Ludmila Jakubczak
type: MusicGroup
popularity: 9
followers: 516
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xb30f9b6ef9f32c2a4a437c80f56767f098147e690cb4fddcbe804427cad89294
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954066
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954066
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/797c60d5-2762-45e6-8d39-a8aa02673b2f.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/797c60d5-2762-45e6-8d39-a8aa02673b2f.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/797c60d5-2762-45e6-8d39-a8aa02673b2f
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xb30f9b6ef9f32c2a4a437c80f56767f098147e690cb4fddcbe804427cad89294","name":"Ludmila Jakubczak","registered_at":"2026-06-17T08:00:11Z","symbol":"NIM1331616","token_address":"0xb972dbb77b79670d834524d8439930ffa0af71bd","type":"artist","uuid":"797c60d5-2762-45e6-8d39-a8aa02673b2f"}
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 0xb30f9b6ef9f32c2a4a437c80f56767f098147e690cb4fddcbe804427cad89294. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/797c60d5-2762-45e6-8d39-a8aa02673b2f.json and https://artists.proofprofile.net/proofs/artist/797c60d5-2762-45e6-8d39-a8aa02673b2f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0xb30f9b6ef9f32c2a4a437c80f56767f098147e690cb4fddcbe804427cad89294","name":"Ludmila Jakubczak","registered_at":"2026-06-17T08:00:11Z","symbol":"NIM1331616","token_address":"0xb972dbb77b79670d834524d8439930ffa0af71bd","type":"artist","uuid":"797c60d5-2762-45e6-8d39-a8aa02673b2f"}
album: Złota Kolekcja
  type: MusicAlbum
  date published: 2017-04-21
  track: Gdy mi ciebie zabraknie
    type: MusicRecording
    duration: PT3M9S
    duration ms: 189800
    explicit: false
    by artist: Ludmila Jakubczak
    in album: Złota Kolekcja
      type: MusicAlbum
      date published: 2017-04-21
    isrc code: PLA246107878
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-06-26T00:45:10+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x030f6b5a47e65715599268695e8f4a8c77cfd3c9a513d200d5a5b241c07aa981
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956500
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956500
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA246107878
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-03T13:55:21Z
    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 0x030f6b5a47e65715599268695e8f4a8c77cfd3c9a513d200d5a5b241c07aa981. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/PLA246107878.
      date published: 2026-07-03T13:55:21Z
    audio: Gdy mi ciebie zabraknie
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 111.521
      additional property: Musical Key
        type: PropertyValue
        value: 2
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.481
      additional property: Energy
        type: PropertyValue
        value: 0.435
      additional property: Speechiness
        type: PropertyValue
        value: 0.033
      additional property: Acousticness
        type: PropertyValue
        value: 0.696
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.287
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.613
      additional property: Loudness (dB)
        type: PropertyValue
        value: -7.731
      additional property: Key Name
        type: PropertyValue
        value: D
      additional property: Mode Name
        type: PropertyValue
        value: Minor
track: Gdy mi ciebie zabraknie
  type: MusicRecording
  duration: PT3M8S
  duration ms: 188146
  explicit: false
  by artist: Ludmila Jakubczak
  in album: 60 lat Polskich Nagrań
    type: MusicAlbum
    date published: 2016-10-03
  isrc code: PLA246107878
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-06-26T00:45:10+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x030f6b5a47e65715599268695e8f4a8c77cfd3c9a513d200d5a5b241c07aa981
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 956304
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/956304
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLA246107878
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-02T03:55:08Z
  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 0x030f6b5a47e65715599268695e8f4a8c77cfd3c9a513d200d5a5b241c07aa981. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/PLA246107878.
    date published: 2026-07-02T03:55:08Z
  audio: Gdy mi ciebie zabraknie
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 126.246
    additional property: Musical Key
      type: PropertyValue
      value: 5
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.432
    additional property: Energy
      type: PropertyValue
      value: 0.542
    additional property: Speechiness
      type: PropertyValue
      value: 0.036
    additional property: Acousticness
      type: PropertyValue
      value: 0.669
    additional property: Instrumentalness
      type: PropertyValue
      value: 0
    additional property: Liveness
      type: PropertyValue
      value: 0.397
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.569
    additional property: Loudness (dB)
    additional property: Key Name
    additional property: Mode Name

Loudness (dB)
type: PropertyValue
value: -10.361

Key Name
type: PropertyValue
value: F

Mode Name
type: PropertyValue
value: Major