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</script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/bitcoin-s/bitcoin-s/blob/master/docs/wallet/wallet-sync.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Wallet Sync</h1></header><article><div><span><h2><a class="anchor" aria-hidden="true" id="high-level-wallet-state"></a><a href="#high-level-wallet-state" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>High level wallet state</h2>
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<p>Our wallet infrastructure has a specific table called <code>state_descriptors</code>.
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This tracks chain state for our wallet.
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Here is an example of the contents of this table</p>
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<blockquote>
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<p>sqlite> select * from state_descriptors;
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SyncHeight|0000000000000000000134aa9e949ea1d053042b8dfa59bdc73b0322a88f009e 665741</p>
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</blockquote>
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<p>If you look carefully in the second column, you will see a string encoding indicating
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what the wallet state is. In this case, the last block hash seen by the wallet is</p>
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<blockquote>
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<p>0000000000000000000134aa9e949ea1d053042b8dfa59bdc73b0322a88f009e</p>
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</blockquote>
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<p>and height</p>
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<blockquote>
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<p>665741</p>
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</blockquote>
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<p>If you have access to a wallet, you can call</p>
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<p><a href="https://github.com/bitcoin-s/bitcoin-s/blob/36b5fc142715f8ab3ad053465d53dc29ab319790/wallet/src/main/scala/org/bitcoins/wallet/Wallet.scala#L160"><code>wallet.getSyncDescriptorOpt</code></a> to get access to this information</p>
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<h4><a class="anchor" aria-hidden="true" id="wallet-state-from-the-cli"></a><a href="#wallet-state-from-the-cli" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Wallet state from the cli</h4>
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<p>Alternatively, you can retrieve this information with <code>bitcoin-s-cli</code></p>
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<pre><code class="hljs"> ./<span class="hljs-keyword">bitcoin-s-cli </span>walletinfo
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{
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<span class="hljs-string">"wallet"</span>: {
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<span class="hljs-string">"keymanager"</span>: {
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<span class="hljs-string">"rootXpub"</span>: <span class="hljs-string">"..."</span>
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},
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<span class="hljs-string">"xpub"</span>: <span class="hljs-string">"..."</span>,
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<span class="hljs-string">"hdPath"</span>: <span class="hljs-string">"..."</span>,
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<span class="hljs-string">"height"</span>: <span class="hljs-number">1906239</span>,
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<span class="hljs-string">"blockHash"</span>: <span class="hljs-string">"00000000dcf1066b8cd764a6104a9b5e95a55cd31adf9107974b2581ac90fdb9"</span>
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}
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}
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</code></pre>
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<h2><a class="anchor" aria-hidden="true" id="syncing-a-wallet"></a><a href="#syncing-a-wallet" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Syncing a wallet</h2>
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<p>Bitcoin-s provides a utility object called <a href="https://github.com/bitcoin-s/bitcoin-s/blob/f3e81d027dfdda79e26642d5c29d381874ee72da/wallet/src/main/scala/org/bitcoins/wallet/sync/WalletSync.scala#L10"><code>WalletSync</code></a>
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that provides useful utilities for syncing a bitcoin-s wallet.</p>
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<h3><a class="anchor" aria-hidden="true" id="syncing-wallet-for-with-access-to-full-blocks"></a><a href="#syncing-wallet-for-with-access-to-full-blocks" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Syncing wallet for with access to full blocks</h3>
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<p>Inside of <code>WalletSync</code> we have a method called <a href="https://github.com/bitcoin-s/bitcoin-s/blob/f3e81d027dfdda79e26642d5c29d381874ee72da/wallet/src/main/scala/org/bitcoins/wallet/sync/WalletSync.scala#L18"><code>WalletSync.syncFullBlocks</code></a>
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This method takes 4 parameters</p>
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<ul>
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<li>a <a href="https://github.com/bitcoin-s/bitcoin-s/blob/36b5fc142715f8ab3ad053465d53dc29ab319790/wallet/src/main/scala/org/bitcoins/wallet/Wallet.scala#L46">Wallet</a> to sync</li>
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<li><code>getBlockHeaderFunc</code> is a function to retrieve a block header based on a blockHash</li>
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<li><code>getBestBlockHashFunc</code> is a function to retrieve the best block hash for our blockchain</li>
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<li><code>getBlockFunc</code> is a function to retrieve a full <a href="https://github.com/bitcoin-s/bitcoin-s/blob/8a148357d560a40bf21e7c0e3f4074cd276534fe/core/src/main/scala/org/bitcoins/core/protocol/blockchain/Block.scala#L18"><code>Block</code></a> that corresponds to a block hash</li>
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</ul>
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<p>Given these for things, we can use <a href="https://github.com/bitcoin-s/bitcoin-s/blob/f3e81d027dfdda79e26642d5c29d381874ee72da/wallet/src/main/scala/org/bitcoins/wallet/sync/WalletSync.scala#L18"><code>WalletSync.syncFullBlocks</code></a> to sync our entire wallet.</p>
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<p>Here is a code example</p>
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<pre><code class="hljs css language-scala"><span class="hljs-keyword">implicit</span> <span class="hljs-keyword">val</span> system: <span class="hljs-type">ActorSystem</span> = <span class="hljs-type">ActorSystem</span>(<span class="hljs-string">s"wallet-sync-example"</span>)
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<span class="hljs-keyword">implicit</span> <span class="hljs-keyword">val</span> ec: <span class="hljs-type">ExecutionContext</span> = system.dispatcher
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<span class="hljs-comment">// this reads authentication credentials and</span>
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<span class="hljs-comment">// connection details from the default data</span>
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<span class="hljs-comment">// directory on your platform</span>
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<span class="hljs-keyword">val</span> client = <span class="hljs-type">BitcoindRpcClient</span>.fromDatadir(binary=<span class="hljs-keyword">new</span> <span class="hljs-type">File</span>(<span class="hljs-string">"/path/to/bitcoind"</span>), datadir=<span class="hljs-keyword">new</span> <span class="hljs-type">File</span>(<span class="hljs-string">"/path/to/bitcoind-datadir"</span>))
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<span class="hljs-comment">//yay! Now we have a started bitcoind.</span>
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<span class="hljs-comment">//We will use this as our datasource for syncing our wallet</span>
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<span class="hljs-keyword">val</span> bitcoindRpcClientF: <span class="hljs-type">Future</span>[<span class="hljs-type">BitcoindRpcClient</span>] = client.start()
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<span class="hljs-comment">//wait for bitcoind to get started</span>
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<span class="hljs-keyword">val</span> bitcoind = <span class="hljs-type">Await</span>.result(bitcoindRpcClientF, <span class="hljs-number">10.</span>seconds)
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<span class="hljs-keyword">val</span> getBestBlockHashFunc = () => bitcoind.getBestBlockHash
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<span class="hljs-keyword">val</span> getBlockHeaderFunc = { hash: <span class="hljs-type">DoubleSha256DigestBE</span> => bitcoind.getBlockHeaderRaw(hash) }
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<span class="hljs-keyword">val</span> getBlockFunc = {hash: <span class="hljs-type">DoubleSha256DigestBE</span> => bitcoind.getBlockRaw(hash) }
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<span class="hljs-comment">//yay! We are now all setup. Using our 3 functions above and a wallet, we can now sync</span>
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<span class="hljs-comment">//a fresh wallet</span>
|
||
<span class="hljs-keyword">implicit</span> <span class="hljs-keyword">val</span> walletAppConfig = <span class="hljs-type">WalletAppConfig</span>.fromDefaultDatadir()
|
||
<span class="hljs-keyword">implicit</span> <span class="hljs-keyword">val</span> kmAppConfig = <span class="hljs-type">KeyManagerAppConfig</span>.fromDefaultDatadir()
|
||
<span class="hljs-keyword">val</span> keyManager: <span class="hljs-type">BIP39KeyManager</span> = {
|
||
<span class="hljs-type">BIP39KeyManager</span>.fromParams(walletAppConfig.kmParams,<span class="hljs-type">None</span>,<span class="hljs-type">None</span>).right.get
|
||
}
|
||
<span class="hljs-keyword">val</span> feeRateProvider: <span class="hljs-type">FeeRateApi</span> = <span class="hljs-type">MempoolSpaceProvider</span>.fromBlockTarget(<span class="hljs-number">6</span>)
|
||
<span class="hljs-keyword">val</span> wallet = <span class="hljs-type">Wallet</span>(keyManager, bitcoind, bitcoind, feeRateProvider, keyManager.creationTime)
|
||
|
||
<span class="hljs-comment">//yay! we have a synced wallet</span>
|
||
<span class="hljs-keyword">val</span> syncedWalletF = <span class="hljs-type">WalletSync</span>.syncFullBlocks(wallet,
|
||
getBlockHeaderFunc,
|
||
getBestBlockHashFunc,
|
||
getBlockFunc)
|
||
</code></pre>
|
||
</span></div></article></div><div class="docLastUpdate"><em>Last updated on 1/28/2021 by Chris Stewart</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/wallet/wallet-rescan"><span class="arrow-prev">← </span><span>Wallet Rescans</span></a><a class="docs-next button" href="/docs/rpc/rpc-clients-intro"><span>Introduction</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#high-level-wallet-state">High level wallet state</a></li><li><a href="#syncing-a-wallet">Syncing a wallet</a><ul class="toc-headings"><li><a href="#syncing-wallet-for-with-access-to-full-blocks">Syncing wallet for with access to full blocks</a></li></ul></li></ul></nav></div><footer class="nav-footer" id="footer"><section class="sitemap"><a href="/" class="nav-home"><img src="/img/favicon.ico" alt="bitcoin-s" width="66" height="58"/></a><div><h5>Docs</h5><a href="/docs/en/getting-started">Getting Started</a><a href="/docs/en/core/core-intro">Guides</a><a href="/api/org/bitcoins">API Reference</a></div><div><h5>Community</h5><a href="/en/users.html">User Showcase</a><a href="https://join.slack.com/t/suredbits/shared_invite/zt-eavycu0x-WQL7XOakzQo8tAy7jHHZUw" target="_blank" rel="noreferrer noopener">Slack</a><a href="https://gitter.im/bitcoin-s-core/">Gitter chat</a></div><div><h5>More</h5><a href="https://github.com/bitcoin-s/bitcoin-s">GitHub</a><a class="github-button" href="https://github.com/bitcoin-s/bitcoin-s" data-icon="octicon-star" data-count-href="/bitcoin-s/bitcoin-s-core/stargazers" data-show-count="true" data-count-aria-label="# stargazers on GitHub" aria-label="Star this project on GitHub">Star</a></div></section><section class="copyright">Copyright © 2021 Suredbits & the bitcoin-s developers</section></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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