thumb|Painting with acrylic paint on the reverse side of an already inked cel. A cel, short for celluloid, is a transparent sheet on which objects are drawn or painted for traditional, classical, ha
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 0x1216f8e54ebfd38cab7c41eddece7ed8cc4fdd1c19f3277ed4948e2c2bad1425. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/be22abd1-4b90-4596-a350-0ef66854a590.json and https://artists.proofprofile.net/proofs/artist/be22abd1-4b90-4596-a350-0ef66854a590.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).