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 0xce7b549f33b45dec5e63910c1a96e0218777f3d14f4f3d0036615c36ecf073c3. Chain 2 (Bitcoin): anchored in block 953959 (2026-06-16T14:51:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/27a6a7d9-a813-4c6b-a6ca-8941999a3f2e.json and https://artists.proofprofile.net/proofs/artist/27a6a7d9-a813-4c6b-a6ca-8941999a3f2e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).