The Dujka Brothers
type: MusicGroup
genre: polka
popularity: 6
followers: 484
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xc0c488a4df49fff7b09c6034d321eb33e57fd34aede4e37fbb72859416bc9219
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953959
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953959
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/26d48469-c3cb-4c9b-9410-0e569ae09c9f.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/26d48469-c3cb-4c9b-9410-0e569ae09c9f.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/26d48469-c3cb-4c9b-9410-0e569ae09c9f
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T14:51:55Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xc0c488a4df49fff7b09c6034d321eb33e57fd34aede4e37fbb72859416bc9219","name":"The Dujka Brothers","registered_at":"2026-06-16T03:22:34Z","symbol":"NIM0921749","token_address":"0xe60902007d1b0e4360638200f4108f8ea8cbb2df","type":"artist","uuid":"26d48469-c3cb-4c9b-9410-0e569ae09c9f"}
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 0xc0c488a4df49fff7b09c6034d321eb33e57fd34aede4e37fbb72859416bc9219. Chain 2 (Bitcoin): anchored in block 953959 (2026-06-16T14:51:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/26d48469-c3cb-4c9b-9410-0e569ae09c9f.json and https://artists.proofprofile.net/proofs/artist/26d48469-c3cb-4c9b-9410-0e569ae09c9f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T14:51:55Z
  text: {"copyright_id":"0xc0c488a4df49fff7b09c6034d321eb33e57fd34aede4e37fbb72859416bc9219","name":"The Dujka Brothers","registered_at":"2026-06-16T03:22:34Z","symbol":"NIM0921749","token_address":"0xe60902007d1b0e4360638200f4108f8ea8cbb2df","type":"artist","uuid":"26d48469-c3cb-4c9b-9410-0e569ae09c9f"}
album: On St. John Road
  type: MusicAlbum
  date published: 2003-10-01
album: 25 Years Making Tracks
  type: MusicAlbum
  date published: 2011-11-17