{"id":9301458,"record_url":"https://metalstack.app/9301458","status":"verified","algorithm":"SHA-256","record_hash":"d9850d1e579e25b049540e546853565f014545541dedc6c8e75987d314b6c528","record_hash_recomputed":"d9850d1e579e25b049540e546853565f014545541dedc6c8e75987d314b6c528","matches":true,"record_hash_method":"record_hash = SHA-256(utf8(canonical)). The `canonical` string below is the exact, verbatim preimage — recompute it yourself and compare.","canonical":"{\"id\":9301458,\"title\":\"1/10 oz Gold Eagle\",\"metal\":\"gold\",\"fineness\":\".9167\",\"weight_g\":3.39,\"dims_mm\":\"D16.5 x 1.3\",\"year\":null,\"checks\":[{\"type\":\"composition\",\"instrument\":\"XRF-01\",\"result\":\"pass\",\"reading\":\"Au 91.68%\",\"tested_at\":\"2026-06-12\"},{\"type\":\"conductivity\",\"instrument\":\"PMV-01\",\"result\":\"pass\",\"reading\":\"Au .9167 ✓\",\"tested_at\":\"2026-06-12\"},{\"type\":\"dimensions\",\"instrument\":\"CAL-01\",\"result\":\"pass\",\"reading\":\"D16.5 x 1.3 mm - matches published spec\",\"tested_at\":\"2026-06-12\"},{\"type\":\"inspection\",\"instrument\":null,\"result\":\"pass\",\"reading\":\"Design, edge and marks consistent with a genuine example; no plating wear; no concerns under magnification/UV\",\"tested_at\":\"2026-06-12\"},{\"type\":\"magnet\",\"instrument\":null,\"result\":\"pass\",\"reading\":\"Non-magnetic; eddy-slide consistent with high-conductivity metal\",\"tested_at\":\"2026-06-12\"},{\"type\":\"ping\",\"instrument\":null,\"result\":\"pass\",\"reading\":\"Resonance within expected profile\",\"tested_at\":\"2026-06-12\"},{\"type\":\"weight\",\"instrument\":\"SCALE-01\",\"result\":\"pass\",\"reading\":\"3.39 g\",\"tested_at\":\"2026-06-12\"}],\"images\":[],\"seal\":true}","event_chain_method":"chain_hash = SHA-256(prev_chain_hash + '|' + item_id + '|' + event_type + '|' + detail + '|' + created_at). prev_chain_hash is '' for the first event; each event's prev_chain_hash must equal the previous event's chain_hash.","events":[{"created_at":"2026-06-12 09:42:10","event_type":"intake","detail":"Item received into intake","prev_chain_hash":null,"chain_hash":"87e4d3ab9a6f36ecd50c897d2a472545fe292ea3a3c2130d4ddb571c681db6ca"},{"created_at":"2026-06-12 09:48:31","event_type":"check_recorded","detail":"Weighed: 3.39 g - SCALE-01, operator PS","prev_chain_hash":"87e4d3ab9a6f36ecd50c897d2a472545fe292ea3a3c2130d4ddb571c681db6ca","chain_hash":"3c8d93829883501c90b579e1ac84ffc4e0f9c126f35abc10b593a71e7e1abe9e"},{"created_at":"2026-06-12 09:51:07","event_type":"check_recorded","detail":"Magnet & eddy-slide: non-magnetic, high-conductivity response","prev_chain_hash":"3c8d93829883501c90b579e1ac84ffc4e0f9c126f35abc10b593a71e7e1abe9e","chain_hash":"8b43a739875734c9ae979c3ae6521dff353f7f25a3857e9aa0fd3919de96034f"},{"created_at":"2026-06-12 09:54:20","event_type":"check_recorded","detail":"Composition: Au 91.68% - XRF-01, operator PS","prev_chain_hash":"8b43a739875734c9ae979c3ae6521dff353f7f25a3857e9aa0fd3919de96034f","chain_hash":"390cd5dfcfcd24ce28cd1902795892724c5dc1fdb9aeb1cad7d071f6fec517ec"},{"created_at":"2026-06-12 09:56:40","event_type":"check_recorded","detail":"Conductivity (secondary): Au .9167 ✓ - PMV-01 (Sigma)","prev_chain_hash":"390cd5dfcfcd24ce28cd1902795892724c5dc1fdb9aeb1cad7d071f6fec517ec","chain_hash":"31e9e6ad0684389daf02120a0d68ad7fa442d8aaa0a80e13fa8d690090d819c0"},{"created_at":"2026-06-12 10:00:05","event_type":"check_recorded","detail":"Inspection: marks & construction consistent; no plating wear","prev_chain_hash":"31e9e6ad0684389daf02120a0d68ad7fa442d8aaa0a80e13fa8d690090d819c0","chain_hash":"685eeb763839da857ae3b7ec7d00f237aedbf446808d7be94635f2054b9e0928"},{"created_at":"2026-06-12 10:02:40","event_type":"check_recorded","detail":"Supplementary: dimensions D16.5 x 1.3 mm match spec; ping within profile","prev_chain_hash":"685eeb763839da857ae3b7ec7d00f237aedbf446808d7be94635f2054b9e0928","chain_hash":"1059966b520b1c3ee7cfc996039217c39d2500f2a179770439c88c8c8f18d4df"},{"created_at":"2026-06-12 10:08:15","event_type":"seal_applied","detail":"Tamper-evident hologram seal applied","prev_chain_hash":"1059966b520b1c3ee7cfc996039217c39d2500f2a179770439c88c8c8f18d4df","chain_hash":"8038eec20e82df3d3f5ef63f94d6273eedb88792c0561b95b21df91ec3cb00e0"},{"created_at":"2026-06-12 10:11:23","event_type":"status_change","detail":"Record published - status: verified","prev_chain_hash":"8038eec20e82df3d3f5ef63f94d6273eedb88792c0561b95b21df91ec3cb00e0","chain_hash":"a3d288619a718cab33359e379ad3678f16cc077e40dd44abe06e48d58e0f8d53"},{"created_at":"2026-06-12 10:14:02","event_type":"card_issued","detail":"Verification card MS-9301458 issued","prev_chain_hash":"a3d288619a718cab33359e379ad3678f16cc077e40dd44abe06e48d58e0f8d53","chain_hash":"7e40d8a807c608495f7be45c4b4754d7c1979ca1a68a937b9d3ef35862531a9d"}]}