Duo Karst
type: MusicGroup
popularity: 27
followers: 891
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xd54843861266805ff073f6e870afc3958650387e7d56c7c074076cbb30a1a053
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953407
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953407
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0fdfbcc8-ab57-46b3-94b8-5fb8e422f169.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/0fdfbcc8-ab57-46b3-94b8-5fb8e422f169.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/0fdfbcc8-ab57-46b3-94b8-5fb8e422f169
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-12T19:24:56Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xd54843861266805ff073f6e870afc3958650387e7d56c7c074076cbb30a1a053","name":"Duo Karst","registered_at":"2026-06-11T11:58:54Z","symbol":"NIM0021282","token_address":"0x0f59ae9ce72e3cb0d0b51a1ba0f9841e9ec18424","type":"artist","uuid":"0fdfbcc8-ab57-46b3-94b8-5fb8e422f169"}
additional property: OTSVerifyInstructions
  type: PropertyValue
  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
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd54843861266805ff073f6e870afc3958650387e7d56c7c074076cbb30a1a053. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0fdfbcc8-ab57-46b3-94b8-5fb8e422f169.json and https://artists.proofprofile.net/proofs/artist/0fdfbcc8-ab57-46b3-94b8-5fb8e422f169.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-12T19:24:56Z
  text: {"copyright_id":"0xd54843861266805ff073f6e870afc3958650387e7d56c7c074076cbb30a1a053","name":"Duo Karst","registered_at":"2026-06-11T11:58:54Z","symbol":"NIM0021282","token_address":"0x0f59ae9ce72e3cb0d0b51a1ba0f9841e9ec18424","type":"artist","uuid":"0fdfbcc8-ab57-46b3-94b8-5fb8e422f169"}
album: Tussen Dreumen En Zeker Weten
  type: MusicAlbum
  date published: 1983-06-01
album: Tussen Dreumen En Zeker Weten
  type: MusicAlbum
  date published: 1983-06-01
album: Moedertaal
  type: MusicAlbum
  date published: 1990-06-01
album: Moedertaal
  type: MusicAlbum
  date published: 1990-06-01
album: Geef Mij De Muziek: 1981-1991
  type: MusicAlbum
  date published: 1991-06-01
album: Geef Mij De Muziek
  type: MusicAlbum
  date published: 1991-06-01
album: Oude Schoolliedjes - Deel 4
  type: MusicAlbum
  date published: 1993-06-04
album: Oude Schoolliedjes - Deel 3
  type: MusicAlbum
  date published: 1993-06-04
album: Oude Schoolliedjes - Deel 1
  type: MusicAlbum
  date published: 1993-06-04
album: Oude Schoolliedjes, Deel 4
  type: MusicAlbum
  date published: 1993-06-04
  track: Langs Berg En Dal
    type: MusicRecording
    duration: PT3M3S
    duration ms: 183120
    explicit: false
    by artist: Duo Karst
    in album: Oude Schoolliedjes, Deel 4
      type: MusicAlbum
      date published: 1993-06-04
    isrc code: NLRZ89300061
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-16T04:43:53+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x5ac786bae74520faa4f6ec8a6acfb06e9cec1861e54c301afb138b8c4bbe46d5
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958242
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958242
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLRZ89300061
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-16T05:02:52Z
    additional property: 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 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
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac786bae74520faa4f6ec8a6acfb06e9cec1861e54c301afb138b8c4bbe46d5. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/NLRZ89300061.
      date published: 2026-07-16T05:02:52Z
    audio: Langs Berg En Dal
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 104.674
      additional property: Musical Key
        type: PropertyValue
        value: 9
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 3
      additional property: Danceability
        type: PropertyValue
        value: 0.432
      additional property: Energy
        type: PropertyValue
        value: 0.109
      additional property: Speechiness
        type: PropertyValue
        value: 0.028
      additional property: Acousticness
        type: PropertyValue
        value: 0.53
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.212
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.347
      additional property: Loudness (dB)
        type: PropertyValue
        value: -18.926
      additional property: Key Name
        type: PropertyValue
        value: A
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Oude Schoolliedjes - Deel 2
  type: MusicAlbum
  date published: 1993-06-04
album: Oude Schoolliedjes, Deel 1
  type: MusicAlbum
  date published: 1993-06-04
  track: Hutje Bij De Zee
    type: MusicRecording
    duration: PT3M7S
    duration ms: 187320
    explicit: false
    by artist: Duo Karst
    in album: Oude Schoolliedjes, Deel 1
      type: MusicAlbum
      date published: 1993-06-04
    isrc code: NLRZ89300001
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-17T09:13:27+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xc1d6fcf6d8d9092e50f031a8a42ae41ce753fac8de6c91af7444e581a88d4d36
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958390
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958390
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLRZ89300001
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-17T09:35:49Z
    additional property: 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 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
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d6fcf6d8d9092e50f031a8a42ae41ce753fac8de6c91af7444e581a88d4d36. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/NLRZ89300001.
      date published: 2026-07-17T09:35:49Z
    audio: Hutje Bij De Zee
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 92.955
      additional property: Musical Key
      additional property: Mode (Major/Minor)
      additional property: Time Signature
      additional property: Danceability
      additional property: Energy
      additional property: Speechiness
      additional property: Acousticness
      additional property: Instrumentalness
      additional property: Liveness
      additional property: Valence (Positivity)
      additional property: Loudness (dB)
      additional property: Key Name
      additional property: Mode Name
  track: In Een Groen Knollenland
  track: 'K Heb M'n Wagen Volgeladen
  track: Onder Moeders Paraplu
album: Oude Schoolliedjes, Deel 2
album: Oude Schoolliedjes, Deel 3
album: Kerst Met Karst
album: Liever Een Mus In De Haand, As Een Doev' Op Het Dak
album: Oude Schoolliedjes - Deel 5
album: Oude Schoolliedjes, Deel 5
album: De Dichter En De Oel
album: Oude Schoolliedjes - Deel 6
album: Oude Schoolliedjes, Deel 6
album: Oude Schoolliedjes, Deel 7
album: Oude Schoolliedjes, Deel 8
album: Oude Schoolliedjes - Deel 7
album: Oude Schoolliedjes - Deel 9
album: Oude Schoolliedjes, Deel 9
album: Oude Schoolliedjes- Deel 10
album: Zuidenveldlied en Daler Volkslied
album: Oude Schoolliedjes, Deel 10
album: Oude Schoolliedjes, Deel 11
album: Oude Schoolliedjes, Deel 12
album: Vlinder Van 20 Lentes: 20 Jaar Duo Karst
album: Vlinder Van 20 Lentes - 20 Jaar Duo Karst
album: 't Vuult Zo Warm
album: Kerst Met Karst (Deel II)
album: Kerst Met Karst, Deel 2
album: Oude Schoolliedjes, Deel 13
album: Oude Schoolliedjes, Deel 14
album: Oude Schoolliedjes, Deel 15
album: Oude Schoolliedjes - Deel 15
album: Oude Schoolliedjes - Deel 14
album: Oude Schoolliedjes- Deel 13

Musical Key
type: PropertyValue
value: 4

Mode (Major/Minor)
type: PropertyValue
value: 1

Time Signature
type: PropertyValue
value: 4

Danceability
type: PropertyValue
value: 0.53

Energy
type: PropertyValue
value: 0.213

Speechiness
type: PropertyValue
value: 0.027

Acousticness
type: PropertyValue
value: 0.553

Instrumentalness
type: PropertyValue
value: 0

Liveness
type: PropertyValue
value: 0.179

Valence (Positivity)
type: PropertyValue
value: 0.286

Loudness (dB)
type: PropertyValue
value: -13.318

Key Name
type: PropertyValue
value: E

Mode Name
type: PropertyValue
value: Major

In Een Groen Knollenland
type: MusicRecording
duration: PT1M59S
duration ms: 119760
explicit: false
by artist: Duo Karst
in album: Oude Schoolliedjes, Deel 1
  type: MusicAlbum
  date published: 1993-06-04
isrc code: NLRZ89300003
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-04T03:05:09+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xa78d41be525cbfc0db9cd2e9a7cafaa5cc8e8d0e3e7c8714a1ff972d71b2b4b3
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 956634
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/956634
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLRZ89300003
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-04T10:04:33Z
additional property: 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 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
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa78d41be525cbfc0db9cd2e9a7cafaa5cc8e8d0e3e7c8714a1ff972d71b2b4b3. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NLRZ89300003.
  date published: 2026-07-04T10:04:33Z
audio: In Een Groen Knollenland
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 90.689
  additional property: Musical Key
    type: PropertyValue
    value: 9
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 4
  additional property: Danceability
    type: PropertyValue
    value: 0.747
  additional property: Energy
    type: PropertyValue
    value: 0.377
  additional property: Speechiness
    type: PropertyValue
    value: 0.027
  additional property: Acousticness
    type: PropertyValue
    value: 0.57
  additional property: Instrumentalness
    type: PropertyValue
    value: 0
  additional property: Liveness
    type: PropertyValue
    value: 0.133
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.838
  additional property: Loudness (dB)
    type: PropertyValue
    value: -11.455
  additional property: Key Name
    type: PropertyValue
    value: A
  additional property: Mode Name
    type: PropertyValue
    value: Major

'K Heb M'n Wagen Volgeladen
type: MusicRecording
duration: PT1M34S
duration ms: 94920
explicit: false
by artist: Duo Karst
in album: Oude Schoolliedjes, Deel 1
  type: MusicAlbum
  date published: 1993-06-04
isrc code: NLRZ89300007
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-18T17:46:33+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x0917bc1b2c1e6574a0499fada869179b2cf2de1a0fc5a583d8609d1c34d0d25e
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 958594
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/958594
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLRZ89300007
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-18T18:05:01Z
additional property: 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 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
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0917bc1b2c1e6574a0499fada869179b2cf2de1a0fc5a583d8609d1c34d0d25e. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/NLRZ89300007.
  date published: 2026-07-18T18:05:01Z
audio: 'K Heb M'n Wagen Volgeladen
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 111.47
  additional property: Musical Key
    type: PropertyValue
    value: 9
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 4
  additional property: Danceability
    type: PropertyValue
    value: 0.748
  additional property: Energy
    type: PropertyValue
    value: 0.393
  additional property: Speechiness
    type: PropertyValue
    value: 0.063
  additional property: Acousticness
    type: PropertyValue
    value: 0.51
  additional property: Instrumentalness
    type: PropertyValue
    value: 0
  additional property: Liveness
    type: PropertyValue
    value: 0.155
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.776
  additional property: Loudness (dB)
    type: PropertyValue
    value: -11.228
  additional property: Key Name
    type: PropertyValue
    value: A
  additional property: Mode Name
    type: PropertyValue
    value: Major

Onder Moeders Paraplu
type: MusicRecording
duration: PT1M58S
duration ms: 118560
explicit: false
by artist: Duo Karst
in album: Oude Schoolliedjes, Deel 1
  type: MusicAlbum
  date published: 1993-06-04
isrc code: NLRZ89300010
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-19T05:00:31+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xeda8e7190b03281e9847190ff2d695c7feec86b0a8d4bc668f4b5a8edc61d4d1
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 958668
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/958668
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLRZ89300010
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-19T05:16:11Z
additional property: 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 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
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda8e7190b03281e9847190ff2d695c7feec86b0a8d4bc668f4b5a8edc61d4d1. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), 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/NLRZ89300010.
  date published: 2026-07-19T05:16:11Z
audio: Onder Moeders Paraplu
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 80.465
  additional property: Musical Key
    type: PropertyValue
    value: 0
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 4
  additional property: Danceability
    type: PropertyValue
    value: 0.697
  additional property: Energy
    type: PropertyValue
    value: 0.382
  additional property: Speechiness
    type: PropertyValue
    value: 0.029
  additional property: Acousticness
    type: PropertyValue
    value: 0.427
  additional property: Instrumentalness
    type: PropertyValue
    value: 0
  additional property: Liveness
    type: PropertyValue
    value: 0.314
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.834
  additional property: Loudness (dB)
    type: PropertyValue
    value: -12.769
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Major

Oude Schoolliedjes, Deel 2
type: MusicAlbum
date published: 1993-06-04
track: Hoe Zachtkens Glijdt Ons Bootje
  type: MusicRecording
  duration: PT2M17S
  duration ms: 137040
  explicit: false
  by artist: Duo Karst
  in album: Oude Schoolliedjes, Deel 2
    type: MusicAlbum
    date published: 1993-06-04
  isrc code: NLRZ89300021
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-16T04:49:52+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x83e7fb8a4ad7ada1d63c6c065d8ad0539ffd39dc0aa3efba4e8d8cdda198dbb3
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 958242
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/958242
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLRZ89300021
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-16T05:02:52Z
  additional property: 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 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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83e7fb8a4ad7ada1d63c6c065d8ad0539ffd39dc0aa3efba4e8d8cdda198dbb3. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/NLRZ89300021.
    date published: 2026-07-16T05:02:52Z
  audio: Hoe Zachtkens Glijdt Ons Bootje
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 137.679
    additional property: Musical Key
      type: PropertyValue
      value: 9
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 3
    additional property: Danceability
      type: PropertyValue
      value: 0.427
    additional property: Energy
      type: PropertyValue
      value: 0.207
    additional property: Speechiness
      type: PropertyValue
      value: 0.025
    additional property: Acousticness
      type: PropertyValue
      value: 0.278
    additional property: Instrumentalness
      type: PropertyValue
      value: 0
    additional property: Liveness
      type: PropertyValue
      value: 0.327
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.468
    additional property: Loudness (dB)
      type: PropertyValue
      value: -16.618
    additional property: Key Name
      type: PropertyValue
      value: A
    additional property: Mode Name
      type: PropertyValue
      value: Major
track: Knaapje Zag Een Roosje Staan
  type: MusicRecording
  duration: PT2M21S
  duration ms: 141240
  explicit: false
  by artist: Duo Karst
  in album: Oude Schoolliedjes, Deel 2
    type: MusicAlbum
    date published: 1993-06-04
  isrc code: NLRZ89300024
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-05T14:05:44+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xa245c779cf80513b00c618613c733aee7bb8dd2d5fb91fbfed33a5db52840bdb
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 956822
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/956822
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLRZ89300024
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-05T18:48:28Z
  additional property: 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 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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa245c779cf80513b00c618613c733aee7bb8dd2d5fb91fbfed33a5db52840bdb. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLRZ89300024.
    date published: 2026-07-05T18:48:28Z
  audio: Knaapje Zag Een Roosje Staan
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 137.323
    additional property: Musical Key
      type: PropertyValue
      value: 9
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 3
    additional property: Danceability
      type: PropertyValue
      value: 0.497
    additional property: Energy
      type: PropertyValue
      value: 0.238
    additional property: Speechiness
      type: PropertyValue
      value: 0.028
    additional property: Acousticness
      type: PropertyValue
      value: 0.229
    additional property: Instrumentalness
      type: PropertyValue
      value: 0
    additional property: Liveness
      type: PropertyValue
      value: 0.154
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.34
    additional property: Loudness (dB)
      type: PropertyValue
      value: -14.944
    additional property: Key Name
      type: PropertyValue
      value: A
    additional property: Mode Name
      type: PropertyValue
      value: Major

Oude Schoolliedjes, Deel 3
type: MusicAlbum
date published: 1993-06-04
track: Op De Grote Stille Heide
  type: MusicRecording
  duration: PT3M3S
  duration ms: 183600
  explicit: false
  by artist: Duo Karst
  in album: Oude Schoolliedjes, Deel 3
    type: MusicAlbum
    date published: 1993-06-04
  isrc code: NLRZ89300044
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-15T21:54:00+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x15bbb0738ebdf33e84988d2a41663d27ff6feab391e5808eb681f43ec23ebe65
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 958208
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/958208
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLRZ89300044
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-15T22:40:25Z
  additional property: 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 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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15bbb0738ebdf33e84988d2a41663d27ff6feab391e5808eb681f43ec23ebe65. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/NLRZ89300044.
    date published: 2026-07-15T22:40:25Z
  audio: Op De Grote Stille Heide
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 105.403
    additional property: Musical Key
      type: PropertyValue
      value: 9
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 4
    additional property: Danceability
      type: PropertyValue
      value: 0.625
    additional property: Energy
      type: PropertyValue
      value: 0.185
    additional property: Speechiness
      type: PropertyValue
      value: 0.027
    additional property: Acousticness
      type: PropertyValue
      value: 0.652
    additional property: Instrumentalness
      type: PropertyValue
      value: 0
    additional property: Liveness
      type: PropertyValue
      value: 0.155
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.549
    additional property: Loudness (dB)
      type: PropertyValue
      value: -17.094
    additional property: Key Name
      type: PropertyValue
      value: A
    additional property: Mode Name
      type: PropertyValue
      value: Major

Kerst Met Karst
type: MusicAlbum
date published: 1994-06-01

Liever Een Mus In De Haand, As Een Doev' Op Het Dak
type: MusicAlbum
date published: 1996-06-07

Oude Schoolliedjes - Deel 5
type: MusicAlbum
date published: 1997-06-06

Oude Schoolliedjes, Deel 5
type: MusicAlbum
date published: 1997-06-06
track: Roodborstje Tikt
  type: MusicRecording
  duration: PT2M14S
  duration ms: 134760
  explicit: false
  by artist: Duo Karst
  in album: Oude Schoolliedjes, Deel 5
    type: MusicAlbum
    date published: 1997-06-06
  isrc code: NLRZ89700001
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-17T07:14:42+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x222cd8f9d916fd903e8eeca10641241d1d5c7789ee5486553087a80fec7b9b26
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 958383
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/958383
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLRZ89700001
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-17T08:20:01Z
  additional property: 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 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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222cd8f9d916fd903e8eeca10641241d1d5c7789ee5486553087a80fec7b9b26. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/NLRZ89700001.
    date published: 2026-07-17T08:20:01Z
  audio: Roodborstje Tikt
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 172.079
    additional property: Musical Key
      type: PropertyValue
      value: 7
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 4
    additional property: Danceability
      type: PropertyValue
      value: 0.558
    additional property: Energy
      type: PropertyValue
      value: 0.299
    additional property: Speechiness
      type: PropertyValue
      value: 0.031
    additional property: Acousticness
      type: PropertyValue
      value: 0.276
    additional property: Instrumentalness
      type: PropertyValue
      value: 0
    additional property: Liveness
      type: PropertyValue
      value: 0.235
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.703
    additional property: Loudness (dB)
      type: PropertyValue
      value: -15.133
    additional property: Key Name
      type: PropertyValue
      value: G
    additional property: Mode Name
      type: PropertyValue
      value: Major

De Dichter En De Oel
type: MusicAlbum
date published: 1998-06-01

Oude Schoolliedjes - Deel 6
type: MusicAlbum
date published: 1999-06-04

Oude Schoolliedjes, Deel 6
type: MusicAlbum
date published: 1999-06-04
track: Kom Mee Naar Buiten Allemaal
  type: MusicRecording
  duration: PT2M27S
  duration ms: 147600
  explicit: false
  by artist: Duo Karst
  in album: Oude Schoolliedjes, Deel 6
    type: MusicAlbum
    date published: 1999-06-04
  isrc code: NLRZ89900005
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-19T03:59:59+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xbf8e8063033885f5bcb9fa03d61454bcd0434a2969455428a0e5df17c39293e4
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 958656
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/958656
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLRZ89900005
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-19T04:04:08Z
  additional property: 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 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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8e8063033885f5bcb9fa03d61454bcd0434a2969455428a0e5df17c39293e4. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/NLRZ89900005.
    date published: 2026-07-19T04:04:08Z
  audio: Kom Mee Naar Buiten Allemaal
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 120.038
    additional property: Musical Key
      type: PropertyValue
      value: 9
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 4
    additional property: Danceability
      type: PropertyValue
      value: 0.667
    additional property: Energy
      type: PropertyValue
      value: 0.176
    additional property: Speechiness
      type: PropertyValue
      value: 0.035
    additional property: Acousticness
      type: PropertyValue
      value: 0.049
    additional property: Instrumentalness
      type: PropertyValue
      value: 0
    additional property: Liveness
      type: PropertyValue
      value: 0.067
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.394
    additional property: Loudness (dB)
      type: PropertyValue
      value: -16.938
    additional property: Key Name
      type: PropertyValue
      value: A
    additional property: Mode Name
      type: PropertyValue
      value: Major

Oude Schoolliedjes, Deel 7
type: MusicAlbum
date published: 1999-06-04
track: Waar De Blanke Top Der Duinen
  type: MusicRecording
  duration: PT2M28S
  duration ms: 148080
  explicit: false
  by artist: Duo Karst
  in album: Oude Schoolliedjes, Deel 7
    type: MusicAlbum
    date published: 1999-06-04
  isrc code: NLRZ89900026
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-18T17:01:05+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x403b933829153da1350d2f8fa1393cfb20cd57060988c53247071972c9e9674c
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 958590
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/958590
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLRZ89900026
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-18T17:28:56Z
  additional property: 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 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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x403b933829153da1350d2f8fa1393cfb20cd57060988c53247071972c9e9674c. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/NLRZ89900026.
    date published: 2026-07-18T17:28:56Z
  audio: Waar De Blanke Top Der Duinen
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 82.089
    additional property: Musical Key
      type: PropertyValue
      value: 3
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 3
    additional property: Danceability
      type: PropertyValue
      value: 0.477
    additional property: Energy
      type: PropertyValue
      value: 0.222
    additional property: Speechiness
      type: PropertyValue
      value: 0.033
    additional property: Acousticness
      type: PropertyValue
      value: 0.24
    additional property: Instrumentalness
      type: PropertyValue
      value: 0
    additional property: Liveness
      type: PropertyValue
      value: 0.173
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.352
    additional property: Loudness (dB)
      type: PropertyValue
      value: -14.238
    additional property: Key Name
      type: PropertyValue
      value: Eb
    additional property: Mode Name
      type: PropertyValue
      value: Major

Oude Schoolliedjes, Deel 8
type: MusicAlbum
date published: 1999-06-04

Oude Schoolliedjes - Deel 7
type: MusicAlbum
date published: 1999-06-04

Oude Schoolliedjes - Deel 9
type: MusicAlbum
date published: 2000-06-02

Oude Schoolliedjes, Deel 9
type: MusicAlbum
date published: 2000-06-02
track: Droomland
  type: MusicRecording
  duration: PT3M58S
  duration ms: 238080
  explicit: false
  by artist: Duo Karst
  in album: Oude Schoolliedjes, Deel 9
    type: MusicAlbum
    date published: 2000-06-02
  isrc code: NLRZ80100030
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-16T03:38:35+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x33f18ff8740550b0065839ee8964d0ee84994cb37d60ae5cd6aa288cdb742b0d
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 958234
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/958234
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLRZ80100030
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-16T03:46:09Z
  additional property: 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 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
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33f18ff8740550b0065839ee8964d0ee84994cb37d60ae5cd6aa288cdb742b0d. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/NLRZ80100030.
    date published: 2026-07-16T03:46:09Z
  audio: Droomland
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 112.099
    additional property: Musical Key
      type: PropertyValue
      value: 7
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 3
    additional property: Danceability
      type: PropertyValue
      value: 0.587
    additional property: Energy
      type: PropertyValue
      value: 0.325
    additional property: Speechiness
      type: PropertyValue
      value: 0.026
    additional property: Acousticness
      type: PropertyValue
      value: 0.555
    additional property: Instrumentalness
      type: PropertyValue
      value: 0
    additional property: Liveness
      type: PropertyValue
      value: 0.11
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Oude Schoolliedjes- Deel 10
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Zuidenveldlied en Daler Volkslied
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Oude Schoolliedjes, Deel 10
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track: Mij Sarie Marijs
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Oude Schoolliedjes, Deel 11
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Oude Schoolliedjes, Deel 12
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Vlinder Van 20 Lentes: 20 Jaar Duo Karst
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Vlinder Van 20 Lentes - 20 Jaar Duo Karst
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't Vuult Zo Warm
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't Vuult Zo Warm
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Kerst Met Karst (Deel II)
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Kerst Met Karst, Deel 2
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Oude Schoolliedjes, Deel 13
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Oude Schoolliedjes, Deel 14
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Oude Schoolliedjes, Deel 15
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Oude Schoolliedjes - Deel 15
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Oude Schoolliedjes - Deel 14
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Oude Schoolliedjes- Deel 13
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