Wallet Signing Capability Map

The current stack can build simple legacy, SegWit v0, and Taproot key-path signing flows.

• Generate or import BIP39 mnemonic entropy with `(sigil bitcoin keys)`.
• Derive BIP32 private and public keys, including BIP44/49/84/86 account and address keys.
• Convert public keys into P2PKH, P2WPKH, or P2TR addresses.
• Construct unsigned transactions with `(sigil bitcoin tx)`.
• Sign legacy P2PKH inputs with `transaction-sign-p2pkh-input`.
• Sign SegWit v0 P2WPKH inputs with `transaction-sign-p2wpkh-input`.
• Sign BIP86-style Taproot key-path inputs with `transaction-sign-p2tr-keypath-input`.
• Create a PSBT from the unsigned transaction.
• Attach non-witness UTXO data for P2PKH inputs.
• Attach witness UTXO data for SegWit v0 and Taproot key-path inputs.
• Preserve global, input, and output unknown/proprietary PSBT keys during parse and serialize.
• Preserve input and output BIP32/Taproot derivation records for wallet coordination.
• Derive descriptor and wallet-policy PSBT plans for input/output annotation.
• Sign and finalize P2PKH, P2WPKH, single-key P2WSH, and BIP86-style Taproot key-path PSBT inputs.
• Compute BIP341 key-path sighashes for Taproot spends.
• Extract finalized PSBTs into signed transactions.

The complete PSBT signing/finalization paths are P2PKH, P2WPKH, single-key P2WSH with `SIGHASH_ALL`, and BIP86-style Taproot key-path spends with `SIGHASH_DEFAULT` or `SIGHASH_ALL`.

Still pending:

• Taproot script-tree descriptor signing.