Brendan Christopher Croker (15 August 1953 – 10 September 2023) was an English musician, who recorded albums under his own name and with an occasional backing band, The Five O'Clock Shadows. Early l
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 0x260b777c9aed40068f9b5dc0eff5e92d97122bed4d8cb0511a886606d9e1c51d. Chain 2 (Bitcoin): anchored in block 953968 (2026-06-16T16:01:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2971fc23-fca4-441f-95e8-5642a2757239.json and https://artists.proofprofile.net/proofs/artist/2971fc23-fca4-441f-95e8-5642a2757239.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).