feat(wasm-utxo): implement signing workflow #68
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- Add FirstRound HashMap storage to WASM BitGoPsbt struct - Add generate_musig2_nonces WASM method with security checks - Add generateMusig2Nonces() TypeScript method - Add to_xpriv() method to WasmBIP32 for internal use - Create walletKeys.util.ts test helper - Create musig2Nonces.ts test file with comprehensive test cases - Security: Custom session IDs only allowed on testnets Issue: BTC-2786
Add sign methods to BitGoPsbt to support signing individual inputs by index: - Implement `sign` in JS that dispatches based on key type - Add Rust `sign_with_xpriv` method for wallet inputs (BIP32) - Add Rust `sign_with_privkey` method for raw private keys (ECPair) - Handle MuSig2 inputs with existing first round state - Support replay protection inputs with proper P2SH sighashing - Add comprehensive tests and documentation Issue: BTC-2786 Co-authored-by: llm-git <llm-git@ttll.de>
Implements new combineMusig2Nonces method to merge MuSig2 nonces from different PSBTs. This enables proper nonce exchange between cosigners during the MuSig2 signing workflow. The method copies nonces and partial signatures between PSBTs, validates network compatibility, and handles input count matching. Includes comprehensive tests and updated documentation with examples showing the complete MuSig2 signing workflow. Issue: BTC-2786 Co-authored-by: llm-git <llm-git@ttll.de>
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Add clippy::boxed_local allow annotations for methods that use Box<[T]> parameters, which are required by wasm-bindgen for passing JavaScript arrays. Issue: BTC-2786 Co-authored-by: llm-git <llm-git@ttll.de>
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This PR adds complete signing support to the WASM-UTXO library with
three key components:
MuSig2 Nonce Generation
MuSig2 Nonce Combination
Single Input Signing
The implementation includes comprehensive tests, documentation, and examples
showing the complete MuSig2 signing workflow.
Issue: BTC-2786