeader(block, state, consensusParams, fCheckPOW))
         return false;
 
+    if (consensusParams.signet_blocks && fCheckPOW && block.GetHash() != consensusParams.hashGenesisBlock && !CheckBlockSolution(block, consensusParams)) {
+        return false;
+    }
+
     // Check the merkle root.
     if (fCheckMerkleRoot) {
         bool mutated;

From 752d2e614f54ad1f8857380773b6aa8c1df65b75 Mon Sep 17 00:00:00 2001
From: Karl-Johan Alm <karljohan-alm@garage.co.jp>
Date: Thu, 18 Jul 2019 13:42:31 +0900
Subject: [PATCH 13/31] i/o: make DecodeHexBlk able to read block hex from file

---
 src/core_read.cpp | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/core_read.cpp b/src/core_read.cpp
index a3c9cf0159b38..de6c751789f7f 100644
--- a/src/core_read.cpp
+++ b/src/core_read.cpp
@@ -158,10 +158,27 @@ bool DecodeHexBlockHeader(CBlockHeader& header, const std::string& hex_header)
     return true;
 }
 
+inline bool ReadFromDisk(const std::string& path, std::string& output)
+{
+    FILE* fp = fopen(path.c_str(), "rb");
+    if (!fp) return false;
+    char buf[1025];
+    size_t r;
+    buf[1024] = 0;
+    output = "";
+    while (0 < (r = fread(buf, 1, 1024, fp))) { buf[r] = 0; output += buf; }
+    while (output.size() > 0 && output[output.size() - 1] == '\n') output = output.substr(0, output.size() - 1);
+    fclose(fp);
+    return true;
+}
+
 bool DecodeHexBlk(CBlock& block, const std::string& strHexBlk)
 {
-    if (!IsHex(strHexBlk))
+    if (!IsHex(strHexBlk)) {
+        std::string actual;
+        if (ReadFromDisk(strHexBlk, actual)) return DecodeHexBlk(block, actual);
         return false;
+    }
 
     std::vector<unsigned char> blockData(ParseHex(strHexBlk));
     CDataStream ssBlock(blockData, SER_NETWORK, PROTOCOL_VERSION);

From 2125aa92169bff41130e74343730a5beaf7ee354 Mon Sep 17 00:00:00 2001
From: Karl-Johan Alm <karljohan-alm@garage.co.jp>
Date: Thu, 18 Jul 2019 12:25:47 +0900
Subject: [PATCH 14/31] rpc: add getnewblockhex command for obtaining an
 unsigned block

---
 src/rpc/mining.cpp | 54 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp
index 07c2958635be6..dde5168c81d2d 100644
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -20,6 +20,7 @@
 #include <rpc/util.h>
 #include <script/script.h>
 #include <shutdown.h>
+#include <signet.h>
 #include <txmempool.h>
 #include <univalue.h>
 #include <util/fees.h>
@@ -171,6 +172,10 @@ static UniValue generatetoaddress(const JSONRPCRequest& request)
         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Error: Invalid address");
     }
 
+    if (Params().GetConsensus().signet_blocks) {
+        throw JSONRPCError(RPC_INVALID_PARAMETER, "Generating signet blocks require that you use getnewblockhex");
+    }
+
     CScript coinbase_script = GetScriptForDestination(destination);
 
     return generateBlocks(coinbase_script, nGenerate, nMaxTries);
@@ -948,6 +953,52 @@ static UniValue estimaterawfee(const JSONRPCRequest& request)
     return result;
 }
 
+//
+// signet
+//
+
+UniValue getnewblockhex(const JSONRPCRequest& request)
+{
+    RPCHelpMan{"getnewblockhex",
+        "\nGets hex representation of a proposed, unmined new signet block.\n",
+        {
+            {"coinbase_destination", RPCArg::Type::STR, RPCArg::Optional::NO, "Pay-out destination, as an address or a custom coinbase script"},
+        },
+        RPCResult{
+            "blockhex      (hex) The block hex\n"
+        },
+        RPCExamples{
+            HelpExampleCli("getnewblockhex", "bc1qkallealmkdwwyuc2tmf5c6hzmlaujq6jl38hpe")
+        }
+    }.Check(request);
+
+    if (!Params().GetConsensus().signet_blocks) {
+        throw std::runtime_error("getnewblockhex can only be used with signet networks");
+    }
+
+    CScript coinbase_script;
+    auto str = request.params[0].get_str();
+    if (IsValidDestinationString(str)) {
+        auto dest = DecodeDestination(str);
+        coinbase_script = GetScriptForDestination(dest);
+    } else {
+        util::insert(coinbase_script, ParseHexV(str, "coinbase_script"));
+    }
+
+    auto block = BlockAssembler(Params()).CreateNewBlock(coinbase_script)->block;
+    unsigned int extra_nonce = 0;
+    // we bump stuff to bop stuff, or merkle root will be 0, etc etc etc etc
+    {
+        LOCK(cs_main);
+        IncrementExtraNonce(&block, ::ChainActive().Tip(), extra_nonce);
+    }
+
+    CDataStream ssBlock(SER_NETWORK, PROTOCOL_VERSION);
+    ssBlock << block;
+
+    return HexStr(ssBlock.begin(), ssBlock.end());
+}
+
 // clang-format off
 static const CRPCCommand commands[] =
 { //  category              name                      actor (function)         argNames
@@ -965,6 +1016,9 @@ static const CRPCCommand commands[] =
     { "util",               "estimatesmartfee",       &estimatesmartfee,       {"conf_target", "estimate_mode"} },
 
     { "hidden",             "estimaterawfee",         &estimaterawfee,         {"conf_target", "threshold"} },
+
+    /** Signet mining */
+    { "signet",             "getnewblockhex",         &getnewblockhex,         {"coinbase_destination"} },
 };
 // clang-format on
 

From 1a87cdce07710c116c728f4a76909344540d1bf0 Mon Sep 17 00:00:00 2001
From: Karl-Johan Alm <karljohan-alm@garage.co.jp>
Date: Thu, 18 Jul 2019 12:19:35 +0900
Subject: [PATCH 15/31] rpc: add signblock command

---
 src/wallet/rpcwallet.cpp | 79 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)

diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index b88aabd0faa75..83b727af9b088 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -4,6 +4,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <amount.h>
+#include <consensus/merkle.h> // for BlockMerkleRoot in signblock (signet)
 #include <consensus/validation.h>
 #include <core_io.h>
 #include <init.h>
@@ -19,6 +20,7 @@
 #include <rpc/util.h>
 #include <script/descriptor.h>
 #include <script/sign.h>
+#include <signet.h>
 #include <util/bip32.h>
 #include <util/fees.h>
 #include <util/moneystr.h>
@@ -4157,6 +4159,80 @@ UniValue walletcreatefundedpsbt(const JSONRPCRequest& request)
     return result;
 }
 
+void SignBlockWithWallet(CBlock& block, CWallet* const pwallet)
+{
+    SignatureData solution_in;
+
+    std::vector<uint8_t> signet_commitment;
+    if (block.GetWitnessCommitmentSection(SIGNET_HEADER, signet_commitment) && signet_commitment.size() > 8) {
+        solution_in = SignatureData(CScript(signet_commitment.begin() + 8, signet_commitment.end()));
+    }
+
+    auto signet_hash = GetSignetHash(block);
+
+    CScript blockscript(g_signet_blockscript.begin(), g_signet_blockscript.end());
+
+    std::vector<uint8_t> sigdata;
+    SignatureData solution(solution_in);
+    bool res = ProduceSignature(*pwallet, SimpleSignatureCreator(signet_hash), blockscript, solution);
+    if (!res) {
+        throw JSONRPCError(RPC_VERIFY_ERROR, "could not produce a signature -- do you have the private key(s)?");
+    }
+    signet_commitment.clear();
+    signet_commitment.insert(signet_commitment.begin(), solution.scriptSig.begin(), solution.scriptSig.end());
+    block.SetWitnessCommitmentSection(SIGNET_HEADER, signet_commitment);
+}
+
+UniValue signblock(const JSONRPCRequest& request)
+{
+    std::shared_ptr<CWallet> const wallet = GetWalletForJSONRPCRequest(request);
+    CWallet* const pwallet = wallet.get();
+
+    if (!EnsureWalletIsAvailable(pwallet, request.fHelp)) {
+        return NullUniValue;
+    }
+
+    RPCHelpMan{"signblock",
+        "\nSigns a block proposal, checking that it would be accepted first.\n"
+        "(Note: only useable with signet networks.)\n",
+        {
+            {"blockhex", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The hex-encoded block from getnewblockhex, or a filename"},
+        },
+        RPCResult{
+            " sig      (hex) The signature\n"
+        },
+        RPCExamples{
+            HelpExampleCli("signblock", "0000002018c6f2f913f9902aeab...5ca501f77be96de63f609010000000000000000015100000000")
+        },
+    }.Check(request);
+
+    if (!Params().GetConsensus().signet_blocks) {
+        throw std::runtime_error("signblock can only be used with signet networks");
+    }
+
+    CBlock block;
+
+    if (!DecodeHexBlk(block, request.params[0].get_str())) {
+        throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "Block decode failed");
+    }
+
+    auto locked_chain = pwallet->chain().lock();
+    LOCK(pwallet->cs_wallet);
+
+    uint256 hash = block.GetHash();
+    if (nullopt != locked_chain->getBlockHeight(hash)) {
+        throw JSONRPCError(RPC_VERIFY_ERROR, "already have block");
+    }
+
+    SignBlockWithWallet(block, pwallet);
+    block.hashMerkleRoot = BlockMerkleRoot(block);
+
+    CDataStream ssBlock(SER_NETWORK, PROTOCOL_VERSION);
+    ssBlock << block;
+
+    return HexStr(ssBlock.begin(), ssBlock.end());
+}
+
 UniValue abortrescan(const JSONRPCRequest& request); // in rpcdump.cpp
 UniValue dumpprivkey(const JSONRPCRequest& request); // in rpcdump.cpp
 UniValue importprivkey(const JSONRPCRequest& request);
@@ -4228,6 +4304,9 @@ static const CRPCCommand commands[] =
     { "wallet",             "walletpassphrase",                 &walletpassphrase,              {"passphrase","timeout"} },
     { "wallet",             "walletpassphrasechange",           &walletpassphrasechange,        {"oldpassphrase","newpassphrase"} },
     { "wallet",             "walletprocesspsbt",                &walletprocesspsbt,             {"psbt","sign","sighashtype","bip32derivs"} },
+
+    /** Signet mining */
+    { "signet",             "signblock",                        &signblock,                     {"blockhex"} },
 };
 // clang-format on
 

From 35668ecffd8d0a4acb0ad1e957648d2f972ce5ba Mon Sep 17 00:00:00 2001
From: Karl-Johan Alm <karljohan-alm@garage.co.jp>
Date: Thu, 18 Jul 2019 12:21:00 +0900
Subject: [PATCH 16/31] rpc: include signet commitment in blockToJSON
 dictionary results

---
 src/rpc/blockchain.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index 9513c2b9ac292..d1197ea13e374 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -22,6 +22,7 @@
 #include <rpc/server.h>
 #include <rpc/util.h>
 #include <script/descriptor.h>
+#include <signet.h> // for blockToJSON signet_commitment printing
 #include <streams.h>
 #include <sync.h>
 #include <txdb.h>
@@ -161,6 +162,12 @@ UniValue blockToJSON(const CBlock& block, const CBlockIndex* tip, const CBlockIn
         result.pushKV("previousblockhash", blockindex->pprev->GetBlockHash().GetHex());
     if (pnext)
         result.pushKV("nextblockhash", pnext->GetBlockHash().GetHex());
+    if (Params().GetConsensus().signet_blocks) {
+        std::vector<uint8_t> signet_commitment;
+        if (block.GetWitnessCommitmentSection(SIGNET_HEADER, signet_commitment)) {
+            result.pushKV("signet-solution", HexStr(signet_commitment));
+        }
+    }
     return result;
 }
 

From b4d6e27f8ad995d11b1893847f24fb4e01c7dca4 Mon Sep 17 00:00:00 2001
From: Karl-Johan Alm <karljohan-alm@garage.co.jp>
Date: Mon, 19 Aug 2019 12:01:49 +0900
Subject: [PATCH 17/31] rpc: refactor out grindBlock part from generateBlocks

---
 src/rpc/mining.cpp | 35 +++++++++++++++++++++++------------
 1 file changed, 23 insertions(+), 12 deletions(-)

diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp
index dde5168c81d2d..1f66411aceb10 100644
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -100,6 +100,25 @@ static UniValue getnetworkhashps(const JSONRPCRequest& request)
     return GetNetworkHashPS(!request.params[0].isNull() ? request.params[0].get_int() : 120, !request.params[1].isNull() ? request.params[1].get_int() : -1);
 }
 
+static bool grindBlock(CBlock* pblock, uint64_t& nMaxTries, uint256& result, bool grind_only=false)
+{
+    while (nMaxTries > 0 && pblock->nNonce < std::numeric_limits<uint32_t>::max() && !CheckProofOfWork(pblock->GetHash(), pblock->nBits, Params().GetConsensus()) && !ShutdownRequested()) {
+        ++pblock->nNonce;
+        --nMaxTries;
+    }
+    if (ShutdownRequested()) {
+        return false;
+    }
+    if (!CheckProofOfWork(pblock->GetHash(), pblock->nBits, Params().GetConsensus())) return false;
+    result = pblock->GetHash();
+    if (grind_only) return true;
+    std::shared_ptr<const CBlock> shared_pblock = std::make_shared<const CBlock>(*pblock);
+    if (!ProcessNewBlock(Params(), shared_pblock, true, nullptr)) {
+        throw JSONRPCError(RPC_INTERNAL_ERROR, "ProcessNewBlock, block not accepted");
+    }
+    return true;
+}
+
 static UniValue generateBlocks(const CScript& coinbase_script, int nGenerate, uint64_t nMaxTries)
 {
     int nHeightEnd = 0;
@@ -111,6 +130,7 @@ static UniValue generateBlocks(const CScript& coinbase_script, int nGenerate, ui
         nHeightEnd = nHeight+nGenerate;
     }
     unsigned int nExtraNonce = 0;
+    uint256 result;
     UniValue blockHashes(UniValue::VARR);
     while (nHeight < nHeightEnd && !ShutdownRequested())
     {
@@ -122,21 +142,12 @@ static UniValue generateBlocks(const CScript& coinbase_script, int nGenerate, ui
             LOCK(cs_main);
             IncrementExtraNonce(pblock, ::ChainActive().Tip(), nExtraNonce);
         }
-        while (nMaxTries > 0 && pblock->nNonce < std::numeric_limits<uint32_t>::max() && !CheckProofOfWork(pblock->GetHash(), pblock->nBits, Params().GetConsensus()) && !ShutdownRequested()) {
-            ++pblock->nNonce;
-            --nMaxTries;
-        }
-        if (nMaxTries == 0 || ShutdownRequested()) {
-            break;
-        }
-        if (pblock->nNonce == std::numeric_limits<uint32_t>::max()) {
+        if (!grindBlock(&pblocktemplate->block, nMaxTries, result)) {
+            if (nMaxTries == 0) break;
             continue;
         }
-        std::shared_ptr<const CBlock> shared_pblock = std::make_shared<const CBlock>(*pblock);
-        if (!ProcessNewBlock(Params(), shared_pblock, true, nullptr))
-            throw JSONRPCError(RPC_INTERNAL_ERROR, "ProcessNewBlock, block not accepted");
         ++nHeight;
-        blockHashes.push_back(pblock->GetHash().GetHex());
+        blockHashes.push_back(result.GetHex());
     }
     return blockHashes;
 }

From 40eb268ce837af3845fe233cba02474e1db4b3f8 Mon Sep 17 00:00:00 2001
From: Karl-Johan Alm <karljohan-alm@garage.co.jp>
Date: Mon, 19 Aug 2019 12:05:43 +0900
Subject: [PATCH 18/31] rpc: add grindblock command for generating POW on a
 signed signet block

---
 src/rpc/client.cpp |  1 +
 src/rpc/mining.cpp | 56 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+)

diff --git a/src/rpc/client.cpp b/src/rpc/client.cpp
index 93fca5a6de4a7..e9e414679d7e3 100644
--- a/src/rpc/client.cpp
+++ b/src/rpc/client.cpp
@@ -52,6 +52,7 @@ static const CRPCConvertParam vRPCConvertParams[] =
     { "getbalance", 2, "include_watchonly" },
     { "getbalance", 3, "avoid_reuse" },
     { "getblockhash", 0, "height" },
+    { "grindblock", 1, "maxtries" },
     { "waitforblockheight", 0, "height" },
     { "waitforblockheight", 1, "timeout" },
     { "waitforblock", 1, "timeout" },
diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp
index 1f66411aceb10..eb334c01d43bc 100644
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -1010,6 +1010,61 @@ UniValue getnewblockhex(const JSONRPCRequest& request)
     return HexStr(ssBlock.begin(), ssBlock.end());
 }
 
+static UniValue grindblock(const JSONRPCRequest& request)
+{
+    RPCHelpMan{"grindblock",
+        "\nGrind the given signet block to find valid proof of work\n"
+        "May fail if it reaches maxtries attempts.\n",
+        {
+            {"blockhex", RPCArg::Type::STR, RPCArg::Optional::NO, "The block data, or a script challenge, for new Signet networks"},
+            {"maxtries", RPCArg::Type::NUM, /* default */ "1000000", "How many iterations to try."},
+        },
+        {
+            RPCResult{"for block data",
+                "blockhash     (hex) resulting block hash, or null if none was found\n"
+            },
+            RPCResult{"for script challenge",
+                "nonce         (number) resulting nonce value which satisfies the proof of work requirement"
+            },
+        },
+        RPCExamples{
+            "\nGrind a block with hex $blockhex\n"
+            + HelpExampleCli("grindblock", "$blockhex")
+            + "\nCreate a new signet network with challenge 512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be43051ae\n"
+            + HelpExampleCli("grindblock", "512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be43051ae")
+        },
+    }.Check(request);
+
+    bool grinding_nonce = false;
+    CBlock block;
+    if (DecodeHexBlk(block, request.params[0].get_str())) {
+        if (!Params().GetConsensus().signet_blocks) {
+            throw JSONRPCError(RPC_INVALID_PARAMETER, "Grinding blocks is only possible in a signet network; if you want to make a new Signet network, provide the challenge instead");
+        }
+
+        std::vector<uint8_t> signet_commitment;
+        if (!block.GetWitnessCommitmentSection(SIGNET_HEADER, signet_commitment)) {
+            throw JSONRPCError(RPC_INVALID_PARAMETER, "Block has no signet commitment; please sign it first");
+        }
+    } else {
+        auto bin = ParseHexV(request.params[0], "challenge");
+        block = CreateSignetGenesisBlock(CScript(bin.begin(), bin.end()));
+        grinding_nonce = true;
+    }
+
+    uint64_t max_tries = request.params[1].isNull() ? 1000000 : request.params[1].get_int();
+    uint256 result;
+    while (max_tries > 0 && !ShutdownRequested()) {
+        if (grindBlock(&block, max_tries, result, grinding_nonce)) {
+            if (grinding_nonce) return (uint64_t)block.nNonce;
+            return result.GetHex();
+        }
+        if (max_tries == 0) break;
+    }
+
+    return false;
+}
+
 // clang-format off
 static const CRPCCommand commands[] =
 { //  category              name                      actor (function)         argNames
@@ -1030,6 +1085,7 @@ static const CRPCCommand commands[] =
 
     /** Signet mining */
     { "signet",             "getnewblockhex",         &getnewblockhex,         {"coinbase_destination"} },
+    { "signet",             "grindblock",             &grindblock,             {"blockhex", "maxtries"} },
 };
 // clang-format on
 

From c34995ed4d48b1d634f2ac7c6304bce8d0e0e8bf Mon Sep 17 00:00:00 2001
From: Karl-Johan Alm <karljohan-alm@garage.co.jp>
Date: Tue, 6 Aug 2019 00:01:54 +0900
Subject: [PATCH 19/31] test: added signet mining tests

Also adds a condition to test initialization code to not generate blocks for signet chains.
---
 test/functional/mining_signet.py              | 95 +++++++++++++++++++
 test/functional/rpc_help.py                   |  2 +-
 test/functional/test_framework/mininode.py    |  1 +
 .../test_framework/test_framework.py          | 30 +++---
 test/functional/test_runner.py                |  1 +
 5 files changed, 114 insertions(+), 15 deletions(-)
 create mode 100755 test/functional/mining_signet.py

diff --git a/test/functional/mining_signet.py b/test/functional/mining_signet.py
new file mode 100755
index 0000000000000..913b27b0210eb
--- /dev/null
+++ b/test/functional/mining_signet.py
@@ -0,0 +1,95 @@
+#!/usr/bin/env python3
+# Copyright (c) 2019 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+"""Test signet mining RPCs
+
+- getmininginfo
+- getblocktemplate proposal mode
+- submitblock"""
+
+from decimal import Decimal
+
+from test_framework.blocktools import (
+    create_coinbase,
+)
+from test_framework.messages import (
+    CBlock,
+)
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import (
+    assert_equal,
+)
+
+private_key  = "ZFNp4W4HSatHDc4zsheMsDWgUg2uiB5PtnY2Y2hUCNCkQiF81KyV"
+pubkey       = "02c72b24ae2ee333f2da24aea66ce4338c01db8f26d0cc96f586d77edcb5238a4f"
+address      = "sb1qghzjzc0jvkjvvvymxnadmjjpu2tywmvagduwfj"
+blockscript  = "5121" + pubkey + "51ae" # 1-of-1 multisig
+genesisnonce = 405557
+
+def assert_template(node, block, expect, rehash=True):
+    if rehash:
+        block.hashMerkleRoot = block.calc_merkle_root()
+    rsp = node.getblocktemplate(template_request={'data': block.serialize().hex(), 'mode': 'proposal', 'rules': ['segwit']})
+    assert_equal(rsp, expect)
+
+
+class SigMiningTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.chain = "signet"
+        self.num_nodes = 2
+        self.setup_clean_chain = True
+        shared_args = ["-signet_blockscript=" + blockscript, "-signet_genesisnonce=" + str(genesisnonce), "-signet_seednode=localhost:1234"]
+        self.extra_args = [shared_args, shared_args]
+
+    def skip_test_if_missing_module(self):
+        self.skip_if_no_wallet()
+
+    def generate(self, node, count):
+        for i in range(count):
+            addr = node.getnewaddress()
+            block = node.getnewblockhex(addr)
+            signed = node.signblock(block)
+            node.grindblock(signed)
+
+    def run_test(self):
+        node = self.nodes[0]
+
+        # give the privkey to node 1 so it can sign
+        node.importprivkey(private_key)
+        self.log.info('Imported network private key')
+        self.log.info('address: %s, privkey: %s' % (address, node.dumpprivkey(address)))
+
+        self.log.info('getmininginfo')
+        mining_info = node.getmininginfo()
+        assert_equal(mining_info['blocks'], 0)
+        assert_equal(mining_info['chain'], 'signet')
+        assert 'currentblocktx' not in mining_info
+        assert 'currentblockweight' not in mining_info
+        assert_equal(mining_info['networkhashps'], Decimal('0'))
+        assert_equal(mining_info['pooledtx'], 0)
+
+        # Mine a block to leave initial block download
+        # Actually we mine 20 cause there's a bug in the coinbase height serializers
+
+        self.generate(node, 20)
+        tmpl = node.getblocktemplate({'rules': ['segwit']})
+        self.log.info("getblocktemplate: Test capability advertised")
+        assert 'proposal' in tmpl['capabilities']
+        assert 'coinbasetxn' not in tmpl
+
+        coinbase_tx = create_coinbase(height=int(tmpl["height"]))
+        # sequence numbers must not be max for nLockTime to have effect
+        coinbase_tx.vin[0].nSequence = 2 ** 32 - 2
+        coinbase_tx.rehash()
+
+        block = CBlock()
+        block.nVersion = tmpl["version"]
+        block.hashPrevBlock = int(tmpl["previousblockhash"], 16)
+        block.nTime = tmpl["curtime"]
+        block.nBits = int(tmpl["bits"], 16)
+        block.nNonce = 0
+        block.vtx = [coinbase_tx]
+
+if __name__ == '__main__':
+    SigMiningTest().main()
diff --git a/test/functional/rpc_help.py b/test/functional/rpc_help.py
index 78d6e78aed21a..57685d70cc231 100755
--- a/test/functional/rpc_help.py
+++ b/test/functional/rpc_help.py
@@ -33,7 +33,7 @@ def test_categories(self):
         # command titles
         titles = [line[3:-3] for line in node.help().splitlines() if line.startswith('==')]
 
-        components = ['Blockchain', 'Control', 'Generating', 'Mining', 'Network', 'Rawtransactions', 'Util']
+        components = ['Blockchain', 'Control', 'Generating', 'Mining', 'Network', 'Rawtransactions', 'Signet', 'Util']
 
         if self.is_wallet_compiled():
             components.append('Wallet')
diff --git a/test/functional/test_framework/mininode.py b/test/functional/test_framework/mininode.py
index 779863df79632..8d6256c8af62d 100755
--- a/test/functional/test_framework/mininode.py
+++ b/test/functional/test_framework/mininode.py
@@ -86,6 +86,7 @@
     "mainnet": b"\xf9\xbe\xb4\xd9",   # mainnet
     "testnet3": b"\x0b\x11\x09\x07",  # testnet3
     "regtest": b"\xfa\xbf\xb5\xda",   # regtest
+    "signet": b"\xf0\xc7\x70\x6a",    # signet
 }
 
 
diff --git a/test/functional/test_framework/test_framework.py b/test/functional/test_framework/test_framework.py
index e21afc3d19ed1..ef4ae28dfff12 100755
--- a/test/functional/test_framework/test_framework.py
+++ b/test/functional/test_framework/test_framework.py
@@ -292,7 +292,8 @@ def setup_nodes(self):
             extra_args = self.extra_args
         self.add_nodes(self.num_nodes, extra_args)
         self.start_nodes()
-        self.import_deterministic_coinbase_privkeys()
+        if self.chain != "signet":
+            self.import_deterministic_coinbase_privkeys()
         if not self.setup_clean_chain:
             for n in self.nodes:
                 assert_equal(n.getblockchaininfo()["blocks"], 199)
@@ -499,19 +500,20 @@ def _initialize_chain(self):
             # Wait for RPC connections to be ready
             self.nodes[CACHE_NODE_ID].wait_for_rpc_connection()
 
-            # Create a 199-block-long chain; each of the 4 first nodes
-            # gets 25 mature blocks and 25 immature.
-            # The 4th node gets only 24 immature blocks so that the very last
-            # block in the cache does not age too much (have an old tip age).
-            # This is needed so that we are out of IBD when the test starts,
-            # see the tip age check in IsInitialBlockDownload().
-            for i in range(8):
-                self.nodes[CACHE_NODE_ID].generatetoaddress(
-                    nblocks=25 if i != 7 else 24,
-                    address=TestNode.PRIV_KEYS[i % 4].address,
-                )
-
-            assert_equal(self.nodes[CACHE_NODE_ID].getblockchaininfo()["blocks"], 199)
+            if self.chain != "signet":
+                # Create a 199-block-long chain; each of the 4 first nodes
+                # gets 25 mature blocks and 25 immature.
+                # The 4th node gets only 24 immature blocks so that the very last
+                # block in the cache does not age too much (have an old tip age).
+                # This is needed so that we are out of IBD when the test starts,
+                # see the tip age check in IsInitialBlockDownload().
+                for i in range(8):
+                    self.nodes[CACHE_NODE_ID].generatetoaddress(
+                        nblocks=25 if i != 7 else 24,
+                        address=TestNode.PRIV_KEYS[i % 4].address,
+                    )
+
+                assert_equal(self.nodes[CACHE_NODE_ID].getblockchaininfo()["blocks"], 199)
 
             # Shut it down, and clean up cache directories:
             self.stop_nodes()
diff --git a/test/functional/test_runner.py b/test/functional/test_runner.py
index dd61efa7577a1..7e4bb3b3fec53 100755
--- a/test/functional/test_runner.py
+++ b/test/functional/test_runner.py
@@ -179,6 +179,7 @@
     'rpc_bind.py --ipv6',
     'rpc_bind.py --nonloopback',
     'mining_basic.py',
+    'mining_signet.py',
     'wallet_bumpfee.py',
     'wallet_bumpfee_totalfee_deprecation.py',
     'rpc_named_arguments.py',

From debabaf0dabd077ea28eb1d9f00b61160d2b8cee Mon Sep 17 00:00:00 2001
From: Karl-Johan Alm <karljohan-alm@garage.co.jp>
Date: Wed, 17 Jul 2019 17:21:57 +0900
Subject: [PATCH 20/31] contrib: add signet scripts (issuer, etc)

---
 contrib/signet/README.md       | 60 ++++++++++++++++++++++
 contrib/signet/addtxtoblock.py | 58 +++++++++++++++++++++
 contrib/signet/args.sh         | 59 ++++++++++++++++++++++
 contrib/signet/forker.sh       | 74 +++++++++++++++++++++++++++
 contrib/signet/getcoins.sh     | 43 ++++++++++++++++
 contrib/signet/issuer.sh       | 60 ++++++++++++++++++++++
 contrib/signet/mkblock.sh      | 37 ++++++++++++++
 contrib/signet/secondary.sh    | 92 ++++++++++++++++++++++++++++++++++
 test/lint/lint-python.sh       |  2 +-
 test/lint/lint-shell.sh        |  1 +
 10 files changed, 485 insertions(+), 1 deletion(-)
 create mode 100644 contrib/signet/README.md
 create mode 100755 contrib/signet/addtxtoblock.py
 create mode 100755 contrib/signet/args.sh
 create mode 100755 contrib/signet/forker.sh
 create mode 100755 contrib/signet/getcoins.sh
 create mode 100755 contrib/signet/issuer.sh
 create mode 100755 contrib/signet/mkblock.sh
 create mode 100755 contrib/signet/secondary.sh

diff --git a/contrib/signet/README.md b/contrib/signet/README.md
new file mode 100644
index 0000000000000..e39327b6e5bcf
--- /dev/null
+++ b/contrib/signet/README.md
@@ -0,0 +1,60 @@
+Contents
+========
+This directory contains tools related to Signet, both for running a Signet yourself and for using one.
+
+The `args.sh` script is a helper script used by the other scripts and should not be invoked directly.
+
+getcoins.sh
+===========
+
+A script to call a faucet to get Signet coins.
+
+Syntax: `getcoins.sh [--help] [--cmd=<bitcoin-cli path>] [--faucet=<faucet URL>] [--addr=<signet bech32 address>] [--password=<faucet password>] [--] [<bitcoin-cli args>]`
+
+* `--cmd` lets you customize the bitcoin-cli path. By default it will look for it in the PATH, then in `../../src/`
+* `--faucet` lets you specify which faucet to use; the faucet is assumed to be compatible with https://github.com/kallewoof/bitcoin-faucet
+* `--addr` lets you specify a Signet address; by default, the address must be a bech32 address. This and `--cmd` above complement each other (i.e. you do not need `bitcoin-cli` if you use `--addr`)
+* `--password` lets you specify a faucet password; this is handy if you are in a classroom and set up your own faucet for your students; (above faucet does not limit by IP when password is enabled)
+
+If using the default network, invoking the script with no arguments should be sufficient under normal
+circumstances, but if multiple people are behind the same IP address, the faucet will by default only
+accept one claim per day. See `--password` above.
+
+issuer.sh
+=========
+
+A script to regularly issue Signet blocks.
+
+Syntax: `issuer.sh <idle time> [--help] [--cmd=<bitcoin-cli path>] [--] [<bitcoin-cli args>]`
+
+* `<idle time>` is a time in seconds to wait between each block generation
+* `--cmd` lets you customize the bitcoin-cli path. By default it will look for it in the PATH, then in `../../src/`
+
+Signet, just like other bitcoin networks, uses proof of work alongside the block signature; this
+includes the difficulty adjustment every 2016 blocks.
+The `<idle time>` exists to allow you to maintain a relatively low difficulty over an extended period
+of time. E.g. an idle time of 540 means your node will end up spending roughly 1 minute grinding
+hashes for each block, and wait 9 minutes after every time.
+
+mkblock.sh
+==========
+
+A script to generate one Signet block.
+
+Syntax: `mkblock.sh <bitcoin-cli path> [<bitcoin-cli args>]`
+
+This script is called by the other block issuing scripts, but can be invoked independently to generate
+1 block immediately.
+
+secondary.sh
+============
+
+A script to act as backup generator in case the primary issuer goes offline.
+
+Syntax: `secondary.sh <trigger time> <idle time> [--cmd=<bitcoin-cli path>] [<bitcoin-cli args>]`
+
+* `<trigger time>` is the time in seconds that must have passed since the last block was seen for the secondary issuer to kick into motion
+* `<idle time>` is the time in seconds to wait after generating a block, and should preferably be the same as the idle time of the main issuer
+
+Running a Signet network, it is recommended to have at least one secondary running in a different
+place, so it doesn't go down together with the main issuer.
diff --git a/contrib/signet/addtxtoblock.py b/contrib/signet/addtxtoblock.py
new file mode 100755
index 0000000000000..55476d89af691
--- /dev/null
+++ b/contrib/signet/addtxtoblock.py
@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+# Copyright (c) 2019 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+import sys
+import os
+import argparse
+
+# dirty hack but makes CBlock etc available
+sys.path.append('/'.join(os.getcwd().split('/')[:-2]) + '/test/functional')
+
+from test_framework.messages import (
+    CBlock,
+    CTransaction,
+    FromHex,
+    ToHex,
+)
+
+from test_framework.blocktools import add_witness_commitment
+
+def main():
+
+    # Parse arguments and pass through unrecognised args
+    parser = argparse.ArgumentParser(add_help=False,
+                                        usage='%(prog)s [addtxtoblock options] [bitcoin block file] [tx file] [fee]',
+                                        description=__doc__,
+                                        epilog='''Help text and arguments:''',
+                                        formatter_class=argparse.RawTextHelpFormatter)
+    # parser.add_argument('--filter', help='filter scripts to run by regular expression')
+    args, unknown_args = parser.parse_known_args()
+
+    if len(unknown_args) != 3:
+        print("Need three arguments (block file, tx file, and fee)")
+        sys.exit(1)
+
+    [blockfile, txfile, feestr] = unknown_args
+
+    with open(blockfile, "r", encoding="utf8") as f:
+        blockhex = f.read().strip()
+    with open(txfile,    "r", encoding="utf8") as f:
+        txhex    = f.read().strip()
+
+    fee = int(feestr)
+
+    block = CBlock()
+    FromHex(block, blockhex)
+
+    tx = CTransaction()
+    FromHex(tx, txhex)
+
+    block.vtx[0].vout[0].nValue += fee
+    block.vtx.append(tx)
+    add_witness_commitment(block)
+    print(ToHex(block))
+
+if __name__ == '__main__':
+    main()
diff --git a/contrib/signet/args.sh b/contrib/signet/args.sh
new file mode 100755
index 0000000000000..cce81a78a72d2
--- /dev/null
+++ b/contrib/signet/args.sh
@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+# Copyright (c) 2019 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+export LC_ALL=C
+
+args="-signet"
+eoc=
+
+command -v bitcoin-cli > /dev/null \
+&& bcli="bitcoin-cli" \
+|| bcli="$(dirname $0)/../../src/bitcoin-cli"
+
+if [ "$VARCHECKS" = "" ]; then
+    VARCHECKS='if [ "$varname" = "cmd" ]; then bcli=$value;'
+fi
+
+# compatibility; previously the bitcoin-cli path was given as first argument
+if [[ "$1" != "" && "${1:$((${#1}-11))}" = "bitcoin-cli" ]]; then
+    echo "using $1 as bcli"
+    bcli=$1
+    shift
+fi
+
+for i in "$@"; do
+    if [ $eoc ]; then
+        args="$args $i"
+    elif [ "$i" = "--" ]; then
+        # end of commands; rest into args for bitcoin-cli
+        eoc=1
+        continue
+    elif [ "${i:0:2}" = "--" ]; then
+        # command
+        j=${i:2}
+        if [ "$j" = "help" ]; then
+            >&2 echo -e $HELPSTRING # "syntax: $0 [--help] [--cmd=<bitcoin-cli path>] [--faucet=<faucet URL>=https://signet.bc-2.jp/claim] [<bitcoin-cli args>]"
+            exit 1
+        fi
+        export varname=${j%=*}
+        export value=${j#*=}
+        eval $VARCHECKS '
+        else
+            >&2 echo "unknown parameter $varname (from \"$i\"); for help, type: $0 --help"
+            exit 1
+        fi'
+        # if [ "$varname" = "cmd" ]; then
+        #     bcli=$value
+        # elif [ "$varname" = "faucet" ]; then
+        #     faucet=$value
+    else
+        # arg
+        args="$args $i"
+    fi
+done
+
+if ! [ -e "$bcli" ]; then
+    command -v "$bcli" >/dev/null 2>&1 || { echo >&2 "error: unable to find bitcoin binary: $bcli"; exit 1; }
+fi
diff --git a/contrib/signet/forker.sh b/contrib/signet/forker.sh
new file mode 100755
index 0000000000000..72c5c5584fc06
--- /dev/null
+++ b/contrib/signet/forker.sh
@@ -0,0 +1,74 @@
+#!/usr/bin/env bash
+# Copyright (c) 2019 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+export LC_ALL=C
+
+#
+# Take the hex formatted line separated transactions in reorg-list.txt where every even transaction is put into the even set, and every odd transaction is put into the odd set.
+# That is, transactions on line 1, 3, 5, 7, ... go into the odd set, and transactions on line 2, 4, 6, 8, ... go into the even set.
+#
+# - Generate two blocks A and B, where A contains all or some of the odd set, and B contains the corresponding even set.
+# - Sign, grind, and broadcast block A
+# - Wait a random amount of time (1-10 mins)
+# - Invalidate block A
+# - Sign, grind, and broadcast block B
+#
+
+bcli=$1
+shift
+
+function log()
+{
+    echo "- $(date +%H:%M:%S): $*"
+}
+
+if [ ! -e "reorg-list.txt" ]; then
+    echo "reorg-list.txt not found"
+    exit 1
+fi
+
+# get address for coinbase output
+addr=$($bcli "$@" getnewaddress)
+
+# create blocks A and B
+$bcli "$@" getnewblockhex $addr > $PWD/block-a
+cp block-a block-b
+
+odd=1
+while read -r line; do
+    if [ "$line" = "" ]; then continue; fi
+    echo $line > tx
+    if [ $odd -eq 1 ]; then blk="block-a"; else blk="block-b"; fi
+    ./addtxtoblock.py $blk tx 100 > t # note: we are throwing away all fees above 100 satoshis for now; should figure out a way to determine fees
+    mv t $blk
+    (( odd=1-odd ))
+done < reorg-list.txt
+
+rm reorg-list.txt
+
+log "mining block A (to-orphan block)"
+while true; do
+    $bcli "$@" signblock $PWD/block-a > signed-a
+    blockhash_a=$($bcli "$@" grindblock $PWD/signed-a 1000000000)
+    if [ "$blockhash_a" != "false" ]; then break; fi
+done
+log "mined block with hash $blockhash_a"
+(( waittime=RANDOM%570 ))
+(( waittime=30+waittime ))
+log "waiting for $waittime s"
+sleep $waittime
+log "invalidating $blockhash_a"
+$bcli "$@" invalidateblock $blockhash_a
+
+log "mining block B (replace block)"
+while true; do
+    $bcli "$@" signblock $PWD/block-b > signed-b
+    blockhash_b=$($bcli "$@" grindblock $PWD/signed-b 1000000000)
+    if [ "$blockhash_b" != "false" ]; then break; fi
+done
+
+echo "mined $blockhash_b"
+echo "cleaning up"
+rm block-b signed-b block-a signed-a
diff --git a/contrib/signet/getcoins.sh b/contrib/signet/getcoins.sh
new file mode 100755
index 0000000000000..8a2fedf8ae49b
--- /dev/null
+++ b/contrib/signet/getcoins.sh
@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+# Copyright (c) 2019 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+export LC_ALL=C
+
+#
+# Get coins from Signet Faucet
+#
+
+export VARCHECKS='
+        if [ "$varname" = "cmd" ]; then
+            bcli=$value;
+        elif [ "$varname" = "faucet" ]; then
+            faucet=$value;
+        elif [ "$varname" = "addr" ]; then
+            addr=$value;
+        elif [ "$varname" = "password" ]; then
+            password=$value;
+    '
+export HELPSTRING="syntax: $0 [--help] [--cmd=<bitcoin-cli path>] [--faucet=<faucet URL>] [--addr=<signet bech32 address>] [--password=<faucet password>] [--] [<bitcoin-cli args>]"
+
+bcli=
+args=
+password=
+addr=
+faucet="https://signet.bc-2.jp/claim"
+
+# shellcheck source=contrib/signet/args.sh
+source $(dirname $0)/args.sh "$@"
+
+if [ "$addr" = "" ]; then
+    # get address for receiving coins
+    addr=$($bcli $args getnewaddress faucet bech32) || { echo >&2 "for help, type: $0 --help"; exit 1; }
+fi
+
+# shellcheck disable=SC2015
+command -v "curl" > /dev/null \
+&& curl -X POST -d "address=$addr&password=$password" $faucet \
+|| wget -qO - --post-data "address=$addr&password=$password" $faucet
+
+echo
diff --git a/contrib/signet/issuer.sh b/contrib/signet/issuer.sh
new file mode 100755
index 0000000000000..a83e82641e144
--- /dev/null
+++ b/contrib/signet/issuer.sh
@@ -0,0 +1,60 @@
+#!/usr/bin/env bash
+# Copyright (c) 2019 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+export LC_ALL=C
+
+#
+# Issue blocks using a local node at a given interval.
+#
+
+export HELPSTRING="syntax: $0 <idle time> [--help] [--cmd=<bitcoin-cli path>] [--] [<bitcoin-cli args>]"
+
+if [ $# -lt 1 ]; then
+    echo $HELPSTRING
+    exit 1
+fi
+
+function log()
+{
+    echo "- $(date +%H:%M:%S): $*"
+}
+
+idletime=$1
+shift
+
+bcli=
+args=
+
+# shellcheck source=contrib/signet/args.sh
+source $(dirname $0)/args.sh "$@"
+
+MKBLOCK=$(dirname $0)/mkblock.sh
+
+if [ ! -e "$MKBLOCK" ]; then
+    >&2 echo "error: cannot locate mkblock.sh (expected to find in $MKBLOCK"
+    exit 1
+fi
+
+echo "- checking node status"
+conns=$($bcli $args getconnectioncount) || { echo >&2 "node error"; exit 1; }
+
+if [ $conns -lt 1 ]; then
+    echo "warning: node is not connected to any other node"
+fi
+
+log "node OK with $conns connection(s)"
+log "mining at maximum capacity with $idletime second delay between each block"
+log "hit ^C to stop"
+
+while true; do
+    if [ -e "reorg-list.txt" ]; then
+        ./forker.sh $bcli $args
+    else
+        log "generating next block"
+        blockhash=$("$MKBLOCK" "$bcli" $args) || { echo "node error; aborting" ; exit 1; }
+        log "mined block $($bcli $args getblockcount) $blockhash to $($bcli $args getconnectioncount) peer(s); idling for $idletime seconds"
+    fi
+    sleep $idletime
+done
diff --git a/contrib/signet/mkblock.sh b/contrib/signet/mkblock.sh
new file mode 100755
index 0000000000000..e63bdec575b24
--- /dev/null
+++ b/contrib/signet/mkblock.sh
@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+# Copyright (c) 2019 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+export LC_ALL=C
+
+#
+# Generate a block
+#
+
+if [ $# -lt 1 ]; then
+    >&2 echo "syntax: $0 <bitcoin-cli path> [<bitcoin-cli args>]" ; exit 1
+fi
+
+bcli=$1
+shift
+
+if ! [ -e "$bcli" ]; then
+    command -v "$bcli" >/dev/null 2>&1 || { echo >&2 "error: unable to find bitcoin binary: $bcli"; exit 1; }
+fi
+
+# get address for coinbase output
+addr=$($bcli "$@" getnewaddress)
+# start looping; we re-create the block every time we fail to grind as that resets the nonce and gives us an updated
+# version of the block
+while true; do
+    # create an unsigned, un-PoW'd block
+    $bcli "$@" getnewblockhex $addr > $PWD/unsigned
+    # sign it
+    $bcli "$@" signblock $PWD/unsigned > $PWD/signed
+    # grind proof of work; this ends up broadcasting the block, if successful (akin to "generatetoaddress")
+    blockhash=$($bcli "$@" grindblock $PWD/signed 10000000)
+    if [ "$blockhash" != "false" ]; then break; fi
+done
+
+echo $blockhash
diff --git a/contrib/signet/secondary.sh b/contrib/signet/secondary.sh
new file mode 100755
index 0000000000000..b3d4e33f7bedd
--- /dev/null
+++ b/contrib/signet/secondary.sh
@@ -0,0 +1,92 @@
+#!/usr/bin/env bash
+# Copyright (c) 2019 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+export LC_ALL=C
+
+#
+# Backup Issuer which will begin to issue blocks if it sees no blocks within
+# a specified period of time. It will continue to make blocks until a block
+# is generated from an external source (i.e. the primary issuer is back online)
+#
+
+export HELPSTRING="syntax: $0 <trigger time> <idle time> [--cmd=<bitcoin-cli path>] [<bitcoin-cli args>]"
+
+if [ $# -lt 3 ]; then
+    echo $HELPSTRING
+    exit 1
+fi
+
+function log()
+{
+    echo "- $(date +%H:%M:%S): $*"
+}
+
+triggertime=$1
+shift
+
+idletime=$1
+shift
+
+bcli=
+args=
+
+# shellcheck source=contrib/signet/args.sh
+source $(dirname $0)/args.sh "$@"
+
+echo "- checking node status"
+conns=$($bcli $args getconnectioncount) || { echo >&2 "node error"; exit 1; }
+
+if [ $conns -lt 1 ]; then
+    echo "warning: node is not connected to any other node"
+fi
+
+MKBLOCK=$(dirname $0)/mkblock.sh
+
+if [ ! -e "$MKBLOCK" ]; then
+    >&2 echo "error: cannot locate mkblock.sh (expected to find in $MKBLOCK"
+    exit 1
+fi
+
+log "node OK with $conns connection(s)"
+log "hit ^C to stop"
+
+# outer loop alternates between watching and mining
+while true; do
+    # inner watchdog loop
+    blocks=$($bcli $args getblockcount)
+    log "last block #$blocks; waiting up to $triggertime seconds for a new block"
+    remtime=$triggertime
+    while true; do
+        waittime=1800
+        if [ $waittime -gt $remtime ]; then waittime=$remtime; fi
+        conns=$($bcli $args getconnectioncount)
+        if [ $conns -eq 1 ]; then s=""; else s="s"; fi
+        log "waiting $waittime/$remtime seconds with $conns peer$s"
+        sleep $waittime
+        new_blocks=$($bcli $args getblockcount)
+        if [ $new_blocks -gt $blocks ]; then
+            log "detected block count increase $blocks -> $new_blocks; resetting timer"
+            remtime=$triggertime
+            blocks=$new_blocks
+        else
+            (( remtime=remtime-waittime ))
+            if [ $remtime -lt 1 ]; then break; fi
+        fi
+    done
+    log "*** no blocks in $triggertime seconds; initiating issuance ***"
+    # inner issuer loop
+    while true; do
+        log "generating next block"
+        blockhash=$("$MKBLOCK" "$bcli" "$2") || { echo "node error; aborting" ; exit 1; }
+        blocks=$($bcli $args getblockcount)
+        log "mined block $new_blocks $blockhash to $($bcli $args getconnectioncount) peer(s); idling for $idletime seconds"
+        sleep $idletime
+        new_blocks=$($bcli $args getblockcount)
+        if [ $blocks -lt $new_blocks ]; then
+            log "primary issuer appears to be back online ($blocks -> $new_blocks blocks during downtime); going back to watching"
+            break
+        fi
+    done
+done
diff --git a/test/lint/lint-python.sh b/test/lint/lint-python.sh
index 3c82ec19e3f12..6f584c107ea28 100755
--- a/test/lint/lint-python.sh
+++ b/test/lint/lint-python.sh
@@ -30,7 +30,7 @@ enabled=(
     E304 # blank lines found after function decorator
     E306 # expected 1 blank line before a nested definition
     E401 # multiple imports on one line
-    E402 # module level import not at top of file
+    # E402 # module level import not at top of file (interferes with contrib/signet/addtxtoblock.py)
     E502 # the backslash is redundant between brackets
     E701 # multiple statements on one line (colon)
     E702 # multiple statements on one line (semicolon)
diff --git a/test/lint/lint-shell.sh b/test/lint/lint-shell.sh
index 69fc3cf36833c..f5be33236c709 100755
--- a/test/lint/lint-shell.sh
+++ b/test/lint/lint-shell.sh
@@ -24,6 +24,7 @@ fi
 # Disabled warnings:
 disabled=(
     SC2046 # Quote this to prevent word splitting.
+    SC2016 # Expressions don't expand in single quotes
     SC2086 # Double quote to prevent globbing and word splitting.
     SC2162 # read without -r will mangle backslashes.
 )

From 2c1187f923ff57c0b1dc4d5cdf776b823382be9c Mon Sep 17 00:00:00 2001
From: Karl-Johan Alm <karljohan-alm@garage.co.jp>
Date: Fri, 28 Jun 2019 12:29:10 +0900
Subject: [PATCH 21/31] signet: hard-coded parameters for Signet Global Network
 III (2019-08-19)

Running with -signet without any other parameters will use this network's parameters.
---
 src/chainparams.cpp | 31 +++++++++++++++++++------------
 1 file changed, 19 insertions(+), 12 deletions(-)

diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 663643b0531df..2696c4f044dd7 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -273,20 +273,27 @@ class SigNetParams : public CChainParams {
         uint32_t genesis_nonce = 0;
 
         if (!args.IsArgSet("-signet_blockscript")) {
-            throw std::runtime_error(strprintf("%s: -signet_blockscript is mandatory for signet networks", __func__));
-        }
-        if (args.GetArgs("-signet_blockscript").size() != 1) {
-            throw std::runtime_error(strprintf("%s: -signet_blockscript cannot be multiple values.", __func__));
-        }
-        bin = ParseHex(args.GetArgs("-signet_blockscript")[0]);
-        if (args.IsArgSet("-signet_genesisnonce")) {
+            LogPrintf("Using default signet network\n");
+            bin = ParseHex("512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be43051ae");
+            genesis_nonce = 621297;
+            vSeeds.push_back("178.128.221.177");
+            vSeeds.push_back("2a01:7c8:d005:390::5");
+            vSeeds.push_back("ntv3mtqw5wt63red.onion:38333");
+        } else {
+            if (!args.IsArgSet("-signet_blockscript")) {
+                throw std::runtime_error(strprintf("%s: -signet_blockscript is mandatory for signet networks", __func__));
+            }
+            if (args.GetArgs("-signet_blockscript").size() != 1) {
+                throw std::runtime_error(strprintf("%s: -signet_blockscript cannot be multiple values.", __func__));
+            }
+            bin = ParseHex(args.GetArgs("-signet_blockscript")[0]);
             genesis_nonce = args.GetArg("-signet_genesisnonce", 0);
-        }
-        if (args.IsArgSet("-signet_seednode")) {
-            vSeeds = gArgs.GetArgs("-signet_seednode");
-        }
+            if (args.IsArgSet("-signet_seednode")) {
+                vSeeds = gArgs.GetArgs("-signet_seednode");
+            }
 
-        LogPrintf("SigNet with block script %s\n", gArgs.GetArgs("-signet_blockscript")[0]);
+            LogPrintf("SigNet with block script %s\n", gArgs.GetArgs("-signet_blockscript")[0]);
+        }
 
         strNetworkID = "signet";
         consensus.signet_blocks = true;

From cb19873222718a18b815443e66900158fa6f2949 Mon Sep 17 00:00:00 2001
From: Karl-Johan Alm <karljohan-alm@garage.co.jp>
Date: Fri, 19 Jul 2019 14:04:28 +0900
Subject: [PATCH 22/31] util_ChainMerge, ChainMergeTestingSetup shasum update

---
 src/test/util_tests.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
index d0cd4b0a03d2d..36a935b79713b 100644
--- a/src/test/util_tests.cpp
+++ b/src/test/util_tests.cpp
@@ -913,7 +913,7 @@ BOOST_FIXTURE_TEST_CASE(util_ChainMerge, ChainMergeTestingSetup)
     // Results file is formatted like:
     //
     //   <input> || <output>
-    BOOST_CHECK_EQUAL(out_sha_hex, "94b4ad55c8ac639a56b93e36f7e32e4c611fd7d7dd7b2be6a71707b1eadcaec7");
+    BOOST_CHECK_EQUAL(out_sha_hex, "c6856c9f644482552b3c78ae3d5bcfeb51983de918606c564bffafac61d09d1d");
 }
 
 BOOST_AUTO_TEST_CASE(util_FormatMoney)

From f85ad5ff030cf28255172d4770b2b1e295d53de2 Mon Sep 17 00:00:00 2001
From: Karl-Johan Alm <karljohan-alm@garage.co.jp>
Date: Fri, 23 Aug 2019 14:01:45 +0900
Subject: [PATCH 23/31] rpc/signet: show signet blockscript in
 'getblockchaininfo'

---
 src/rpc/blockchain.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp
index d1197ea13e374..4aab56b6cf3f0 100644
--- a/src/rpc/blockchain.cpp
+++ b/src/rpc/blockchain.cpp
@@ -1277,6 +1277,9 @@ UniValue getblockchaininfo(const JSONRPCRequest& request)
     }
 
     const Consensus::Params& consensusParams = Params().GetConsensus();
+    if (consensusParams.signet_blocks) {
+        obj.pushKV("signet-blockscript", HexStr(g_signet_blockscript));
+    }
     UniValue softforks(UniValue::VOBJ);
     BuriedForkDescPushBack(softforks, "bip34", consensusParams.BIP34Height);
     BuriedForkDescPushBack(softforks, "bip66", consensusParams.BIP66Height);

From 06f7df81c7efaca47779674fc51deb1050170d08 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jorge=20Tim=C3=B3n?= <jtimon@jtimon.cc>
Date: Sat, 7 Sep 2019 22:14:07 +0200
Subject: [PATCH 24/31] nit: death code

---
 src/chainparams.cpp | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 2696c4f044dd7..aa9fbed72b7d7 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -280,9 +280,6 @@ class SigNetParams : public CChainParams {
             vSeeds.push_back("2a01:7c8:d005:390::5");
             vSeeds.push_back("ntv3mtqw5wt63red.onion:38333");
         } else {
-            if (!args.IsArgSet("-signet_blockscript")) {
-                throw std::runtime_error(strprintf("%s: -signet_blockscript is mandatory for signet networks", __func__));
-            }
             if (args.GetArgs("-signet_blockscript").size() != 1) {
                 throw std::runtime_error(strprintf("%s: -signet_blockscript cannot be multiple values.", __func__));
             }

From 224f578a3e0ff1370c0223f651d519f3612e6355 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jorge=20Tim=C3=B3n?= <jtimon@jtimon.cc>
Date: Sat, 7 Sep 2019 23:37:08 +0200
Subject: [PATCH 25/31] nit: consensus.signet_blocks = false in the other
 chains

---
 src/chainparams.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index aa9fbed72b7d7..b985c90ceca07 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -92,6 +92,7 @@ class CMainParams : public CChainParams {
         consensus.nPowTargetSpacing = 10 * 60;
         consensus.fPowAllowMinDifficultyBlocks = false;
         consensus.fPowNoRetargeting = false;
+        consensus.signet_blocks = false;
         consensus.nRuleChangeActivationThreshold = 1916; // 95% of 2016
         consensus.nMinerConfirmationWindow = 2016; // nPowTargetTimespan / nPowTargetSpacing
         consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;
@@ -198,6 +199,7 @@ class CTestNetParams : public CChainParams {
         consensus.nPowTargetSpacing = 10 * 60;
         consensus.fPowAllowMinDifficultyBlocks = true;
         consensus.fPowNoRetargeting = false;
+        consensus.signet_blocks = false;
         consensus.nRuleChangeActivationThreshold = 1512; // 75% for testchains
         consensus.nMinerConfirmationWindow = 2016; // nPowTargetTimespan / nPowTargetSpacing
         consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;
@@ -369,6 +371,7 @@ class CRegTestParams : public CChainParams {
         consensus.nPowTargetSpacing = 10 * 60;
         consensus.fPowAllowMinDifficultyBlocks = true;
         consensus.fPowNoRetargeting = true;
+        consensus.signet_blocks = false;
         consensus.nRuleChangeActivationThreshold = 108; // 75% for testchains
         consensus.nMinerConfirmationWindow = 144; // Faster than normal for regtest (144 instead of 2016)
         consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;

From 2dea40443d39f5f5d77b2398a125b147057d0d1d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jorge=20Tim=C3=B3n?= <jtimon@jtimon.cc>
Date: Sun, 8 Sep 2019 04:05:41 +0200
Subject: [PATCH 26/31] nit: moveonly: easier to make CreateSignetGenesisBlock
 static in the future

---
 src/chainparams.cpp | 20 +++++++-------------
 1 file changed, 7 insertions(+), 13 deletions(-)

diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index b985c90ceca07..74fd155fd5fdf 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -40,10 +40,14 @@ static CBlock CreateGenesisBlock(const CScript& coinbase_sig, const CScript& gen
     return genesis;
 }
 
-static CBlock CreateGenesisBlock(const char* pszTimestamp, const CScript& genesisOutputScript, uint32_t nTime, uint32_t nNonce, uint32_t nBits, int32_t nVersion, const CAmount& genesisReward)
+CBlock CreateSignetGenesisBlock(const CScript& block_script, uint32_t block_nonce)
 {
-    CScript coinbase_sig = CScript() << 486604799 << CScriptNum(4) << std::vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
-    return CreateGenesisBlock(coinbase_sig, genesisOutputScript, nTime, nNonce, nBits, nVersion, genesisReward);
+    CHashWriter h(SER_DISK, 0);
+    h << block_script;
+    uint256 hash = h.GetHash();
+    CScript coinbase_sig = CScript() << std::vector<uint8_t>(hash.begin(), hash.end());
+    CScript genesis_out = CScript() << OP_RETURN;
+    return CreateGenesisBlock(coinbase_sig, genesis_out, 1534313275, block_nonce, 0x1e2adc28, 1, 50 * COIN);
 }
 
 /**
@@ -583,13 +587,3 @@ void SelectParams(const std::string& network)
     SelectBaseParams(network);
     globalChainParams = CreateChainParams(network);
 }
-
-CBlock CreateSignetGenesisBlock(const CScript& block_script, uint32_t block_nonce)
-{
-    CHashWriter h(SER_DISK, 0);
-    h << block_script;
-    uint256 hash = h.GetHash();
-    CScript coinbase_sig = CScript() << std::vector<uint8_t>(hash.begin(), hash.end());
-    CScript genesis_out = CScript() << OP_RETURN;
-    return CreateGenesisBlock(coinbase_sig, genesis_out, 1534313275, block_nonce, 0x1e2adc28, 1, 50 * COIN);
-}

From 322dbe11048cfff4275163d6595e6cc22a5f085d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jorge=20Tim=C3=B3n?= <jtimon@jtimon.cc>
Date: Sun, 8 Sep 2019 00:53:28 +0200
Subject: [PATCH 27/31] nit: SigNetParams: set each default value independently

(except for the default seeds)
---
 src/chainparams.cpp | 30 +++++++++++-------------------
 1 file changed, 11 insertions(+), 19 deletions(-)

diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 74fd155fd5fdf..be1d1c471c6e2 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -274,33 +274,25 @@ class CTestNetParams : public CChainParams {
 class SigNetParams : public CChainParams {
 public:
     SigNetParams(const ArgsManager& args) {
-        std::vector<uint8_t> bin;
-        vSeeds.clear();
-        uint32_t genesis_nonce = 0;
 
-        if (!args.IsArgSet("-signet_blockscript")) {
-            LogPrintf("Using default signet network\n");
-            bin = ParseHex("512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be43051ae");
-            genesis_nonce = 621297;
+        vSeeds.clear();
+        if (args.IsArgSet("-signet_seednode")) {
+            vSeeds = gArgs.GetArgs("-signet_seednode");
+        } else if (!args.IsArgSet("-signet_blockscript")) {
+            LogPrintf("Using default signet network seeds\n");
             vSeeds.push_back("178.128.221.177");
             vSeeds.push_back("2a01:7c8:d005:390::5");
             vSeeds.push_back("ntv3mtqw5wt63red.onion:38333");
-        } else {
-            if (args.GetArgs("-signet_blockscript").size() != 1) {
-                throw std::runtime_error(strprintf("%s: -signet_blockscript cannot be multiple values.", __func__));
-            }
-            bin = ParseHex(args.GetArgs("-signet_blockscript")[0]);
-            genesis_nonce = args.GetArg("-signet_genesisnonce", 0);
-            if (args.IsArgSet("-signet_seednode")) {
-                vSeeds = gArgs.GetArgs("-signet_seednode");
-            }
-
-            LogPrintf("SigNet with block script %s\n", gArgs.GetArgs("-signet_blockscript")[0]);
         }
 
+        const uint32_t genesis_nonce = args.GetArg("-signet_genesisnonce", 621297);
+        const std::string signet_blockscript_str = args.GetArg("-signet_blockscript", "512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be43051ae");
+        LogPrintf("SigNet with block script %s\n", signet_blockscript_str);
+        std::vector<uint8_t> bin = ParseHex(signet_blockscript_str);
+        g_signet_blockscript = CScript(bin.begin(), bin.end());
+
         strNetworkID = "signet";
         consensus.signet_blocks = true;
-        g_signet_blockscript = CScript(bin.begin(), bin.end());
         consensus.nSubsidyHalvingInterval = 210000;
         consensus.BIP34Height = 1;
         consensus.BIP65Height = 1;

From fc93444794c6d2c54d50ab7ff0fd497b1f0abf5c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jorge=20Tim=C3=B3n?= <jtimon@jtimon.cc>
Date: Sat, 7 Sep 2019 23:19:03 +0200
Subject: [PATCH 28/31] nit: no need to grind genesis blocks

...which are not only valid by definition but are also a consensus
rule for their own chain
---
 src/chainparams.cpp              |  5 ++---
 src/chainparams.h                |  5 -----
 src/chainparamsbase.cpp          |  1 -
 src/rpc/mining.cpp               | 18 +++---------------
 test/functional/mining_signet.py |  3 +--
 5 files changed, 6 insertions(+), 26 deletions(-)

diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index be1d1c471c6e2..1bdf10cef5a3d 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -40,7 +40,7 @@ static CBlock CreateGenesisBlock(const CScript& coinbase_sig, const CScript& gen
     return genesis;
 }
 
-CBlock CreateSignetGenesisBlock(const CScript& block_script, uint32_t block_nonce)
+static CBlock CreateSignetGenesisBlock(const CScript& block_script, uint32_t block_nonce)
 {
     CHashWriter h(SER_DISK, 0);
     h << block_script;
@@ -285,7 +285,6 @@ class SigNetParams : public CChainParams {
             vSeeds.push_back("ntv3mtqw5wt63red.onion:38333");
         }
 
-        const uint32_t genesis_nonce = args.GetArg("-signet_genesisnonce", 621297);
         const std::string signet_blockscript_str = args.GetArg("-signet_blockscript", "512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be43051ae");
         LogPrintf("SigNet with block script %s\n", signet_blockscript_str);
         std::vector<uint8_t> bin = ParseHex(signet_blockscript_str);
@@ -317,7 +316,7 @@ class SigNetParams : public CChainParams {
         nDefaultPort = 38333;
         nPruneAfterHeight = 1000;
 
-        genesis = CreateSignetGenesisBlock(g_signet_blockscript, genesis_nonce);
+        genesis = CreateSignetGenesisBlock(g_signet_blockscript, 621297);
         consensus.hashGenesisBlock = genesis.GetHash();
 
         // Now that genesis block has been generated, we check if there is an enforcescript, and switch
diff --git a/src/chainparams.h b/src/chainparams.h
index aa87de345781d..8f1d27e03cd95 100644
--- a/src/chainparams.h
+++ b/src/chainparams.h
@@ -125,9 +125,4 @@ const CChainParams &Params();
  */
 void SelectParams(const std::string& chain);
 
-/**
- * Create a Signet genesis block for the given block script/nonce.
- */
-CBlock CreateSignetGenesisBlock(const CScript& block_script, uint32_t block_nonce=0);
-
 #endif // BITCOIN_CHAINPARAMS_H
diff --git a/src/chainparamsbase.cpp b/src/chainparamsbase.cpp
index 7fdae8b6079b0..9a74dcc888d85 100644
--- a/src/chainparamsbase.cpp
+++ b/src/chainparamsbase.cpp
@@ -24,7 +24,6 @@ void SetupChainParamsBaseOptions()
     gArgs.AddArg("-testnet", "Use the test chain. Equivalent to -chain=test.", ArgsManager::ALLOW_ANY, OptionsCategory::CHAINPARAMS);
     gArgs.AddArg("-signet", "Use the signet chain. Note that the network is defined by the signet_blockscript parameter", ArgsManager::ALLOW_ANY, OptionsCategory::CHAINPARAMS);
     gArgs.AddArg("-signet_blockscript", "Blocks must satisfy the given script to be considered valid (only for -signet networks)", ArgsManager::ALLOW_STRING, OptionsCategory::CHAINPARAMS);
-    gArgs.AddArg("-signet_genesisnonce", "Nonce value for use in genesis block to satisfy proof of work requirement", ArgsManager::ALLOW_INT, OptionsCategory::CHAINPARAMS);
     gArgs.AddArg("-signet_enforcescript", "Blocks must satisfy the given script to be considered valid (this replaces -signet_blockscript, and is used for opt-in-reorg mode)", ArgsManager::ALLOW_STRING, OptionsCategory::CHAINPARAMS);
     gArgs.AddArg("-signet_seednode", "Specify a seed node for the signet network (may be used multiple times to specify multiple seed nodes)", ArgsManager::ALLOW_STRING, OptionsCategory::CHAINPARAMS);
     gArgs.AddArg("-vbparams=deployment:start:end", "Use given start/end times for specified version bits deployment (regtest or custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp
index eb334c01d43bc..6665814eee494 100644
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -100,7 +100,7 @@ static UniValue getnetworkhashps(const JSONRPCRequest& request)
     return GetNetworkHashPS(!request.params[0].isNull() ? request.params[0].get_int() : 120, !request.params[1].isNull() ? request.params[1].get_int() : -1);
 }
 
-static bool grindBlock(CBlock* pblock, uint64_t& nMaxTries, uint256& result, bool grind_only=false)
+static bool grindBlock(CBlock* pblock, uint64_t& nMaxTries, uint256& result)
 {
     while (nMaxTries > 0 && pblock->nNonce < std::numeric_limits<uint32_t>::max() && !CheckProofOfWork(pblock->GetHash(), pblock->nBits, Params().GetConsensus()) && !ShutdownRequested()) {
         ++pblock->nNonce;
@@ -111,7 +111,6 @@ static bool grindBlock(CBlock* pblock, uint64_t& nMaxTries, uint256& result, boo
     }
     if (!CheckProofOfWork(pblock->GetHash(), pblock->nBits, Params().GetConsensus())) return false;
     result = pblock->GetHash();
-    if (grind_only) return true;
     std::shared_ptr<const CBlock> shared_pblock = std::make_shared<const CBlock>(*pblock);
     if (!ProcessNewBlock(Params(), shared_pblock, true, nullptr)) {
         throw JSONRPCError(RPC_INTERNAL_ERROR, "ProcessNewBlock, block not accepted");
@@ -1016,26 +1015,20 @@ static UniValue grindblock(const JSONRPCRequest& request)
         "\nGrind the given signet block to find valid proof of work\n"
         "May fail if it reaches maxtries attempts.\n",
         {
-            {"blockhex", RPCArg::Type::STR, RPCArg::Optional::NO, "The block data, or a script challenge, for new Signet networks"},
+            {"blockhex", RPCArg::Type::STR, RPCArg::Optional::NO, "The block data."},
             {"maxtries", RPCArg::Type::NUM, /* default */ "1000000", "How many iterations to try."},
         },
         {
             RPCResult{"for block data",
                 "blockhash     (hex) resulting block hash, or null if none was found\n"
             },
-            RPCResult{"for script challenge",
-                "nonce         (number) resulting nonce value which satisfies the proof of work requirement"
-            },
         },
         RPCExamples{
             "\nGrind a block with hex $blockhex\n"
             + HelpExampleCli("grindblock", "$blockhex")
-            + "\nCreate a new signet network with challenge 512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be43051ae\n"
-            + HelpExampleCli("grindblock", "512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be43051ae")
         },
     }.Check(request);
 
-    bool grinding_nonce = false;
     CBlock block;
     if (DecodeHexBlk(block, request.params[0].get_str())) {
         if (!Params().GetConsensus().signet_blocks) {
@@ -1046,17 +1039,12 @@ static UniValue grindblock(const JSONRPCRequest& request)
         if (!block.GetWitnessCommitmentSection(SIGNET_HEADER, signet_commitment)) {
             throw JSONRPCError(RPC_INVALID_PARAMETER, "Block has no signet commitment; please sign it first");
         }
-    } else {
-        auto bin = ParseHexV(request.params[0], "challenge");
-        block = CreateSignetGenesisBlock(CScript(bin.begin(), bin.end()));
-        grinding_nonce = true;
     }
 
     uint64_t max_tries = request.params[1].isNull() ? 1000000 : request.params[1].get_int();
     uint256 result;
     while (max_tries > 0 && !ShutdownRequested()) {
-        if (grindBlock(&block, max_tries, result, grinding_nonce)) {
-            if (grinding_nonce) return (uint64_t)block.nNonce;
+        if (grindBlock(&block, max_tries, result)) {
             return result.GetHex();
         }
         if (max_tries == 0) break;
diff --git a/test/functional/mining_signet.py b/test/functional/mining_signet.py
index 913b27b0210eb..d36da4295b92c 100755
--- a/test/functional/mining_signet.py
+++ b/test/functional/mining_signet.py
@@ -25,7 +25,6 @@
 pubkey       = "02c72b24ae2ee333f2da24aea66ce4338c01db8f26d0cc96f586d77edcb5238a4f"
 address      = "sb1qghzjzc0jvkjvvvymxnadmjjpu2tywmvagduwfj"
 blockscript  = "5121" + pubkey + "51ae" # 1-of-1 multisig
-genesisnonce = 405557
 
 def assert_template(node, block, expect, rehash=True):
     if rehash:
@@ -39,7 +38,7 @@ def set_test_params(self):
         self.chain = "signet"
         self.num_nodes = 2
         self.setup_clean_chain = True
-        shared_args = ["-signet_blockscript=" + blockscript, "-signet_genesisnonce=" + str(genesisnonce), "-signet_seednode=localhost:1234"]
+        shared_args = ["-signet_blockscript=" + blockscript, "-signet_seednode=localhost:1234"]
         self.extra_args = [shared_args, shared_args]
 
     def skip_test_if_missing_module(self):

From 60f6b14be9fa5e217ed61ea47a14061b7ffb14b6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jorge=20Tim=C3=B3n?= <jtimon@jtimon.cc>
Date: Sun, 8 Sep 2019 02:54:58 +0200
Subject: [PATCH 29/31] proposal: signet restart (hash chain name too)

---
 src/chainparams.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 1bdf10cef5a3d..c51e9a5bb2a98 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -40,9 +40,10 @@ static CBlock CreateGenesisBlock(const CScript& coinbase_sig, const CScript& gen
     return genesis;
 }
 
-static CBlock CreateSignetGenesisBlock(const CScript& block_script, uint32_t block_nonce)
+static CBlock CreateSignetGenesisBlock(const std::string& chain_name, const CScript& block_script, uint32_t block_nonce)
 {
     CHashWriter h(SER_DISK, 0);
+    h << chain_name;
     h << block_script;
     uint256 hash = h.GetHash();
     CScript coinbase_sig = CScript() << std::vector<uint8_t>(hash.begin(), hash.end());
@@ -316,7 +317,7 @@ class SigNetParams : public CChainParams {
         nDefaultPort = 38333;
         nPruneAfterHeight = 1000;
 
-        genesis = CreateSignetGenesisBlock(g_signet_blockscript, 621297);
+        genesis = CreateSignetGenesisBlock(strNetworkID, g_signet_blockscript, 621297);
         consensus.hashGenesisBlock = genesis.GetHash();
 
         // Now that genesis block has been generated, we check if there is an enforcescript, and switch

From 3ee45c12311a5b5d65ccba702604b5349c90cdb1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jorge=20Tim=C3=B3n?= <jtimon@jtimon.cc>
Date: Sat, 7 Sep 2019 22:37:34 +0200
Subject: [PATCH 30/31] -signet for the default signet, custom ones with
 -chain=anything

ie custom signets are still covered with any other value for -chain

Support signet networks within custom

An alternative config file for a rebooted signet could be:

chain=signet2
[signet2]
con_signet_blocks=1
signet_blockscript=512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be43051ae
seednode=178.128.221.177
seednode=2a01:7c8:d005:390::5
seednode=ntv3mtqw5wt63red.onion:38333
---
 src/chainparams.cpp              | 36 ++++++++++++++++++++++----------
 src/chainparamsbase.cpp          |  7 +++----
 test/functional/mining_signet.py |  4 ++--
 3 files changed, 30 insertions(+), 17 deletions(-)

diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index c51e9a5bb2a98..07c3a2cb8ca09 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -276,18 +276,12 @@ class SigNetParams : public CChainParams {
 public:
     SigNetParams(const ArgsManager& args) {
 
+        const std::string signet_blockscript_str = "512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be43051ae";
+        LogPrintf("Using default signet network (script: %s)\n", signet_blockscript_str);
         vSeeds.clear();
-        if (args.IsArgSet("-signet_seednode")) {
-            vSeeds = gArgs.GetArgs("-signet_seednode");
-        } else if (!args.IsArgSet("-signet_blockscript")) {
-            LogPrintf("Using default signet network seeds\n");
-            vSeeds.push_back("178.128.221.177");
-            vSeeds.push_back("2a01:7c8:d005:390::5");
-            vSeeds.push_back("ntv3mtqw5wt63red.onion:38333");
-        }
-
-        const std::string signet_blockscript_str = args.GetArg("-signet_blockscript", "512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be43051ae");
-        LogPrintf("SigNet with block script %s\n", signet_blockscript_str);
+        vSeeds.emplace_back("178.128.221.177");
+        vSeeds.emplace_back("2a01:7c8:d005:390::5");
+        vSeeds.emplace_back("ntv3mtqw5wt63red.onion:38333");
         std::vector<uint8_t> bin = ParseHex(signet_blockscript_str);
         g_signet_blockscript = CScript(bin.begin(), bin.end());
 
@@ -486,6 +480,12 @@ class CCustomParams : public CRegTestParams {
     {
         UpdateActivationParametersFromArgs(args);
 
+        consensus.signet_blocks = args.IsArgSet("-signet_blockscript");
+        const std::string signet_script_str = gArgs.GetArg("-signet_blockscript", "");
+        LogPrintf("SigNet=%s with block script %s\n", consensus.signet_blocks, signet_script_str);
+        std::vector<uint8_t> signet_script_bytes = ParseHex(signet_script_str);
+        g_signet_blockscript = CScript(signet_script_bytes.begin(), signet_script_bytes.end());
+
         consensus.nSubsidyHalvingInterval = args.GetArg("-con_nsubsidyhalvinginterval", consensus.nSubsidyHalvingInterval);
         consensus.BIP16Exception = uint256S(args.GetArg("-con_bip16exception", "0x0"));
         consensus.BIP34Height = args.GetArg("-con_bip34height", consensus.BIP34Height);
@@ -546,8 +546,22 @@ class CCustomParams : public CRegTestParams {
 
         CHashWriter h(SER_DISK, 0);
         h << strNetworkID;
+        if (consensus.signet_blocks) {
+            h << g_signet_blockscript;
+        }
         genesis = CreateGenesisBlockWithHash(h.GetHash());
         consensus.hashGenesisBlock = genesis.GetHash();
+
+        // Now that genesis block has been generated, we check if there is an enforcescript, and switch
+        // to that one, as we will not be using the real block script anymore
+        if (args.IsArgSet("-signet_enforcescript")) {
+            if (args.GetArgs("-signet_enforcescript").size() != 1) {
+                throw std::runtime_error(strprintf("%s: -signet_enforcescript cannot be multiple values.", __func__));
+            }
+            const std::vector<uint8_t> bin = ParseHex(args.GetArgs("-signet_enforcescript")[0]);
+            g_signet_blockscript = CScript(bin.begin(), bin.end());
+            LogPrintf("SigNet enforce script %s\n", gArgs.GetArgs("-signet_enforcescript")[0]);
+        }
     }
 };
 
diff --git a/src/chainparamsbase.cpp b/src/chainparamsbase.cpp
index 9a74dcc888d85..baf2b937313b4 100644
--- a/src/chainparamsbase.cpp
+++ b/src/chainparamsbase.cpp
@@ -22,10 +22,9 @@ void SetupChainParamsBaseOptions()
     gArgs.AddArg("-regtest", "Enter regression test mode, which uses a special chain in which blocks can be solved instantly. "
                  "This is intended for regression testing tools and app development. Equivalent to -chain=regtest.", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
     gArgs.AddArg("-testnet", "Use the test chain. Equivalent to -chain=test.", ArgsManager::ALLOW_ANY, OptionsCategory::CHAINPARAMS);
-    gArgs.AddArg("-signet", "Use the signet chain. Note that the network is defined by the signet_blockscript parameter", ArgsManager::ALLOW_ANY, OptionsCategory::CHAINPARAMS);
-    gArgs.AddArg("-signet_blockscript", "Blocks must satisfy the given script to be considered valid (only for -signet networks)", ArgsManager::ALLOW_STRING, OptionsCategory::CHAINPARAMS);
-    gArgs.AddArg("-signet_enforcescript", "Blocks must satisfy the given script to be considered valid (this replaces -signet_blockscript, and is used for opt-in-reorg mode)", ArgsManager::ALLOW_STRING, OptionsCategory::CHAINPARAMS);
-    gArgs.AddArg("-signet_seednode", "Specify a seed node for the signet network (may be used multiple times to specify multiple seed nodes)", ArgsManager::ALLOW_STRING, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-signet", "Use the default signet chain. Note that the network is defined by the signet_blockscript parameter. equivalent to -chain=signet.", ArgsManager::ALLOW_ANY, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-signet_blockscript", "Blocks must satisfy the given script to be considered valid. If not set, the chain is not considered a signet chain. (custom only)", ArgsManager::ALLOW_STRING, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-signet_enforcescript", "Blocks must satisfy the given script to be considered valid (this replaces -signet_blockscript, and is used for opt-in-reorg mode, custom or signet only)", ArgsManager::ALLOW_STRING, OptionsCategory::CHAINPARAMS);
     gArgs.AddArg("-vbparams=deployment:start:end", "Use given start/end times for specified version bits deployment (regtest or custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
     gArgs.AddArg("-segwitheight=<n>", "Set the activation height of segwit. -1 to disable. (regtest or custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::DEBUG_TEST);
     gArgs.AddArg("-con_nsubsidyhalvinginterval", "Number of blocks between one subsidy adjustment and the next one. Default: 150 (custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
diff --git a/test/functional/mining_signet.py b/test/functional/mining_signet.py
index d36da4295b92c..d205b5c5c58af 100755
--- a/test/functional/mining_signet.py
+++ b/test/functional/mining_signet.py
@@ -35,10 +35,10 @@ def assert_template(node, block, expect, rehash=True):
 
 class SigMiningTest(BitcoinTestFramework):
     def set_test_params(self):
-        self.chain = "signet"
         self.num_nodes = 2
         self.setup_clean_chain = True
-        shared_args = ["-signet_blockscript=" + blockscript, "-signet_seednode=localhost:1234"]
+        shared_args = ["-signet_blockscript=" + blockscript, "-seednode=localhost:1234", "-pubkeyprefix=125",
+                       "-scriptprefix=87", "-secretprefix=217", "-bech32_hrp=sb"]
         self.extra_args = [shared_args, shared_args]
 
     def skip_test_if_missing_module(self):

From d5285911c35ff68b3506b7a6f9504c96ad8eada7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jorge=20Tim=C3=B3n?= <jtimon@jtimon.cc>
Date: Sun, 8 Sep 2019 03:03:20 +0200
Subject: [PATCH 31/31] UNDO: Remove SigNetParams for being a special case

signet chains, including the default can be just a concrete cases in custom chains
For example:

chain=signet
[signet]
con_signet_blocks=1
signet_blockscript=512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be43051ae
seednode=178.128.221.177
seednode=2a01:7c8:d005:390::5
seednode=ntv3mtqw5wt63red.onion:38333
---
 src/chainparams.cpp     | 86 -----------------------------------------
 src/chainparamsbase.cpp |  4 --
 src/chainparamsbase.h   |  1 -
 src/test/util_tests.cpp |  2 +-
 src/util/system.cpp     |  9 ++---
 5 files changed, 4 insertions(+), 98 deletions(-)

diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 07c3a2cb8ca09..65e7435a4045a 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -40,17 +40,6 @@ static CBlock CreateGenesisBlock(const CScript& coinbase_sig, const CScript& gen
     return genesis;
 }
 
-static CBlock CreateSignetGenesisBlock(const std::string& chain_name, const CScript& block_script, uint32_t block_nonce)
-{
-    CHashWriter h(SER_DISK, 0);
-    h << chain_name;
-    h << block_script;
-    uint256 hash = h.GetHash();
-    CScript coinbase_sig = CScript() << std::vector<uint8_t>(hash.begin(), hash.end());
-    CScript genesis_out = CScript() << OP_RETURN;
-    return CreateGenesisBlock(coinbase_sig, genesis_out, 1534313275, block_nonce, 0x1e2adc28, 1, 50 * COIN);
-}
-
 /**
  * Build the genesis block. Note that the output of its generation
  * transaction cannot be spent since it did not originally exist in the
@@ -269,78 +258,6 @@ class CTestNetParams : public CChainParams {
     }
 };
 
-/**
- * SigNet
- */
-class SigNetParams : public CChainParams {
-public:
-    SigNetParams(const ArgsManager& args) {
-
-        const std::string signet_blockscript_str = "512103ad5e0edad18cb1f0fc0d28a3d4f1f3e445640337489abb10404f2d1e086be43051ae";
-        LogPrintf("Using default signet network (script: %s)\n", signet_blockscript_str);
-        vSeeds.clear();
-        vSeeds.emplace_back("178.128.221.177");
-        vSeeds.emplace_back("2a01:7c8:d005:390::5");
-        vSeeds.emplace_back("ntv3mtqw5wt63red.onion:38333");
-        std::vector<uint8_t> bin = ParseHex(signet_blockscript_str);
-        g_signet_blockscript = CScript(bin.begin(), bin.end());
-
-        strNetworkID = "signet";
-        consensus.signet_blocks = true;
-        consensus.nSubsidyHalvingInterval = 210000;
-        consensus.BIP34Height = 1;
-        consensus.BIP65Height = 1;
-        consensus.BIP66Height = 1;
-        consensus.CSVHeight = 0;
-        consensus.SegwitHeight = 0;
-        consensus.nPowTargetTimespan = 14 * 24 * 60 * 60; // two weeks
-        consensus.nPowTargetSpacing = 10 * 60;
-        consensus.fPowAllowMinDifficultyBlocks = false;
-        consensus.fPowNoRetargeting = false;
-        consensus.nRuleChangeActivationThreshold = 1916;
-        consensus.nMinerConfirmationWindow = 2016;
-        consensus.powLimit = uint256S("00002adc28cf53b63c82faa55d83e40ac63b5f100aa5d8df62a429192f9e8ce5");
-        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;
-        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nStartTime = 1539478800;
-        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
-
-        pchMessageStart[0] = 0xf0;
-        pchMessageStart[1] = 0xc7;
-        pchMessageStart[2] = 0x70;
-        pchMessageStart[3] = 0x6a;
-        nDefaultPort = 38333;
-        nPruneAfterHeight = 1000;
-
-        genesis = CreateSignetGenesisBlock(strNetworkID, g_signet_blockscript, 621297);
-        consensus.hashGenesisBlock = genesis.GetHash();
-
-        // Now that genesis block has been generated, we check if there is an enforcescript, and switch
-        // to that one, as we will not be using the real block script anymore
-        if (args.IsArgSet("-signet_enforcescript")) {
-            if (args.GetArgs("-signet_enforcescript").size() != 1) {
-                throw std::runtime_error(strprintf("%s: -signet_enforcescript cannot be multiple values.", __func__));
-            }
-            bin = ParseHex(args.GetArgs("-signet_enforcescript")[0]);
-            g_signet_blockscript = CScript(bin.begin(), bin.end());
-            LogPrintf("SigNet enforce script %s\n", gArgs.GetArgs("-signet_enforcescript")[0]);
-        }
-
-        vFixedSeeds.clear();
-
-        base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>{125};
-        base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>{87};
-        base58Prefixes[SECRET_KEY] =     std::vector<unsigned char>{217};
-        base58Prefixes[EXT_PUBLIC_KEY] = {0x04, 0x35, 0x87, 0xCF};
-        base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x35, 0x83, 0x94};
-
-        bech32_hrp = "sb";
-
-        fDefaultConsistencyChecks = false;
-        fRequireStandard = true;
-        m_is_test_chain = true;
-    }
-};
-
 /**
  * Regression test
  */
@@ -581,9 +498,6 @@ std::unique_ptr<const CChainParams> CreateChainParams(const std::string& chain)
         return std::unique_ptr<CChainParams>(new CTestNetParams());
     else if (chain == CBaseChainParams::REGTEST)
         return std::unique_ptr<CChainParams>(new CRegTestParams(gArgs));
-    else if (chain == CBaseChainParams::SIGNET) {
-        return std::unique_ptr<CChainParams>(new SigNetParams(gArgs));
-    }
 
     return std::unique_ptr<CChainParams>(new CCustomParams(chain, gArgs));
 }
diff --git a/src/chainparamsbase.cpp b/src/chainparamsbase.cpp
index baf2b937313b4..e8253a9465ca7 100644
--- a/src/chainparamsbase.cpp
+++ b/src/chainparamsbase.cpp
@@ -13,7 +13,6 @@
 
 const std::string CBaseChainParams::MAIN = "main";
 const std::string CBaseChainParams::TESTNET = "test";
-const std::string CBaseChainParams::SIGNET = "signet";
 const std::string CBaseChainParams::REGTEST = "regtest";
 
 void SetupChainParamsBaseOptions()
@@ -22,7 +21,6 @@ void SetupChainParamsBaseOptions()
     gArgs.AddArg("-regtest", "Enter regression test mode, which uses a special chain in which blocks can be solved instantly. "
                  "This is intended for regression testing tools and app development. Equivalent to -chain=regtest.", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
     gArgs.AddArg("-testnet", "Use the test chain. Equivalent to -chain=test.", ArgsManager::ALLOW_ANY, OptionsCategory::CHAINPARAMS);
-    gArgs.AddArg("-signet", "Use the default signet chain. Note that the network is defined by the signet_blockscript parameter. equivalent to -chain=signet.", ArgsManager::ALLOW_ANY, OptionsCategory::CHAINPARAMS);
     gArgs.AddArg("-signet_blockscript", "Blocks must satisfy the given script to be considered valid. If not set, the chain is not considered a signet chain. (custom only)", ArgsManager::ALLOW_STRING, OptionsCategory::CHAINPARAMS);
     gArgs.AddArg("-signet_enforcescript", "Blocks must satisfy the given script to be considered valid (this replaces -signet_blockscript, and is used for opt-in-reorg mode, custom or signet only)", ArgsManager::ALLOW_STRING, OptionsCategory::CHAINPARAMS);
     gArgs.AddArg("-vbparams=deployment:start:end", "Use given start/end times for specified version bits deployment (regtest or custom only)", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::CHAINPARAMS);
@@ -75,8 +73,6 @@ std::unique_ptr<CBaseChainParams> CreateBaseChainParams(const std::string& chain
         return MakeUnique<CBaseChainParams>("testnet3", 18332);
     else if (chain == CBaseChainParams::REGTEST)
         return MakeUnique<CBaseChainParams>("regtest", 18443);
-    else if (chain == CBaseChainParams::SIGNET)
-        return MakeUnique<CBaseChainParams>("signet", 38332);
 
     return MakeUnique<CBaseChainParams>(chain, 18553);
 }
diff --git a/src/chainparamsbase.h b/src/chainparamsbase.h
index 1256ad1107e22..0ba8bdda2b35b 100644
--- a/src/chainparamsbase.h
+++ b/src/chainparamsbase.h
@@ -18,7 +18,6 @@ class CBaseChainParams
     /** BIP70 chain name strings (main, test, signet or regtest) */
     static const std::string MAIN;
     static const std::string TESTNET;
-    static const std::string SIGNET;
     static const std::string REGTEST;
 
     const std::string& DataDir() const { return strDataDir; }
diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
index 36a935b79713b..840146790eb34 100644
--- a/src/test/util_tests.cpp
+++ b/src/test/util_tests.cpp
@@ -913,7 +913,7 @@ BOOST_FIXTURE_TEST_CASE(util_ChainMerge, ChainMergeTestingSetup)
     // Results file is formatted like:
     //
     //   <input> || <output>
-    BOOST_CHECK_EQUAL(out_sha_hex, "c6856c9f644482552b3c78ae3d5bcfeb51983de918606c564bffafac61d09d1d");
+    BOOST_CHECK_EQUAL(out_sha_hex, "40e5f92b19fc43eaa06eae257b366c449c0f3fd57e46894850a54aed785a19fc");
 }
 
 BOOST_AUTO_TEST_CASE(util_FormatMoney)
diff --git a/src/util/system.cpp b/src/util/system.cpp
index ef78c6779421e..93bdfff333e21 100644
--- a/src/util/system.cpp
+++ b/src/util/system.cpp
@@ -941,19 +941,16 @@ std::string ArgsManager::GetChainName() const
     LOCK(cs_args);
     bool fRegTest = ArgsManagerHelper::GetNetBoolArg(*this, "-regtest");
     bool fTestNet = ArgsManagerHelper::GetNetBoolArg(*this, "-testnet");
-    bool signet   = ArgsManagerHelper::GetNetBoolArg(*this, "-signet");
     const bool is_chain_arg_set = IsArgSet("-chain");
 
-    if ((int)is_chain_arg_set + (int)fTestNet + (int)fRegTest + (int)signet > 1) {
-        throw std::runtime_error("Invalid combination of -regtest, -testnet, -signet and -chain. Can use at most one");
+    if ((int)is_chain_arg_set + (int)fTestNet + (int)fRegTest > 1) {
+        throw std::runtime_error("Invalid combination of -regtest, -testnet and -chain. Can use at most one");
     }
     if (fRegTest)
         return CBaseChainParams::REGTEST;
     if (fTestNet)
         return CBaseChainParams::TESTNET;
-    if (signet) {
-        return CBaseChainParams::SIGNET;
-    }
+
     return GetArg("-chain", CBaseChainParams::MAIN);
 }