Leonkoro Quartet
type: MusicGroup
genre: chamber music
description: The Leonkoro Quartet is a string quartet, formed in 2019 and based in Berlin, Germany. In April 2022, the quartet won first prize and no less than 9 of the special prizes at the prestigious Wigmore
popularity: 3
followers: 557
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x4610f2c1fd530ae0772290f370e41b7eff51d0eaa7736f8bf19464a051c232a4
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/94fcf833-cdab-4137-b9d3-90062a0746fa.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/94fcf833-cdab-4137-b9d3-90062a0746fa.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/94fcf833-cdab-4137-b9d3-90062a0746fa
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:51:26Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x4610f2c1fd530ae0772290f370e41b7eff51d0eaa7736f8bf19464a051c232a4","name":"Leonkoro Quartet","registered_at":"2026-06-17T17:38:00Z","symbol":"NIM1469393","token_address":"0xbe0cc6c71a1bfbca75cfc43950d0c2c89e5ebc1c","type":"artist","uuid":"94fcf833-cdab-4137-b9d3-90062a0746fa"}
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 0x4610f2c1fd530ae0772290f370e41b7eff51d0eaa7736f8bf19464a051c232a4. 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/94fcf833-cdab-4137-b9d3-90062a0746fa.json and https://artists.proofprofile.net/proofs/artist/94fcf833-cdab-4137-b9d3-90062a0746fa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:51:26Z
  text: {"copyright_id":"0x4610f2c1fd530ae0772290f370e41b7eff51d0eaa7736f8bf19464a051c232a4","name":"Leonkoro Quartet","registered_at":"2026-06-17T17:38:00Z","symbol":"NIM1469393","token_address":"0xbe0cc6c71a1bfbca75cfc43950d0c2c89e5ebc1c","type":"artist","uuid":"94fcf833-cdab-4137-b9d3-90062a0746fa"}
album: Ravel, Schumann: String Quartets
  type: MusicAlbum
  date published: 2023-09-01