Esther Borja
type: MusicGroup
genre: bolero
description: thumb|Esther Borja by Annemarie Heinrich, 1937 Esther Borja Lima (5 December 1913 – 28 December 2013)Given by Orovio (Orovio, Helio 1982. Diccionario de la música cubana. La Habana) as: 5 September 1
popularity: 3
followers: 491
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSRecordURL
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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 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 0xca79256668d7199791c96caa1ef735e9d7e097b507e90c87eb66cc870483ab08. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f6ea652c-919b-4f3c-a66f-223cede374fc.json and https://artists.proofprofile.net/proofs/artist/f6ea652c-919b-4f3c-a66f-223cede374fc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-22T02:53:59Z
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album: Rapsodia de Cuba
  type: MusicAlbum
  date published: 1956-01-01
album: Éxitos de Ernestina Lecuona
  type: MusicAlbum
  date published: 1956-01-01
album: Canta A Dos, Tres y Cuatro Voces
  type: MusicAlbum
  date published: 1957-05-21
album: Despertar / Dejame Estrechar Tu Mano
  type: MusicAlbum
  date published: 1961-01-01
album: Ayer y Hoy
  type: MusicAlbum
  date published: 1987-02-10
album: Rapsodia De Cuba
  type: MusicAlbum
  date published: 1995
album: Longina Danza Criolla y Canción Cubana
  type: MusicAlbum
  date published: 1998-07-01
album: Vintage Cuba No. 106 - EP: Rapsodia De Cuba
  type: MusicAlbum
  date published: 2010-11-05
album: Estrellas de Cuba: Esther Borja, Vol. 1
  type: MusicAlbum
  date published: 2014-02-11
album: En Sus Cien Anos, Vol. 3
  type: MusicAlbum
  date published: 2014-03-25
album: En Sus Cien Anos, Vol. 2
  type: MusicAlbum
  date published: 2014-03-25
album: En Sus Cien Anos, Vol. 1
  type: MusicAlbum
  date published: 2014-03-25
album: Siboney
  type: MusicAlbum
  date published: 2014-09-17
album: El Manisero
  type: MusicAlbum
  date published: 2014-10-04
album: Rapsodia de Cuba
  type: MusicAlbum
  date published: 2015-01-01
  track: Siboney
    type: MusicRecording
    duration: PT3M18S
    duration ms: 198791
    explicit: false
    by artist: Esther Borja
    in album: Rapsodia de Cuba
      type: MusicAlbum
      date published: 2015-01-01
    genre: bolero
    isrc code: QM6N21588385
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    additional property: CopyrightStatus
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    additional property: OTSVerificationAPI
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    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-08T03:20:19Z
    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 0xb7da423d2db3eca3dcb0d85ab72d123db9c5add28804228019c6949f05a5f219. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM6N21588385.
      date published: 2026-07-08T03:20:19Z
    audio: Siboney
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 126.563
      additional property: Musical Key
        type: PropertyValue
        value: 10
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 5
      additional property: Danceability
        type: PropertyValue
        value: 0.305
      additional property: Energy
        type: PropertyValue
        value: 0.308
      additional property: Speechiness
        type: PropertyValue
        value: 0.034
      additional property: Acousticness
        type: PropertyValue
        value: 0.982
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.005
      additional property: Liveness
        type: PropertyValue
        value: 0.114
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.183
      additional property: Loudness (dB)
        type: PropertyValue
        value: -13.549
      additional property: Key Name
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        value: Bb
      additional property: Mode Name
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        value: Minor
album: Interpreta a Ernesto Lecuona
  type: MusicAlbum
  date published: 2015-05-22
album: Canta a Ernestina Lecuona
  type: MusicAlbum
  date published: 2015-09-18
album: Ausencia
  type: MusicAlbum
  date published: 2016-03-12
album: Mi album de Cuba
  type: MusicAlbum
  date published: 2016-10-21
album: Canciones inolvidables de Ernestina Lecuona (Remastered)
  type: MusicAlbum
  date published: 2016-10-21
album: Esther Borja interpreta a Ernesto Lecuona (Remasterizado)
  type: MusicAlbum
  date published: 2018-02-22
track: Ausencia
  type: MusicRecording
  duration: PT4M11S
  duration ms: 251653
  explicit: false
  by artist: Esther Borja
  in album: Boleros Cubanos De Oro, Vol. 1
    type: MusicAlbum
    date published: 2014-10-08
  isrc code: USV351428750
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  subject of: OpenTimestamps Proof of Existence
  audio: Ausencia

CopyrightRegisteredAt
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CopyrightChainExplorerURL
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value: https://explorer.copyrightchains.com/tx/0xd0b01f95dfeacea458cf0011d193d15f67750d502348de9bbd826ed9df145d41

OTSHash
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OTSBitcoinBlock
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OTSBitcoinBlockVerifyURL
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value: https://blockstream.info/api/block-height/960203

OTSVerificationAPI
type: PropertyValue
value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USV351428750

OTSTimestamp
type: PropertyValue
value: 2026-07-30T03:35:13Z

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

OpenTimestamps Proof of Existence
type: DigitalDocument
encoding format: application/vnd.opentimestamps.ots
description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b01f95dfeacea458cf0011d193d15f67750d502348de9bbd826ed9df145d41. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USV351428750.
date published: 2026-07-30T03:35:13Z

Ausencia
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additional property: Tempo (BPM)
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additional property: Mode (Major/Minor)
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additional property: Time Signature
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additional property: Danceability
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additional property: Energy
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additional property: Speechiness
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additional property: Acousticness
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additional property: Instrumentalness
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additional property: Liveness
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additional property: Valence (Positivity)
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  value: 0.267
additional property: Loudness (dB)
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