Jan Łukaszewski
type: MusicGroup
genre: choral
genre: minimalism
popularity: 19
followers: 183
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x61d29b09823da2e5c9960b3f2a90ba2052ce685dea450d196cc86a31722a4a02
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953605
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953605
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/11e62734-059e-4f5d-869f-e996c209eec6.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/11e62734-059e-4f5d-869f-e996c209eec6.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/11e62734-059e-4f5d-869f-e996c209eec6
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-14T07:39:50Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x61d29b09823da2e5c9960b3f2a90ba2052ce685dea450d196cc86a31722a4a02","name":"Jan Łukaszewski","registered_at":"2026-06-14T06:16:38Z","symbol":"NIM0364356","token_address":"0xbbcfa7aec9571a2197150488ee531e775e029b46","type":"artist","uuid":"11e62734-059e-4f5d-869f-e996c209eec6"}
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 0x61d29b09823da2e5c9960b3f2a90ba2052ce685dea450d196cc86a31722a4a02. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/11e62734-059e-4f5d-869f-e996c209eec6.json and https://artists.proofprofile.net/proofs/artist/11e62734-059e-4f5d-869f-e996c209eec6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-14T07:39:50Z
  text: {"copyright_id":"0x61d29b09823da2e5c9960b3f2a90ba2052ce685dea450d196cc86a31722a4a02","name":"Jan Łukaszewski","registered_at":"2026-06-14T06:16:38Z","symbol":"NIM0364356","token_address":"0xbbcfa7aec9571a2197150488ee531e775e029b46","type":"artist","uuid":"11e62734-059e-4f5d-869f-e996c209eec6"}
album: Musica Polonica Nova Warsaw Composers, Vol. 1 (21st Century Polish Choral Music - World Premeire Recording)
  type: MusicAlbum
  date published: 2020-01-01