Bartella (; ) is a town that is located in the Nineveh Plains in northern Iraq, about east of Mosul. Bartella was liberated from ISIL control on October 20, 2016, by Iraqi Special Operations Forces
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 0x3bcee634e57a336d9017ab16b740e8030a6f791eceb305782da13de1fdb30745. 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/64509130-dc43-4d7f-adbe-658c08c348f3.json and https://artists.proofprofile.net/proofs/artist/64509130-dc43-4d7f-adbe-658c08c348f3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).