Marek Pospieszalski
type: MusicGroup
popularity: 3
followers: 480
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xf98955fcd197c96db5562e3a604ce062f46d0653dd81aa0c4f9d5ec9414a5f73
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954549
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954549
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/a892d36b-ee95-40ef-adf0-da6c8fd9b543.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/a892d36b-ee95-40ef-adf0-da6c8fd9b543.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/a892d36b-ee95-40ef-adf0-da6c8fd9b543
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T10:56:20Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xf98955fcd197c96db5562e3a604ce062f46d0653dd81aa0c4f9d5ec9414a5f73","name":"Marek Pospieszalski","registered_at":"2026-06-20T08:54:34Z","symbol":"NIM1571374","token_address":"0x8c3cb8bfbfd65d3dbef6b96d72e94f3dbf1737fd","type":"artist","uuid":"a892d36b-ee95-40ef-adf0-da6c8fd9b543"}
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 0xf98955fcd197c96db5562e3a604ce062f46d0653dd81aa0c4f9d5ec9414a5f73. Chain 2 (Bitcoin): anchored in block 954555 (2026-06-20T12:10:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a892d36b-ee95-40ef-adf0-da6c8fd9b543.json and https://artists.proofprofile.net/proofs/artist/a892d36b-ee95-40ef-adf0-da6c8fd9b543.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T12:10:20Z
  text: {"copyright_id":"0xf98955fcd197c96db5562e3a604ce062f46d0653dd81aa0c4f9d5ec9414a5f73","name":"Marek Pospieszalski","registered_at":"2026-06-20T08:54:34Z","symbol":"NIM1571374","token_address":"0x8c3cb8bfbfd65d3dbef6b96d72e94f3dbf1737fd","type":"artist","uuid":"a892d36b-ee95-40ef-adf0-da6c8fd9b543"}
album: Polish Composers of the 20th Century
  type: MusicAlbum
  date published: 2022-03-18
album: Matuszczak (Variations on a theme by Bernadetta Matuszczak „Libera Me")
  type: MusicAlbum
  date published: 2023-05-12
album: No Other End of the World Will There Be
  type: MusicAlbum
  date published: 2023-06-23