Aegis's Bitcoin adapter can now sign transactions from every BIP44/49/84/86
address it derives. Receive already worked on all four in the previous rev
— this closes the send side.
- BIP44 (legacy P2PKH, 1…): signAndBroadcast now fetches each spent UTXO's
parent transaction via blockchain.transaction.get(txid, false) and hands
the raw hex to PSBT as nonWitnessUtxo. Prev-tx calls fan out in parallel
with Promise.all so a multi-input legacy send doesn't serialize the wait.
- BIP86 (Taproot key-path, bc1p…): signInput now uses a tap-tweaked
signer — the internal ECPair, tweaked with sha256("TapTweak" ||
internalPubkey) via ECPair.tweak(). bitcoinjs-lib matches the tweaked
pubkey against the on-chain output key and signs with schnorr. The
input carries tapInternalKey so the PSBT layer knows it's a key-path
spend (no leaf script).
- The plan-time "not yet in this rev" refusal is gone. paymentFor()
returns send: "p2pkh" / "p2tr" for the two families; every path in
the picker signs today.
- Fee vsize model already covered p2pkh (148 vB per input) and p2tr
(58 vB per input) — unchanged.
- Verified in scratchpad/verify-btc-send.mjs: all four families
produce a fully-finalized wire tx (bitcoinjs-lib refuses to
finalize an invalid signature, so a valid extractTransaction()
result is proof the signing path is correct). Vsize per family:
BIP44 222 vB, BIP49 165 vB, BIP84 141 vB, BIP86 142 vB — all
match the input-count/vsize model in this file's fee estimator.
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