Novus Quartet
type: MusicGroup
genre: chamber music
popularity: 14
followers: 550
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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
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album: Tchaikovsky: String Quartet & Souvenir de Florence
  type: MusicAlbum
  date published: 2015
  track: String Quartet No. 1 in D Major, Op. 11: II. Andante cantabile (Arr. for Cello and Piano)
  track: String Sextet in D Minor, Op. 70 "Souvenir de Florence": II. Adagio cantabile e con moto

String Quartet No. 1 in D Major, Op. 11: II. Andante cantabile (Arr. for Cello and Piano)
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duration: PT7M24S
duration ms: 444973
explicit: false
by artist: Pyotr Ilyich Tchaikovsky
by artist: Novus Quartet
in album: Tchaikovsky: String Quartet & Souvenir de Florence
  type: MusicAlbum
  date published: 2015
popularity: 3
isrc code: FROV61615402
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
  type: PropertyValue
  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: 2026-07-08T03:20:19Z
audio: String Quartet No. 1 in D Major, Op. 11: II. Andante cantabile (Arr. for Cello and Piano)
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String Sextet in D Minor, Op. 70 "Souvenir de Florence": II. Adagio cantabile e con moto
type: MusicRecording
duration: PT10M28S
duration ms: 628560
explicit: false
by artist: Pyotr Ilyich Tchaikovsky
by artist: Novus Quartet
by artist: Ophélie Gaillard
by artist: Lise Berthaud
in album: Tchaikovsky: String Quartet & Souvenir de Florence
  type: MusicAlbum
  date published: 2015
popularity: 1
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-31T17:29:52Z
audio: String Sextet in D Minor, Op. 70 "Souvenir de Florence": II. Adagio cantabile e con moto
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additional property: OTSVerifyInstructions
  type: PropertyValue
  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