Castalian String Quartet
type: MusicGroup
genre: chamber music
popularity: 2
followers: 261
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x3bc2b1c56473babab9e77d13e4644f0d9c5898e009cc7d702e2b0d74485a54ec
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954346
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954346
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9a4b8ffc-afbd-4aae-93ff-a047eedb9c83.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9a4b8ffc-afbd-4aae-93ff-a047eedb9c83.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/9a4b8ffc-afbd-4aae-93ff-a047eedb9c83
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:51:26Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x3bc2b1c56473babab9e77d13e4644f0d9c5898e009cc7d702e2b0d74485a54ec","name":"Castalian String Quartet","registered_at":"2026-06-17T19:31:25Z","symbol":"NIM1496457","token_address":"0x02caa92f788602fcb5a9ca503c1dbcf7da91e09c","type":"artist","uuid":"9a4b8ffc-afbd-4aae-93ff-a047eedb9c83"}
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 0x3bc2b1c56473babab9e77d13e4644f0d9c5898e009cc7d702e2b0d74485a54ec. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9a4b8ffc-afbd-4aae-93ff-a047eedb9c83.json and https://artists.proofprofile.net/proofs/artist/9a4b8ffc-afbd-4aae-93ff-a047eedb9c83.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:51:26Z
  text: {"copyright_id":"0x3bc2b1c56473babab9e77d13e4644f0d9c5898e009cc7d702e2b0d74485a54ec","name":"Castalian String Quartet","registered_at":"2026-06-17T19:31:25Z","symbol":"NIM1496457","token_address":"0x02caa92f788602fcb5a9ca503c1dbcf7da91e09c","type":"artist","uuid":"9a4b8ffc-afbd-4aae-93ff-a047eedb9c83"}
album: Between Two Worlds: Lassus, Beethoven, Adès & Dowland
  type: MusicAlbum
  date published: 2022-04-29