{"id":5817209,"record_url":"https://metalstack.app/5817209","status":"listed","algorithm":"SHA-256","record_hash":"b678843d08413e36fe97410cb1e5fcf5a2be3ae72d9a26a4307c71708831fd16","record_hash_recomputed":"b678843d08413e36fe97410cb1e5fcf5a2be3ae72d9a26a4307c71708831fd16","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\":5817209,\"title\":\"2026 Gold Britannia 1 oz\",\"metal\":\"gold\",\"fineness\":\".9999\",\"weight_g\":31.16,\"dims_mm\":\"D38.6 x 2.8\",\"year\":\"2026\",\"checks\":[{\"type\":\"composition\",\"instrument\":\"XRF-01\",\"result\":\"pass\",\"reading\":\"Au 99.97%\",\"tested_at\":\"2026-06-11\"},{\"type\":\"conductivity\",\"instrument\":\"PMV-01\",\"result\":\"pass\",\"reading\":\"Au .9999 ✓\",\"tested_at\":\"2026-06-11\"},{\"type\":\"dimensions\",\"instrument\":\"CAL-01\",\"result\":\"pass\",\"reading\":\"D38.6 x 2.8 mm - matches published spec\",\"tested_at\":\"2026-06-11\"},{\"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\":\"2026-06-11\"},{\"type\":\"magnet\",\"instrument\":null,\"result\":\"pass\",\"reading\":\"Non-magnetic; eddy-slide consistent with high-conductivity metal\",\"tested_at\":\"2026-06-11\"},{\"type\":\"ping\",\"instrument\":null,\"result\":\"pass\",\"reading\":\"Resonance within expected profile\",\"tested_at\":\"2026-06-11\"},{\"type\":\"weight\",\"instrument\":\"SCALE-01\",\"result\":\"pass\",\"reading\":\"31.16 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":"bd606a68eb0b5a30f874ddd85fbeb19d15bcf25e1bd3f68c4839e3e2ab296380"},{"created_at":"2026-06-11 09:48:31","event_type":"check_recorded","detail":"Weighed: 31.16 g - SCALE-01, operator PS","prev_chain_hash":"bd606a68eb0b5a30f874ddd85fbeb19d15bcf25e1bd3f68c4839e3e2ab296380","chain_hash":"dc7523441278d9cb14b871fdb1f0e984b77b24f265bb7201f071d1677d4d8dc4"},{"created_at":"2026-06-11 09:51:07","event_type":"check_recorded","detail":"Magnet & eddy-slide: non-magnetic, high-conductivity response","prev_chain_hash":"dc7523441278d9cb14b871fdb1f0e984b77b24f265bb7201f071d1677d4d8dc4","chain_hash":"ed4832d9f62193c628173d361da1b14dae36c8c4f7c51e2c62618f56292896ec"},{"created_at":"2026-06-11 09:54:20","event_type":"check_recorded","detail":"Composition: Au 99.97% - XRF-01, operator PS","prev_chain_hash":"ed4832d9f62193c628173d361da1b14dae36c8c4f7c51e2c62618f56292896ec","chain_hash":"1f86d868fed6705600c44b53482e3d6a473886ad94a48e15eb843ffd96709761"},{"created_at":"2026-06-11 09:56:40","event_type":"check_recorded","detail":"Conductivity (secondary): Au .9999 ✓ - PMV-01 (Sigma)","prev_chain_hash":"1f86d868fed6705600c44b53482e3d6a473886ad94a48e15eb843ffd96709761","chain_hash":"833dc6c76557732b8d8937a7b016063747dc44a60d9744ebf10a68b28695ab03"},{"created_at":"2026-06-11 10:00:05","event_type":"check_recorded","detail":"Inspection: marks & construction consistent; no plating wear","prev_chain_hash":"833dc6c76557732b8d8937a7b016063747dc44a60d9744ebf10a68b28695ab03","chain_hash":"8a636ada46cc5f0e659b9bc046a78767e7f16e7e6bbb942c5f746697ffe42144"},{"created_at":"2026-06-11 10:02:40","event_type":"check_recorded","detail":"Supplementary: dimensions D38.6 x 2.8 mm match spec; ping within profile","prev_chain_hash":"8a636ada46cc5f0e659b9bc046a78767e7f16e7e6bbb942c5f746697ffe42144","chain_hash":"8da3e8425fdbb594b24e9a9cada59fa05ad2b6c80210ae60557f91097d6c28d1"},{"created_at":"2026-06-11 10:08:15","event_type":"seal_applied","detail":"Tamper-evident hologram seal applied","prev_chain_hash":"8da3e8425fdbb594b24e9a9cada59fa05ad2b6c80210ae60557f91097d6c28d1","chain_hash":"0699b4f355d128804fc090d8523bcac5f1572b72912a515398543016be79821e"},{"created_at":"2026-06-11 10:11:23","event_type":"status_change","detail":"Record published - status: verified","prev_chain_hash":"0699b4f355d128804fc090d8523bcac5f1572b72912a515398543016be79821e","chain_hash":"5d231b351f30894b63a6c3f4c41c4a732c1684189939976bbced00d263a5f7cf"},{"created_at":"2026-06-11 10:14:02","event_type":"card_issued","detail":"Verification card MS-5817209 issued","prev_chain_hash":"5d231b351f30894b63a6c3f4c41c4a732c1684189939976bbced00d263a5f7cf","chain_hash":"ae0b77715de51e4e5af9165ab1a0db0ffdbaad5ebd729a362c6b932c1e022925"},{"created_at":"2026-06-11 12:30:00","event_type":"status_change","detail":"Listed for sale","prev_chain_hash":"ae0b77715de51e4e5af9165ab1a0db0ffdbaad5ebd729a362c6b932c1e022925","chain_hash":"b48685f21aa888a97ccc043ebc70f9ef3aa14e1763bf236eee96a09a78966eb1"}]}