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< p > Bitcoin-s comes bundled with a rudimentary Bitcoin wallet. This wallet
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is capable of managing private keys, generating addresses, constructing
and signing transactions, among other things. It is BIP32/BIP44/BIP49/BIP84
compatible.< / p >
< p > This wallet is currently only released as a library, and not as a binary.
This is because it (nor the documentation) is not deemed production
ready. Use at your own risk, and without too much money depending on it.< / p >
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< h3 > < a class = "anchor" aria-hidden = "true" id = "how-is-the-bitcoin-s-wallet-implemented" > < / a > < a href = "#how-is-the-bitcoin-s-wallet-implemented" 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 > How is the bitcoin-s wallet implemented< / h3 >
< p > The bitcoin-s wallet is a scalable way for individuals up to large bitcoin exchanges to safely and securely store their bitcoin in a scalable way.< / p >
< p > All key interactions are delegated to the < a href = "key-manager.md" > key-manager< / a > which is a minimal dependecy library to store and use key material.< / p >
< p > By default, we store the encrypted root key in < code > $HOME/.bitcoin-s/encrypted-bitcoin-s-seed.json< / code > . This is the seed that is used for each of the wallets on each bitcoin network.< / p >
< p > The wallet itself is used to manage the utxo life cycle, create transactions, and update wallet balances to show how much money you have the on a bitcoin network.< / p >
< p > We use < a href = "https://scala-slick.org/doc/3.3.1/" > slick< / a > as middleware to support different database types. Depending on your use case, you can use something as simple as sqlite, or something much more scalable like postgres.< / p >
< h3 > < a class = "anchor" aria-hidden = "true" id = "example" > < / a > < a href = "#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 > Example< / h3 >
< p > This guide shows how to create a Bitcoin-s wallet and then
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peer it with a < code > bitcoind< / code > instance that relays
information about what is happening on the blockchain
through the P2P network.< / p >
< p > This is useful if you want more flexible signing procedures in
the JVM ecosystem and more granular control over your
UTXOs with popular database like Postgres, SQLite, etc.< / p >
< p > This code snippet you have a running < code > bitcoind< / code > instance, locally
on regtest.< / p >
< pre > < code class = "hljs css language-scala" > implicit val ec = scala.concurrent.ExecutionContext.global
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val config = ConfigFactory.parseString {
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"""
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| bitcoin-s {
| network = regtest
| }
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""".stripMargin
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}
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val datadir = Files.createTempDirectory("bitcoin-s-wallet")
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implicit val walletConfig = WalletAppConfig(datadir, config)
// we also need to store chain state for syncing purposes
implicit val chainConfig = ChainAppConfig(datadir, config)
// when this future completes, we have
// created the necessary directories and
// databases for managing both chain state
// and wallet state
val configF: Future[Unit] = for {
_ < - walletConfig.initialize()
_ < - chainConfig.initialize()
} yield ()
val bitcoindInstance = BitcoindInstance.fromDatadir()
val bitcoind = BitcoindRpcClient(bitcoindInstance)
// when this future completes, we have
// synced our chain handler to our bitcoind
// peer
val syncF: Future[ChainApi] = configF.flatMap { _ =>
val getBestBlockHashFunc = { () =>
bitcoind.getBestBlockHash
}
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val getBlockHeaderFunc = { hash: DoubleSha256DigestBE =>
bitcoind.getBlockHeader(hash).map(_.blockHeader)
}
val blockHeaderDAO = BlockHeaderDAO()
val compactFilterHeaderDAO = CompactFilterHeaderDAO()
val compactFilterDAO = CompactFilterDAO()
val chainHandler = ChainHandler(
blockHeaderDAO,
compactFilterHeaderDAO,
compactFilterDAO,
blockchains = Vector.empty,
blockFilterCheckpoints = Map.empty)
ChainSync.sync(chainHandler, getBlockHeaderFunc, getBestBlockHashFunc)
}
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//initialize our key manager, where we store our keys
//you can add a password here if you want
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//val bip39PasswordOpt = Some("my-password-here")
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val bip39PasswordOpt = None
val keyManager = BIP39KeyManager.initialize(walletConfig.kmParams, bip39PasswordOpt).getOrElse {
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throw new RuntimeException(s"Failed to initalize key manager")
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}
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// once this future completes, we have a initialized
// wallet
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val wallet = Wallet(keyManager, new NodeApi {
override def downloadBlocks(blockHashes: Vector[DoubleSha256Digest]): Future[Unit] = Future.successful(())
}, new ChainQueryApi {
override def getBlockHeight(blockHash: DoubleSha256DigestBE): Future[Option[Int]] = Future.successful(None)
override def getBestBlockHash(): Future[DoubleSha256DigestBE] = Future.successful(DoubleSha256DigestBE.empty)
override def getNumberOfConfirmations(blockHashOpt: DoubleSha256DigestBE): Future[Option[Int]] = Future.successful(None)
override def getFilterCount: Future[Int] = Future.successful(0)
override def getHeightByBlockStamp(blockStamp: BlockStamp): Future[Int] = Future.successful(0)
override def getFiltersBetweenHeights(startHeight: Int, endHeight: Int): Future[Vector[FilterResponse]] = Future.successful(Vector.empty)
})
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val walletF: Future[WalletApi] = configF.flatMap { _ =>
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Wallet.initialize(wallet,bip39PasswordOpt)
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}
// when this future completes, ww have sent a transaction
// from bitcoind to the Bitcoin-S wallet
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val transactionF: Future[(Transaction, Option[DoubleSha256DigestBE])] = for {
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wallet < - walletF
address < - wallet.getNewAddress()
txid < - bitcoind.sendToAddress(address, 3.bitcoin)
transaction < - bitcoind.getRawTransaction(txid)
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} yield (transaction.hex, transaction.blockhash)
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// when this future completes, we have processed
// the transaction from bitcoind, and we have
// queried our balance for the current balance
val balanceF: Future[CurrencyUnit] = for {
wallet < - walletF
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(tx, blockhash) < - transactionF
_ < - wallet.processTransaction(tx, blockhash)
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balance < - wallet.getBalance
} yield balance
balanceF.foreach { balance =>
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println(s"Bitcoin-S wallet balance: $balance")
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}
< / code > < / pre >
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< / span > < / div > < / article > < / div > < div class = "docLastUpdate" > < em > Last updated on 4/28/2020 by Ben Carman< / em > < / div > < div class = "docs-prevnext" > < / div > < / div > < / div > < nav class = "onPageNav" > < ul class = "toc-headings" > < li > < a href = "#bitcoin-s-wallet" > Bitcoin-s wallet< / a > < ul class = "toc-headings" > < li > < a href = "#how-is-the-bitcoin-s-wallet-implemented" > How is the bitcoin-s wallet implemented< / a > < / li > < li > < a href = "#example" > Example< / 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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