Bruce Boyce (1910 – 11 May 1996) was a prominent Canadian-born American baritone singer of opera, oratorio and lieder, who made his postwar career in Britain and became a professor at the Royal Academ
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 0xb0836b536c6c1a5c9c2e245484a5f4cfd795c6770da99f66b8da2f2db1562f37. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bf805f8c-9b8d-4e23-8195-d53d487f7843.json and https://artists.proofprofile.net/proofs/artist/bf805f8c-9b8d-4e23-8195-d53d487f7843.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).