Update snapshot download docs (#4)

* Update docs

* Add donate

* Remove unused deps

* Update docs

* TODO

* .

Author: liuchengxu

docs/basics/download-UTXO-snapshot.md

@@ -2,16 +2,54 @@
 sidebar_position: 3
 ---
 
-# Download UTXO Snapshot (Coming Soon)
+# Download UTXO Snapshot
 
-Subcoin offers a dedicated tool for downloading a Bitcoin Core-compatible UTXO snapshot from the Subcoin P2P network directly. This eliminates the need for Bitcoin Core users to rely on trusted snapshot providers for performing a fast sync.
+Subcoin offers a dedicated tool `snapcake` for downloading a Bitcoin Core-compatible UTXO snapshot from the Subcoin P2P network directly. This eliminates the need for Bitcoin Core users to rely on trusted snapshot providers for performing a fast sync.
 
-## Tool: `snapcake`
+## Command to Download a UTXO Snapshot
 
-To download the UTXO snapshot, simply use the following command:
+To download the UTXO snapshot for a specified block, simply use the following command:
 
 ```bash
-snapcake
+snapcake --bootnodes <BOOTNODES> --block-number 840000
+```
+
+TODO: public bootnodes
+
+### Notes
+
+- Supported Block:
+
+  While snapcake supports downloading the snapshot at any block as long as the peer does not prune the state, only the UTXO snapshot at hardcoded block height 840000 is currently supported for importing into Bitcoin Core.
+
+- Snapshot Format Compatibility:
+
+  The snapshot format may change in future versions of Bitcoin Core. Currently, snapcake supports the snapshot format used in Bitcoin Core v28.0.
+
+- Snapshot integrity:
+
+    The expected `sha256sum` for the snapshot at block 840000 is:
+
+    ```text
+    dc4bb43d58d6a25e91eae93eb052d72e3318bd98ec62a5d0c11817cefbba177b
+    ```
+    This checksum matches the one documented in the official [Bitcoin Core pull request](https://github.com/bitcoin/bitcoin/pull/28553#issue-1920247340).
+
+## Verify the Downloaded Snapshot
+
+To ensure the integrity of the downloaded snapshot, verify its checksum using the `sha256sum` command:
+
+```bash
+# Replace <path-to-snapshot-file> with the path to your downloaded snapshot.
+# By default, the file is stored at:
+# snapshots/840000_0000000000000000000320283a032748cef8227873ff4872689bf23f1cda83a5/snapshot.dat
+sha256sum <path-to-snapshot-file>
+```
+
+The output should match the expected checksum:
+
+```text
+dc4bb43d58d6a25e91eae93eb052d72e3318bd98ec62a5d0c11817cefbba177b
 ```
 
 ## Using the Snapshot in Bitcoin Core

docusaurus.config.js

@@ -83,7 +83,6 @@ const config = {
                     src: 'img/subcoin-logo.svg',
                 },
                 items: [
-                    {to: '/blog', label: 'Blog', position: 'left'},
                     {
                         type: 'docSidebar',
                         sidebarId: 'tutorialSidebar',
@@ -95,6 +94,7 @@ const config = {
                         label: 'Dev Guide',
                         position: 'left',
                     },
+                    {to: '/blog', label: 'Blog', position: 'left'},
                     {to: '/docs/donate', label: 'Donate', position: 'left'},
                     {
                         href: 'https://github.com/subcoin-project/subcoin',

src/components/HomepageFeatures/index.js

@@ -1,18 +1,9 @@
 import clsx from 'clsx';
 import Heading from '@theme/Heading';
 import styles from './styles.module.css';
+import Link from '@docusaurus/Link';
 
 const FeatureList = [
-    {
-        title: 'Decentralized Fast Sync',
-        Svg: require('@site/static/img/blockchain.svg').default,
-        description: (
-            <>
-                Subcoin enables new Bitcoin participants to quickly sync the latest Bitcoin state in a decentralized manner,
-                achieving the fast sync functionality of Bitcoin Core without depending on a trusted snapshot provider.
-            </>
-        ),
-    },
     {
         title: 'Written in Rust',
         Svg: require('@site/static/img/rust.svg').default,
@@ -33,11 +24,30 @@ const FeatureList = [
             </>
         ),
     },
+    {
+        title: 'Decentralized Fast Sync',
+        Svg: require('@site/static/img/blockchain.svg').default,
+        description: (
+            <>
+                Subcoin node enables new Bitcoin participants to quickly sync the latest Bitcoin state in a decentralized manner,
+                achieving the fast sync functionality of Bitcoin Core without depending on a trusted snapshot provider.
+            </>
+        ),
+    },
+    {
+        title: 'Trustless UTXO Snapshot Provider for Bitcoin Core',
+        Svg: require('@site/static/img/snapshot_provider.svg').default,
+        description: (
+            <>
+                Subcoin provides a dedicated tool <Link to="/docs/basics/download-UTXO-snapshot"> Snapcake </Link> that serves as a trustless UTXO snapshot provider for Bitcoin Core without running a Subcoin node, downloading the Bitcoin state from the Subcoin P2P network and generating a Bitcoin Core-compatible UTXO snapshot which can be directly imported into Bitcoin Core.
+            </>
+        ),
+    },
 ];
 
 function Feature({Svg, title, description}) {
     return (
-        <div className={clsx('col col--4')}>
+        <div className={clsx('col col--6')}>
             <div className="text--center">
                 <Svg className={styles.featureSvg} role="img" />
             </div>