approval_nonce_reused· reason_code· applies to event_envelope, auth_decisionAn approval signature whose (approval_context, approver_did, nonce) triple was already consumed by a successfully accepted target was presented for a different target. The nonce namespace is (approval_context, approver_did) and the nonce is consumed only when the target is accepted, in that same transaction: an exact replay of the already accepted target returns the original outcome, and a failed verification or an unmet quorum MUST NOT consume it early, so normal retries that collect the remaining votes still work. See zh/authz/constraint-schema.md section 9.2.