Keffa
type: MusicGroup
album: Niet meer terug
  type: MusicAlbum
  date published: 2023-11-03
album: Weersvoorspelling
  type: MusicAlbum
  date published: 2023-04-07
album: Mama hoor je mij
  type: MusicAlbum
  date published: 2023-03-06
  track: Mama hoor je mij
    type: MusicRecording
    duration: PT2M56S
    duration ms: 176000
    explicit: false
    by artist: Keffa
    in album: Mama hoor je mij
      type: MusicAlbum
      date published: 2023-03-06
    isrc code: SE5752347825
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-30T22:22:58+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x2cbf5cc0dea41e754559fbee0b6301061584fa6d05204fbc082c38a79649a581
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 960327
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/960327
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE5752347825
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-31T00:26:26Z
    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 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 0x2cbf5cc0dea41e754559fbee0b6301061584fa6d05204fbc082c38a79649a581. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE5752347825 — a six-check JSON result.
      date published: 2026-07-31T00:26:26Z
    audio: Mama hoor je mij
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 111.288
      additional property: Musical Key
        type: PropertyValue
        value: 10
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 5
      additional property: Danceability
        type: PropertyValue
        value: 0.707
      additional property: Energy
        type: PropertyValue
        value: 0.401
      additional property: Speechiness
        type: PropertyValue
        value: 0.306
      additional property: Acousticness
        type: PropertyValue
        value: 0.33
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.177
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.563
      additional property: Loudness (dB)
        type: PropertyValue
        value: -11.062
      additional property: Key Name
        type: PropertyValue
        value: Bb
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: Nieuwe jacka
  type: MusicAlbum
  date published: 2022-12-31
  track: Nieuwe jacka
    type: MusicRecording
    duration: PT2M10S
    duration ms: 130481
    explicit: false
    by artist: Keffa
    in album: Nieuwe jacka
      type: MusicAlbum
      date published: 2022-12-31
    isrc code: SE6XW2226175
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-30T07:03:24+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xf9b76d139d42b2ca936f9cb8aa3df4709940f05bd380d94836e89487d1782f22
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 960220
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/960220
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE6XW2226175
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-30T07:28:30Z
    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 0xf9b76d139d42b2ca936f9cb8aa3df4709940f05bd380d94836e89487d1782f22. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE6XW2226175 — a six-check JSON result.
      date published: 2026-07-30T07:28:30Z
    audio: Nieuwe jacka
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 115.387
      additional property: Musical Key
        type: PropertyValue
        value: 4
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 5
      additional property: Danceability
        type: PropertyValue
        value: 0.718
      additional property: Energy
        type: PropertyValue
        value: 0.601
      additional property: Speechiness
        type: PropertyValue
        value: 0.237
      additional property: Acousticness
        type: PropertyValue
        value: 0.071
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.234
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.417
      additional property: Loudness (dB)
        type: PropertyValue
        value: -10.587
      additional property: Key Name
        type: PropertyValue
        value: E
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: Paar doezoe
  type: MusicAlbum
  date published: 2022-11-01
  track: Paar doezoe
    type: MusicRecording
    duration: PT3M20S
    duration ms: 200489
    explicit: false
    by artist: Keffa
    in album: Paar doezoe
      type: MusicAlbum
      date published: 2022-11-01
    isrc code: SE62M2210777
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-07T20:58:15+00:00
    additional property: CopyrightChainExplorerURL
    additional property: OTSHash
    additional property: OTSBitcoinBlock
    additional property: OTSBitcoinBlockVerifyURL
    additional property: OTSVerificationAPI
    additional property: OTSTimestamp
    additional property: OTSVerifyInstructions
    subject of: OpenTimestamps Proof of Existence
    audio: Paar doezoe
album: In De Regen
album: Dat Is Leven
album: De Weg Kwijt
album: Wacht Op Mij

CopyrightChainExplorerURL
type: PropertyValue
value: https://explorer.copyrightchains.com/tx/0x54f8f43600936d9275ccd86d9d9e3079ff1e1e9044b06b42fba073a76a66b761

OTSHash
type: PropertyValue

OTSBitcoinBlock
type: PropertyValue
value: 957120

OTSBitcoinBlockVerifyURL
type: PropertyValue
value: https://blockstream.info/api/block-height/957120

OTSVerificationAPI
type: PropertyValue
value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE62M2210777

OTSTimestamp
type: PropertyValue
value: 2026-07-08T03:22:41Z

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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f8f43600936d9275ccd86d9d9e3079ff1e1e9044b06b42fba073a76a66b761. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE62M2210777 — a six-check JSON result.
date published: 2026-07-08T03:22:41Z

Paar doezoe
type: AudioObject
additional property: Tempo (BPM)
  type: PropertyValue
  value: 115.929
additional property: Musical Key
  type: PropertyValue
  value: 8
additional property: Mode (Major/Minor)
  type: PropertyValue
  value: 1
additional property: Time Signature
  type: PropertyValue
  value: 5
additional property: Danceability
  type: PropertyValue
  value: 0.838
additional property: Energy
  type: PropertyValue
  value: 0.563
additional property: Speechiness
  type: PropertyValue
  value: 0.231
additional property: Acousticness
  type: PropertyValue
  value: 0.043
additional property: Instrumentalness
  type: PropertyValue
  value: 0
additional property: Liveness
  type: PropertyValue
  value: 0.143
additional property: Valence (Positivity)
  type: PropertyValue
  value: 0.365
additional property: Loudness (dB)
  type: PropertyValue
  value: -10.661
additional property: Key Name
  type: PropertyValue
  value: Ab
additional property: Mode Name
  type: PropertyValue
  value: Major

In De Regen
type: MusicAlbum
date published: 2022-08-20

Dat Is Leven
type: MusicAlbum
date published: 2022-06-21

De Weg Kwijt
type: MusicAlbum
date published: 2022-04-09

Wacht Op Mij
type: MusicAlbum
date published: 2022-03-08