thumb|upright=1.3|An Audi Sport Quattro S1 E2, one of the most powerful Group B cars Group B was a set of regulations for grand touring (GT) cars used in sports car racing and rallying introduced in
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 0x5c3bbf667071c5d13b06336e87a3f891dbd7467320b433446acc790fe7398333. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4d0a1bf4-e051-40a5-817f-e14ac3c601d2.json and https://artists.proofprofile.net/proofs/artist/4d0a1bf4-e051-40a5-817f-e14ac3c601d2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).