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genre: classical
genre: classical piano
description: Leon Fleisher (July 23, 1928 – August 2, 2020) was an American classical pianist, conductor and pedagogue. He was one of the most renowned pianists and pedagogues in the world. Music correspondent Eli
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album: Leon Fleisher Live, Vol. 3
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album: Brahms: String Quartets & Piano Quintet
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  track: String Quartet No. 3 in B-Flat Major, Op. 67: II. Andante
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String Quartet No. 1 in C Minor, Op. 51 No. 1: III. Allegretto molto moderato e comodo – Un poco più animato - Recorded 2007
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String Quartet No. 2 in A Minor, Op. 51 No. 2: I. Allegro non troppo
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String Quartet No. 2 in A Minor, Op. 51 No. 2: IV. Finale. Allegro non assai – Più vivace
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  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 0x8c9119cd61c5c23b02a49c2117db927384a4705bcba291a1b8d751a1aef0acea. 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/DEN960500794.
  date published: 2026-07-08T03:22:41Z
audio: String Quartet No. 2 in A Minor, Op. 51 No. 2: IV. Finale. Allegro non assai – Più vivace
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 105.949
  additional property: Musical Key
    type: PropertyValue
    value: 9
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.341
  additional property: Energy
    type: PropertyValue
    value: 0.107
  additional property: Speechiness
    type: PropertyValue
    value: 0.051
  additional property: Acousticness
    type: PropertyValue
    value: 0.9
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.559
  additional property: Liveness
    type: PropertyValue
    value: 0.044
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.245
  additional property: Loudness (dB)
    type: PropertyValue
    value: -20.906
  additional property: Key Name
    type: PropertyValue
    value: A
  additional property: Mode Name
    type: PropertyValue
    value: Minor