006 · Negotiated immediate-close specification

MultisigPool v4 performs immediate close by constructing an unsigned three-output state with the final sequence and locktime; the Arbiter output remains present with amount 0. The buyer returns the unsigned transaction and a detached buyer signature. After validation, the seller produces a detached seller signature and uses MergeArbitratedPoolBuyerSellerSignatures to return the complete final transaction. Local accepted state MUST NOT advance before the node confirms the transaction.

There is no standalone wire 006 container: both roles address the pool exclusively by its RefundTemplateTxID correlation ID in public inputs and in whatever application-local records the caller keeps (the SDK holds none). The node submission interface keeps using raw transactions and real on-chain txids; the correlation ID never impersonates an on-chain txid. If a separately deliverable 006 message is ever added, its first business field MUST be refund_template_txid.