Kumiko Ohba
type: MusicGroup
genre: city pop
genre: kayokyoku
popularity: 11
followers: 1812
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x987b12fead9d326504ab59b748e62e3059d3fbb030e9809c6182b82ce730fb7c
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953772
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953772
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/c6626481-4ae2-4845-a805-4ac342fcb805.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/c6626481-4ae2-4845-a805-4ac342fcb805.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/c6626481-4ae2-4845-a805-4ac342fcb805
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T10:33:29Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x987b12fead9d326504ab59b748e62e3059d3fbb030e9809c6182b82ce730fb7c","name":"Kumiko Ohba","registered_at":"2026-06-15T01:18:22Z","symbol":"NIM0636714","token_address":"0xef72af67bcf71450e3634bdd3da91733b099b858","type":"artist","uuid":"c6626481-4ae2-4845-a805-4ac342fcb805"}
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 0x987b12fead9d326504ab59b748e62e3059d3fbb030e9809c6182b82ce730fb7c. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c6626481-4ae2-4845-a805-4ac342fcb805.json and https://artists.proofprofile.net/proofs/artist/c6626481-4ae2-4845-a805-4ac342fcb805.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T10:33:29Z
  text: {"copyright_id":"0x987b12fead9d326504ab59b748e62e3059d3fbb030e9809c6182b82ce730fb7c","name":"Kumiko Ohba","registered_at":"2026-06-15T01:18:22Z","symbol":"NIM0636714","token_address":"0xef72af67bcf71450e3634bdd3da91733b099b858","type":"artist","uuid":"c6626481-4ae2-4845-a805-4ac342fcb805"}
album: なんてったってアイドルポップ～あこがれ～
  type: MusicAlbum
  date published: 1993-06-30
  track: キラキラ星あげる
    type: MusicRecording
    duration: PT3M19S
    duration ms: 199860
    explicit: false
    by artist: Kumiko Ohba
    in album: なんてったってアイドルポップ～あこがれ～
      type: MusicAlbum
      date published: 1993-06-30
    genre: city pop
    genre: kayokyoku
    isrc code: JPTO09310940
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-18T12:53:42+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x02eb136f4c534b366d898a354ef552155b92b185dbc67385293c04c8202d36bc
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958552
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958552
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPTO09310940
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-18T13:15:29Z
    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 0x02eb136f4c534b366d898a354ef552155b92b185dbc67385293c04c8202d36bc. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/JPTO09310940.
      date published: 2026-07-18T13:15:29Z
    audio: キラキラ星あげる
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 151.001
      additional property: Musical Key
        type: PropertyValue
        value: 11
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.563
      additional property: Energy
        type: PropertyValue
        value: 0.507
      additional property: Speechiness
        type: PropertyValue
        value: 0.046
      additional property: Acousticness
        type: PropertyValue
        value: 0.687
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.189
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.496
      additional property: Loudness (dB)
        type: PropertyValue
        value: -11.085
      additional property: Key Name
        type: PropertyValue
        value: B
      additional property: Mode Name
        type: PropertyValue
        value: Minor
  track: スプリング・サンバ
    type: MusicRecording
    duration: PT3M10S
    duration ms: 190906
    explicit: false
    by artist: Kumiko Ohba
    in album: なんてったってアイドルポップ～あこがれ～
      type: MusicAlbum
      date published: 1993-06-30
    genre: city pop
    genre: kayokyoku
    isrc code: JPTO09310980
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-16T16:28:20+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x214ac9d8dc6321e708a182f609639b5972f2c86e80ffc8e3a73e23a86d6da2f6
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958373
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958373
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPTO09310980
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-17T06:09:33Z
    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 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 0x214ac9d8dc6321e708a182f609639b5972f2c86e80ffc8e3a73e23a86d6da2f6. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/JPTO09310980.
      date published: 2026-07-17T06:09:33Z
    audio: スプリング・サンバ
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 116.628
      additional property: Musical Key
        type: PropertyValue
        value: 2
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.762
      additional property: Energy
        type: PropertyValue
        value: 0.749
      additional property: Speechiness
        type: PropertyValue
        value: 0.072
      additional property: Acousticness
        type: PropertyValue
        value: 0.634
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.062
      additional property: Valence (Positivity)
      additional property: Loudness (dB)
      additional property: Key Name
      additional property: Mode Name
album: BIG ARTIST BEST COLLECTION 大場久美子
album: ゴールデン☆ベスト
track: スプリング・サンバ

Valence (Positivity)
type: PropertyValue
value: 0.564

Loudness (dB)
type: PropertyValue
value: -9.352

Key Name
type: PropertyValue
value: D

Mode Name
type: PropertyValue
value: Minor

BIG ARTIST BEST COLLECTION 大場久美子
type: MusicAlbum
date published: 1995-02-22

ゴールデン☆ベスト
type: MusicAlbum
date published: 2002-06-19

スプリング・サンバ
type: MusicRecording
duration: PT3M10S
duration ms: 190906
explicit: false
by artist: Kumiko Ohba
in album: City Pop Essentials - Idols -
  type: MusicAlbum
  date published: 2023-07-12
isrc code: JPTO09310980
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x214ac9d8dc6321e708a182f609639b5972f2c86e80ffc8e3a73e23a86d6da2f6
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960264
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960264
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPTO09310980
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T14:36:16Z
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 0x214ac9d8dc6321e708a182f609639b5972f2c86e80ffc8e3a73e23a86d6da2f6. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/JPTO09310980.
  date published: 2026-07-30T14:36:16Z
audio: スプリング・サンバ
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 129.312
  additional property: Musical Key
    type: PropertyValue
    value: 2
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.762
  additional property: Energy
    type: PropertyValue
    value: 0.749
  additional property: Speechiness
    type: PropertyValue
    value: 0.072
  additional property: Acousticness
    type: PropertyValue
    value: 0.634
  additional property: Instrumentalness
    type: PropertyValue
    value: 0
  additional property: Liveness
    type: PropertyValue
    value: 0.062
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.564
  additional property: Loudness (dB)
    type: PropertyValue
    value: -13.248
  additional property: Key Name
    type: PropertyValue
    value: D
  additional property: Mode Name
    type: PropertyValue
    value: Minor