300px|thumb|Detailed French map of 1882, showing position of Osh (here spelled "Osch", slightly right of centre, beside the Uzbek city of "Andidjâne") in the Fergana valley Osh (, , ) is the second-
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 0xa01de8bd7c3c4efbebba9b4826f2f234bacd900d7a53f422dbb0362889dc4998. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/82fb2a1e-9bef-48c9-ade8-daa7a3df4f9e.json and https://artists.proofprofile.net/proofs/artist/82fb2a1e-9bef-48c9-ade8-daa7a3df4f9e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).