sign
Produces a 64-byte Ed25519 signature over authDigest.
Called by the multi-signer pipeline when canSignFor returned true for the same key pair. The pipeline locally verifies the returned signature before incorporating it into the authorization payload.
Return
The 64-byte raw Ed25519 signature over authDigest.
Parameters
auth
The 32-byte digest to sign, computed as SHA-256(signaturePayload || contextRuleIds.toXDR()).
public
The 32-byte Ed25519 public key that identifies which key to sign with.