{"id":7726934,"record_url":"https://metalstack.app/7726934","status":"verified","algorithm":"SHA-256","record_hash":"27dc71b3229aa2df80bf92c545a273de7011775aaf56b5b68c87b2797e64de8c","record_hash_recomputed":"27dc71b3229aa2df80bf92c545a273de7011775aaf56b5b68c87b2797e64de8c","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\":7726934,\"title\":\"1889 Victoria Crown\",\"metal\":\"silver\",\"fineness\":\".925\",\"weight_g\":28.19,\"dims_mm\":\"D38.6 x 2.9\",\"year\":\"1889\",\"checks\":[{\"type\":\"composition\",\"instrument\":\"XRF-01\",\"result\":\"pass\",\"reading\":\"Ag 92.41%\",\"tested_at\":\"2026-06-12\"},{\"type\":\"conductivity\",\"instrument\":\"PMV-01\",\"result\":\"pass\",\"reading\":\"Ag .925 ✓\",\"tested_at\":\"2026-06-12\"},{\"type\":\"dimensions\",\"instrument\":\"CAL-01\",\"result\":\"pass\",\"reading\":\"D38.6 x 2.9 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\":\"28.19 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":"4f819cf3ec50786df0b341849934814248200364b3268aa0c06fb89d593aa5de"},{"created_at":"2026-06-12 09:48:31","event_type":"check_recorded","detail":"Weighed: 28.19 g - SCALE-01, operator PS","prev_chain_hash":"4f819cf3ec50786df0b341849934814248200364b3268aa0c06fb89d593aa5de","chain_hash":"e0e37a057692db93ec9db55857b80c3cba3c77bc5802f8113d71735ae9a3d940"},{"created_at":"2026-06-12 09:51:07","event_type":"check_recorded","detail":"Magnet & eddy-slide: non-magnetic, high-conductivity response","prev_chain_hash":"e0e37a057692db93ec9db55857b80c3cba3c77bc5802f8113d71735ae9a3d940","chain_hash":"30611a1e737772a77bbbfde7922e2015394fde76c2066293894a41503b1921f1"},{"created_at":"2026-06-12 09:54:20","event_type":"check_recorded","detail":"Composition: Ag 92.41% - XRF-01, operator PS","prev_chain_hash":"30611a1e737772a77bbbfde7922e2015394fde76c2066293894a41503b1921f1","chain_hash":"6156fc6e33d5fc5f1c4a53bd0d4ea12e7ab84d9461fc0a8b04859341929c0c63"},{"created_at":"2026-06-12 09:56:40","event_type":"check_recorded","detail":"Conductivity (secondary): Ag .925 ✓ - PMV-01 (Sigma)","prev_chain_hash":"6156fc6e33d5fc5f1c4a53bd0d4ea12e7ab84d9461fc0a8b04859341929c0c63","chain_hash":"94bfed23ddfc5d0729c4ffc877531487f2d9529a227e854a1f380e797c2ed734"},{"created_at":"2026-06-12 10:00:05","event_type":"check_recorded","detail":"Inspection: marks & construction consistent; no plating wear","prev_chain_hash":"94bfed23ddfc5d0729c4ffc877531487f2d9529a227e854a1f380e797c2ed734","chain_hash":"f048ccf70227fcf1bd7d54b4f5a341d75a461a896332a07e2847b6350f48722f"},{"created_at":"2026-06-12 10:02:40","event_type":"check_recorded","detail":"Supplementary: dimensions D38.6 x 2.9 mm match spec; ping within profile","prev_chain_hash":"f048ccf70227fcf1bd7d54b4f5a341d75a461a896332a07e2847b6350f48722f","chain_hash":"657fc6f6f1650b265399e9a4e20c4fbd440c6d132f8deb60552427a1206c1ad0"},{"created_at":"2026-06-12 10:08:15","event_type":"seal_applied","detail":"Tamper-evident hologram seal applied","prev_chain_hash":"657fc6f6f1650b265399e9a4e20c4fbd440c6d132f8deb60552427a1206c1ad0","chain_hash":"41745bd0bb899baab1acc99f7e40e518f7e8b7b5e42e1efcf4c5385b14766fef"},{"created_at":"2026-06-12 10:11:23","event_type":"status_change","detail":"Record published - status: verified","prev_chain_hash":"41745bd0bb899baab1acc99f7e40e518f7e8b7b5e42e1efcf4c5385b14766fef","chain_hash":"89b17a57d6ddaa3d3519d88f1065ad016bb69a3e9f46c5dcc743ee8872ca9e50"},{"created_at":"2026-06-12 10:14:02","event_type":"card_issued","detail":"Verification card MS-7726934 issued","prev_chain_hash":"89b17a57d6ddaa3d3519d88f1065ad016bb69a3e9f46c5dcc743ee8872ca9e50","chain_hash":"4f2115819ba6bc87a14312d3e69111c533ba5a4e421532f58877af1e7cc8d390"}]}