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track: Le Nozze di Figaro, K. 492: Overture
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  by artist: Wolfgang Amadeus Mozart
  by artist: Sir Colin Davis/BBC Symphony Orchestra/Royal Philharmonic Orchestra/Jessye Norman
  by artist: BBC Symphony Orchestra
  by artist: Royal Philharmonic Orchestra
  by artist: Sir Colin Davis
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    date published: 2019-04-12
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  genre: classical-era
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  genre: chamber-music
  genre: concerto
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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
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    date published: 2026-07-02T03:55:08Z
  audio: Le Nozze di Figaro, K. 492: Overture
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