Calum Gourlay is a Scottish jazz bassist, composer, and band leader. Career The son of a music teacher, Gourlay grew up in Glasgow. At the age of ten he began learning the cello, then four years late
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 0x15a8d2c77f6e819b87866e1351282d663870e672f53ca454e4c446d1fd8b3a97. Chain 2 (Bitcoin): anchored in block 954500 (2026-06-20T04:47:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9ba77c53-ec78-447a-805e-788831f5fece.json and https://artists.proofprofile.net/proofs/artist/9ba77c53-ec78-447a-805e-788831f5fece.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).