Returns ALL refund witnesses from a NUT-11 P2PK secret NB: Does not specify if they are expected to sign - see: getP2PKExpectedWitnessPubkeys()
The NUT-11 P2PK secret.
Array of public keys or empty array.
If secret is not P2PK.
Returns ALL refund witnesses from a NUT-11 P2PK secret NB: Does not specify if they are expected to sign - see: getP2PKExpectedWitnessPubkeys()