Robert (alias Bobby Dean) Blackburn (born 1940) is a Canadian blues and rock ‘n’ roll musician. Blackburn is known as a major contributor to Toronto’s bustling Yonge Street in the blues heyday of the
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24625a1e32c4b71a1cddf65bdcd73cdfaab1b1124f48852ba6c7e1c721511a8. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dec9369c-6e15-469a-a409-476209e1009e.json and https://artists.proofprofile.net/proofs/artist/dec9369c-6e15-469a-a409-476209e1009e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).