Nana Okada
type: MusicGroup
genre: city pop
genre: enka
genre: kayokyoku
description: is a Japanese singer-songwriter and actor. She is a former member of the girl groups AKB48 and STU48. She was a fixture on AKB48's major single lineups from 2016 to 2022 and is considered one of the
popularity: 6
followers: 298
additional property: CopyrightID
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
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  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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b63ea171605e50c36751e65e7464b97e279fb5c8e3b0650ebb95982a45e0d3. Chain 2 (Bitcoin): anchored in block 954048 (2026-06-17T05:00:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4120adce-7164-4dd6-8908-4e0f6353100e.json and https://artists.proofprofile.net/proofs/artist/4120adce-7164-4dd6-8908-4e0f6353100e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T05:00:13Z
  text: {"copyright_id":"0x33b63ea171605e50c36751e65e7464b97e279fb5c8e3b0650ebb95982a45e0d3","name":"Nana Okada","registered_at":"2026-06-16T12:31:55Z","symbol":"NIM1052889","token_address":"0xece28513c742d27f12c07dddd53efedcee247642","type":"artist","uuid":"4120adce-7164-4dd6-8908-4e0f6353100e"}
album: Nana no Hitorigoto
  type: MusicAlbum
  date published: 1975
album: Akogare
  type: MusicAlbum
  date published: 1975
album: Seventeen! NANA Birthday Concert
  type: MusicAlbum
  date published: 1976
album: Akushu Shiyo yo
  type: MusicAlbum
  date published: 1976
  track: Seishun no Sakamichi
    type: MusicRecording
    duration: PT3M45S
    duration ms: 225648
    explicit: false
    by artist: Nana Okada
    in album: Akushu Shiyo yo
      type: MusicAlbum
      date published: 1976
    genre: city pop
    genre: enka
    genre: kayokyoku
    isrc code: JPPC07601330
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    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-18T14:29:03Z
    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
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
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      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47f3d30a1f83f1867a63d82f10dd0acac7896ef2494f4b126351fbce6da2094e. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/JPPC07601330.
      date published: 2026-07-18T14:29:03Z
    audio: Seishun no Sakamichi
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 118.98
      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: 0.636
      additional property: Energy
        type: PropertyValue
        value: 0.49
      additional property: Speechiness
        type: PropertyValue
        value: 0.032
      additional property: Acousticness
        type: PropertyValue
        value: 0.622
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.144
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.666
      additional property: Loudness (dB)
        type: PropertyValue
        value: -8.061
      additional property: Key Name
        type: PropertyValue
        value: A
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: Cream Soda
  type: MusicAlbum
  date published: 1977
album: '77 Atarashii Nikkicho
  type: MusicAlbum
  date published: 1977
album: Bye Bye Lullaby / Ai no Finale
  type: MusicAlbum
  date published: 1978
album: Mr. Arranger
  type: MusicAlbum
  date published: 1978
album: Nana Okada Singles Complete
  type: MusicAlbum
  date published: 2007
album: Saka no Tochuu de
  type: MusicAlbum
  date published: 2019-03-22