Young Voices organise children's choir concerts around the UK. Starting in 1997., the concerts have grown in number and size of venue, now requiring the largest arenas in the UK. The children rehearse
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 0x2bc866757db289ead6b5fdb43439d02de5e3e9411cd151261b9d41dd5505bc09. 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/9e05380c-5961-4a43-a74d-db17ed26a22b.json and https://artists.proofprofile.net/proofs/artist/9e05380c-5961-4a43-a74d-db17ed26a22b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).