ACO, AcO, or Aco may refer to: Aviation Air Cadet Organisation, collective name for the UK cadet forces sponsored by the Royal Air Force The Airline Cooperative, an organization of international ai
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 0xda746c3b6fe40813164c928bab6f908a88491f5ad74313642a6aea1f63f12b14. 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/6279cfe6-000e-4b0b-b34d-72c7cabd7ac9.json and https://artists.proofprofile.net/proofs/artist/6279cfe6-000e-4b0b-b34d-72c7cabd7ac9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).