Oslo Quartet
type: MusicGroup
genre: chamber music
popularity: 4
followers: 52
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additional property: OTSBitcoinBlockVerifyURL
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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 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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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde45f1d0fa853e3be6dcd57f1ea1a9209beb9ea526ec736ec77341e8008c9f60. Chain 2 (Bitcoin): anchored in block 953970 (2026-06-16T16:09:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/299acf9f-171e-4c05-90b9-bd72df2c0103.json and https://artists.proofprofile.net/proofs/artist/299acf9f-171e-4c05-90b9-bd72df2c0103.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T16:09:39Z
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album: Grieg: String Quartets Nos. 1 and 2 / Johansen: String Quartet Op. 35
  type: MusicAlbum
  date published: 1994-05-19
album: Grieg: String Quartets Nos. 1 and 2 / Johansen: String Quartet Op. 35
  type: MusicAlbum
  date published: 1994-05-19
album: Grieg: String Quartets Nos. 1 and 2 / Johansen: String Quartet Op. 35
  type: MusicAlbum
  date published: 1994-05-19
album: Norwegian 20th Century String Quartets
  type: MusicAlbum
  date published: 2000-01-11
album: Norwegian 20th Century String Quartets
  type: MusicAlbum
  date published: 2000-01-11
album: Norwegian 20th Century String Quartets
  type: MusicAlbum
  date published: 2000-01-11
album: Sibelius: String Quartet, "Voces Intimae" / Wolf: Italian Serenade / Berg: Lyric Suite
  type: MusicAlbum
  date published: 2002-01-01
album: Sibelius: String Quartet, "Voces Intimae" / Wolf: Italian Serenade / Berg: Lyric Suite
  type: MusicAlbum
  date published: 2002-01-01
track: String Quartet No. 1 in G Minor, Op. 27: II. Romanze: Andantino - Allegro agitato
  type: MusicRecording
  duration: PT7M12S
  duration ms: 432213
  explicit: false
  by artist: Edvard Grieg
  by artist: Oslo Quartet
  in album: Grieg (The Very Best Of)
    type: MusicAlbum
    date published: 2006-04-18
  genre: classical
  genre: late-romantic-era
  genre: norwegian-classical
  isrc code: HKI199245602
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  additional property: OTSVerificationAPI
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    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199245602
  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 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
    type: DigitalDocument
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    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdab704e7c4d64aa9d62b6429cb5c0e52ae4283269660b59b171be5df743ec70. 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/HKI199245602.
    date published: 2026-07-08T03:20:19Z
  audio: String Quartet No. 1 in G Minor, Op. 27: II. Romanze: Andantino - Allegro agitato
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 143.102
    additional property: Musical Key
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      value: 5
    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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      value: 0.059
    additional property: Speechiness
      type: PropertyValue
      value: 0.048
    additional property: Acousticness
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      value: 0.974
    additional property: Instrumentalness
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      value: 0.25
    additional property: Liveness
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      value: 0.15
    additional property: Valence (Positivity)
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      value: 0.051
    additional property: Loudness (dB)
      type: PropertyValue
      value: -28.14
    additional property: Key Name
      type: PropertyValue
      value: F
    additional property: Mode Name
      type: PropertyValue
      value: Major