Vlach Quartet Prague
type: MusicGroup
genre: chamber music
genre: classical
popularity: 23
followers: 391
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-06-12T19:24:56Z
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album: Clarinet Quintets on Jewish Themes
  type: MusicAlbum
  date published: 1999-10-26
album: Clarinet Quintets on Jewish Themes
  type: MusicAlbum
  date published: 1999-10-26
track: Drobnosti (Miniatures), Op. 75a, B. 149: I. Cavatina: Moderato
  type: MusicRecording
  duration: PT3M16S
  duration ms: 196666
  explicit: false
  by artist: Antonín Dvořák
  by artist: Vlach Quartet Prague
  in album: Fånga dagen
    type: MusicAlbum
    date published: 2011-03-15
  genre: classical
  genre: late-romantic-era
  genre: czech-classical
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  additional property: OTSTimestamp
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  additional property: OTSVerifyInstructions
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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 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
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    date published: 2026-06-13T12:47:07Z
  audio: Drobnosti (Miniatures), Op. 75a, B. 149: I. Cavatina: Moderato
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