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  value: 1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 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. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin 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: 2011-11-15
  track: The Nutcracker, Act II: Dance of Sugar Plum Fairy
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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
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album: Classical Fusion
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album: Heart to Heart
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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: Piano Concerto No. 2 in C Minor, Op. 18: I. Moderato
track: Piano Concerto No. 2 in C Minor, Op. 18: I. Moderato (1)
track: Piano Concerto No. 2 in C Minor, Op. 18: I. Moderato (2)
track: Piano Concerto No. 2 in C Minor, Op. 18: I. Moderato (3)
track: Piano Concerto No. 2 in C Minor, Op. 18: I. Moderato (4)
track: Piano Concerto No. 2 in C Minor, Op. 18: II. Adagio sostenuto (1)
track: Piano Concerto No. 2 in C Minor, Op. 18: II. Adagio sostenuto (2)
track: Piano Concerto No. 2 in C Minor, Op. 18: II. Adagio sostenuto (3)
track: Piano Concerto No. 2 in C Minor, Op. 18: II. Adagio sostenuto (4)
track: Piano Concerto No. 2 in C Minor, Op. 18: III. Allegro scherzando (1)

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Piano Concerto No. 2 in C Minor, Op. 18: II. Adagio sostenuto
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T12:51:24Z
audio: Piano Concerto No. 2 in C Minor, Op. 18: II. Adagio sostenuto
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Piano Concerto No. 2 in C Minor, Op. 18: I. Moderato
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T16:07:24Z
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Piano Concerto No. 2 in C Minor, Op. 18: II. Adagio sostenuto
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-29T19:35:34Z
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Piano Concerto No. 2 in C Minor, Op. 18: I. Moderato (1)
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T04:47:22Z
audio: Piano Concerto No. 2 in C Minor, Op. 18: I. Moderato (1)
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Piano Concerto No. 2 in C Minor, Op. 18: I. Moderato (2)
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by artist: Ukraine National Symphony Orchestra
by artist: Vladimir Sirenko
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genre: classical
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:30:09Z
audio: Piano Concerto No. 2 in C Minor, Op. 18: I. Moderato (2)
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Piano Concerto No. 2 in C Minor, Op. 18: I. Moderato (3)
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by artist: Sergei Rachmaninoff
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by artist: Ukraine National Symphony Orchestra
by artist: Vladimir Sirenko
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genre: classical
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T16:01:17Z
audio: Piano Concerto No. 2 in C Minor, Op. 18: I. Moderato (3)
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Piano Concerto No. 2 in C Minor, Op. 18: I. Moderato (4)
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by artist: Sergei Rachmaninoff
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by artist: Ukraine National Symphony Orchestra
by artist: Vladimir Sirenko
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genre: classical
genre: classical-piano
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T02:51:48Z
audio: Piano Concerto No. 2 in C Minor, Op. 18: I. Moderato (4)
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Piano Concerto No. 2 in C Minor, Op. 18: II. Adagio sostenuto (1)
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by artist: Sergei Rachmaninoff
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by artist: Ukraine National Symphony Orchestra
by artist: Vladimir Sirenko
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genre: classical
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-30T05:43:45Z
audio: Piano Concerto No. 2 in C Minor, Op. 18: II. Adagio sostenuto (1)
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Piano Concerto No. 2 in C Minor, Op. 18: II. Adagio sostenuto (2)
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by artist: Vladimir Sirenko
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genre: classical
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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T04:14:58Z
audio: Piano Concerto No. 2 in C Minor, Op. 18: II. Adagio sostenuto (2)
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Piano Concerto No. 2 in C Minor, Op. 18: II. Adagio sostenuto (3)
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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: Piano Concerto No. 2 in C Minor, Op. 18: II. Adagio sostenuto (3)
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