Prelude in E Major
type: MusicRecording
duration: PT1M50S
duration ms: 110000
explicit: false
by artist: Francisco Tárrega
by artist: Mats Bergström
in album: Classical Guitar for Baby
  type: MusicAlbum
  date published: 2011-08-30
genre: spanish-classical
genre: late-romantic-era
isrc code: HKI190931805
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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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 → block OTSBitcoinBlock must exist at that height 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36ec20c29a6782fd2c1214a95c68744a6c99ade4228a290b484f975f0f93e0c0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190931805.
  date published: 2026-07-08T03:20:19Z
audio: Prelude in E Major
  type: AudioObject
  additional property: Tempo (BPM)
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  additional property: Musical Key
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    value: 4
  additional property: Mode (Major/Minor)
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    value: 1
  additional property: Time Signature
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    value: 5
  additional property: Danceability
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  additional property: Energy
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  additional property: Speechiness
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    value: 0.052
  additional property: Acousticness
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  additional property: Instrumentalness
    type: PropertyValue
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  additional property: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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    value: -28.038
  additional property: Key Name
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    value: E
  additional property: Mode Name
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    value: Major