feat(bitcoin): add headless + browser wallet SDK#8
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Implement IBitcoinWallet across two surfaces: - BitcoinHeadlessWallet: in-process signer (BIP-39 → BIP-32 → BIP-84/86). - getNetwork, getAddresses, getAccounts, getBalance - signMessage (ECDSA with magic-prefix + 65-byte recoverable sig) - signTransfer (RBF opt-in, dust-aware change, P2WPKH vbyte estimates) - signPsbt (P2WPKH ECDSA + P2TR BIP-86 key-path Schnorr w/ tweaked key) - BitcoinBrowserWallet: registry + Xverse adapter speaking Sats Connect with dual-envelope support (sats-connect-core normalised + raw JSON-RPC 2.0). Test coverage: 93 bitcoin tests across 5 suites — BIP-84/86 vectors, recoverable-sig verification, dust-handling, Taproot tweaked-key signing, Xverse wire-format compatibility, and address-type validation. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Mirrors existing signMessage (BIP-137, 65-byte compact recoverable ECDSA, base64). Cross-type acceptance: recovered pubkey matched against P2PKH / P2SH-P2WPKH / P2WPKH / P2TR (BIP-86). Adds IBitcoinWallet.verifyMessage, instance methods on Headless + Browser wallets, and local trustless verify in the Xverse adapter (throws clear "not yet supported" for non-65-byte BIP-322 sigs). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
IBitcoinWalletmethods (getNetwork,getAddresses,getAccounts,getBalance,signMessage,signTransfer,signPsbt).provider.request(method, params). Handles both the sats-connect-core-normalised{status, result}envelope and the raw JSON-RPC 2.0{jsonrpc, result}envelope so it works against any Xverse build.Crypto correctness
signMessageproduces a 65-byte ECDSA recoverable signature with the"Bitcoin Signed Message:\n"magic prefix and computed recovery id — verifiable by Electrum / Sparrow /bitcoinjs-message.signTransferopts into BIP-125 RBF (sequence0xfffffffd), uses realistic P2WPKH vbyte math (overhead 11, input 68, output 31), and absorbs sub-dust change (< 546 sats) into the miner fee instead of producing a non-standard output.signPsbtfor Taproot uses BIP-86 single-key spend with the tweaked private key; signer'spublicKeyexposes the tweaked output key (matching bitcoinjs-lib'sgetTaprootHashesForSigcheck) andtapInternalKeyis set on the PSBT input so finalisers can round-trip.Dependencies (3 added)
bitcoinjs-lib ^6.1.7bip39 ^3.1.0ecpair ^2.1.0(reuses existing
bip32 ^5.0.0+tiny-secp256k1 ^2.2.4)Test plan
npx tsc --noEmit— no errors insrc/ortest/npx jest test/bitcoin/— 5 suites, 93 tests passnpx jest(full repo) — 16 suites, 171 tests passnpx tsup— ESM 187 KB + CJS 173 KB + dts 39 KB builds clean🤖 Generated with Claude Code