Agustín Barboza
type: MusicGroup
genre: polka
description: Agustín Pío Barboza (5 May 1913 – 18 December 1998) was a Paraguayan singer and composer. Biography Childhood and youth Barboza was born in Asunción, Paraguay. While still an adolescent in 1929, he
popularity: 7
followers: 437
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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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  date published: 2026-06-17T08:11:48Z
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album: Vintage World No. 100 - EP: Ecos Sudamericanos
  type: MusicAlbum
  date published: 1959-11-23
album: Agustín Barboza
  type: MusicAlbum
  date published: 2019-11-06
album: Música Paraguaya
  type: MusicAlbum
  date published: 2022-03-18
album: Música Paraguaya
  type: MusicAlbum
  date published: 2022-03-18
track: Oda Pasional
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  by artist: Félix Pérez Cardozo
  by artist: Agustín Barboza
  in album: Los Mejores 25 Éxitos - Emiliano R. Fernandez
    type: MusicAlbum
    date published: 2022-08-11
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  additional property: OTSVerifyInstructions
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    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
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    date published: 2026-07-08T03:20:19Z
  audio: Oda Pasional
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    additional property: Tempo (BPM)
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    additional property: Danceability
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    additional property: Energy
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    additional property: Instrumentalness
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    additional property: Valence (Positivity)
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    additional property: Loudness (dB)
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    additional property: Key Name
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track: Reservista Purahei
  type: MusicRecording
  duration: PT3M54S
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  by artist: Agustín Barboza
  by artist: Las Mujeres que cantan la Guarania
  in album: Homenaje a Nuestra Música
    type: MusicAlbum
    date published: 1997-04-05
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    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
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    date published: 2026-07-31T15:20:15Z
  audio: Reservista Purahei
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    additional property: Liveness
    additional property: Valence (Positivity)
    additional property: Loudness (dB)
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Acousticness
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Instrumentalness
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Liveness
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Valence (Positivity)
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value: 0.238

Loudness (dB)
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value: -13.746

Key Name
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Mode Name
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