Ellemis Piano Quartet
type: MusicGroup
genre: tango
popularity: 2
followers: 24
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additional property: OTSVerifyInstructions
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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
subject of: OpenTimestamps Proof of Existence
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  date published: 2026-06-17T15:44:10Z
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album: Works by Johannes Brahms, Ernest Chausson
  type: MusicAlbum
  date published: 2008-01-01
album: Eikones
  type: MusicAlbum
  date published: 2010-01-01
  track: El Tango de Roxanne
    type: MusicRecording
    duration: PT4M33S
    duration ms: 273546
    explicit: false
    by artist: Ellemis Piano Quartet
    in album: Eikones
      type: MusicAlbum
      date published: 2010-01-01
    genre: tango
    isrc code: USHM81628176
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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
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
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      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c33c2614f6844ca07f08ecc0d5a13f46fb595413cf7c2e051663a3cbbad2dc1. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-20T01:35:06Z), 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/USHM81628176.
      date published: 2026-07-20T01:35:06Z
    audio: El Tango de Roxanne
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 116.627
      additional property: Musical Key
        type: PropertyValue
        value: 7
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.341
      additional property: Energy
        type: PropertyValue
        value: 0.472
      additional property: Speechiness
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        value: 0.04
      additional property: Acousticness
        type: PropertyValue
        value: 0.882
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.679
      additional property: Liveness
        type: PropertyValue
        value: 0.13
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.391
      additional property: Loudness (dB)
        type: PropertyValue
        value: -8.296
      additional property: Key Name
        type: PropertyValue
        value: G
      additional property: Mode Name
        type: PropertyValue
        value: Minor