Calum Gourlay
type: MusicGroup
description: 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
popularity: 5
followers: 108
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x15a8d2c77f6e819b87866e1351282d663870e672f53ca454e4c446d1fd8b3a97
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954500
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954500
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9ba77c53-ec78-447a-805e-788831f5fece.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9ba77c53-ec78-447a-805e-788831f5fece.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/9ba77c53-ec78-447a-805e-788831f5fece
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T04:47:29Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x15a8d2c77f6e819b87866e1351282d663870e672f53ca454e4c446d1fd8b3a97","name":"Calum Gourlay","registered_at":"2026-06-20T04:10:37Z","symbol":"NIM1507027","token_address":"0xea2321ef567e985f7dccc55f0698d5a361958982","type":"artist","uuid":"9ba77c53-ec78-447a-805e-788831f5fece"}
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: 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).
  date published: 2026-06-20T04:47:29Z
  text: {"copyright_id":"0x15a8d2c77f6e819b87866e1351282d663870e672f53ca454e4c446d1fd8b3a97","name":"Calum Gourlay","registered_at":"2026-06-20T04:10:37Z","symbol":"NIM1507027","token_address":"0xea2321ef567e985f7dccc55f0698d5a361958982","type":"artist","uuid":"9ba77c53-ec78-447a-805e-788831f5fece"}