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description: thumbnail|250px|Steinberg with Tiger Woods in 2014. Mark Steinberg is a sports agent who has been representing top golfers since 1992. He is a partner at Excel Sports Management. where he heads the pr
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-07T18:39:05Z
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-08T03:20:19Z
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  track: Sonata for Piano and Violin in A, K.526: 1. Allegro molto
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album: Cowell: Homage To Iran / Piano Pieces / Set of Five / Six Casual Developments / Two Songs
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album: Nancarrow: Pieces for Small Orchestra / Tango? / String Quartet No. 1
album: Mozart: The Singles - 66 Classic Tracks
album: Sierra: New Music With A Caribbean Accent
album: Wuorinen: Ashberyana / Fenton Songs I and Ii / Josquiniana
album: 54 Minutes from Viñao
album: Kirchner: Duo for Violin and Piano / Piano Trio / Piano Sonata / Triptych
album: Dawe: A Noise did Rise
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T03:15:04Z
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
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subject of: OpenTimestamps Proof of Existence
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in album: Mozart: Sonatas for Piano & Violin
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  date published: 2010-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T21:35:24Z
audio: Sonata for Piano and Violin in E minor, K.304: 1. Allegro
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Sonata for Piano and Violin in E minor, K.304: 2. Tempo di minuetto
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by artist: Wolfgang Amadeus Mozart
by artist: Mitsuko Uchida
by artist: Mark Steinberg
in album: Mozart: Sonatas for Piano & Violin
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  date published: 2010-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-08T03:20:19Z
audio: Sonata for Piano and Violin in E minor, K.304: 2. Tempo di minuetto
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Sonata for Piano and Violin in A, K.526: 1. Allegro molto
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duration: PT6M53S
duration ms: 413706
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by artist: Wolfgang Amadeus Mozart
by artist: Mitsuko Uchida
by artist: Mark Steinberg
in album: Mozart: Sonatas for Piano & Violin
  type: MusicAlbum
  date published: 2010-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T17:29:52Z
audio: Sonata for Piano and Violin in A, K.526: 1. Allegro molto
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Sonata for Piano and Violin in A, K.526: 2. Andante
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duration ms: 653253
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by artist: Wolfgang Amadeus Mozart
by artist: Mitsuko Uchida
by artist: Mark Steinberg
in album: Mozart: Sonatas for Piano & Violin
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  date published: 2010-01-01
genre: classical
genre: classical-era
genre: classical-piano
genre: opera
genre: chamber-music
genre: concerto
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additional property: CopyrightID
additional property: CopyrightStatus
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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 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
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  date published: 2026-07-22T17:48:40Z
audio: Sonata for Piano and Violin in A, K.526: 2. Andante
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Schumann: A Schumann Salon Concert Performed on Period Instruments
type: MusicAlbum
date published: 2009-05-19

Mozart 225: Complete Duos
type: MusicAlbum
date published: 2017-01-01
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  additional property: OTSVerifyInstructions
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-29T15:38:18Z
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    additional property: Valence (Positivity)
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Cowell: Homage To Iran / Piano Pieces / Set of Five / Six Casual Developments / Two Songs
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date published: 2005-02-01
track: Homage to Iran: I. Andante rubato
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  by artist: Mark Steinberg
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  by artist: Cheryl Seltzer
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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 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
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    date published: 2026-07-08T03:20:19Z
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track: The Banshee
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  additional property: OTSVerifyInstructions
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  subject of: OpenTimestamps Proof of Existence
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