Piotr V. Spassky
type: MusicGroup
genre: choral
genre: medieval
popularity: 4
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xa0fba0f164bf47265b772bb6200838389d7e2d38b6651b35424d150769523c1c
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953907
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953907
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/17120fbb-823e-4baa-a95c-3e81acf07dc0.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/17120fbb-823e-4baa-a95c-3e81acf07dc0.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/17120fbb-823e-4baa-a95c-3e81acf07dc0
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T07:39:24Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xa0fba0f164bf47265b772bb6200838389d7e2d38b6651b35424d150769523c1c","name":"Piotr V. Spassky","registered_at":"2026-06-15T21:39:42Z","symbol":"NIM0839887","token_address":"0xa4a1ab93fc1d97141271a052c719180216ba4c42","type":"artist","uuid":"17120fbb-823e-4baa-a95c-3e81acf07dc0"}
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 0xa0fba0f164bf47265b772bb6200838389d7e2d38b6651b35424d150769523c1c. Chain 2 (Bitcoin): anchored in block 953907 (2026-06-16T07:39:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/17120fbb-823e-4baa-a95c-3e81acf07dc0.json and https://artists.proofprofile.net/proofs/artist/17120fbb-823e-4baa-a95c-3e81acf07dc0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T07:39:24Z
  text: {"copyright_id":"0xa0fba0f164bf47265b772bb6200838389d7e2d38b6651b35424d150769523c1c","name":"Piotr V. Spassky","registered_at":"2026-06-15T21:39:42Z","symbol":"NIM0839887","token_address":"0xa4a1ab93fc1d97141271a052c719180216ba4c42","type":"artist","uuid":"17120fbb-823e-4baa-a95c-3e81acf07dc0"}