Jan & Kjeld
type: MusicGroup
genre: schlager
description: Jan & Kjeld were a musical duo from Denmark, consisting of brothers Jan and Kjeld Wennick, both singers and banjo players. The duo, active in the late 1950s and early 1960s, was especially successful
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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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album: Banjo Boy
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  date published: 1959-03-23
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      date published: 1959-03-23
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    subject of: OpenTimestamps Proof of Existence
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      date published: 2026-07-04T10:04:33Z
    audio: Banjo Boy
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album: A Tisket a Tasket / Sweet Sue (feat. Gert Wilden et son orchestre) [Mono Version]
  type: MusicAlbum
  date published: 1961-01-01
album: Banjo Boy (feat. Gert Wilden and His Orchestra) [Mono Version]
  type: MusicAlbum
  date published: 1961-01-01
album: Banjo Boy / Mach doch nicht immer soviel Wind (feat. Gert Wilden et son orchestre) [Mono Version]
  type: MusicAlbum
  date published: 1961-01-01
album: Tingelingeling dit son banjo / Mélodie d'un sous (feat. Gert Wilden et son orchestre) [Mono version]
  type: MusicAlbum
  date published: 1961-01-01
album: Les banjo boys (feat. Gert Wilden et son orchestre) [Mono version]
  type: MusicAlbum
  date published: 1961-01-01
album: When the Saints Go Marching In / Tiger Rag (feat. Bob Langnoff et son orchestre) [Mono Version]
  type: MusicAlbum
  date published: 1961-01-01
album: Zwei kleine italiener (feat. Gert Wilden Et Son Orchestre) [Mono Version]
  type: MusicAlbum
  date published: 1962-01-01
album: Down by the Riverside
  type: MusicAlbum
  date published: 2009
album: Down by the Riverside
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  date published: 2009
album: Down by the Riverside
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album: Down By The Riverside
  type: MusicAlbum
  date published: 2009-11-27
album: Viele bunte Lichter
  type: MusicAlbum
  date published: 2010
album: Viele bunte Lichter
  type: MusicAlbum
  date published: 2010-10-01
album: Mein Banjo singt
  type: MusicAlbum
  date published: 2013-02-12
album: Jan & Kjeld
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  date published: 2014-01-25
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    by artist: Jan & Kjeld
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      date published: 2014-01-25
    genre: schlager
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    audio: Banjo Boy
album: Masterpieces presents Jan & Kjeld: Hits & Raritäten
album: Masterpieces presents Jan & Kjeld: 10 Greatest Hits
album: Masterpieces presents Jan & Kjeld: 5 Greatest Hits
album: Masterpieces presents Jan & Kjeld: Banjo Boy / Tingelingeling, mein Banjo singt / Träumen kann man was man will (3 greatest hits)
album: Don't Raise a Storm (Mach Dich Nicht Immer Soviel Wind)
album: Super Sänger
track: Banjo boy

Banjo boy
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by artist: Jan & Kjeld
in album: 100 Deutsche Schlager Hits der 50er und 60er Jahre
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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
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-21T17:00:19Z
audio: Banjo boy
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OTSVerificationAPI
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OTSTimestamp
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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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0982d68433b94bdbd8bbd59f7248bb18a627472745756bd676200b88d6bfa058. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEF705900105.
date published: 2026-07-17T19:12:23Z

Banjo Boy
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Masterpieces presents Jan & Kjeld: Hits & Raritäten
type: MusicAlbum
date published: 2014-04-30

Masterpieces presents Jan & Kjeld: 10 Greatest Hits
type: MusicAlbum
date published: 2014-07-06

Masterpieces presents Jan & Kjeld: 5 Greatest Hits
type: MusicAlbum
date published: 2014-07-13

Masterpieces presents Jan & Kjeld: Banjo Boy / Tingelingeling, mein Banjo singt / Träumen kann man was man will (3 greatest hits)
type: MusicAlbum
date published: 2014-07-20

Banjo Boy
type: MusicAlbum
date published: 2015-10-06

Don't Raise a Storm (Mach Dich Nicht Immer Soviel Wind)
type: MusicAlbum
date published: 2017-03-17

Banjo Boy
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date published: 2017-03-17
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  subject of: OpenTimestamps Proof of Existence
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    date published: 2026-07-04T11:19:20Z
  audio: Banjo Boy
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Super Sänger
type: MusicAlbum
date published: 2020-06-26