SigningOnlyKey
class SigningOnlyKey(val identifier: SigningKey.Identifier, val privateKey: Key) : SigningKey, JwsSigner(source)
A signing-only key that holds only the private key material, implementing JwsSigner.
Used when a token must be signed but signature verification is not performed by the same key holder (e.g. asymmetric algorithms where only the private key is available). Accessing publicKey on this type throws.