Sirena Recorder Quartet
type: MusicGroup
genre: japanese classical
popularity: 4
followers: 319
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x7a2fe58eec0ae266c15148f5a12d98eac1812d426c58523e64ab6545409db91f
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/15bae423-ef9b-4c98-8e54-7096492ee9ef.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/15bae423-ef9b-4c98-8e54-7096492ee9ef.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/15bae423-ef9b-4c98-8e54-7096492ee9ef
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T07:39:24Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x7a2fe58eec0ae266c15148f5a12d98eac1812d426c58523e64ab6545409db91f","name":"Sirena Recorder Quartet","registered_at":"2026-06-15T21:10:55Z","symbol":"NIM0833023","token_address":"0x20894b213d3e6d8be5559645ac2b6d305c9160a4","type":"artist","uuid":"15bae423-ef9b-4c98-8e54-7096492ee9ef"}
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 0x7a2fe58eec0ae266c15148f5a12d98eac1812d426c58523e64ab6545409db91f. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/15bae423-ef9b-4c98-8e54-7096492ee9ef.json and https://artists.proofprofile.net/proofs/artist/15bae423-ef9b-4c98-8e54-7096492ee9ef.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T13:28:01Z
  text: {"copyright_id":"0x7a2fe58eec0ae266c15148f5a12d98eac1812d426c58523e64ab6545409db91f","name":"Sirena Recorder Quartet","registered_at":"2026-06-15T21:10:55Z","symbol":"NIM0833023","token_address":"0x20894b213d3e6d8be5559645ac2b6d305c9160a4","type":"artist","uuid":"15bae423-ef9b-4c98-8e54-7096492ee9ef"}
album: Now & Then
  type: MusicAlbum
  date published: 2015-02-03