thumb|Arche de Noé (Teddy Bear Jacket), Winter 1988-89 (RISD Museum) Jean-Charles, marquis de Castelbajac (born 28 November 1949), also known as JC/DC, is a French fashion designer. Career He has e
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 0xd37455feb474a71a575eac8d6b39788b6b819f1e42d915e595bcd8d69c3889ce. Chain 2 (Bitcoin): anchored in block 954115 (2026-06-17T15:44:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7a725b7e-81c9-41bf-924c-08433c26271f.json and https://artists.proofprofile.net/proofs/artist/7a725b7e-81c9-41bf-924c-08433c26271f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).