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description: Josef Casimir Hofmann (originally Józef Kazimierz Hofmann; January 20, 1876February 16, 1957) was a Polish-American pianist, composer, music teacher, and inventor. Childhood Josef Hofmann was born in
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Spanish Romance, Op. 74 - The Smuggler (Arr. For Solo Piano by Carl Tausig) - Duo-Art 7072
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Ballade No. 4 in F Minor, Op. 52
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subject of: OpenTimestamps Proof of Existence
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Piano Sonata No. 14, Op. 27 No. 2 Quasi Una Fantasia: II. Allegretto - Duo-Art 6102
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Caprice Espagnol, Op. 37 - Duo-Art 6953
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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 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 0x5ce4e62904311a6551052fca3d824d86120bcfafa38a3272230a1e16988f49d9. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82304753 — a six-check JSON result.
  date published: 2026-07-31T10:20:10Z
audio: Caprice Espagnol, Op. 37 - Duo-Art 6953
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 120.068
  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: 0.348
  additional property: Energy
    type: PropertyValue
    value: 0.189
  additional property: Speechiness
    type: PropertyValue
    value: 0.034
  additional property: Acousticness
    type: PropertyValue
    value: 0.991
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.885
  additional property: Liveness
    type: PropertyValue
    value: 0.1
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.171
  additional property: Loudness (dB)
    type: PropertyValue
    value: -20.243
  additional property: Key Name
    type: PropertyValue
    value: F
  additional property: Mode Name
    type: PropertyValue
    value: Major