thumb|right|Barthel 1932 Karl Barthel (20 March 1907 – 21 February 1974) was a German politician, Communist member of the Reichstag during the Weimar Republic, concentration camp survivor, Socialist
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 0xd29424f1ac7c65d70b8e744985fa9446bf84ea487c3797948c60e1d9db71d707. 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/4bc2fa21-d37e-4777-a4d6-742a3abdc3de.json and https://artists.proofprofile.net/proofs/artist/4bc2fa21-d37e-4777-a4d6-742a3abdc3de.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).