Submits a request to sign an Ethereum message. Uses private keys securely stored within the custody system. The signing process is asynchronous, as it requires approval from the wallet owner(s) via our Proof of Action (PoA) mechanism.
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
Signing request accepted.
Unique ID of the signing request.
"a1b2c3d4-e5f6-7890-1234-567890abcdef"