Opk
type: MusicGroup
description: OPK may refer to: Oak Park railway station, Melbourne, Australia (Metro Trains station code) Olli-Pekka Kallasvuo, former CEO of Nokia Ovulation prediction kit United Instrument Manufacturing Corpora
popularity: 14
followers: 472
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x16c5f47ff8f0d9766f54ef02dc622c1bc77f592814f6faffded7eea6586b7934
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953780
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953780
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d45d147b-152d-4a4a-92f3-bb1b3fed602e.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/d45d147b-152d-4a4a-92f3-bb1b3fed602e.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/d45d147b-152d-4a4a-92f3-bb1b3fed602e
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T12:02:32Z
additional property: OTSCanonicalRecord
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 0x16c5f47ff8f0d9766f54ef02dc622c1bc77f592814f6faffded7eea6586b7934. Chain 2 (Bitcoin): anchored in block 953780 (2026-06-15T12:02:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d45d147b-152d-4a4a-92f3-bb1b3fed602e.json and https://artists.proofprofile.net/proofs/artist/d45d147b-152d-4a4a-92f3-bb1b3fed602e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T12:02:32Z
album: Imagine (Acoustic without drums)
  type: MusicAlbum
  date published: 2024-02-13
album: Imagine
  type: MusicAlbum
  date published: 2024-02-13
album: Imagine
  type: MusicAlbum
  date published: 2024-02-13
album: Imagine
  type: MusicAlbum
  date published: 2024-02-13
album: Wonderland
  type: MusicAlbum
  date published: 2024-03-05
album: Wonderland
  type: MusicAlbum
  date published: 2024-03-05
album: Wonderland
  type: MusicAlbum
  date published: 2024-03-05
album: ButiFly
  type: MusicAlbum
  date published: 2024-04-18
album: This Thing Between Us
  type: MusicAlbum
  date published: 2024-05-17
album: This Thing Between Us
  type: MusicAlbum
  date published: 2024-05-17
album: This Thing Between Us
  type: MusicAlbum
  date published: 2024-05-17
album: Surlfa
  type: MusicAlbum
  date published: 2024-05-31
album: Moments
  type: MusicAlbum
  date published: 2024-06-07
album: World to the Joy
  type: MusicAlbum
  date published: 2024-11-29
album: World to the Joy
  type: MusicAlbum
  date published: 2024-11-29
album: World To The Joy
  type: MusicAlbum
  date published: 2024-11-29
album: Walk With Me
  type: MusicAlbum
  date published: 2025-03-13
  track: Walk With Me
    type: MusicRecording
    duration: PT1M42S
    duration ms: 102240
    explicit: false
    by artist: Opk
    in album: Walk With Me
      type: MusicAlbum
      date published: 2025-03-13
    isrc code: US3DF2506845
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-21T19:22:26+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xc422f9c25488a4a441dd339077dd3b2da73a1e0a90e26b7eb87cc451ba76d0d5
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 959051
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/959051
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US3DF2506845
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-21T19:48:03Z
    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 0xc422f9c25488a4a441dd339077dd3b2da73a1e0a90e26b7eb87cc451ba76d0d5. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/US3DF2506845.
      date published: 2026-07-21T19:48:03Z
    audio: Walk With Me
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 120.067
      additional property: Musical Key
        type: PropertyValue
        value: 9
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.689
      additional property: Energy
        type: PropertyValue
        value: 0.106
      additional property: Speechiness
        type: PropertyValue
        value: 0.117
      additional property: Acousticness
        type: PropertyValue
        value: 0.976
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.935
      additional property: Liveness
        type: PropertyValue
        value: 0.095
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.506
      additional property: Loudness (dB)
        type: PropertyValue
        value: -23.396
      additional property: Key Name
        type: PropertyValue
        value: A
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: feels warm enough
  type: MusicAlbum
  date published: 2025-07-18