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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
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  date published: 2026-06-22T02:53:59Z
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Die Zirkusprinzessin, Akt I: Ouvertüre
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duration: PT1M54S
duration ms: 114920
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by artist: Emmerich Kálmán
by artist: Großes Wiener Rundfunkorchester
by artist: Max Schönherr
by artist: Gerda Scheyrer
by artist: Hubert Paule
by artist: Josef Ebner
by artist: Felix Dombrowski
by artist: Magda Steiner
by artist: Viktor Braun
by artist: Marianne Lozal
by artist: Toni Niessner
by artist: Erich Dörner
by artist: Friedrich Haupt
by artist: Edi Brosch
in album: Kálmán: Die Zirkusprinzessin
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  date published: 2014-08-29
genre: fado
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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: 2026-07-31T12:24:41Z
audio: Die Zirkusprinzessin, Akt I: Ouvertüre
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