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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/core/hd-keys.md" target = "_blank" rel = "noreferrer noopener" > Edit< / a > < h1 id = "__docusaurus" class = "postHeaderTitle" > HD Key Generation< / h1 > < / header > < article > < div > < span > < p > In modern Bitcoin wallets, users only need to write down
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a sequence of words, and that sequence is a complete backup
of their wallet. This is thanks to what's called Hierarchical
Deterministic key generation. In short, every wallet using HD
key generation has a root seed for each wallet, and this
seed can be used to generate an arbitrary amount of later
private and public keys. This is done in a standardized manner,
so different wallets can operate with the same standard.< / p >
< blockquote >
< p > If you want to jump into the details of how this work,
you should check out
< a href = "https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki" > BIP 32< / a > .< / p >
< / blockquote >
< p > Bitcoin-S supports generating keys in this fashion. Here's a
full example of how to obtain a wallet seed, and then
use that to generate further private and public keys:< / p >
< pre > < code class = "hljs css language-scala" > < span class = "hljs-keyword" > import< / span > scodec.bits._
< span class = "hljs-keyword" > import< / span > org.bitcoins.core.crypto._
< span class = "hljs-keyword" > import< / span > org.bitcoins.core.hd._
< span class = "hljs-comment" > // the length of the entropy bit vector determine< / span >
< span class = "hljs-comment" > // how long our phrase ends up being< / span >
< span class = "hljs-comment" > // 256 bits of entropy results in 24 words< / span >
< span class = "hljs-keyword" > val< / span > entropy: < span class = "hljs-type" > BitVector< / span > = < span class = "hljs-type" > MnemonicCode< / span > .getEntropy256Bits
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< span class = "hljs-comment" > // entropy: BitVector = BitVector(256 bits, 0x943aeafb2080500250d5c192bc6326d8e5da89dc5ceaa03433735e58369bc8dc)< / span >
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< span class = "hljs-keyword" > val< / span > mnemonicCode = < span class = "hljs-type" > MnemonicCode< / span > .fromEntropy(entropy)
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< span class = "hljs-comment" > // mnemonicCode: MnemonicCode = Masked(MnemonicCodeImpl)< / span >
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mnemonicCode.words < span class = "hljs-comment" > // the phrase the user should write down< / span >
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< span class = "hljs-comment" > // res0: Vector[String] = Vector(neither, struggle, salute, donate, agree, abuse, drive, return, naive, toast, situate, range, frozen, eager, imitate, outer, parent, pave, system, royal, lock, evil, casino, lizard)< / span >
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< span class = "hljs-comment" > // the password argument is an optional, extra security< / span >
< span class = "hljs-comment" > // measure. all MnemonicCode instances will give you a< / span >
< span class = "hljs-comment" > // valid BIP39 seed, but different passwords will give< / span >
< span class = "hljs-comment" > // you different seeds. So you could have as many wallets< / span >
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< span class = "hljs-comment" > // from the same seed as you'd like, by simply giving them< / span >
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< span class = "hljs-comment" > // different passwords.< / span >
< span class = "hljs-keyword" > val< / span > bip39Seed = < span class = "hljs-type" > BIP39Seed< / span > .fromMnemonic(mnemonicCode,
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password = < span class = "hljs-string" > "secret password"< / span > )
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< span class = "hljs-comment" > // bip39Seed: BIP39Seed = Masked(BIP39SeedImpl)< / span >
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< span class = "hljs-keyword" > val< / span > xpriv = < span class = "hljs-type" > ExtPrivateKey< / span > .fromBIP39Seed(< span class = "hljs-type" > ExtKeyVersion< / span > .< span class = "hljs-type" > SegWitMainNetPriv< / span > ,
bip39Seed)
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< span class = "hljs-comment" > // xpriv: ExtPrivateKey = Masked(ExtPrivateKeyImpl)< / span >
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< span class = "hljs-keyword" > val< / span > xpub = xpriv.extPublicKey
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< span class = "hljs-comment" > // xpub: ExtPublicKey = zpub6jftahH18ngZwFJban8MyVcwHqk3E1EJqYZKcJuVt92f96hEG6zxVAKyCChVWZ5a7jvSbTJJyn6ZZdhqAm9eB5JmAJN7fWviizdtihwoGXE< / span >
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< span class = "hljs-comment" > // you can now use the generated xpriv to derive further< / span >
< span class = "hljs-comment" > // private or public keys< / span >
< span class = "hljs-comment" > // this can be done with BIP89 paths (called SegWitHDPath in bitcoin-s)< / span >
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< span class = "hljs-keyword" > val< / span > segwitPath = < span class = "hljs-type" > SegWitHDPath< / span > .fromString(< span class = "hljs-string" > "m/84'/0'/0'/0/0"< / span > )
< span class = "hljs-comment" > // segwitPath: SegWitHDPath = m/84'/0'/0'/0/0< / span >
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< span class = "hljs-comment" > // alternatively:< / span >
< span class = "hljs-keyword" > val< / span > otherSegwitPath =
< span class = "hljs-type" > SegWitHDPath< / span > (< span class = "hljs-type" > HDCoinType< / span > .< span class = "hljs-type" > Bitcoin< / span > ,
accountIndex = < span class = "hljs-number" > 0< / span > ,
< span class = "hljs-type" > HDChainType< / span > .< span class = "hljs-type" > External< / span > ,
addressIndex = < span class = "hljs-number" > 0< / span > )
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< span class = "hljs-comment" > // otherSegwitPath: SegWitHDPath = m/84'/0'/0'/0/0< / span >
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segwitPath == otherSegwitPath
< span class = "hljs-comment" > // res1: Boolean = true< / span >
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< span class = "hljs-comment" > // there's also paths available for legacy< / span >
< span class = "hljs-comment" > // addresses (LegacyHDPath) as well as nested< / span >
< span class = "hljs-comment" > // segwit paths (NestedSegWitPath)< / span >
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< / code > < / pre >
< h2 > < a class = "anchor" aria-hidden = "true" id = "generating-new-addresses-without-having-access-to-the-private-key" > < / a > < a href = "#generating-new-addresses-without-having-access-to-the-private-key" 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 > Generating new addresses without having access to the private key< / h2 >
< p > One the coolest features of HD wallets is that it's possible
to generate addresses offline, without having access to the
private keys. This feature is commonly called watch-only
wallets, where a wallet can import information about all
your past and future transactions, without being able to
spend or steal any of your money.< / p >
< p > Let's see an example of this:< / p >
< pre > < code class = "hljs css language-scala" > < span class = "hljs-keyword" > import< / span > scala.util.< span class = "hljs-type" > Success< / span >
< span class = "hljs-keyword" > import< / span > org.bitcoins.core.protocol.script._
< span class = "hljs-keyword" > import< / span > org.bitcoins.core.protocol.< span class = "hljs-type" > Bech32Address< / span >
< span class = "hljs-keyword" > import< / span > org.bitcoins.core.config.< span class = "hljs-type" > TestNet3< / span >
< span class = "hljs-comment" > // first account -------┐< / span >
< span class = "hljs-comment" > // bitcoin ----------┐ |< / span >
< span class = "hljs-comment" > // segwit --------┐ | |< / span >
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< span class = "hljs-keyword" > val< / span > accountPath = < span class = "hljs-type" > BIP32Path< / span > .fromString(< span class = "hljs-string" > "m/84'/0'/0'"< / span > )
< span class = "hljs-comment" > // accountPath: BIP32Path = m/84'/0'/0'< / span >
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< span class = "hljs-keyword" > val< / span > accountXpub = {
< span class = "hljs-comment" > // this key is sensitive, keep away from prying eyes!< / span >
< span class = "hljs-keyword" > val< / span > accountXpriv = xpriv.deriveChildPrivKey(accountPath)
< span class = "hljs-comment" > // this key is not sufficient to spend from, but we< / span >
< span class = "hljs-comment" > // can generate addresses with it!< / span >
accountXpriv.extPublicKey
}
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< span class = "hljs-comment" > // accountXpub: ExtPublicKey = zpub6rGUGaCpfb9SfVBkKDX8xyTtmmrUmdmNy6biz5C7ZPjpL4MBU8Trbnm4dE5CUANpRxWJJmwemPWRreWgHRKbnuvCqRAdgo7FeDdhbAjT7KW< / span >
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< span class = "hljs-comment" > // address no. 0 ---------------┐< / span >
< span class = "hljs-comment" > // external address ----------┐ |< / span >
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< span class = "hljs-keyword" > val< / span > firstAddressPath = < span class = "hljs-type" > SegWitHDPath< / span > .fromString(< span class = "hljs-string" > "m/84'/0'/0'/0/0"< / span > )
< span class = "hljs-comment" > // firstAddressPath: SegWitHDPath = m/84'/0'/0'/0/0< / span >
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< span class = "hljs-keyword" > val< / span > firstAccountAddress = {
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< span class = "hljs-comment" > // this is a bit quirky, but we're not interesting in< / span >
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< span class = "hljs-comment" > // deriving the complete path from our account xpub< / span >
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< span class = "hljs-comment" > // instead, we're only interested in the part after< / span >
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< span class = "hljs-comment" > // the account level (3rd level). the .diff() method< / span >
< span class = "hljs-comment" > // achieves that< / span >
< span class = "hljs-keyword" > val< / span > < span class = "hljs-type" > Some< / span > (pathDiff) = accountPath.diff(firstAddressPath)
< span class = "hljs-comment" > // deriving public keys from hardened extended keys< / span >
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< span class = "hljs-comment" > // is not possible, that's why .deriveChildPubKey()< / span >
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< span class = "hljs-comment" > // returns a Try[ExtPublicKey]. A hardened key is marked< / span >
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< span class = "hljs-comment" > // by a ' after the number in the notation we use above.< / span >
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< span class = "hljs-keyword" > val< / span > < span class = "hljs-type" > Success< / span > (extPubKey) = accountXpub.deriveChildPubKey(pathDiff)
< span class = "hljs-keyword" > val< / span > pubkey = extPubKey.key
< span class = "hljs-keyword" > val< / span > scriptPubKey = < span class = "hljs-type" > P2WPKHWitnessSPKV0< / span > (pubkey)
< span class = "hljs-type" > Bech32Address< / span > (scriptPubKey, < span class = "hljs-type" > TestNet3< / span > )
}
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< span class = "hljs-comment" > // firstAccountAddress: Bech32Address = tb1qg4tfp4z8k0qrv0nd6wvkjsnv9mxar3dq975r0q< / span >
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< span class = "hljs-comment" > // tada! We just generated an address you can send money to,< / span >
< span class = "hljs-comment" > // without having access to the private key!< / span >
firstAccountAddress.value
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< span class = "hljs-comment" > // res2: String = tb1qg4tfp4z8k0qrv0nd6wvkjsnv9mxar3dq975r0q< / span >
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< span class = "hljs-comment" > // you can now continue deriving addresses from the same public< / span >
< span class = "hljs-comment" > // key, by imitating what we did above. To get the next< / span >
< span class = "hljs-comment" > // HD path to generate an address at:< / span >
< span class = "hljs-keyword" > val< / span > nextAddressPath: < span class = "hljs-type" > SegWitHDPath< / span > = firstAddressPath.next
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< span class = "hljs-comment" > // nextAddressPath: SegWitHDPath = m/84'/0'/0'/0/1< / span >
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< / code > < / pre >
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< h3 > < a class = "anchor" aria-hidden = "true" id = "signing-things-with-hd-keys" > < / a > < a href = "#signing-things-with-hd-keys" 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 > Signing things with HD keys< / h3 >
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< p > Please see < a href = "/docs/next/crypto/sign" > sign.md< / a > for information on how to sign things with HD keys.< / p >
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