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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-rescan.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Wallet Rescans</h1></header><article><div><span><p>With <a href="https://github.com/bitcoin/bips/blob/master/bip-0157.mediawiki">BIP157</a> you can cache block filters locally to use
later for rescans in the case you need to restore your wallets. Our <a href="/docs/chain/chain">chain</a> project gives us
an API with the ability to query for filters.</p>
<h3><a class="anchor" aria-hidden="true" id="rescan-from-cli"></a><a href="#rescan-from-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>Rescan from CLI</h3>
<p>To execute a rescan from the cli because you are restoring a wallet or it has gotten out of sync is fairly simple.</p>
<p>If you have an empty wallet it can be done by simply calling rescan</p>
<pre><code class="hljs css language-bash">./bitcoin<span class="hljs-_">-s</span>-cli rescan
</code></pre>
<p>If your wallet is not empty then you will need to call it with the force command</p>
<pre><code class="hljs css language-bash">./bitcoin<span class="hljs-_">-s</span>-cli rescan --force
</code></pre>
<p>You can also specify start and stop heights</p>
<pre><code class="hljs css language-bash">./bitcoin<span class="hljs-_">-s</span>-cli rescan --start &lt;start height&gt; --stop &lt;stop height&gt;
</code></pre>
<p>By default, if you do not set the start height, the rescan will begin at your wallet's creation time.
If you wish to ignore this and start from genesis use the <code>ignorecreationtime</code> flag</p>
<pre><code class="hljs css language-bash">./bitcoin<span class="hljs-_">-s</span>-cli rescan --ignorecreationtime
</code></pre>
<h3><a class="anchor" aria-hidden="true" id="code-example"></a><a href="#code-example" 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>Code Example</h3>
<p>You can rescan your wallet with filters with <a href="https://github.com/bitcoin-s/bitcoin-s/blob/master/core/src/main/scala/org/bitcoins/core/api/wallet/NeutrinoWalletApi.scala#L77"><code>WalletApi.rescanNeutrinoWallet()</code></a></p>
<p>To run this example you need to make sure you have access to a bitcoind binary.
You can download this with bitcoin-s by doing <code>sbt downloadBitcoind</code></p>
<pre><code class="hljs css language-scala"><span class="hljs-comment">//we need an actor system and app config to power this</span>
<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-rescan-example"</span>)
<span class="hljs-keyword">implicit</span> <span class="hljs-keyword">val</span> ec: <span class="hljs-type">ExecutionContext</span> = system.dispatcher
<span class="hljs-keyword">implicit</span> <span class="hljs-keyword">val</span> appConfig: <span class="hljs-type">BitcoinSAppConfig</span> = <span class="hljs-type">BitcoinSTestAppConfig</span>.getNeutrinoTestConfig()
<span class="hljs-keyword">implicit</span> <span class="hljs-keyword">val</span> walletAppConfig: <span class="hljs-type">WalletAppConfig</span> = appConfig.walletConf
<span class="hljs-keyword">val</span> bip39PasswordOpt = <span class="hljs-type">None</span>
<span class="hljs-comment">//ok now let's spin up a bitcoind and a bitcoin-s wallet with funds in it</span>
<span class="hljs-keyword">val</span> walletWithBitcoindF = <span class="hljs-keyword">for</span> {
bitcoind &lt;- <span class="hljs-type">BitcoinSFixture</span>.createBitcoindWithFunds()
walletWithBitcoind &lt;- <span class="hljs-type">BitcoinSWalletTest</span>.createWalletWithBitcoindCallbacks(bitcoind, bip39PasswordOpt)
} <span class="hljs-keyword">yield</span> walletWithBitcoind
<span class="hljs-keyword">val</span> walletF = walletWithBitcoindF.map(_.wallet)
<span class="hljs-keyword">val</span> bitcoindF = walletWithBitcoindF.map(_.bitcoind)
<span class="hljs-comment">//let's see what our initial wallet balance is</span>
<span class="hljs-keyword">val</span> initBalanceF = <span class="hljs-keyword">for</span> {
w &lt;- walletF
balance &lt;- w.getBalance()
} <span class="hljs-keyword">yield</span> {
println(<span class="hljs-string">s"Initial wallet balance=<span class="hljs-subst">${balance}</span>"</span>)
balance
}
<span class="hljs-comment">//ok great! We have money in the wallet to start,</span>
<span class="hljs-comment">//now let's delete our internal tables that hold our utxos</span>
<span class="hljs-comment">//and addresses so that we end up with a 0 balance</span>
<span class="hljs-keyword">val</span> clearedWalletF = <span class="hljs-keyword">for</span> {
w &lt;- walletF
_ &lt;- initBalanceF
clearedWallet &lt;- w.clearAllUtxosAndAddresses()
zeroBalance &lt;- clearedWallet.getBalance()
} <span class="hljs-keyword">yield</span> {
println(<span class="hljs-string">s"Balance after clearing utxos: <span class="hljs-subst">${zeroBalance}</span>"</span>)
clearedWallet
}
<span class="hljs-comment">//we need to pick how many addresses we want to generate off of our keychain</span>
<span class="hljs-comment">//when doing a rescan, this means we are generating 100 addrsses</span>
<span class="hljs-comment">//and then looking for matches. If we find a match, we generate _another_</span>
<span class="hljs-comment">//100 fresh addresses and search those. We keep doing this until we find</span>
<span class="hljs-comment">//100 addresses that do not contain a match.</span>
<span class="hljs-keyword">val</span> addrBatchSize = <span class="hljs-number">100</span>
<span class="hljs-comment">//ok now that we have a cleared wallet, we need to rescan and find our fudns again!</span>
<span class="hljs-keyword">val</span> rescannedBalanceF = <span class="hljs-keyword">for</span> {
w &lt;- clearedWalletF
_ &lt;- w.fullRescanNeutrinoWallet(addrBatchSize)
balanceAfterRescan &lt;- w.getBalance()
} <span class="hljs-keyword">yield</span> {
println(<span class="hljs-string">s"Wallet balance after rescan: <span class="hljs-subst">${balanceAfterRescan}</span>"</span>)
()
}
<span class="hljs-comment">//cleanup</span>
<span class="hljs-keyword">val</span> cleanupF = <span class="hljs-keyword">for</span> {
_ &lt;- rescannedBalanceF
walletWithBitcoind &lt;- walletWithBitcoindF
_ &lt;- <span class="hljs-type">BitcoinSWalletTest</span>.destroyWalletWithBitcoind(walletWithBitcoind)
} <span class="hljs-keyword">yield</span> ()
<span class="hljs-type">Await</span>.result(cleanupF, <span class="hljs-number">60.</span>seconds)
</code></pre>
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