Osvaldo Fresedo
type: MusicGroup
genre: tango
description: Osvaldo Fresedo (May 5, 1897 - November 18, 1984), nicknamed El pibe de La Paternal ("the kid from La Paternal") was an Argentine songwriter and director of a tango orchestra. He had one of the longe
popularity: 29
followers: 12086
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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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  date published: 2026-06-12T19:24:56Z
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album: Tango, Tango
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  date published: 2016-01-15
  track: Tormenta
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    by artist: Enrique Santos Discépolo
    by artist: Orquesta Típica Argentina
    by artist: Francisco Canaro
    in album: Tango, Tango
      type: MusicAlbum
      date published: 2016-01-15
    popularity: 23
    genre: tango
    isrc code: QMEU31506358
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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
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      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e40b69a3837fcfaaec166c70da33a5f4caaef2c2701e9f5b72d4e9f81003a4. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QMEU31506358.
      date published: 2026-06-13T15:41:10Z
    audio: Tormenta
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  track: La Cumparsita
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    by artist: Orquesta Típica Argentina
    by artist: Oscar Roma
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      type: MusicAlbum
      date published: 2016-01-15
    popularity: 28
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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 0x4170aa7da09cf35104551be8ca582f801e8c7af934a9df2ded614563edddd98b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMEU31506362.
      date published: 2026-06-13T12:53:06Z
    audio: La Cumparsita
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album: Viejo Rincón - Tangos 1925-1927
album: Pero Yo Sé
album: Tangos del Ayer y del Hoy - Pasión y Melancolía de Osvaldo Fresedo
album: El Pibe De La Paternal - Osvaldo Fresedo Early Tangos
album: El Pibe de La Paternal (Remastered)
album: Tangos y Valses
album: Melenita negra (1927)
album: Sangre azul (1920 - 1923)
album: (1927)
album: (1926-1928)
album: Tradición (1928-1929)
album: (1927-1928)
album: Colibriyo (1927-1938)
album: Nostalgias (Remastered)
album: De pura cepa (Remastered)
album: Apasionado (Remastered)
album: (1941-1942)
album: (1928)
album: Memorial del Tango
album: Felicia
album: 20 Tangos
album: Los Inmortales del Tango
album: Fugitiva
album: Tango Mio
album: Sollozos
album: Snobismo
album: Pampero
album: Tango Classics 338: Felicia (Historical Recordings)
album: Tango Classics 337: A la Deriva (Historical Recordings)
album: Tango Classics 336: Fui Testigo (Historical Recordings)
album: Tango Classics 335: Preparense (Historical Recordings)
album: Tango Classics 334: En Mis Noches (Historical Recordings)
album: Enamorado Estoy
album: Dano
album: Buena Vida
album: Alfredo de Angelis vs. Osvaldo Fresedo, Tango
album: El Tango de los Pioneros
album: (1927-1928), Vol. 3
album: (1927-1928), Vol. 2
album: (1927-1928), Vol. 1

Liveness
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value: 0.123

Valence (Positivity)
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Loudness (dB)
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value: -17.396

Key Name
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value: G

Mode Name
type: PropertyValue
value: Major

Viejo Rincón - Tangos 1925-1927
type: MusicAlbum
date published: 2024-05-31

Pero Yo Sé
type: MusicAlbum
date published: 2023-11-19

Tangos del Ayer y del Hoy - Pasión y Melancolía de Osvaldo Fresedo
type: MusicAlbum
date published: 2023-04-28

El Pibe De La Paternal - Osvaldo Fresedo Early Tangos
type: MusicAlbum
date published: 2021-12-03

El Pibe de La Paternal (Remastered)
type: MusicAlbum
date published: 2020-10-03
track: Buscándote - Remastered
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  by artist: Osvaldo Fresedo
  in album: El Pibe de La Paternal (Remastered)
    type: MusicAlbum
    date published: 2020-10-03
  genre: tango
  genre: orquesta-tipica
  genre: vintage-tango
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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
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    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8351de5cc9a66aed8f57459dcea4b670eb428f1faf7244b9006c1057ccb747c2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEXO32076130.
    date published: 2026-07-02T03:55:08Z
  audio: Buscándote - Remastered
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    additional property: Danceability
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    additional property: Speechiness
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    additional property: Acousticness
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    additional property: Valence (Positivity)
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track: Vida Mía - Remastered
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  by artist: Osvaldo Fresedo
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    date published: 2020-10-03
  genre: tango
  genre: orquesta-tipica
  genre: vintage-tango
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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
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    date published: 2026-07-13T07:53:33Z
  audio: Vida Mía - Remastered
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Tangos y Valses
type: MusicAlbum
date published: 2019-01-05
track: Amor (Vals)
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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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    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcbdeaba36fd1bfd228ba96288c7a64907eb8b096fd6da1bf66a8f8412aa4933. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CA5KR1846963.
    date published: 2026-07-02T03:55:08Z
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track: Buscándote (Tango)
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  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-06-20T12:23:09+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xfdcaf8d87520652e4452b1546971273df5ad68b52a136ad3a63471c32658befe
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 956302
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/956302
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR1846964
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-02T03:30:09Z
  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 0xfdcaf8d87520652e4452b1546971273df5ad68b52a136ad3a63471c32658befe. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CA5KR1846964.
    date published: 2026-07-02T03:30:09Z
  audio: Buscándote (Tango)
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 133.809
    additional property: Musical Key
      type: PropertyValue
      value: 0
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.488
    additional property: Energy
      type: PropertyValue
      value: 0.264
    additional property: Speechiness
      type: PropertyValue
      value: 0.034
    additional property: Acousticness
      type: PropertyValue
      value: 0.961
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.033
    additional property: Liveness
      type: PropertyValue
      value: 0.13
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.605
    additional property: Loudness (dB)
      type: PropertyValue
      value: -15.574
    additional property: Key Name
      type: PropertyValue
      value: C
    additional property: Mode Name
      type: PropertyValue
      value: Major
track: Tres Recuerdos (Vals)
  type: MusicRecording
  duration: PT2M20S
  duration ms: 140120
  explicit: false
  by artist: Osvaldo Fresedo
  in album: Tangos y Valses
    type: MusicAlbum
    date published: 2019-01-05
  genre: tango
  genre: orquesta-tipica
  genre: vintage-tango
  isrc code: CA5KR1846975
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-06-27T16:10:29+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xe30b9e19746d36c8c89548afe58be134b772606190f9b4c62f97480e211228d0
  additional property: OTSHash
  additional property: OTSBitcoinBlock
  additional property: OTSBitcoinBlockVerifyURL
  additional property: OTSVerificationAPI
  additional property: OTSTimestamp
  additional property: OTSVerifyInstructions
  subject of: OpenTimestamps Proof of Existence
  audio: Tres Recuerdos (Vals)

OTSHash
type: PropertyValue

OTSBitcoinBlock
type: PropertyValue
value: 956304

OTSBitcoinBlockVerifyURL
type: PropertyValue
value: https://blockstream.info/api/block-height/956304

OTSVerificationAPI
type: PropertyValue
value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA5KR1846975

OTSTimestamp
type: PropertyValue
value: 2026-07-02T03:55:08Z

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 0xe30b9e19746d36c8c89548afe58be134b772606190f9b4c62f97480e211228d0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CA5KR1846975.
date published: 2026-07-02T03:55:08Z

Tres Recuerdos (Vals)
type: AudioObject
additional property: Tempo (BPM)
  type: PropertyValue
  value: 168.711
additional property: Musical Key
  type: PropertyValue
  value: 10
additional property: Mode (Major/Minor)
  type: PropertyValue
  value: 1
additional property: Time Signature
  type: PropertyValue
  value: 5
additional property: Danceability
  type: PropertyValue
  value: 0.321
additional property: Energy
  type: PropertyValue
  value: 0.252
additional property: Speechiness
  type: PropertyValue
  value: 0.04
additional property: Acousticness
  type: PropertyValue
  value: 0.987
additional property: Instrumentalness
  type: PropertyValue
  value: 0.67
additional property: Liveness
  type: PropertyValue
  value: 0.388
additional property: Valence (Positivity)
  type: PropertyValue
  value: 0.782
additional property: Loudness (dB)
  type: PropertyValue
  value: -19.09
additional property: Key Name
  type: PropertyValue
  value: Bb
additional property: Mode Name
  type: PropertyValue
  value: Major

Melenita negra (1927)
type: MusicAlbum
date published: 2016-10-17

Sangre azul (1920 - 1923)
type: MusicAlbum
date published: 2016-10-13

(1927)
type: MusicAlbum
date published: 2016-07-18

(1926-1928)
type: MusicAlbum
date published: 2016-06-28

Tradición (1928-1929)
type: MusicAlbum
date published: 2016-05-31

(1927-1928)
type: MusicAlbum
date published: 2016-05-24

Colibriyo (1927-1938)
type: MusicAlbum
date published: 2016-05-19

Nostalgias (Remastered)
type: MusicAlbum
date published: 2016-01-19
track: Cordobesita - Remastered
  type: MusicRecording
  duration: PT2M27S
  duration ms: 147084
  explicit: false
  by artist: Osvaldo Fresedo
  in album: Nostalgias (Remastered)
    type: MusicAlbum
    date published: 2016-01-19
  genre: tango
  genre: orquesta-tipica
  genre: vintage-tango
  isrc code: ES6601600120
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-06-19T17:22:08+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xe7f6f50221e00c54b7c8b6d59330004e34d890294597904186b7eee001424062
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 956302
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/956302
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES6601600120
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-02T03:30:09Z
  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 0xe7f6f50221e00c54b7c8b6d59330004e34d890294597904186b7eee001424062. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ES6601600120.
    date published: 2026-07-02T03:30:09Z
  audio: Cordobesita - Remastered
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 140.885
    additional property: Musical Key
      type: PropertyValue
      value: 6
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.74
    additional property: Energy
      type: PropertyValue
      value: 0.271
    additional property: Speechiness
      type: PropertyValue
      value: 0.066
    additional property: Acousticness
      type: PropertyValue
      value: 0.975
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.055
    additional property: Liveness
      type: PropertyValue
      value: 0.326
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.867
    additional property: Loudness (dB)
      type: PropertyValue
      value: -15.334
    additional property: Key Name
      type: PropertyValue
      value: F#
    additional property: Mode Name
      type: PropertyValue
      value: Major

De pura cepa (Remastered)
type: MusicAlbum
date published: 2016-01-19

Apasionado (Remastered)
type: MusicAlbum
date published: 2016-01-19

(1941-1942)
type: MusicAlbum
date published: 2015-10-13
track: Después del Carnaval
  type: MusicRecording
  duration: PT2M45S
  duration ms: 165093
  explicit: false
  by artist: Osvaldo Fresedo
  in album: (1941-1942)
    type: MusicAlbum
    date published: 2015-10-13
  genre: tango
  genre: orquesta-tipica
  genre: vintage-tango
  isrc code: ARA821550617
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-22T11:22:39+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x94eb3ed04c34bc2d39a9c20696bae3c926b25eaabf3fedbfba7e5a6c71ac00fc
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 959128
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/959128
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARA821550617
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-22T12:33:25Z
  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 0x94eb3ed04c34bc2d39a9c20696bae3c926b25eaabf3fedbfba7e5a6c71ac00fc. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/ARA821550617.
    date published: 2026-07-22T12:33:25Z
  audio: Después del Carnaval
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 142.118
    additional property: Musical Key
      type: PropertyValue
      value: 8
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 0
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.67
    additional property: Energy
      type: PropertyValue
      value: 0.345
    additional property: Speechiness
      type: PropertyValue
      value: 0.045
    additional property: Acousticness
      type: PropertyValue
      value: 0.926
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.168
    additional property: Liveness
      type: PropertyValue
      value: 0.169
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.84
    additional property: Loudness (dB)
      type: PropertyValue
      value: -14.253
    additional property: Key Name
      type: PropertyValue
      value: Ab
    additional property: Mode Name
      type: PropertyValue
      value: Minor
track: Buscandote
  type: MusicRecording
  duration: PT2M50S
  duration ms: 170853
  explicit: false
  by artist: Osvaldo Fresedo
  in album: (1941-1942)
    type: MusicAlbum
    date published: 2015-10-13
  genre: tango
  genre: orquesta-tipica
  genre: vintage-tango
  isrc code: ARA821550628
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-06-21T10:12:53+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x9dc8ab1944015cba7b709ad7ba192933af99d0ddd441a2a2e35615272e6c54d8
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 956302
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/956302
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ARA821550628
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-02T03:30:09Z
  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 0x9dc8ab1944015cba7b709ad7ba192933af99d0ddd441a2a2e35615272e6c54d8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ARA821550628.
    date published: 2026-07-02T03:30:09Z
  audio: Buscandote
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 135.819
    additional property: Musical Key
      type: PropertyValue
      value: 3
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.427
    additional property: Energy
      type: PropertyValue
      value: 0.362
    additional property: Speechiness
      type: PropertyValue
      value: 0.033
    additional property: Acousticness
      type: PropertyValue
      value: 0.959
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.002
    additional property: Liveness
      type: PropertyValue
      value: 0.119
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.514
    additional property: Loudness (dB)
      type: PropertyValue
      value: -14.572
    additional property: Key Name
      type: PropertyValue
      value: Eb
    additional property: Mode Name
      type: PropertyValue
      value: Major

(1928)
type: MusicAlbum
date published: 2015-09-30

Memorial del Tango
type: MusicAlbum
date published: 2015-07-22

Felicia
type: MusicAlbum
date published: 2015-07-16

20 Tangos
type: MusicAlbum
date published: 2015-07-07

Los Inmortales del Tango
type: MusicAlbum
date published: 2015-04-29
track: Taquito Militar
  type: MusicRecording
  duration: PT2M21S
  duration ms: 141373
  explicit: false
  by artist: Armando Pontier
  in album: Los Inmortales del Tango
    type: MusicAlbum
    date published: 2015-04-29
  isrc code: QM6MZ1540248
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-22T16:01:07+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0xffc7a6c42b989a6371e2ac97974996a573d0728bab071a9410288f850853a006
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 959152
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/959152
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6MZ1540248
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-22T19:01:39Z
  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 0xffc7a6c42b989a6371e2ac97974996a573d0728bab071a9410288f850853a006. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:01:39Z), 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/QM6MZ1540248.
    date published: 2026-07-22T19:01:39Z
  audio: Taquito Militar
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 134.119
    additional property: Musical Key
      type: PropertyValue
      value: 9
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 0
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.616
    additional property: Energy
      type: PropertyValue
      value: 0.639
    additional property: Speechiness
      type: PropertyValue
      value: 0.036
    additional property: Acousticness
      type: PropertyValue
      value: 0.734
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.88
    additional property: Liveness
      type: PropertyValue
      value: 0.063
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.885
    additional property: Loudness (dB)
      type: PropertyValue
      value: -11.394
    additional property: Key Name
      type: PropertyValue
      value: A
    additional property: Mode Name
      type: PropertyValue
      value: Minor
track: Canaro en París
  type: MusicRecording
  duration: PT2M51S
  duration ms: 171640
  explicit: false
  by artist: Héctor Varela
  in album: Los Inmortales del Tango
    type: MusicAlbum
    date published: 2015-04-29
  isrc code: QM6MZ1540253
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-06T08:26:20+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x8cf7d2c5845156d7d55a9fe9fb19a695183f21dbcfe54e499ed61c3ad2204702
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 957819
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/957819
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM6MZ1540253
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-13T07:53:33Z
  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
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    encoding format: application/vnd.opentimestamps.ots
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    date published: 2026-07-13T07:53:33Z
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  audio: Champagne Tango
track: El Flete
track: Pimienta
track: Tigre Viejo

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OpenTimestamps Proof of Existence
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description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9dceb4a7e421d3a4ebed36eb5c3af544662e3bd42799f1ade1eeca162eedb3c. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QM6MZ1540257.
date published: 2026-07-22T15:38:35Z

Champagne Tango
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El Flete
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-22T20:18:50Z
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Pimienta
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:55:08Z
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Tigre Viejo
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-07-02T03:55:08Z
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Fugitiva
type: MusicAlbum
date published: 2014-12-22

Tango Mio
type: MusicAlbum
date published: 2014-12-09

Sollozos
type: MusicAlbum
date published: 2014-12-09

Snobismo
type: MusicAlbum
date published: 2014-12-09

Pampero
type: MusicAlbum
date published: 2014-12-09

Tango Classics 338: Felicia (Historical Recordings)
type: MusicAlbum
date published: 2014-12-05

Tango Classics 337: A la Deriva (Historical Recordings)
type: MusicAlbum
date published: 2014-12-05

Tango Classics 336: Fui Testigo (Historical Recordings)
type: MusicAlbum
date published: 2014-12-05

Tango Classics 335: Preparense (Historical Recordings)
type: MusicAlbum
date published: 2014-12-05

Tango Classics 334: En Mis Noches (Historical Recordings)
type: MusicAlbum
date published: 2014-12-05

Enamorado Estoy
type: MusicAlbum
date published: 2014-11-29

Dano
type: MusicAlbum
date published: 2014-11-29

Buena Vida
type: MusicAlbum
date published: 2014-11-29

Alfredo de Angelis vs. Osvaldo Fresedo, Tango
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date published: 2014-11-13

El Tango de los Pioneros
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date published: 2014-09-30

(1927-1928), Vol. 3
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date published: 2014-09-05

(1927-1928), Vol. 2
type: MusicAlbum
date published: 2014-09-05

(1927-1928), Vol. 1
type: MusicAlbum
date published: 2014-09-05