The self-custodial agent now drives BOTH chains of a T6 channel, closing the gap
Phase 4b left open (board-only). Open funds a real BTC 2-of-2 on signet coordinated
with board state 0 (1:1 capacity); Close settles the 2-of-2 to the board's latest
split via a cooperative-close PSBT co-signed over the keyless relay — the co-signer
verifies the payout against the board before signing (verifyClose: outputs == board
split AND input spends our 2-of-2; no blind-signing). BTC pubkeys ride the hello
handshake; each agent still holds only its own keys, relay holds none.
Validated on real coins (two agent processes):
BTC fund c0832299 (10000 sat 2-of-2) [signet]
board #0 04ccc060 (6000/4000) [chipnet]
A→B 2000 fd3367bd (4000/6000)
B→A 1000 d968a524 (5000/5000)
coop close a380d0e4 → Alice 4750 / Bob 4750 [signet, 2 outputs spend the 2-of-2]
Adds t6-btc.inspectClose + agent Close flow + UI Close button/BTC panel. Finding:
bitcoinjs v7 returns witnessScript as Uint8Array — Buffer.from() before .toString('hex').
Spec §3.5/§4/§5/§6/§7 + snapshot 0189.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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