Folkert Hofstra
type: MusicGroup
popularity: 3
followers: 133
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x2f6b22407aab07a3b522736fec72ddcbb2e0e241c054776ef11c9bbaa10abc55
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954342
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954342
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/878e86bc-1570-4f5d-8116-0049fe4c7feb.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/878e86bc-1570-4f5d-8116-0049fe4c7feb.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/878e86bc-1570-4f5d-8116-0049fe4c7feb
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-19T03:22:39Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x2f6b22407aab07a3b522736fec72ddcbb2e0e241c054776ef11c9bbaa10abc55","name":"Folkert Hofstra","registered_at":"2026-06-17T12:59:10Z","symbol":"NIM1402821","token_address":"0x1653bdb9401b070ab05e1222a0a2cbd13279529e","type":"artist","uuid":"878e86bc-1570-4f5d-8116-0049fe4c7feb"}
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 0x2f6b22407aab07a3b522736fec72ddcbb2e0e241c054776ef11c9bbaa10abc55. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/878e86bc-1570-4f5d-8116-0049fe4c7feb.json and https://artists.proofprofile.net/proofs/artist/878e86bc-1570-4f5d-8116-0049fe4c7feb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-19T03:22:39Z
  text: {"copyright_id":"0x2f6b22407aab07a3b522736fec72ddcbb2e0e241c054776ef11c9bbaa10abc55","name":"Folkert Hofstra","registered_at":"2026-06-17T12:59:10Z","symbol":"NIM1402821","token_address":"0x1653bdb9401b070ab05e1222a0a2cbd13279529e","type":"artist","uuid":"878e86bc-1570-4f5d-8116-0049fe4c7feb"}
album: Autumn Temperature
  type: MusicAlbum
  date published: 2017-12-12
album: Lucid Dream
  type: MusicAlbum
  date published: 2018-04-20
album: De Klim
  type: MusicAlbum
  date published: 2018-10-23
  track: De Klim
    type: MusicRecording
    duration: PT4M36S
    duration ms: 276000
    explicit: false
    by artist: Folkert Hofstra
    in album: De Klim
      type: MusicAlbum
      date published: 2018-10-23
    isrc code: QZES51886476
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-22T05:17:32+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x725637abddc81d2703fdd83a12c5d9a36bbffdc35ca3f209bbef75739986de18
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 959103
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/959103
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZES51886476
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-22T05:56:21Z
    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 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 0x725637abddc81d2703fdd83a12c5d9a36bbffdc35ca3f209bbef75739986de18. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZES51886476.
      date published: 2026-07-22T05:56:21Z
    audio: De Klim
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 128.186
      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: 0.37
      additional property: Energy
        type: PropertyValue
        value: 0.053
      additional property: Speechiness
        type: PropertyValue
        value: 0.038
      additional property: Acousticness
        type: PropertyValue
        value: 0.995
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.924
      additional property: Liveness
        type: PropertyValue
        value: 0.073
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.219
      additional property: Loudness (dB)
        type: PropertyValue
        value: -29.389
      additional property: Key Name
        type: PropertyValue
        value: C
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: Fisk
  type: MusicAlbum
  date published: 2019-09-12
album: Rediscover
  type: MusicAlbum
  date published: 2022-05-20
album: Feeling The Other Side Of The World
  type: MusicAlbum
  date published: 2022-09-09
album: Particles
  type: MusicAlbum
  date published: 2025-01-31
album: Winteresque
  type: MusicAlbum
  date published: 2025-02-14
album: Winteresque (remastered)
  type: MusicAlbum
  date published: 2025-05-31