Keiko Maruyama
type: MusicGroup
genre: city pop
genre: enka
genre: kayokyoku
popularity: 20
followers: 5187
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additional property: OTSVerificationAPI
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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
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbedd3ee7ade0ce80e043d42ad35d3673b14b5c60f28dd8adb90a1a01300351d6. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/92a5cbf4-069c-4865-b30d-b2f683b2ebe8.json and https://artists.proofprofile.net/proofs/artist/92a5cbf4-069c-4865-b30d-b2f683b2ebe8.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-15T04:47:56Z
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album: そっと私は
  type: MusicAlbum
  date published: 1972
album: Sotto Watashiwa
  type: MusicAlbum
  date published: 1972-11-25
album: そっと私は
  type: MusicAlbum
  date published: 1972-11-25
album: 黄昏めもりい
  type: MusicAlbum
  date published: 1976-03-05
album: 春しぐれ
  type: MusicAlbum
  date published: 1977-03-05
  track: あなたにつつまれて
    type: MusicRecording
    duration: PT3M42S
    duration ms: 222440
    explicit: false
    by artist: Keiko Maruyama
    in album: 春しぐれ
      type: MusicAlbum
      date published: 1977-03-05
    genre: city pop
    genre: enka
    genre: kayokyoku
    isrc code: JPKI07765263
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    additional property: OTSVerificationAPI
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    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-22T14:10:55Z
    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 0xd1dc694838c4bac0c5845aaf47bf9bae00381ac81bcf365026164cd32d4390b8. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T14:10:55Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPKI07765263 — a six-check JSON result.
      date published: 2026-07-22T14:10:55Z
    audio: あなたにつつまれて
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 143.219
      additional property: Musical Key
        type: PropertyValue
        value: 0
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.442
      additional property: Energy
        type: PropertyValue
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      additional property: Speechiness
        type: PropertyValue
        value: 0.027
      additional property: Acousticness
        type: PropertyValue
        value: 0.929
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.002
      additional property: Liveness
        type: PropertyValue
        value: 0.133
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.435
      additional property: Loudness (dB)
        type: PropertyValue
        value: -5.476
      additional property: Key Name
        type: PropertyValue
        value: C
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: MY POINT OF VIEW
  type: MusicAlbum
  date published: 1977-12-05
album: 裸足で誘って
  type: MusicAlbum
  date published: 1978-06-21
album: KEIKO～丸山圭子ベスト・アルバム
  type: MusicAlbum
  date published: 1978-11-05
  track: どうぞこのまま
    type: MusicRecording
    duration: PT3M36S
    duration ms: 216226
    explicit: false
    by artist: Keiko Maruyama
    in album: KEIKO～丸山圭子ベスト・アルバム
      type: MusicAlbum
      date published: 1978-11-05
    genre: city pop
    genre: enka
    genre: kayokyoku
    isrc code: JPKI07561980
    additional property: CopyrightID
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      type: PropertyValue
      value: registered
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    additional property: OTSVerificationAPI
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    additional property: OTSTimestamp
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    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 0x29278d03b8018482101cf9fe06f71680dc9f7619c6d5534016d485c1d8d3a1b8. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPKI07561980 — a six-check JSON result.
      date published: 2026-07-04T10:04:33Z
    audio: どうぞこのまま
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 125.714
      additional property: Musical Key
        type: PropertyValue
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      additional property: Mode (Major/Minor)
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      additional property: Danceability
      additional property: Energy
      additional property: Speechiness
      additional property: Acousticness
      additional property: Instrumentalness
      additional property: Liveness
      additional property: Valence (Positivity)
      additional property: Loudness (dB)
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album: Inside My Love
album: ダンスはうまく踊れない
album: 夢で逢えたら
album: どうぞこのまま
album: Ｍｒ．サマータイム
album: あの日にかえりたい
album: 傍らの愛
album: Katawara No Ai
album: レトロモダン～誘い
album: MISS LONELY
album: MORE 愛+1(2021 REMASTER)
album: MORE Ai+1(2021 REMASTER)
album: On Your Side~Piano Love Songs
album: 彩色兼美
album: Saishokukenbi

Mode (Major/Minor)
type: PropertyValue
value: 0

Time Signature
type: PropertyValue
value: 4

Danceability
type: PropertyValue
value: 0.6

Energy
type: PropertyValue
value: 0.534

Speechiness
type: PropertyValue
value: 0.029

Acousticness
type: PropertyValue
value: 0.31

Instrumentalness
type: PropertyValue
value: 0.029

Liveness
type: PropertyValue
value: 0.087

Valence (Positivity)
type: PropertyValue
value: 0.711

Loudness (dB)
type: PropertyValue
value: -7.115

Key Name
type: PropertyValue
value: B

Mode Name
type: PropertyValue
value: Minor

Inside My Love
type: MusicAlbum
date published: 2009-02-18

ダンスはうまく踊れない
type: MusicAlbum
date published: 2014-01-29

夢で逢えたら
type: MusicAlbum
date published: 2014-01-29

どうぞこのまま
type: MusicAlbum
date published: 2014-01-29

Ｍｒ．サマータイム
type: MusicAlbum
date published: 2014-01-29

あの日にかえりたい
type: MusicAlbum
date published: 2014-01-29

傍らの愛
type: MusicAlbum
date published: 2015-09-02

傍らの愛
type: MusicAlbum
date published: 2015-09-02

Katawara No Ai
type: MusicAlbum
date published: 2015-10-28

レトロモダン～誘い
type: MusicAlbum
date published: 2018-02-21

レトロモダン～誘い
type: MusicAlbum
date published: 2018-02-21
track: どうぞこのまま
  type: MusicRecording
  duration: PT4M0S
  duration ms: 240333
  explicit: false
  by artist: Keiko Maruyama
  in album: レトロモダン～誘い
    type: MusicAlbum
    date published: 2018-02-21
  genre: city pop
  genre: enka
  genre: kayokyoku
  isrc code: JPJ901800100
  additional property: CopyrightID
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    type: PropertyValue
    value: registered
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    value: 2026-07-20T22:06:05+00:00
  additional property: CopyrightChainExplorerURL
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    value: https://explorer.copyrightchains.com/tx/0xbe5ce5fa9b6a39865c43f010f3e84a1c0a2744d2141235a5376dd8460181ca77
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  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPJ901800100
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-21T00:24:07Z
  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 0xbe5ce5fa9b6a39865c43f010f3e84a1c0a2744d2141235a5376dd8460181ca77. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPJ901800100 — a six-check JSON result.
    date published: 2026-07-21T00:24:07Z
  audio: どうぞこのまま
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 114.879
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      type: PropertyValue
      value: 10
    additional property: Mode (Major/Minor)
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      value: 0
    additional property: Time Signature
      type: PropertyValue
      value: 4
    additional property: Danceability
      type: PropertyValue
      value: 0.442
    additional property: Energy
      type: PropertyValue
      value: 0.196
    additional property: Speechiness
      type: PropertyValue
      value: 0.033
    additional property: Acousticness
      type: PropertyValue
      value: 0.928
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.03
    additional property: Liveness
      type: PropertyValue
      value: 0.115
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.224
    additional property: Loudness (dB)
      type: PropertyValue
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    additional property: Key Name
      type: PropertyValue
      value: Bb
    additional property: Mode Name
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MISS LONELY
type: MusicAlbum
date published: 2021-06-23

MISS LONELY
type: MusicAlbum
date published: 2021-06-23

MORE 愛+1(2021 REMASTER)
type: MusicAlbum
date published: 2021-10-20

MORE Ai+1(2021 REMASTER)
type: MusicAlbum
date published: 2021-10-20

On Your Side~Piano Love Songs
type: MusicAlbum
date published: 2022-09-25

黄昏めもりい
type: MusicAlbum
date published: 2022-11-30

裸足で誘って
type: MusicAlbum
date published: 2022-11-30

彩色兼美
type: MusicAlbum
date published: 2025-10-25

Saishokukenbi
type: MusicAlbum
date published: 2025-10-25