Barbara Helsingius
type: MusicGroup
genre: iskelmä
genre: swedish ballads
description: Barbara Christina Elisabeth Helsingius-Koski (née Helsingius; 27 September 1937 – 9 March 2017) was a Swedish-speaking Finnish singer, poet, and Olympic fencer.Helsingius, Barbara. Biografiskt lexikon
popularity: 6
followers: 442
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album: Barbara
  type: MusicAlbum
  date published: 1966
album: Det var en gång
  type: MusicAlbum
  date published: 1977
album: Olipa kerran
  type: MusicAlbum
  date published: 1978
album: Blandade
  type: MusicAlbum
  date published: 1981
album: Reflection
  type: MusicAlbum
  date published: 1982
album: Kahlaajatyttö
  type: MusicAlbum
  date published: 1982
album: Sånt är vårt liv
  type: MusicAlbum
  date published: 1996
album: Spegling
  type: MusicAlbum
  date published: 2011-01-06
  track: Jag visste så väl
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    by artist: Barbara Helsingius
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      date published: 2011-01-06
    genre: iskelmä
    genre: swedish ballads
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-05T18:48:28Z
    audio: Jag visste så väl
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      additional property: Valence (Positivity)
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      additional property: Loudness (dB)
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        value: -10.03
      additional property: Key Name
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track: Kuparipannu

Kuparipannu
type: MusicRecording
duration: PT3M1S
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explicit: false
by artist: Barbara Helsingius
in album: Onnenetsijä
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  date published: 2013-10-18
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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: 2026-07-02T11:38:34Z
audio: Kuparipannu
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