feat(certificate): tamper detection with checksums and chain of custody - #521
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LaGodxy merged 4 commits intoJun 9, 2026
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…ustody - Add CustodyEntry and TamperRecord types; CertDataKey::TamperRecord storage key - Add TamperDetected=110 and NotSealed=111 error variants - Add set/get_tamper_record storage helpers - Add compute_checksum (SHA-256 over cert_id+course_id+title+issued_at) - Add seal_certificate, verify_integrity, get_tamper_record contract functions - Tamper alert emitted via emit_certificate_verified(is_valid=false) - Add 5 tests covering seal, verify, custody log, and error cases
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Closes #404
Description
Add tamper detection to prevent certificate modification.
Changes
types.rs:CustodyEntry,TamperRecordstructs;CertDataKey::TamperRecordstorage keyerrors.rs:TamperDetected = 110,NotSealed = 111storage.rs:set_tamper_record/get_tamper_recordhelperslib.rs:compute_checksum(SHA-256),seal_certificate,verify_integrity,get_tamper_recordtest.rs: 5 testsHow It Works
seal_certificateverify_integrityCertificateVerified(is_valid=false)alert on mismatchget_tamper_recordAcceptance Criteria
TamperDetectederroremit_certificate_verified(is_valid=false)fires on tamper