Quartetto Sandro Materassi
type: MusicGroup
genre: chamber music
popularity: 2
followers: 83
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xb9e22c90c994f5cfd10dd6ce632c9324683893cfea87a8746d949277a34d5009
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954618
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954618
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/c7a4f2c5-e2ac-4e01-9d14-eca39ee403cd.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/c7a4f2c5-e2ac-4e01-9d14-eca39ee403cd.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/c7a4f2c5-e2ac-4e01-9d14-eca39ee403cd
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T23:05:13Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xb9e22c90c994f5cfd10dd6ce632c9324683893cfea87a8746d949277a34d5009","name":"Quartetto Sandro Materassi","registered_at":"2026-06-20T21:59:41Z","symbol":"NIM1723789","token_address":"0xadefa06342d760738d360b47f8a284f20800e0df","type":"artist","uuid":"c7a4f2c5-e2ac-4e01-9d14-eca39ee403cd"}
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 0xb9e22c90c994f5cfd10dd6ce632c9324683893cfea87a8746d949277a34d5009. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c7a4f2c5-e2ac-4e01-9d14-eca39ee403cd.json and https://artists.proofprofile.net/proofs/artist/c7a4f2c5-e2ac-4e01-9d14-eca39ee403cd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T23:05:13Z
  text: {"copyright_id":"0xb9e22c90c994f5cfd10dd6ce632c9324683893cfea87a8746d949277a34d5009","name":"Quartetto Sandro Materassi","registered_at":"2026-06-20T21:59:41Z","symbol":"NIM1723789","token_address":"0xadefa06342d760738d360b47f8a284f20800e0df","type":"artist","uuid":"c7a4f2c5-e2ac-4e01-9d14-eca39ee403cd"}