thumb|right|Eva Fischer Eva Fischer (Daruvar, 19 November 1920 – Rome, 7 July 2015) was a Croatia-born Italian artist who worked in oils, watercolours, engraving and lithography.Recupero, J. 39 Engra
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e3c4afb5a35289daaa62c46dfa3650e2119309f6f09f22cf2fa3d961bdf8143. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/57efb1f4-2028-43a5-9c21-738e335928f0.json and https://artists.proofprofile.net/proofs/artist/57efb1f4-2028-43a5-9c21-738e335928f0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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