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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/chain/chain.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Blockchain Verification</h1></header><article><div><span><p>Bitcoin-S comes bundled with a rudimentary blockchain verification
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module. This module is currently only released as a library, and not as a binary.
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This is because it (nor the documentation) is not deemed production
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ready. Use at your own risk, and without too much money depending on it.</p>
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<h2><a class="anchor" aria-hidden="true" id="syncing-and-verifying-block-headers"></a><a href="#syncing-and-verifying-block-headers" 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 and verifying block headers</h2>
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<p>Using the <code>chain</code> module of Bitcoin-S it's possible to
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sync and verify block headers from the Bitcoin blockchain. In this document
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we demonstrate how to do this, while persisting it to disk. We should be
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able to read this chain on subsequent runs, assuming we are connected
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to the same <code>bitcoind</code> instance.</p>
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<pre><code class="hljs css language-scala">implicit val ec = ExecutionContext.global
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implicit val system = ActorSystem("System")
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// We are assuming that a `bitcoind` regtest node is running the background.
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// You can see our `bitcoind` guides to see how to connect
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// to a local or remote `bitcoind` node.
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val bitcoindInstance = BitcoindInstanceLocal.fromDatadir()
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val rpcCli = BitcoindRpcClient(bitcoindInstance)
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// Next, we need to create a way to monitor the chain:
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val getBestBlockHash = SyncUtil.getBestBlockHashFunc(rpcCli)
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val getBlockHeader = SyncUtil.getBlockHeaderFunc(rpcCli)
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// set a data directory
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val datadir = Files.createTempDirectory("bitcoin-s-test")
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// set the current network to regtest
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import com.typesafe.config.ConfigFactory
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val config = ConfigFactory.parseString {
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"""
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| bitcoin-s {
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| network = regtest
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| }
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|""".stripMargin
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}
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implicit val chainConfig = ChainAppConfig(datadir, Vector(config))
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// Initialize the needed database tables if they don't exist:
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val chainProjectInitF = chainConfig.start()
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val blockHeaderDAO = BlockHeaderDAO()
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val compactFilterHeaderDAO = CompactFilterHeaderDAO()
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val compactFilterDAO = CompactFilterDAO()
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//initialize the chain handler from the database
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val chainHandler = ChainHandler.fromDatabase(blockHeaderDAO, compactFilterHeaderDAO, compactFilterDAO)
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// Now, do the actual syncing:
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val syncedChainApiF = for {
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_ <- chainProjectInitF
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synced <- ChainSync.sync(chainHandler, getBlockHeader, getBestBlockHash)
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} yield synced
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val syncResultF = syncedChainApiF.flatMap { chainApi =>
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chainApi.getBlockCount().map(count => println(s"chain api blockcount=${count}"))
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rpcCli.getBlockCount.map(count => println(s"bitcoind blockcount=${count}"))
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}
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syncResultF.onComplete { case result =>
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println(s"Sync result=${result}")
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}
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</code></pre>
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</span></div></article></div><div class="docLastUpdate"><em>Last updated on 3/10/2020 by Chris Stewart</em></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/applications/server-systemd"><span class="arrow-prev">← </span><span>Systemd installation</span></a><a class="docs-next button" href="/docs/chain/filter-sync"><span>Syncing Blockfilters</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#syncing-and-verifying-block-headers">Syncing and verifying block headers</a></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 © 2022 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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