thumb|right|Chromium(III) oxide sample thumb|Viridian (Pigment Green 18), left 3 smears; and Phthalocyanine Green (Pigment Green 7), right 3 smears Viridian is a blue-green pigment, a hydrated chromiu
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 0xa41605cceefd95c4ce3654efd24d18b696ced53404c9c72d36697a0a75120c54. 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/6443a95c-1276-4b37-a78f-f7a616ee4f6b.json and https://artists.proofprofile.net/proofs/artist/6443a95c-1276-4b37-a78f-f7a616ee4f6b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).