Consensus Cleanup preparation: backport "miner: timelock the coinbase to the mined block's height"#90

Merged

ajtowns merged 14 commits intobitcoin-inquisition:29.xfrom

darosior:202509_inquisition_32155

Dec 21, 2025

Commits on Dec 18, 2025

test: introduce VARINT (de)serialization routines

theStack
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darosior
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test: introduce output amount (de)compression routines

theStack
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darosior
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qa: use a clearer and documented amount error in malleated snapshot
darosior
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qa: correct off-by-one in utxo snapshot fuzz target
darosior
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test util: split up ConnectBlock from MineBlock
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fuzz: sanity check hardcoded snapshot in utxo_snapshot target
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qa: delete one "bad snapshot data" case in feature_assumeutxo.py
darosior
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qa: introduce a MAX_SEQUENCE_NONFINAL constant to the functional test framework
darosior
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qa: timelock coinbase transactions created in functional tests
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contrib: timelock coinbase transactions in signet miner
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qa: timelock coinbase transactions created in fuzz targets
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qa: use prev height as nLockTime for coinbase txs created in unit tests
darosior
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miner: timelock coinbase transactions
darosior
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qa: sanity check mined block have their coinbase timelocked to height
darosior
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