Bitcoin addresses from the same mnemonic

Derive the paired BTC account (what Leather/Xverse show next to your Stacks address) with no extra dependencies — BIP84 native segwit or BIP86 taproot, network-aware:

import { mnemonicToBitcoinKeys } from "@secondlayer/stacks/accounts";
 
const btc = mnemonicToBitcoinKeys(mnemonic, { type: "p2tr" });
btc.address; // bc1p…   (path m/86'/0'/0'/0/0)
 
mnemonicToBitcoinKeys(mnemonic, { type: "p2wpkh", network: "testnet" }).address; // tb1q…

Pure derivation — no Bitcoin transaction building or signing. The pubkey→address helpers (publicKeyToP2wpkhAddress, publicKeyToP2trAddress, taprootTweakPubkey) are exported from @secondlayer/stacks/bitcoin, validated against the BIP84/86/341 test vectors.

The sBTC extension uses the same machinery to derive the signers' deposit address straight from the on-chain registry — network-aware, so testnet gives tb1p… instead of a wrong-network address:

const client = createPublicClient({ chain: mainnet, transport: http() }).extend(sbtc());
await client.sbtc.getSignersAddress();   // bc1p… (derived from get-current-aggregate-pubkey)
await client.sbtc.getSignersPublicKey(); // 33-byte aggregate key