Oscar Levertin
type: MusicGroup
description: thumb|Oscar Levertin. thumb|Oscar Levertin painted by Carl Larsson 1906 Oscar Ivar Levertin (17 July 1862, Norrköping – 22 September 1906) was a Swedish poet, critic and literary historian. Levertin w
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followers: 3
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-06-17T08:11:48Z
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track: Kejsar Karls visa

Kejsar Karls visa
type: MusicRecording
duration: PT4M9S
duration ms: 249826
explicit: false
by artist: Wilhelm Stenhammar
by artist: Oscar Levertin
by artist: Håkan Hagegård
by artist: Thomas Schuback
in album: Sånger
  type: MusicAlbum
  date published: 1989-01-01
genre: early-modern-classical
genre: post-romantic-era
genre: swedish-classical
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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 → 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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  date published: 2026-06-13T12:47:07Z
audio: Kejsar Karls visa
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