Fredrik Ljungkvist
type: MusicGroup
genre: free jazz
description: thumb|right|250px|Fredrik Ljungkvist in Aarhus, Denmark (2011) Håkan Fredrik Ljungkvist (born 29 November 1969 in Kristinehamn, Sweden), is a Swedish jazz musician (saxophone and clarinet), the son o
popularity: 13
followers: 418
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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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  date published: 2026-06-14T15:20:52Z
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album: Yun Kan 12345
  type: MusicAlbum
  date published: 2004-01-01
  track: Abraxas
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    by artist: Fredrik Ljungkvist
    in album: Yun Kan 12345
      type: MusicAlbum
      date published: 2004-01-01
    genre: free jazz
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    additional property: OTSVerifyInstructions
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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 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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      date published: 2026-07-17T06:09:33Z
    audio: Abraxas
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album: Yun Kan 12345
  type: MusicAlbum
  date published: 2004-01-01
  track: Abraxas
    type: MusicRecording
    duration: PT6M50S
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    by artist: Fredrik Ljungkvist
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      type: MusicAlbum
      date published: 2004-01-01
    genre: free jazz
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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 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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      date published: 2026-07-20T05:03:26Z
    audio: Abraxas
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album: Badaling
album: Past in Present
album: And Now the Queen
album: Trädet EP Version
track: Beatrice - Live

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Key Name
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value: Major

Badaling
type: MusicAlbum
date published: 2010-09-01

Past in Present
type: MusicAlbum
date published: 2015-09-18

And Now the Queen
type: MusicAlbum
date published: 2016-10-14

And Now the Queen
type: MusicAlbum
date published: 2016-10-14

Trädet EP Version
type: MusicAlbum
date published: 2018

Beatrice - Live
type: MusicRecording
duration: PT13M41S
duration ms: 821333
explicit: false
by artist: Parish
by artist: Mats Eilertsen
by artist: Thomas Strønen
by artist: Bobo Stenson
by artist: Fredrik Ljungkvist
in album: Rica
  type: MusicAlbum
  date published: 2021-05-24
popularity: 9
isrc code: NLB150400449
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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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 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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  date published: 2026-07-02T03:55:08Z
audio: Beatrice - Live
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