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63 lines
1.9 KiB
Markdown
63 lines
1.9 KiB
Markdown
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---
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id: addresses
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title: Generating addresses
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---
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Almost all Bitcoin applications need to generate addresses
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for their users somehow. There's a lot going on in getting
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a correct bitcoin address, but our APIs make it possible to
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to get started with all types of addresses in a matter of
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minutes.
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## Generating SegWit (bech32) addresses
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Generating native SegWit addresses in the bech32 format
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is something that all Bitcoin applications should enable,
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as it makes the transaction fees less expensive, and also
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makes the addresses more readable by humans. However, it
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has seen slower than necessary adoption. With Bitcoin-S
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you can generate bech32 addresses in four(!) lines of code
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(not counting comments and imports), so now there's no
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reason to keep using legacy transaction formats.
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```scala mdoc:to-string
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import org.bitcoins.core.{crypto, protocol, config}
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// if you want to get addresses for mainnet, just import
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// config.MainNet here instead
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import config.TestNet3
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import crypto.ECPrivateKey
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// this gets all addresses into scope
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import protocol._
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// this gets all scriptPubKeys into scope
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import protocol.script._
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// this generates a random private key
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val privkey = ECPrivateKey()
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val pubkey = privkey.publicKey
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val segwitAddress = {
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// see https://bitcoin.org/en/glossary/pubkey-script
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// for reading resources on the details of scriptPubKeys
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// pay-to-witness-pubkey-hash scriptPubKey V0
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val scriptPubKey = P2WPKHWitnessSPKV0(pubkey)
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Bech32Address(scriptPubKey, TestNet3)
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}
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```
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## Generating legacy (base58) addresses
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If you need to generate legacy addresses for backwards
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compatability reasons, that's also a walk in the park.
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Take a look:
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```scala mdoc:to-string
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// pay-to-pubkey-hash address
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import org.bitcoins.core.protocol.P2PKHAddress
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// we're reusing the same private/public key pair
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// from before. don't do this in an actual application!
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val legacyAddress = P2PKHAddress(pubkey, TestNet3)
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```
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