Bruce Hungerford (24 November 192226 January 1977), known for the majority of his career as Leonard Hungerford, was an Australian pianist. Biography Born in Korumburra, Victoria, Bruce Hungerford wa
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 0x73d57f3db8d37898a7770b6fff3b55e7fa247caf05116c7211ff69238475aa7c. Chain 2 (Bitcoin): anchored in block 953851 (2026-06-15T23:06:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/02111ea6-d575-4254-ab63-2bc7b858bcb3.json and https://artists.proofprofile.net/proofs/artist/02111ea6-d575-4254-ab63-2bc7b858bcb3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).