On Call Vocals
type: MusicGroup
genre: opm
popularity: 4
followers: 179
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x602fe5c4624ccabc900a8ae826898e33491833769eea1237150855534e8902d7
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954623
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954623
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/cc018c4a-ba16-4a70-80e5-288f0be74636.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/cc018c4a-ba16-4a70-80e5-288f0be74636.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/cc018c4a-ba16-4a70-80e5-288f0be74636
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T23:40:06Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x602fe5c4624ccabc900a8ae826898e33491833769eea1237150855534e8902d7","name":"On Call Vocals","registered_at":"2026-06-20T23:18:55Z","symbol":"NIM1745041","token_address":"0xb31848ed27179efc07bfd73ec18e43444395f9c4","type":"artist","uuid":"cc018c4a-ba16-4a70-80e5-288f0be74636"}
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 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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x602fe5c4624ccabc900a8ae826898e33491833769eea1237150855534e8902d7. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cc018c4a-ba16-4a70-80e5-288f0be74636.json and https://artists.proofprofile.net/proofs/artist/cc018c4a-ba16-4a70-80e5-288f0be74636.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T23:40:06Z
  text: {"copyright_id":"0x602fe5c4624ccabc900a8ae826898e33491833769eea1237150855534e8902d7","name":"On Call Vocals","registered_at":"2026-06-20T23:18:55Z","symbol":"NIM1745041","token_address":"0xb31848ed27179efc07bfd73ec18e43444395f9c4","type":"artist","uuid":"cc018c4a-ba16-4a70-80e5-288f0be74636"}
album: The Best of on Call Vocals, Vol. 1
  type: MusicAlbum
  date published: 2019-09-09
album: The Best of on Call Vocals, Vol. 2
  type: MusicAlbum
  date published: 2020-04-21
album: The Best of on Call Vocals, Vol. 2
  type: MusicAlbum
  date published: 2020-04-21