Marcia
type: MusicGroup
genre: enka
genre: kayokyoku
popularity: 19
followers: 1433
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xd027d8f397c06d22ca7a9b2640569f0270af6c1bf1cb61f4fd16a77217f8ec7f
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953741
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953741
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9c585daa-c06d-4298-8208-dbf4aefdb280.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/9c585daa-c06d-4298-8208-dbf4aefdb280.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/9c585daa-c06d-4298-8208-dbf4aefdb280
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-15T04:44:49Z
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd027d8f397c06d22ca7a9b2640569f0270af6c1bf1cb61f4fd16a77217f8ec7f. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9c585daa-c06d-4298-8208-dbf4aefdb280.json and https://artists.proofprofile.net/proofs/artist/9c585daa-c06d-4298-8208-dbf4aefdb280.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-15T09:50:11Z
album: ふりむけばヨコハマ
  type: MusicAlbum
  date published: 1989-01-21
  track: ふりむけばヨコハマ
    type: MusicRecording
    duration: PT4M11S
    duration ms: 251693
    explicit: false
    by artist: Marcia
    in album: ふりむけばヨコハマ
      type: MusicAlbum
      date published: 1989-01-21
    genre: enka
    genre: kayokyoku
    isrc code: JPCO08828190
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-05T22:30:22+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x3aefdd743bb13f185643450143cbae70ba5f4b441b8f1e390dd39df564175d81
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956857
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956857
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO08828190
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-06T01:26:17Z
    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 0x3aefdd743bb13f185643450143cbae70ba5f4b441b8f1e390dd39df564175d81. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/JPCO08828190.
      date published: 2026-07-06T01:26:17Z
    audio: ふりむけばヨコハマ
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 94.212
      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: 0.545
      additional property: Energy
        type: PropertyValue
        value: 0.369
      additional property: Speechiness
        type: PropertyValue
        value: 0.033
      additional property: Acousticness
        type: PropertyValue
        value: 0.515
      additional property: Instrumentalness
        type: PropertyValue
        value: 0
      additional property: Liveness
        type: PropertyValue
        value: 0.07
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.35
      additional property: Loudness (dB)
        type: PropertyValue
        value: -11.872
      additional property: Key Name
        type: PropertyValue
        value: D
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: ふりむけばヨコハマ（オリジナル・アルバム）
  type: MusicAlbum
  date published: 1989-02-21
album: 黄昏に抱かれて
  type: MusicAlbum
  date published: 1989-12-01
album: 抱きしめて
  type: MusicAlbum
  date published: 1990-02-14
album: 抱きしめて（オリジナル・アルバム）
  type: MusicAlbum
  date published: 1990-04-01
  track: 抱きしめて
    type: MusicRecording
    duration: PT4M40S
    duration ms: 280066
    explicit: false
    by artist: Marcia
    in album: 抱きしめて（オリジナル・アルバム）
      type: MusicAlbum
      date published: 1990-04-01
    genre: enka
    genre: kayokyoku
    isrc code: JPCO08963570
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-04T04:00:19+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x0461a0fef0c873bd185c18c95ce71c5901a47aa9c0b98669a672428bb4183da3
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 956639
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/956639
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPCO08963570
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-04T11:19:20Z
    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 0x0461a0fef0c873bd185c18c95ce71c5901a47aa9c0b98669a672428bb4183da3. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/JPCO08963570.
      date published: 2026-07-04T11:19:20Z
    audio: 抱きしめて
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 204.886
      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: 0.342
      additional property: Energy
        type: PropertyValue
        value: 0.477
      additional property: Speechiness
        type: PropertyValue
        value: 0.048
      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
album: Eu te amo〈エウ・テ・アモ〉
album: 待ちわびて哀愁
album: 恋人たちのララバイ
album: 愛を置き去りに
album: あなたの愛につつまれて
album: さよならが言えなくて
album: あきらめてバイバイ
album: 逢いに行きたい
album: 陽だまり
album: マルシア特選集 陽だまり
album: 愛・12色のシルエット
album: 灼熱（アモール）…サウダージ
album: 紅（あか）い蓮（ロータス）〜Chove Chuva〜
album: AMOR（アモール）…SAUDADE（サウダージ）〜VERSAO em PORTUGUES〜
album: しあわせになれる
album: ずっと 許してる
album: Days
album: 心の結婚／いつも あなたを想ってる
album: Just a Woman 〜あなたへ〜
album: Yours〜時のいたずら〜
album: エデンの雨／舞姫になれない
album: マルシア全曲集 舞姫になれない
album: マルシア全曲集 ふりむけばヨコハマ
album: マルシア ベスト・コレクション2016
album: ALEGRIA (アレグリア)
album: 真夜中のささやき Frase da Madrugada

Acousticness
type: PropertyValue
value: 0.224

Instrumentalness
type: PropertyValue
value: 0

Liveness
type: PropertyValue
value: 0.125

Valence (Positivity)
type: PropertyValue
value: 0.424

Loudness (dB)
type: PropertyValue
value: -10.534

Key Name
type: PropertyValue
value: E

Mode Name
type: PropertyValue
value: Minor

Eu te amo〈エウ・テ・アモ〉
type: MusicAlbum
date published: 1990-11-21

待ちわびて哀愁
type: MusicAlbum
date published: 1991-01-21

恋人たちのララバイ
type: MusicAlbum
date published: 1991-06-21

愛を置き去りに
type: MusicAlbum
date published: 1991-08-21

あなたの愛につつまれて
type: MusicAlbum
date published: 1992-02-21

さよならが言えなくて
type: MusicAlbum
date published: 1992-04-01

あきらめてバイバイ
type: MusicAlbum
date published: 1992-09-21

逢いに行きたい
type: MusicAlbum
date published: 1992-10-21

陽だまり
type: MusicAlbum
date published: 1993-03-21

マルシア特選集 陽だまり
type: MusicAlbum
date published: 1993-05-21

愛・12色のシルエット
type: MusicAlbum
date published: 1993-10-01

灼熱（アモール）…サウダージ
type: MusicAlbum
date published: 1994-06-21

紅（あか）い蓮（ロータス）〜Chove Chuva〜
type: MusicAlbum
date published: 1994-11-21

AMOR（アモール）…SAUDADE（サウダージ）〜VERSAO em PORTUGUES〜
type: MusicAlbum
date published: 1995-04-21

しあわせになれる
type: MusicAlbum
date published: 1995-09-01

ずっと 許してる
type: MusicAlbum
date published: 1996-03-20

Days
type: MusicAlbum
date published: 1996-06-21

心の結婚／いつも あなたを想ってる
type: MusicAlbum
date published: 1996-09-21

Just a Woman 〜あなたへ〜
type: MusicAlbum
date published: 1998-10-21

Yours〜時のいたずら〜
type: MusicAlbum
date published: 2008-10-22

エデンの雨／舞姫になれない
type: MusicAlbum
date published: 2009-10-21

マルシア全曲集 舞姫になれない
type: MusicAlbum
date published: 2011-11-23

マルシア全曲集 ふりむけばヨコハマ
type: MusicAlbum
date published: 2012-11-21

マルシア ベスト・コレクション2016
type: MusicAlbum
date published: 2016-03-30

ALEGRIA (アレグリア)
type: MusicAlbum
date published: 2019-08-28

真夜中のささやき Frase da Madrugada
type: MusicAlbum
date published: 2019-09-11