pub fn validate_identity_nonce_update(
existing_nonce: IdentityNonce,
new_revision_nonce: IdentityNonce,
identity_id: Identifier,
) -> SimpleConsensusValidationResultpub fn validate_identity_nonce_update(
existing_nonce: IdentityNonce,
new_revision_nonce: IdentityNonce,
identity_id: Identifier,
) -> SimpleConsensusValidationResult