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subject of: OpenTimestamps Proof of Existence
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track: Concerto in C Major for Sopranino Recorder, Strings and B.C, RV 443: II. Largo

Concerto in C Major for Sopranino Recorder, Strings and B.C, RV 443: II. Largo
type: MusicRecording
duration: PT3M55S
duration ms: 235573
explicit: false
by artist: Antonio Vivaldi
by artist: Hans Stadlmeier
by artist: Karl Stangenberg
by artist: Munich Chamber Orchestra
in album: The 50 Darkest Pieces of Classical Music
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  date published: 2020-10-30
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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
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T11:38:34Z
audio: Concerto in C Major for Sopranino Recorder, Strings and B.C, RV 443: II. Largo
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  additional property: Key Name
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