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subject of: OpenTimestamps Proof of Existence
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album: ... du silence au silence
  type: MusicAlbum
  date published: 2022-10-07
track: Piano Concerto No. 13 in C Major, K. 415/387b: Allegro

Piano Concerto No. 13 in C Major, K. 415/387b: Allegro
type: MusicRecording
duration: PT10M44S
duration ms: 644506
explicit: false
by artist: Wolfgang Amadeus Mozart
by artist: La Petite Bande
by artist: Marleen Thiers
by artist: Sara Kuijken
by artist: Sigiswald Kuijken
by artist: Veronica Kuijken
in album: Mozart: Piano Concertos K. 413, K. 414 & K. 415
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  date published: 2017-02-10
genre: classical
genre: classical-era
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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
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  date published: 2026-07-08T03:22:41Z
audio: Piano Concerto No. 13 in C Major, K. 415/387b: Allegro
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  additional property: Key Name
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