IRO, Iro, or iro may refer to: Organizations Institution of Railway Operators (Chartered Institution of Railway Operators since October 2021) Internal Revolutionary Organization, Bulgaria Internat
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 0x9a90a7783f7b94e27ab38604ffb0d517a523aa29bab0f0530ec757a91f9b46eb. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9ff0ff36-0c84-4451-85c3-0033165b31b8.json and https://artists.proofprofile.net/proofs/artist/9ff0ff36-0c84-4451-85c3-0033165b31b8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).