thumb|400px|right|Burlaks on the Volga (painting by Ilya Repin, 1870–73) A burlak () was a river boat or barge puller in the Russian Empire. It was a seasonal occupation.Виноградовв Д. В.,История бурл
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 0xdabbaa24b4ad3fef7198a06a78e6c86aebb6c2400d6f63d538ac6c3d75e76e81. 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/5a3fbe41-27b4-402a-8cfc-8b90c61b5ef5.json and https://artists.proofprofile.net/proofs/artist/5a3fbe41-27b4-402a-8cfc-8b90c61b5ef5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).