De vier Viltjes
type: MusicGroup
popularity: 16
followers: 1152
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x7360ff816907f6f5f2607634b2335fa106b90966864abf8944494e9283156316
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953762
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953762
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/b82a4c87-f65e-469c-b4ea-af63d841c8de.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/b82a4c87-f65e-469c-b4ea-af63d841c8de.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/b82a4c87-f65e-469c-b4ea-af63d841c8de
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T08:21:23Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x7360ff816907f6f5f2607634b2335fa106b90966864abf8944494e9283156316","name":"De vier Viltjes","registered_at":"2026-06-14T23:48:57Z","symbol":"NIM0615339","token_address":"0x229696c1a85a543d1f5d46b4c1ad987e81e012b4","type":"artist","uuid":"b82a4c87-f65e-469c-b4ea-af63d841c8de"}
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7360ff816907f6f5f2607634b2335fa106b90966864abf8944494e9283156316. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b82a4c87-f65e-469c-b4ea-af63d841c8de.json and https://artists.proofprofile.net/proofs/artist/b82a4c87-f65e-469c-b4ea-af63d841c8de.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T11:57:35Z
  text: {"copyright_id":"0x7360ff816907f6f5f2607634b2335fa106b90966864abf8944494e9283156316","name":"De vier Viltjes","registered_at":"2026-06-14T23:48:57Z","symbol":"NIM0615339","token_address":"0x229696c1a85a543d1f5d46b4c1ad987e81e012b4","type":"artist","uuid":"b82a4c87-f65e-469c-b4ea-af63d841c8de"}
album: Loekie Loekie
  type: MusicAlbum
  date published: 2016-01-03
album: Loekie Loekie
  type: MusicAlbum
  date published: 2016-01-03
album: Kijk, die vrouw heeft een snor
  type: MusicAlbum
  date published: 2016-12-27
album: Ga es bier halen
  type: MusicAlbum
  date published: 2016-12-27
album: Kijk, die vrouw heeft een snor
  type: MusicAlbum
  date published: 2016-12-27
album: Ga es bier halen
  type: MusicAlbum
  date published: 2016-12-27
album: Oh Wat Een Mooie Blonde
  type: MusicAlbum
  date published: 2017-12-18
album: Oh Wat Een Mooie Blonde
  type: MusicAlbum
  date published: 2017-12-18
album: Gekke Mensen
  type: MusicAlbum
  date published: 2019-01-25
album: Gekke Mensen
  type: MusicAlbum
  date published: 2019-01-25
album: Piet Moet Blijven
  type: MusicAlbum
  date published: 2019-02-07
album: Piet Moet Blijven
  type: MusicAlbum
  date published: 2019-02-07
album: Daar Heb Je Peter
  type: MusicAlbum
  date published: 2020-01-03
  track: Daar Heb Je Peter
    type: MusicRecording
    duration: PT3M4S
    duration ms: 184481
    explicit: false
    by artist: De vier Viltjes
    in album: Daar Heb Je Peter
      type: MusicAlbum
      date published: 2020-01-03
    isrc code: NLXN62000007
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-15T12:01:19+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xf3128041c7ec6999a62d64572939865fac93c979ed6f99009f1be8e7aee68e22
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958157
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958157
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLXN62000007
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-15T15:02:26Z
    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
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3128041c7ec6999a62d64572939865fac93c979ed6f99009f1be8e7aee68e22. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:02:26Z), 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/NLXN62000007.
      date published: 2026-07-15T15:02:26Z
    audio: Daar Heb Je Peter
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 134.595
      additional property: Musical Key
        type: PropertyValue
        value: 4
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.738
      additional property: Energy
        type: PropertyValue
        value: 0.972
      additional property: Speechiness
        type: PropertyValue
        value: 0.077
      additional property: Acousticness
        type: PropertyValue
        value: 0.241
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.292
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.93
      additional property: Loudness (dB)
        type: PropertyValue
        value: -2.08
      additional property: Key Name
        type: PropertyValue
        value: E
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Daar Heb Je Peter
  type: MusicAlbum
  date published: 2020-01-03
album: Uitschuifbare Handjes
  type: MusicAlbum
  date published: 2021-01-01
album: Geef Nooit Op
  type: MusicAlbum
  date published: 2021-10-22
album: Bek Vol Bier
  type: MusicAlbum
  date published: 2022-02-11
  track: Bek Vol Bier
    type: MusicRecording
    duration: PT2M56S
    duration ms: 176250
    explicit: false
    by artist: De vier Viltjes
    in album: Bek Vol Bier
      type: MusicAlbum
      date published: 2022-02-11
    isrc code: NLXN62200009
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-16T15:31:17+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xabda50ecee27587f86a86dd77c3ef6a510a3d35909f9ca0932df77849ae65ff3
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958300
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958300
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLXN62200009
    additional property: OTSTimestamp
    additional property: OTSVerifyInstructions
    subject of: OpenTimestamps Proof of Existence
    audio: Bek Vol Bier
album: Lekker Springen
album: Zomer Jaren 90
album: Één Familie
album: Spaar Geen Centen
album: Medicijnen
album: Laat Maar Waaien Medley
album: Jan Klaassen Medley

OTSTimestamp
type: PropertyValue
value: 2026-07-16T16:14:30Z

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 0xabda50ecee27587f86a86dd77c3ef6a510a3d35909f9ca0932df77849ae65ff3. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/NLXN62200009.
date published: 2026-07-16T16:14:30Z

Bek Vol Bier
type: AudioObject
additional property: Tempo (BPM)
  type: PropertyValue
  value: 129.971
additional property: Musical Key
  type: PropertyValue
  value: 8
additional property: Mode (Major/Minor)
  type: PropertyValue
  value: 1
additional property: Time Signature
  type: PropertyValue
  value: 4
additional property: Danceability
  type: PropertyValue
  value: 0.804
additional property: Energy
  type: PropertyValue
  value: 0.923
additional property: Speechiness
  type: PropertyValue
  value: 0.053
additional property: Acousticness
  type: PropertyValue
  value: 0.205
additional property: Instrumentalness
  type: PropertyValue
  value: 0
additional property: Liveness
  type: PropertyValue
  value: 0.336
additional property: Valence (Positivity)
  type: PropertyValue
  value: 0.965
additional property: Loudness (dB)
  type: PropertyValue
  value: -3.11
additional property: Key Name
  type: PropertyValue
  value: Ab
additional property: Mode Name
  type: PropertyValue
  value: Major

Lekker Springen
type: MusicAlbum
date published: 2022-12-30

Zomer Jaren 90
type: MusicAlbum
date published: 2023-07-14

Één Familie
type: MusicAlbum
date published: 2023-10-27

Spaar Geen Centen
type: MusicAlbum
date published: 2023-12-29
track: Spaar Geen Centen
  type: MusicRecording
  duration: PT2M51S
  duration ms: 171560
  explicit: false
  by artist: De vier Viltjes
  in album: Spaar Geen Centen
    type: MusicAlbum
    date published: 2023-12-29
  isrc code: NLXN62300067
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-17T08:25:11+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x56b872e04df8635c50b7ae8f4494955ba34ccd388cb3425ad7fd2a3b2d925cf7
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 958388
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/958388
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLXN62300067
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-17T09:14:21Z
  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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b872e04df8635c50b7ae8f4494955ba34ccd388cb3425ad7fd2a3b2d925cf7. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/NLXN62300067.
    date published: 2026-07-17T09:14:21Z
  audio: Spaar Geen Centen
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 146.021
    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: 0.621
    additional property: Energy
      type: PropertyValue
      value: 0.921
    additional property: Speechiness
      type: PropertyValue
      value: 0.068
    additional property: Acousticness
      type: PropertyValue
      value: 0.458
    additional property: Instrumentalness
      type: PropertyValue
      value: 0
    additional property: Liveness
      type: PropertyValue
      value: 0.082
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.907
    additional property: Loudness (dB)
      type: PropertyValue
      value: -6.011
    additional property: Key Name
      type: PropertyValue
      value: G
    additional property: Mode Name
      type: PropertyValue
      value: Major

Medicijnen
type: MusicAlbum
date published: 2025-01-17
track: Medicijnen
  type: MusicRecording
  duration: PT2M41S
  duration ms: 161034
  explicit: false
  by artist: De vier Viltjes
  in album: Medicijnen
    type: MusicAlbum
    date published: 2025-01-17
  isrc code: NLXN62500006
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-11T21:35:36+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x284ba69191862279ec84e757a8123b1406fc245234b47aa6f69554147533a82b
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 957616
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/957616
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLXN62500006
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-11T21:52:36Z
  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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x284ba69191862279ec84e757a8123b1406fc245234b47aa6f69554147533a82b. Chain 2 (Bitcoin): anchored in block 957616 (2026-07-11T21:52:36Z), 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/NLXN62500006.
    date published: 2026-07-11T21:52:36Z
  audio: Medicijnen
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 150.044
    additional property: Musical Key
      type: PropertyValue
      value: 0
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 0
    additional property: Time Signature
      type: PropertyValue
      value: 4
    additional property: Danceability
      type: PropertyValue
      value: 0.745
    additional property: Energy
      type: PropertyValue
      value: 0.947
    additional property: Speechiness
      type: PropertyValue
      value: 0.107
    additional property: Acousticness
      type: PropertyValue
      value: 0.145
    additional property: Instrumentalness
      type: PropertyValue
      value: 0
    additional property: Liveness
      type: PropertyValue
      value: 0.685
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.928
    additional property: Loudness (dB)
      type: PropertyValue
      value: -4.602
    additional property: Key Name
      type: PropertyValue
      value: C
    additional property: Mode Name
      type: PropertyValue
      value: Minor

Laat Maar Waaien Medley
type: MusicAlbum
date published: 2025-10-17

Jan Klaassen Medley
type: MusicAlbum
date published: 2025-11-07