Guro Kleven Hagen
type: MusicGroup
description: Guro Kleven Hagen (born 11 May 1994) is a Norwegian violinist raised in Fagernes. She is the first concertmaster at the Norwegian National Opera and Ballet orchestra as of January 2018. Biography I
popularity: 6
followers: 208
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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: 2026-06-20T19:15:05Z
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album: Guro Kleven Hagen – Bruch 1st and Prokofiev 2nd Violin Concertos
  type: MusicAlbum
  date published: 2014-05-23
album: Guro Kleven Hagen – Bruch 1st and Prokofiev 2nd Violin Concertos
  type: MusicAlbum
  date published: 2014-05-23
album: Fait Pleurer Les Songes – Ravel · Poulenc · Prokofiev Violin Sonatas
  type: MusicAlbum
  date published: 2017-05-05