thumb|right|upright=1.3|A variety of rulers thumb|right|A carpenter's rule thumb|right|Retractable flexible rule or tape measure thumb|right|A closeup of a steel ruler thumb|A ruler in combination wit
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 0xfe3fd5b878c08e1bafe87d39dcd34df9ba2fe4031ce211ab03720b3a2d60ad30. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/246f9066-3b60-4f11-8dbe-603b9954ebff.json and https://artists.proofprofile.net/proofs/artist/246f9066-3b60-4f11-8dbe-603b9954ebff.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).