Marjolein Keijzer
type: MusicGroup
popularity: 7
followers: 368
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xb0079038b8ea54555cfad4e46713757bbfb59d98b523414bbc5074b5a02ebdc0
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954066
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954066
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/75e0bd86-1c2e-4048-ae82-edf68e88dbff.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/75e0bd86-1c2e-4048-ae82-edf68e88dbff.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/75e0bd86-1c2e-4048-ae82-edf68e88dbff
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xb0079038b8ea54555cfad4e46713757bbfb59d98b523414bbc5074b5a02ebdc0","name":"Marjolein Keijzer","registered_at":"2026-06-17T06:41:05Z","symbol":"NIM1312787","token_address":"0xc26af859eb2eb6c2af760c0f4800a7f9ce8d3ec9","type":"artist","uuid":"75e0bd86-1c2e-4048-ae82-edf68e88dbff"}
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 0xb0079038b8ea54555cfad4e46713757bbfb59d98b523414bbc5074b5a02ebdc0. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/75e0bd86-1c2e-4048-ae82-edf68e88dbff.json and https://artists.proofprofile.net/proofs/artist/75e0bd86-1c2e-4048-ae82-edf68e88dbff.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0xb0079038b8ea54555cfad4e46713757bbfb59d98b523414bbc5074b5a02ebdc0","name":"Marjolein Keijzer","registered_at":"2026-06-17T06:41:05Z","symbol":"NIM1312787","token_address":"0xc26af859eb2eb6c2af760c0f4800a7f9ce8d3ec9","type":"artist","uuid":"75e0bd86-1c2e-4048-ae82-edf68e88dbff"}
album: De Wind
  type: MusicAlbum
  date published: 2018-06-14
album: De Wind
  type: MusicAlbum
  date published: 2018-06-14
album: Dichtbij
  type: MusicAlbum
  date published: 2018-06-30
album: Dichtbij
  type: MusicAlbum
  date published: 2018-06-30
album: Dichtbij
  type: MusicAlbum
  date published: 2018-06-30
album: Koning van de vrede
  type: MusicAlbum
  date published: 2018-12-07
album: Beoordeel de dag
  type: MusicAlbum
  date published: 2019
album: Beoordeel de dag
  type: MusicAlbum
  date published: 2019-05-31
album: Blijdschap
  type: MusicAlbum
  date published: 2020-11-06
album: Woorden van vroeger (Als een hert)
  type: MusicAlbum
  date published: 2021-01-12
album: Hoe mooi
  type: MusicAlbum
  date published: 2021-04-08
album: Geliefde
  type: MusicAlbum
  date published: 2022-04-21
  track: Geliefde
    type: MusicRecording
    duration: PT3M13S
    duration ms: 193779
    explicit: false
    by artist: Marjolein Keijzer
    in album: Geliefde
      type: MusicAlbum
      date published: 2022-04-21
    isrc code: QZPJ32159891
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-19T08:03:41+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x2370204fb7ccf4a2ca06ea0d5882c2302f2c7cf1395f2c0d1949080c9efaf604
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958700
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958700
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZPJ32159891
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-19T08:09:50Z
    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 0x2370204fb7ccf4a2ca06ea0d5882c2302f2c7cf1395f2c0d1949080c9efaf604. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QZPJ32159891.
      date published: 2026-07-19T08:09:50Z
    audio: Geliefde
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 131.966
      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: 0.594
      additional property: Energy
        type: PropertyValue
        value: 0.298
      additional property: Speechiness
        type: PropertyValue
        value: 0.029
      additional property: Acousticness
        type: PropertyValue
        value: 0.879
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.002
      additional property: Liveness
        type: PropertyValue
        value: 0.108
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.24
      additional property: Loudness (dB)
        type: PropertyValue
        value: -14.361
      additional property: Key Name
        type: PropertyValue
        value: A
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: Hier en nu
  type: MusicAlbum
  date published: 2022-10-21
  track: Hoe mooi
    type: MusicRecording
    duration: PT3M52S
    duration ms: 232381
    explicit: false
    by artist: Marjolein Keijzer
    in album: Hier en nu
      type: MusicAlbum
      date published: 2022-10-21
    isrc code: NLF6K2200003
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-05T08:15:34+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xe3f05634f8745c0c10ac0ed69b09cdc83c9ce44b51edcc3e14cdba1d0adbdc01
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956772
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956772
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLF6K2200003
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-05T10:01:46Z
    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 0xe3f05634f8745c0c10ac0ed69b09cdc83c9ce44b51edcc3e14cdba1d0adbdc01. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NLF6K2200003.
      date published: 2026-07-05T10:01:46Z
    audio: Hoe mooi
album: Tijd als deze
album: Niet alleen
album: Ik leef

Hoe mooi
type: AudioObject
additional property: Tempo (BPM)
  type: PropertyValue
  value: 125.012
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: 0.809
additional property: Energy
  type: PropertyValue
  value: 0.453
additional property: Speechiness
  type: PropertyValue
  value: 0.033
additional property: Acousticness
  type: PropertyValue
  value: 0.182
additional property: Instrumentalness
  type: PropertyValue
  value: 0
additional property: Liveness
  type: PropertyValue
  value: 0.066
additional property: Valence (Positivity)
  type: PropertyValue
  value: 0.554
additional property: Loudness (dB)
  type: PropertyValue
  value: -7.504
additional property: Key Name
  type: PropertyValue
  value: C
additional property: Mode Name
  type: PropertyValue
  value: Major

Tijd als deze
type: MusicAlbum
date published: 2024-05-02

Niet alleen
type: MusicAlbum
date published: 2025-05-01

Ik leef
type: MusicAlbum
date published: 2025-09-25