Identifier of the key to sign with. Must match the keyIdentifier of a
previously completed key-generation job.
Raw bytes to sign, hex-encoded without a 0x prefix. No additional
hashing is performed by the engine; pass the digest (or raw message)
according to the target chain convention.
Request body for
POST /signing.The
publicKeyPackage,algorithm,threshold, andparticipantsrequired by the engine are retrieved from the key-metadata store usingkeyIdentifier; the client does not need to supply them.