Yamada Sisters
type: MusicGroup
genre: enka
genre: kayokyoku
popularity: 7
followers: 337
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xf94f0cd1561c8d60d3da10374ff12c1ccfcf3e76c96f9440c78c37958898dc58
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954587
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954587
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/b9c3dd34-b611-4168-bdc2-42b6b6311b1e.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/b9c3dd34-b611-4168-bdc2-42b6b6311b1e.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/b9c3dd34-b611-4168-bdc2-42b6b6311b1e
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T19:10:41Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xf94f0cd1561c8d60d3da10374ff12c1ccfcf3e76c96f9440c78c37958898dc58","name":"Yamada Sisters","registered_at":"2026-06-20T16:25:34Z","symbol":"NIM1654385","token_address":"0x7bc4dcbd7890b639ac9c137eb2ed4066dc98c34e","type":"artist","uuid":"b9c3dd34-b611-4168-bdc2-42b6b6311b1e"}
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf94f0cd1561c8d60d3da10374ff12c1ccfcf3e76c96f9440c78c37958898dc58. Chain 2 (Bitcoin): anchored in block 954588 (2026-06-20T19:15:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b9c3dd34-b611-4168-bdc2-42b6b6311b1e.json and https://artists.proofprofile.net/proofs/artist/b9c3dd34-b611-4168-bdc2-42b6b6311b1e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T19:15:05Z
  text: {"copyright_id":"0xf94f0cd1561c8d60d3da10374ff12c1ccfcf3e76c96f9440c78c37958898dc58","name":"Yamada Sisters","registered_at":"2026-06-20T16:25:34Z","symbol":"NIM1654385","token_address":"0x7bc4dcbd7890b639ac9c137eb2ed4066dc98c34e","type":"artist","uuid":"b9c3dd34-b611-4168-bdc2-42b6b6311b1e"}
album: Anata - Yomigaeru Seishun No Melody -
  type: MusicAlbum
  date published: 2017-02-22
album: あなた 〜よみがえる青春のメロディー
  type: MusicAlbum
  date published: 2017-02-22
album: ふたつでひとつ 〜心を繋ぐ、歌を継ぐ
  type: MusicAlbum
  date published: 2018-03-07
album: 故郷 日本の愛唱歌 I
  type: MusicAlbum
  date published: 2018-09-26
  track: 花
    type: MusicRecording
    duration: PT2M9S
    duration ms: 129520
    explicit: false
    by artist: Yamada Sisters
    in album: 故郷 日本の愛唱歌 I
      type: MusicAlbum
      date published: 2018-09-26
    genre: enka
    genre: kayokyoku
    isrc code: JPCO01822720
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-17T23:34:38+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xf7817e8392b8e7576e3d2ff25464eabd414aa8e6ac4049e6cb8c811d2ea8941e
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958468
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958468
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01822720
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-18T00:27:51Z
    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
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7817e8392b8e7576e3d2ff25464eabd414aa8e6ac4049e6cb8c811d2ea8941e. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/JPCO01822720.
      date published: 2026-07-18T00:27:51Z
    audio: 花
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 127.528
      additional property: Musical Key
        type: PropertyValue
        value: 9
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.347
      additional property: Energy
        type: PropertyValue
        value: 0.118
      additional property: Speechiness
        type: PropertyValue
        value: 0.043
      additional property: Acousticness
        type: PropertyValue
        value: 0.993
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.001
      additional property: Liveness
        type: PropertyValue
        value: 0.11
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.261
      additional property: Loudness (dB)
        type: PropertyValue
        value: -15.154
      additional property: Key Name
        type: PropertyValue
        value: A
      additional property: Mode Name
        type: PropertyValue
        value: Major
  track: 花の街
    type: MusicRecording
    duration: PT2M43S
    duration ms: 163400
    explicit: false
    by artist: Yamada Sisters
    in album: 故郷 日本の愛唱歌 I
      type: MusicAlbum
      date published: 2018-09-26
    genre: enka
    genre: kayokyoku
    isrc code: JPCO01822730
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-17T06:50:11+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x00df8a334d825d1d16b5229fdc4ad40b85b5b61d8cb46cdbfe47a7e4a335ba94
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958388
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958388
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01822730
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-17T09:14:21Z
    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
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00df8a334d825d1d16b5229fdc4ad40b85b5b61d8cb46cdbfe47a7e4a335ba94. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/JPCO01822730.
      date published: 2026-07-17T09:14:21Z
    audio: 花の街
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 70.243
      additional property: Musical Key
        type: PropertyValue
        value: 5
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.3
      additional property: Energy
        type: PropertyValue
        value: 0.1
      additional property: Speechiness
        type: PropertyValue
        value: 0.044
      additional property: Acousticness
      additional property: Instrumentalness
      additional property: Liveness
      additional property: Valence (Positivity)
      additional property: Loudness (dB)
      additional property: Key Name
      additional property: Mode Name
  track: ちいさい秋みつけた

Acousticness
type: PropertyValue
value: 0.99

Instrumentalness
type: PropertyValue
value: 0

Liveness
type: PropertyValue
value: 0.104

Valence (Positivity)
type: PropertyValue
value: 0.105

Loudness (dB)
type: PropertyValue
value: -18.426

Key Name
type: PropertyValue
value: F

Mode Name
type: PropertyValue
value: Major

ちいさい秋みつけた
type: MusicRecording
duration: PT2M55S
duration ms: 175520
explicit: false
by artist: Yamada Sisters
in album: 故郷 日本の愛唱歌 I
  type: MusicAlbum
  date published: 2018-09-26
genre: enka
genre: kayokyoku
isrc code: JPCO01822670
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-04T20:09:25+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x37f6179855aad55edefb5b0bd8232defa28f92ebfeb16fcf3c74ed1ecc1fb455
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 956725
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/956725
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01822670
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-05T01:12:41Z
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
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37f6179855aad55edefb5b0bd8232defa28f92ebfeb16fcf3c74ed1ecc1fb455. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO01822670.
  date published: 2026-07-05T01:12:41Z
audio: ちいさい秋みつけた
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 70.877
  additional property: Musical Key
    type: PropertyValue
    value: 4
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 4
  additional property: Danceability
    type: PropertyValue
    value: 0.321
  additional property: Energy
    type: PropertyValue
    value: 0.093
  additional property: Speechiness
    type: PropertyValue
    value: 0.063
  additional property: Acousticness
    type: PropertyValue
    value: 0.988
  additional property: Instrumentalness
    type: PropertyValue
    value: 0
  additional property: Liveness
    type: PropertyValue
    value: 0.151
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.314
  additional property: Loudness (dB)
    type: PropertyValue
    value: -18.965
  additional property: Key Name
    type: PropertyValue
    value: E
  additional property: Mode Name
    type: PropertyValue
    value: Minor