Casper da Salo Quartet
type: MusicGroup
genre: chamber music
genre: classical
popularity: 2
followers: 37
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xac4c9c225004857477352a89d2edaa5535131da038fcad9c35700a3f7bf1b7ab
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954667
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954667
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/c41a8520-5f48-4493-b698-f1d9a854dc4c.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/c41a8520-5f48-4493-b698-f1d9a854dc4c.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/c41a8520-5f48-4493-b698-f1d9a854dc4c
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T07:29:20Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xac4c9c225004857477352a89d2edaa5535131da038fcad9c35700a3f7bf1b7ab","name":"Casper da Salo Quartet","registered_at":"2026-06-20T20:48:46Z","symbol":"NIM1710072","token_address":"0xff51f87a177058aeb805a4016bac56a81b9d6a2b","type":"artist","uuid":"c41a8520-5f48-4493-b698-f1d9a854dc4c"}
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 0xac4c9c225004857477352a89d2edaa5535131da038fcad9c35700a3f7bf1b7ab. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c41a8520-5f48-4493-b698-f1d9a854dc4c.json and https://artists.proofprofile.net/proofs/artist/c41a8520-5f48-4493-b698-f1d9a854dc4c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T07:29:20Z
  text: {"copyright_id":"0xac4c9c225004857477352a89d2edaa5535131da038fcad9c35700a3f7bf1b7ab","name":"Casper da Salo Quartet","registered_at":"2026-06-20T20:48:46Z","symbol":"NIM1710072","token_address":"0xff51f87a177058aeb805a4016bac56a81b9d6a2b","type":"artist","uuid":"c41a8520-5f48-4493-b698-f1d9a854dc4c"}
album: Haydn: String Quartets Nos. 1, 2, 3 & 5 "Lark", Op. 64
  type: MusicAlbum
  date published: 2009-01-01