Marek Piekarczyk
type: MusicGroup
popularity: 13
followers: 4456
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xd46164387606b9d74da93c57a03f9ebd343835df30031e4127001793b8df5647
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953842
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953842
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/fc2348dd-91e9-45d8-abe1-468cfb14d99d.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/fc2348dd-91e9-45d8-abe1-468cfb14d99d.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/fc2348dd-91e9-45d8-abe1-468cfb14d99d
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T22:22:30Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xd46164387606b9d74da93c57a03f9ebd343835df30031e4127001793b8df5647","name":"Marek Piekarczyk","registered_at":"2026-06-15T06:55:38Z","symbol":"NIM0717237","token_address":"0x4c285ea70dc5cc388a49ad7493da39ea9868183e","type":"artist","uuid":"fc2348dd-91e9-45d8-abe1-468cfb14d99d"}
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 0xd46164387606b9d74da93c57a03f9ebd343835df30031e4127001793b8df5647. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fc2348dd-91e9-45d8-abe1-468cfb14d99d.json and https://artists.proofprofile.net/proofs/artist/fc2348dd-91e9-45d8-abe1-468cfb14d99d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T22:22:30Z
  text: {"copyright_id":"0xd46164387606b9d74da93c57a03f9ebd343835df30031e4127001793b8df5647","name":"Marek Piekarczyk","registered_at":"2026-06-15T06:55:38Z","symbol":"NIM0717237","token_address":"0x4c285ea70dc5cc388a49ad7493da39ea9868183e","type":"artist","uuid":"fc2348dd-91e9-45d8-abe1-468cfb14d99d"}
album: Źródło
  type: MusicAlbum
  date published: 2009
  track: Testament
    type: MusicRecording
    duration: PT4M27S
    duration ms: 267133
    explicit: false
    by artist: Marek Piekarczyk
    in album: Źródło
      type: MusicAlbum
      date published: 2009
    isrc code: PLF391300086
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-20T11:32:38+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xec7bc190d97a60ff1afa3f183a20c40588d56cc44b03f4f05bd0ded9226e7731
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958873
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958873
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLF391300086
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-20T11:48:10Z
    additional property: OTSVerifyInstructions
      type: PropertyValue
      value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7bc190d97a60ff1afa3f183a20c40588d56cc44b03f4f05bd0ded9226e7731. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLF391300086.
      date published: 2026-07-20T11:48:10Z
    audio: Testament
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 140.02
      additional property: Musical Key
        type: PropertyValue
        value: 2
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.491
      additional property: Energy
        type: PropertyValue
        value: 0.604
      additional property: Speechiness
        type: PropertyValue
        value: 0.026
      additional property: Acousticness
        type: PropertyValue
        value: 0.121
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.002
      additional property: Liveness
        type: PropertyValue
        value: 0.392
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.244
      additional property: Loudness (dB)
        type: PropertyValue
        value: -5.63
      additional property: Key Name
        type: PropertyValue
        value: D
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Źródło
  type: MusicAlbum
  date published: 2009
album: Zrodlo
  type: MusicAlbum
  date published: 2009-10-24