Gerard Kleijn
type: MusicGroup
popularity: 13
followers: 209
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
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additional property: OTSVerificationAPI
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additional property: OTSCanonicalRecord
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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 0x8e188fbb434c47dd8710fa2669d0724b0043f120f4936f4eae42f46a1015fcab. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/63cfedc3-b564-4619-bdf6-1c96549e270d.json and https://artists.proofprofile.net/proofs/artist/63cfedc3-b564-4619-bdf6-1c96549e270d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-14T21:49:28Z
  text: {"copyright_id":"0x8e188fbb434c47dd8710fa2669d0724b0043f120f4936f4eae42f46a1015fcab","name":"Gerard Kleijn","registered_at":"2026-06-14T15:00:13Z","symbol":"NIM0489243","token_address":"0xea99c1679226be84bdb432b962a131013d089f0f","type":"artist","uuid":"63cfedc3-b564-4619-bdf6-1c96549e270d"}
album: Big Moves (feat. Fay Claassen)
  type: MusicAlbum
  date published: 1998-01-01
album: Love Quotes
  type: MusicAlbum
  date published: 2002-01-01
album: Love Quotes
  type: MusicAlbum
  date published: 2002-01-01
  track: Impromptu 1
    type: MusicRecording
    duration: PT0M57S
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    explicit: false
    by artist: Gerard Kleijn
    in album: Love Quotes
      type: MusicAlbum
      date published: 2002-01-01
    isrc code: USCGJ0942076
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
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      type: PropertyValue
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      type: PropertyValue
      value: https://blockstream.info/api/block-height/956656
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGJ0942076
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-04T14:03:39Z
    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 0x6feed04bcbbad8dc5789f91e3fead4174685d0adb7ecdc1445c318c12bfa8339. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/USCGJ0942076.
      date published: 2026-07-04T14:03:39Z
    audio: Impromptu 1
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 84.882
      additional property: Musical Key
        type: PropertyValue
        value: 1
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 5
      additional property: Danceability
        type: PropertyValue
        value: 0.452
      additional property: Energy
        type: PropertyValue
        value: 0.008
      additional property: Speechiness
        type: PropertyValue
        value: 0.034
      additional property: Acousticness
        type: PropertyValue
        value: 0.857
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.882
      additional property: Liveness
        type: PropertyValue
        value: 0.125
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.165
      additional property: Loudness (dB)
        type: PropertyValue
        value: -21.865
      additional property: Key Name
        type: PropertyValue
        value: C#
      additional property: Mode Name
        type: PropertyValue
        value: Major
  track: Impromptu 3
    type: MusicRecording
    duration: PT1M34S
    duration ms: 94484
    explicit: false
    by artist: Gerard Kleijn
    in album: Love Quotes
      type: MusicAlbum
      date published: 2002-01-01
    isrc code: USCGJ0942079
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
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      type: PropertyValue
      value: 2026-07-18T21:34:15+00:00
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      type: PropertyValue
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    additional property: OTSBitcoinBlock
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    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958617
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGJ0942079
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-18T22:07:13Z
    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 0x3bad4086c2018577c52cb4066ca3edc1c01a90cfff136fc7926c865242909c5b. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/USCGJ0942079.
      date published: 2026-07-18T22:07:13Z
    audio: Impromptu 3
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 75.332
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        type: PropertyValue
        value: 7
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
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      additional property: Energy
        type: PropertyValue
        value: 0.075
      additional property: Speechiness
        type: PropertyValue
        value: 0.078
      additional property: Acousticness
        type: PropertyValue
        value: 0.914
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.765
      additional property: Liveness
        type: PropertyValue
        value: 0.142
      additional property: Valence (Positivity)
      additional property: Loudness (dB)
      additional property: Key Name
      additional property: Mode Name
album: New World
album: Le Flirt De Satie (Live at the Bird's Eye)
album: The Long Journey
album: Bach Reflections
album: Knots
album: It Never Entered My Mind
album: The Christmas Song
album: Answer Me (Mütterlein)
album: I Get Along Without You Very Well
album: Noël Noël (French - English Carol)
album: Sing We Now Of Christmas
album: Radio Days
album: Sleep My Love Sleep
album: Gaga Smiles
album: Birds On A Wire
album: Angels From The Realms Of Glory

Valence (Positivity)
type: PropertyValue
value: 0.488

Loudness (dB)
type: PropertyValue
value: -20.646

Key Name
type: PropertyValue
value: G

Mode Name
type: PropertyValue
value: Minor

New World
type: MusicAlbum
date published: 2003-01-01

Le Flirt De Satie (Live at the Bird's Eye)
type: MusicAlbum
date published: 2006-01-01

The Long Journey
type: MusicAlbum
date published: 2006-02-02

Bach Reflections
type: MusicAlbum
date published: 2013-09-18

Knots
type: MusicAlbum
date published: 2014-10-06

It Never Entered My Mind
type: MusicAlbum
date published: 2022-10-14

It Never Entered My Mind
type: MusicAlbum
date published: 2022-11-15
track: It Never Entered My Mind
  type: MusicRecording
  duration: PT5M22S
  duration ms: 322246
  explicit: false
  by artist: Gerard Kleijn
  in album: It Never Entered My Mind
    type: MusicAlbum
    date published: 2022-11-15
  isrc code: QZTB52278056
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-03T21:05:37+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xb4f821dc2d9b4cce9aaa663fcd9942b49e3534b081549b02ffc3a599fddb7490
  additional property: OTSHash
  additional property: OTSBitcoinBlock
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    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/QZTB52278056
  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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f821dc2d9b4cce9aaa663fcd9942b49e3534b081549b02ffc3a599fddb7490. 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/QZTB52278056.
    date published: 2026-07-04T10:04:33Z
  audio: It Never Entered My Mind
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 71.961
    additional property: Musical Key
      type: PropertyValue
      value: 5
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 4
    additional property: Danceability
      type: PropertyValue
      value: 0.331
    additional property: Energy
      type: PropertyValue
      value: 0.036
    additional property: Speechiness
      type: PropertyValue
      value: 0.034
    additional property: Acousticness
      type: PropertyValue
      value: 0.989
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.885
    additional property: Liveness
      type: PropertyValue
      value: 0.072
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.068
    additional property: Loudness (dB)
      type: PropertyValue
      value: -18.517
    additional property: Key Name
      type: PropertyValue
      value: F
    additional property: Mode Name
      type: PropertyValue
      value: Major

The Christmas Song
type: MusicAlbum
date published: 2022-12-21

Answer Me (Mütterlein)
type: MusicAlbum
date published: 2023-04-08

I Get Along Without You Very Well
type: MusicAlbum
date published: 2023-04-14

Noël Noël (French - English Carol)
type: MusicAlbum
date published: 2023-12-15

Sing We Now Of Christmas
type: MusicAlbum
date published: 2024-06-22

Radio Days
type: MusicAlbum
date published: 2024-09-07

Sleep My Love Sleep
type: MusicAlbum
date published: 2024-09-20

Gaga Smiles
type: MusicAlbum
date published: 2025-03-19

Birds On A Wire
type: MusicAlbum
date published: 2025-04-29

Angels From The Realms Of Glory
type: MusicAlbum
date published: 2025-11-09