Runs the MPC signing rounds for this co-signer.
Before contributing a share, the shared payload is checked against the transaction record named by the nudge — the relay forwards whatever a party puts on the wire, so the record fetched from the Salt API is the only account of what was actually proposed and policy-checked.
PayloadMismatchError if the shared payload is not the transaction the record describes
PolicyBreachError if the record was rejected by policy
ValidationError if the record belongs to another account or is no longer open for signing
CeremonyTimeoutError if the signing ceremony times out
Returned by the
joincallback of a NudgeListener signing nudge. Call wait() to contribute this party's signature share. The co-signer's role ends when signing completes.