Nikolai Tokarev
type: MusicGroup
genre: classical piano
popularity: 15
followers: 438
additional property: CopyrightID
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additional property: OTSVerificationAPI
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additional property: OTSVerifyInstructions
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  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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9cfddd195aa41a015a6e18595102947e374941c2deabae899d360664627ceed. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f2e1554c-ba36-407a-950d-637fd764113b.json and https://artists.proofprofile.net/proofs/artist/f2e1554c-ba36-407a-950d-637fd764113b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T19:59:56Z
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album: Variations (Edition Ruhr Piano Festival, Vol. 14)
  type: MusicAlbum
  date published: 2006
album: Variationen (Vartiations)
  type: MusicAlbum
  date published: 2007-01-19
album: No. 1
  type: MusicAlbum
  date published: 2007-04-13
  track: Prelude for Piano in B Minor, BWV 855a
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    duration ms: 136626
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    by artist: Nikolai Tokarev
    in album: No. 1
      type: MusicAlbum
      date published: 2007-04-13
    genre: classical piano
    isrc code: DEE860700133
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    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
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      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b649d6eaf21d1d99f0b34b2d8d455dae8c77e7f093d089bd75f12a232c836d7. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/DEE860700133.
      date published: 2026-07-16T09:16:54Z
    audio: Prelude for Piano in B Minor, BWV 855a
      type: AudioObject
      additional property: Tempo (BPM)
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        value: 92.14
      additional property: Musical Key
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        value: 11
      additional property: Mode (Major/Minor)
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        value: 0
      additional property: Time Signature
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      additional property: Danceability
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      additional property: Energy
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      additional property: Acousticness
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      additional property: Instrumentalness
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      additional property: Liveness
        type: PropertyValue
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      additional property: Valence (Positivity)
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        value: 0.176
      additional property: Loudness (dB)
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        value: -37.018
      additional property: Key Name
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        value: B
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album: French Album
  type: MusicAlbum
  date published: 2008-09-05
album: French Album
  type: MusicAlbum
  date published: 2009-04-10
album: Romantische Klavierkonzerte (Grieg, Chopin Nr. 2)
  type: MusicAlbum
  date published: 2009-08-17
album: Black Swan Fantasy
  type: MusicAlbum
  date published: 2012-02-20
album: Homage to Horowitz
  type: MusicAlbum
  date published: 2014-02-17
  track: Sonata in F Minor, Kk. 19 (L. 383): Allegro
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    duration: PT4M35S
    duration ms: 275426
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    by artist: Nikolai Tokarev
    in album: Homage to Horowitz
      type: MusicAlbum
      date published: 2014-02-17
    genre: classical piano
    isrc code: DEE861300934
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    additional property: OTSVerificationAPI
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    additional property: OTSTimestamp
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    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
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      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35920a3ff0227576c95b7fe675c8ebffcc3b34e31486265515092839342d0a3b. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/DEE861300934.
      date published: 2026-07-18T12:14:37Z
    audio: Sonata in F Minor, Kk. 19 (L. 383): Allegro
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      additional property: Tempo (BPM)
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      additional property: Liveness
      additional property: Valence (Positivity)
      additional property: Loudness (dB)
      additional property: Key Name
      additional property: Mode Name

Danceability
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value: 0.208

Energy
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value: 0.029

Speechiness
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value: 0.039

Acousticness
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value: 0.995

Instrumentalness
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value: 0.919

Liveness
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value: 0.148

Valence (Positivity)
type: PropertyValue
value: 0.37

Loudness (dB)
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value: -35.826

Key Name
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value: F

Mode Name
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value: Minor