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subject of: OpenTimestamps Proof of Existence
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album: Klarinetsonate Opus 120, No.1
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  date published: 1997-10-01
album: Mendelssohn, The Master Works Part: 36
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album: Dämmerung
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track: Lieder ohne Worte, Op. 67: IV. Spinnerlied in A Major. Presto
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    date published: 2014-06-13
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  genre: early-romantic-era
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  genre: classical-piano
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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: 2026-07-30T15:42:38Z
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track: Lied ohne Worte in E Major, Op. 19 No. 1
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  genre: early-romantic-era
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-31T08:26:41Z
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Andante Con Moto, In E Major Op. 19 No. 1: Andante Con Moto
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by artist: Frank Van De Laar
by artist: Arts Music Recording, Rotterdam
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genre: classical
genre: early-romantic-era
genre: german-romanticism
genre: classical-piano
genre: choral
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T19:53:13Z
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