Lev Polyakin
type: MusicGroup
genre: chamber music
popularity: 11
followers: 170
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x0cdddd215fe72ab86e0023da5328f4eff85afdb2fb6fc014d7e61d91aa9d1401
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953727
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953727
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/8fb7919e-c163-4379-b1f7-bebac6761011.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/8fb7919e-c163-4379-b1f7-bebac6761011.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/8fb7919e-c163-4379-b1f7-bebac6761011
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T02:33:01Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x0cdddd215fe72ab86e0023da5328f4eff85afdb2fb6fc014d7e61d91aa9d1401","name":"Lev Polyakin","registered_at":"2026-06-14T19:29:48Z","symbol":"NIM0553518","token_address":"0xa1cc3c9c0f4e9a1eef0ba125f7d6800df3a5415c","type":"artist","uuid":"8fb7919e-c163-4379-b1f7-bebac6761011"}
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 0x0cdddd215fe72ab86e0023da5328f4eff85afdb2fb6fc014d7e61d91aa9d1401. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8fb7919e-c163-4379-b1f7-bebac6761011.json and https://artists.proofprofile.net/proofs/artist/8fb7919e-c163-4379-b1f7-bebac6761011.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T02:33:01Z
  text: {"copyright_id":"0x0cdddd215fe72ab86e0023da5328f4eff85afdb2fb6fc014d7e61d91aa9d1401","name":"Lev Polyakin","registered_at":"2026-06-14T19:29:48Z","symbol":"NIM0553518","token_address":"0xa1cc3c9c0f4e9a1eef0ba125f7d6800df3a5415c","type":"artist","uuid":"8fb7919e-c163-4379-b1f7-bebac6761011"}
album: The Other Side of the Road
  type: MusicAlbum
  date published: 2002-01-01
album: Christmas Kaleidoscope
  type: MusicAlbum
  date published: 2004-01-01
album: Last Silence
  type: MusicAlbum
  date published: 2021-02-05
  track: 5 Petits duos, Op. 56: No. 2, Berceuse
    type: MusicRecording
    duration: PT1M53S
    duration ms: 113341
    explicit: false
    by artist: Lev Polyakin
    in album: Last Silence
      type: MusicAlbum
      date published: 2021-02-05
    genre: chamber music
    isrc code: USSF61800198
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-15T10:14:51+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x751c670fa1c8aa6a950d5265093679b1fc9598a091abb6b259f9fa7b49353abd
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958146
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958146
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSF61800198
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-15T10:33:22Z
    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 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 0x751c670fa1c8aa6a950d5265093679b1fc9598a091abb6b259f9fa7b49353abd. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/USSF61800198.
      date published: 2026-07-15T10:33:22Z
    audio: 5 Petits duos, Op. 56: No. 2, Berceuse
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 85.658
      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: 0.132
      additional property: Energy
        type: PropertyValue
        value: 0.016
      additional property: Speechiness
        type: PropertyValue
        value: 0.047
      additional property: Acousticness
        type: PropertyValue
        value: 0.993
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.144
      additional property: Liveness
        type: PropertyValue
        value: 0.076
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.19
      additional property: Loudness (dB)
        type: PropertyValue
        value: -30.548
      additional property: Key Name
        type: PropertyValue
        value: D
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Last Silence
  type: MusicAlbum
  date published: 2021-02-05
track: Café Music: I. Allegro
  type: MusicRecording
  duration: PT5M50S
  duration ms: 350666
  explicit: false
  by artist: Paul Schoenfield
  by artist: Lev Polyakin
  by artist: Charles Bernard
  by artist: Frances Renzi
  in album: Schoenfield: Cafe Music
    type: MusicAlbum
    date published: 2010-06-08
  popularity: 1
  isrc code: US29K0654401
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x6db51ba01aaec76660aee12661ea6aeaef8da40401dea5605ae0c9cebded879e
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 960334
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/960334
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US29K0654401
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-31T02:19:15Z
  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 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 0x6db51ba01aaec76660aee12661ea6aeaef8da40401dea5605ae0c9cebded879e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/US29K0654401.
    date published: 2026-07-31T02:19:15Z
  audio: Café Music: I. Allegro
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 124.572
    additional property: Musical Key
      type: PropertyValue
      value: 3
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.39
    additional property: Energy
      type: PropertyValue
      value: 0.223
    additional property: Speechiness
      type: PropertyValue
      value: 0.035
    additional property: Acousticness
    additional property: Instrumentalness
    additional property: Liveness
    additional property: Valence (Positivity)
    additional property: Loudness (dB)
    additional property: Key Name
    additional property: Mode Name
track: Café Music: II. Rubato, andante moderato
track: Café Music: III. Presto

Acousticness
type: PropertyValue
value: 0.975

Instrumentalness
type: PropertyValue
value: 0.831

Liveness
type: PropertyValue
value: 0.254

Valence (Positivity)
type: PropertyValue
value: 0.281

Loudness (dB)
type: PropertyValue
value: -22.743

Key Name
type: PropertyValue
value: Eb

Mode Name
type: PropertyValue
value: Major

Café Music: II. Rubato, andante moderato
type: MusicRecording
duration: PT5M29S
duration ms: 329160
explicit: false
by artist: Paul Schoenfield
by artist: Lev Polyakin
by artist: Charles Bernard
by artist: Frances Renzi
in album: Schoenfield: Cafe Music
  type: MusicAlbum
  date published: 2010-06-08
popularity: 1
isrc code: US29K0654402
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-05T06:48:01+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xc0deb97169434c75344eea9622978afe17e0f1bf8f47e88c44eb17179d2682b2
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 957120
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957120
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US29K0654402
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:22:41Z
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 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 0xc0deb97169434c75344eea9622978afe17e0f1bf8f47e88c44eb17179d2682b2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/US29K0654402.
  date published: 2026-07-08T03:22:41Z
audio: Café Music: II. Rubato, andante moderato
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 105.083
  additional property: Musical Key
    type: PropertyValue
    value: 4
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.106
  additional property: Energy
    type: PropertyValue
    value: 0.038
  additional property: Speechiness
    type: PropertyValue
    value: 0.039
  additional property: Acousticness
    type: PropertyValue
    value: 0.973
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.64
  additional property: Liveness
    type: PropertyValue
    value: 0.098
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.039
  additional property: Loudness (dB)
    type: PropertyValue
    value: -31.12
  additional property: Key Name
    type: PropertyValue
    value: E
  additional property: Mode Name
    type: PropertyValue
    value: Major

Café Music: III. Presto
type: MusicRecording
duration: PT4M36S
duration ms: 276000
explicit: false
by artist: Paul Schoenfield
by artist: Lev Polyakin
by artist: Charles Bernard
by artist: Frances Renzi
in album: Schoenfield: Cafe Music
  type: MusicAlbum
  date published: 2010-06-08
popularity: 1
isrc code: US29K0654403
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x814972339f9e812d23786030fdd2856de1340795fb3cd8d7c57a5f41ee163c51
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960397
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960397
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US29K0654403
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T12:24:41Z
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 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 0x814972339f9e812d23786030fdd2856de1340795fb3cd8d7c57a5f41ee163c51. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/US29K0654403.
  date published: 2026-07-31T12:24:41Z
audio: Café Music: III. Presto
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 152.881
  additional property: Musical Key
    type: PropertyValue
    value: 0
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.348
  additional property: Energy
    type: PropertyValue
    value: 0.313
  additional property: Speechiness
    type: PropertyValue
    value: 0.033
  additional property: Acousticness
    type: PropertyValue
    value: 0.976
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.867
  additional property: Liveness
    type: PropertyValue
    value: 0.093
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.435
  additional property: Loudness (dB)
    type: PropertyValue
    value: -21.32
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Minor