Darab () is a city in the Central District of Darab County, Fars province, Iran, serving as capital of both the county and the district. History Darab is one of the oldest cities in Iran, and is ment
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdbe455f78b528bc81e119dd42ff7213cd90f1967f893301d613c4e4d98b6c40. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b781cc3c-ac8e-46f5-b027-9cf00e7ccc19.json and https://artists.proofprofile.net/proofs/artist/b781cc3c-ac8e-46f5-b027-9cf00e7ccc19.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).