Kontra Quartet
type: MusicGroup
genre: chamber music
genre: neoclassical
popularity: 3
followers: 307
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xdd7ae00f04983a22ffa0ed2acde28563e4849f6acef0bd9e7c5c87b1a65933d3
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/c64419b6-ba81-4c12-91ec-552d1046ac7b.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/c64419b6-ba81-4c12-91ec-552d1046ac7b.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/c64419b6-ba81-4c12-91ec-552d1046ac7b
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T07:29:20Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xdd7ae00f04983a22ffa0ed2acde28563e4849f6acef0bd9e7c5c87b1a65933d3","name":"Kontra Quartet","registered_at":"2026-06-20T21:35:16Z","symbol":"NIM1720600","token_address":"0x2a0200d4439421e238713615e7bdcb1ede9eaee1","type":"artist","uuid":"c64419b6-ba81-4c12-91ec-552d1046ac7b"}
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 0xdd7ae00f04983a22ffa0ed2acde28563e4849f6acef0bd9e7c5c87b1a65933d3. 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/c64419b6-ba81-4c12-91ec-552d1046ac7b.json and https://artists.proofprofile.net/proofs/artist/c64419b6-ba81-4c12-91ec-552d1046ac7b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T07:29:20Z
  text: {"copyright_id":"0xdd7ae00f04983a22ffa0ed2acde28563e4849f6acef0bd9e7c5c87b1a65933d3","name":"Kontra Quartet","registered_at":"2026-06-20T21:35:16Z","symbol":"NIM1720600","token_address":"0x2a0200d4439421e238713615e7bdcb1ede9eaee1","type":"artist","uuid":"c64419b6-ba81-4c12-91ec-552d1046ac7b"}
album: Heise: Chamber Music
  type: MusicAlbum
  date published: 1992-02-12