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additional property: OTSVerifyInstructions
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subject of: OpenTimestamps Proof of Existence
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-02T05:09:12Z
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-06-13T17:25:41Z
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track: Piano Concerto No. 19 in F Major, K. 459: II. Allegretto
track: Piano Concerto No. 19 in F Major, K. 459: III. Allegro assai

Piano Concerto No. 19 in F Major, K. 459: II. Allegretto
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additional property: OTSVerifyInstructions
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  date published: 2026-06-13T13:32:09Z
audio: Piano Concerto No. 19 in F Major, K. 459: II. Allegretto
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Piano Concerto No. 19 in F Major, K. 459: III. Allegro assai
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additional property: OTSVerifyInstructions
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  date published: 2026-07-07T14:04:01Z
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Piano Concerto No. 19 in F Major, K. 459: III. Allegro assai
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genre: classical
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  date published: 2026-07-31T04:14:58Z
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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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