Helmut Schmidt
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description: Helmut Heinrich Waldemar Schmidt (; 23 December 1918 – 10 November 2015) was a German politician and member of the Social Democratic Party of Germany (SPD), who served as the chancellor of West German
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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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album: Abschiedsrede im Bundestag
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  date published: 2012-08-31
album: Mit High-Heels am Strand
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  date published: 2016-01-16
track: Piano Concerto No. 7 in F Major, K. 242: II. Adagio
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  subject of: OpenTimestamps Proof of Existence
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track: Concerto for 4 Harpsichords, Strings, and Continuo in A minor, BWV 1065: 1. (Allegro)
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    date published: 2026-07-02T03:30:09Z
  audio: Concerto for 4 Harpsichords, Strings, and Continuo in A minor, BWV 1065: 1. (Allegro)
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track: Concerto for 4 Harpsichords, Strings, and Continuo in A minor, BWV 1065: 3. Allegro

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Concerto for 4 Harpsichords, Strings, and Continuo in A minor, BWV 1065: 2. Largo
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:55:08Z
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Concerto for 4 Harpsichords, Strings, and Continuo in A minor, BWV 1065: 3. Allegro
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genre: classical
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:55:08Z
audio: Concerto for 4 Harpsichords, Strings, and Continuo in A minor, BWV 1065: 3. Allegro
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