{"id":1190547,"record_url":"https://metalstack.app/1190547","status":"listed","algorithm":"SHA-256","record_hash":"f71845a9005e174c180574cd8ba90e1b5c030d287dbe33bef7c1eb677637ac5f","record_hash_recomputed":"f71845a9005e174c180574cd8ba90e1b5c030d287dbe33bef7c1eb677637ac5f","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\":1190547,\"title\":\"2 oz Hand-Poured Bar\",\"metal\":\"silver\",\"fineness\":\".999\",\"weight_g\":62.33,\"dims_mm\":\"38.2 x 24.0 x 9.8\",\"year\":null,\"checks\":[{\"type\":\"composition\",\"instrument\":\"XRF-01\",\"result\":\"pass\",\"reading\":\"Ag 99.88%\",\"tested_at\":\"2026-06-11\"},{\"type\":\"conductivity\",\"instrument\":\"PMV-01\",\"result\":\"pass\",\"reading\":\"Ag .999 ✓\",\"tested_at\":\"2026-06-11\"},{\"type\":\"dimensions\",\"instrument\":\"CAL-01\",\"result\":\"pass\",\"reading\":\"38.2 x 24.0 x 9.8 mm - matches published spec\",\"tested_at\":\"2026-06-11\"},{\"type\":\"inspection\",\"instrument\":null,\"result\":\"pass\",\"reading\":\"Stamps and construction consistent; no plating wear or seams of concern under magnification/UV\",\"tested_at\":\"2026-06-11\"},{\"type\":\"magnet\",\"instrument\":null,\"result\":\"pass\",\"reading\":\"Non-magnetic; eddy-slide consistent with high-conductivity metal\",\"tested_at\":\"2026-06-11\"},{\"type\":\"weight\",\"instrument\":\"SCALE-01\",\"result\":\"pass\",\"reading\":\"62.33 g\",\"tested_at\":\"2026-06-11\"}],\"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":"2026-06-11 09:42:10","event_type":"intake","detail":"Item received into intake","prev_chain_hash":null,"chain_hash":"c3e4d963eca967de8dae5f677fa0c53ed7d9fe6297368959ec53bea2df103f53"},{"created_at":"2026-06-11 09:48:31","event_type":"check_recorded","detail":"Weighed: 62.33 g - SCALE-01, operator PS","prev_chain_hash":"c3e4d963eca967de8dae5f677fa0c53ed7d9fe6297368959ec53bea2df103f53","chain_hash":"cdc7ea063bbbdb2b085843bf5f91f231255e9149a5d258d15c8381f59ae3d8b3"},{"created_at":"2026-06-11 09:51:07","event_type":"check_recorded","detail":"Magnet & eddy-slide: non-magnetic, high-conductivity response","prev_chain_hash":"cdc7ea063bbbdb2b085843bf5f91f231255e9149a5d258d15c8381f59ae3d8b3","chain_hash":"9331f301d8a032f1550dc99a15e23dddc270d9ea8e5ba369f932e6b33eecbf8f"},{"created_at":"2026-06-11 09:54:20","event_type":"check_recorded","detail":"Composition: Ag 99.88% - XRF-01, operator PS","prev_chain_hash":"9331f301d8a032f1550dc99a15e23dddc270d9ea8e5ba369f932e6b33eecbf8f","chain_hash":"034ee9966b07d34d6bc17a61106787835e8b8dfdf02b6757c08a3e3175e0d66f"},{"created_at":"2026-06-11 09:56:40","event_type":"check_recorded","detail":"Conductivity (secondary): Ag .999 ✓ - PMV-01 (Sigma)","prev_chain_hash":"034ee9966b07d34d6bc17a61106787835e8b8dfdf02b6757c08a3e3175e0d66f","chain_hash":"60027ca24a4810237b11daaf76259459382d5bee4780faed447fc24ab609e221"},{"created_at":"2026-06-11 10:00:05","event_type":"check_recorded","detail":"Inspection: marks & construction consistent; no plating wear","prev_chain_hash":"60027ca24a4810237b11daaf76259459382d5bee4780faed447fc24ab609e221","chain_hash":"f57640b646b7f0c86dce30732834b7f3536eb71003521bcd619ed3ff87464114"},{"created_at":"2026-06-11 10:02:40","event_type":"check_recorded","detail":"Supplementary: dimensions 38.2 x 24.0 x 9.8 mm match spec","prev_chain_hash":"f57640b646b7f0c86dce30732834b7f3536eb71003521bcd619ed3ff87464114","chain_hash":"dba13f580e7a765dc191e34f7370583839c8a78fce766ee3b5c9377f110c3fed"},{"created_at":"2026-06-11 10:08:15","event_type":"seal_applied","detail":"Tamper-evident hologram seal applied","prev_chain_hash":"dba13f580e7a765dc191e34f7370583839c8a78fce766ee3b5c9377f110c3fed","chain_hash":"598147b6a36a28561220dc0303feddf21ca992c54b2c384e53df8c7abd74dc37"},{"created_at":"2026-06-11 10:11:23","event_type":"status_change","detail":"Record published - status: verified","prev_chain_hash":"598147b6a36a28561220dc0303feddf21ca992c54b2c384e53df8c7abd74dc37","chain_hash":"1425f148b42b7fcd4b283fefe6939b99d75c320247482e3f401e476e5a8a7c81"},{"created_at":"2026-06-11 10:14:02","event_type":"card_issued","detail":"Verification card MS-1190547 issued","prev_chain_hash":"1425f148b42b7fcd4b283fefe6939b99d75c320247482e3f401e476e5a8a7c81","chain_hash":"322a290ba3b35a7f6c0a5b45c179b5bc984a394a89004c3931a45b5dd775820b"},{"created_at":"2026-06-11 12:30:00","event_type":"status_change","detail":"Listed for sale","prev_chain_hash":"322a290ba3b35a7f6c0a5b45c179b5bc984a394a89004c3931a45b5dd775820b","chain_hash":"f9f454146256ab4d924aafd1a4f7fbb9ddeb5a1475463b339f0218f35cb10d15"}]}