The Celtic Harp Orchestra (CHO), founded in 2002 by Fabius Constable, is a musical formation composed primarily of lever harps, or Celtic harps, as they are commonly known, alongside other instruments
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 0x8a883e8991491cfb6215edf1dff1919030ad391602dfbf95866118593f83b812. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cab16ce4-02fa-4885-a64c-39ceeeca8671.json and https://artists.proofprofile.net/proofs/artist/cab16ce4-02fa-4885-a64c-39ceeeca8671.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.