pub fn signed_message(nonce: &str, responder_did: &str) -> Vec<u8> ⓘExpand description
Canonical, domain-separated message that the responder signs.
Binding both the nonce and the responder DID means a valid signature proves “the holder of this key asserts this DID in response to this nonce” — a signature cannot be lifted to a different nonce or re-attributed to a different DID.