{"id":2647180,"record_url":"https://metalstack.app/2647180","status":"verified","algorithm":"SHA-256","record_hash":"3d00fd3f38a44ddd67f450826815efd3c4bb078c36b5e70f78e70d784df096cc","record_hash_recomputed":"3d00fd3f38a44ddd67f450826815efd3c4bb078c36b5e70f78e70d784df096cc","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\":2647180,\"title\":\"2024 Silver Krugerrand\",\"metal\":\"silver\",\"fineness\":\".999\",\"weight_g\":31.11,\"dims_mm\":\"D38.7 x 2.8\",\"year\":\"2024\",\"checks\":[{\"type\":\"composition\",\"instrument\":\"XRF-01\",\"result\":\"pass\",\"reading\":\"Ag 99.90%\",\"tested_at\":\"2026-06-12\"},{\"type\":\"conductivity\",\"instrument\":\"PMV-01\",\"result\":\"pass\",\"reading\":\"Ag .999 ✓\",\"tested_at\":\"2026-06-12\"},{\"type\":\"dimensions\",\"instrument\":\"CAL-01\",\"result\":\"pass\",\"reading\":\"D38.7 x 2.8 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\":\"31.11 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":"f7f02ae82fbdc15ade241c2e1decd0c686fecd8092bcdabe1a56f3e07a5ea963"},{"created_at":"2026-06-12 09:48:31","event_type":"check_recorded","detail":"Weighed: 31.11 g - SCALE-01, operator PS","prev_chain_hash":"f7f02ae82fbdc15ade241c2e1decd0c686fecd8092bcdabe1a56f3e07a5ea963","chain_hash":"e3631d2bddc61877785d26e8c5c6e99547a84a25f290537d43222261d9072f2f"},{"created_at":"2026-06-12 09:51:07","event_type":"check_recorded","detail":"Magnet & eddy-slide: non-magnetic, high-conductivity response","prev_chain_hash":"e3631d2bddc61877785d26e8c5c6e99547a84a25f290537d43222261d9072f2f","chain_hash":"a6258ed3976abd55d4de29d36c689d2dc650a4572af338f832aabf23176b8d44"},{"created_at":"2026-06-12 09:54:20","event_type":"check_recorded","detail":"Composition: Ag 99.90% - XRF-01, operator PS","prev_chain_hash":"a6258ed3976abd55d4de29d36c689d2dc650a4572af338f832aabf23176b8d44","chain_hash":"55ab8e1542dc87ce909b398ce87f412294b15f05b10a650398d57a99ef4384cf"},{"created_at":"2026-06-12 09:56:40","event_type":"check_recorded","detail":"Conductivity (secondary): Ag .999 ✓ - PMV-01 (Sigma)","prev_chain_hash":"55ab8e1542dc87ce909b398ce87f412294b15f05b10a650398d57a99ef4384cf","chain_hash":"935a3cc54eea2d50ae454af681745dd6f326f9dda87de7b312ce992dc7570377"},{"created_at":"2026-06-12 10:00:05","event_type":"check_recorded","detail":"Inspection: marks & construction consistent; no plating wear","prev_chain_hash":"935a3cc54eea2d50ae454af681745dd6f326f9dda87de7b312ce992dc7570377","chain_hash":"e5bfc6e73700a7d0bac0c032a5130f854e58b307da46315068b16e6f16398a01"},{"created_at":"2026-06-12 10:02:40","event_type":"check_recorded","detail":"Supplementary: dimensions D38.7 x 2.8 mm match spec; ping within profile","prev_chain_hash":"e5bfc6e73700a7d0bac0c032a5130f854e58b307da46315068b16e6f16398a01","chain_hash":"d404eb2c2bcf7dd6b12ca0bcf2efaebdabd113e8f7c3a2c9897bd23a13bec954"},{"created_at":"2026-06-12 10:08:15","event_type":"seal_applied","detail":"Tamper-evident hologram seal applied","prev_chain_hash":"d404eb2c2bcf7dd6b12ca0bcf2efaebdabd113e8f7c3a2c9897bd23a13bec954","chain_hash":"129bf542b2b6bf0c37d79364b1704fe78bec2b1b021cdc937c7fb93c2a03c1db"},{"created_at":"2026-06-12 10:11:23","event_type":"status_change","detail":"Record published - status: verified","prev_chain_hash":"129bf542b2b6bf0c37d79364b1704fe78bec2b1b021cdc937c7fb93c2a03c1db","chain_hash":"a26962a7c48915c14b0ccaf7a590dc1a257e4f8ff6a1b5cc5a894125091f973f"},{"created_at":"2026-06-12 10:14:02","event_type":"card_issued","detail":"Verification card MS-2647180 issued","prev_chain_hash":"a26962a7c48915c14b0ccaf7a590dc1a257e4f8ff6a1b5cc5a894125091f973f","chain_hash":"47ca153d5beefcd69992e06882579b00f25e1d5dd308f42182ed4305acaae955"}]}