Each check is genuinely signed by your wallet off-chain via signMessage. The signature is a real Ed25519 signature over the hex-encoded canonical check, and the exact bytes are reused on-chain at close time.

Open a channel first.

close_channel settles the last check’s cumulative amount to the payee and refunds the remainder to the payer, verifying the payer signature on-chain. If a party disappears, dispute_channel and timeout_reclaim protect both sides.