The Derba (), also known as Derbe (; , Cerbe) or Dzherba (), is a river in Yakutia (Sakha Republic), Russia. It is a tributary of the Lena with a length of — counting the Mas-Turukhtaakh at its he
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 0xac6a08366bede85a7eb85282a1bb336f0941a7798647f5714926963572ec5d01. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/528eb6fa-a04f-4c01-a1c8-7b6a2abce61c.json and https://artists.proofprofile.net/proofs/artist/528eb6fa-a04f-4c01-a1c8-7b6a2abce61c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).