{"id":3424433,"record_url":"https://metalstack.app/3424433","status":"sold","algorithm":"SHA-256","record_hash":"793dfefc343b726799743d96f63fdb3fcdafc6213b6ae9e66ac6692c7213e1d8","record_hash_recomputed":"793dfefc343b726799743d96f63fdb3fcdafc6213b6ae9e66ac6692c7213e1d8","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\":3424433,\"title\":\"1 oz Cast Silver Bar\",\"metal\":\"silver\",\"fineness\":\".999\",\"weight_g\":31.21,\"dims_mm\":\"44.1 x 25.8 x 3.4\",\"year\":null,\"checks\":[{\"type\":\"composition\",\"instrument\":\"XRF-01\",\"result\":\"pass\",\"reading\":\"Ag 99.91%\",\"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\":\"44.1 x 25.8 x 3.4 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\":\"31.21 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":"f2bd0e658a3cb84c0a130812e0a0d8b71f3d2e21b4bf65f53dd719a8e48817ea"},{"created_at":"2026-06-11 09:48:31","event_type":"check_recorded","detail":"Weighed: 31.21 g - SCALE-01, operator PS","prev_chain_hash":"f2bd0e658a3cb84c0a130812e0a0d8b71f3d2e21b4bf65f53dd719a8e48817ea","chain_hash":"f7859c16437a49f1e1754a1942885ddeee1e72a1e4bd14bc3467d37f944492fa"},{"created_at":"2026-06-11 09:51:07","event_type":"check_recorded","detail":"Magnet & eddy-slide: non-magnetic, high-conductivity response","prev_chain_hash":"f7859c16437a49f1e1754a1942885ddeee1e72a1e4bd14bc3467d37f944492fa","chain_hash":"d8470c0f3de6b1b94aa0c796f00f0958b7477e5afde2c353fab1f80c2c3825c0"},{"created_at":"2026-06-11 09:54:20","event_type":"check_recorded","detail":"Composition: Ag 99.91% - XRF-01, operator PS","prev_chain_hash":"d8470c0f3de6b1b94aa0c796f00f0958b7477e5afde2c353fab1f80c2c3825c0","chain_hash":"5209cc32e33844c701d2e4cafab008b1e157303f8df77ef26bb25094b2a1b242"},{"created_at":"2026-06-11 09:56:40","event_type":"check_recorded","detail":"Conductivity (secondary): Ag .999 ✓ - PMV-01 (Sigma)","prev_chain_hash":"5209cc32e33844c701d2e4cafab008b1e157303f8df77ef26bb25094b2a1b242","chain_hash":"8e0e8aedb63ebe3fd1e1430241ec73a2e258c2671c6bd101670ebb5139eba87e"},{"created_at":"2026-06-11 10:00:05","event_type":"check_recorded","detail":"Inspection: marks & construction consistent; no plating wear","prev_chain_hash":"8e0e8aedb63ebe3fd1e1430241ec73a2e258c2671c6bd101670ebb5139eba87e","chain_hash":"27680a3231d2751f2939c01b3aa227b80a1faced206a217c7e2e0b693bfa3b72"},{"created_at":"2026-06-11 10:02:40","event_type":"check_recorded","detail":"Supplementary: dimensions 44.1 x 25.8 x 3.4 mm match spec","prev_chain_hash":"27680a3231d2751f2939c01b3aa227b80a1faced206a217c7e2e0b693bfa3b72","chain_hash":"cdb33fd84095d353c83de936fd57338e591b53e60969b39431516d59cfcb6be0"},{"created_at":"2026-06-11 10:08:15","event_type":"seal_applied","detail":"Tamper-evident hologram seal applied","prev_chain_hash":"cdb33fd84095d353c83de936fd57338e591b53e60969b39431516d59cfcb6be0","chain_hash":"dacee87e7e595f9a23374a8443794468694224e2575dce6ad4cd0eaa62750e94"},{"created_at":"2026-06-11 10:11:23","event_type":"status_change","detail":"Record published - status: verified","prev_chain_hash":"dacee87e7e595f9a23374a8443794468694224e2575dce6ad4cd0eaa62750e94","chain_hash":"b1eeb93d3c4050f83cd02f2e73efebe8df5d126b87050631526086d3925d65b4"},{"created_at":"2026-06-11 10:14:02","event_type":"card_issued","detail":"Verification card MS-3424433 issued","prev_chain_hash":"b1eeb93d3c4050f83cd02f2e73efebe8df5d126b87050631526086d3925d65b4","chain_hash":"26d4b69893bb0dcc2db4b79001a9287e080bb0d8a83fa1c2af6e84d0a4983038"},{"created_at":"2026-06-11 16:45:00","event_type":"status_change","detail":"Sold - record remains live as archive","prev_chain_hash":"26d4b69893bb0dcc2db4b79001a9287e080bb0d8a83fa1c2af6e84d0a4983038","chain_hash":"93a980342f5496180ffabfd1a62d5232da037e968637c6d63681179ac75865a0"},{"created_at":"2026-06-11 16:46:30","event_type":"ownership_transfer","detail":"Ownership transferred - re-registered to a new keeper","prev_chain_hash":"93a980342f5496180ffabfd1a62d5232da037e968637c6d63681179ac75865a0","chain_hash":"4af1682605ea181a39bd66103c8831759ea96b734a203d155aa303a5e108a55e"},{"created_at":"2026-06-11 17:10:00","event_type":"reverified","detail":"Re-verified on the bench - checks re-confirmed","prev_chain_hash":"4af1682605ea181a39bd66103c8831759ea96b734a203d155aa303a5e108a55e","chain_hash":"47f25a94ec8e9cfb91c507fe943b8b6ada26f00899a1325e29cf652b9d922df9"}]}