Juan el de la Vara
type: MusicGroup
genre: flamenco
description: thumb|Juan el de la Vara with Paco de Lucía in the early 1970s Juan el de la Vara (born 1938 in Barcelona) is a Spanish flamenco singer. He has worked with numerous artists, including Paco de Lucía.
popularity: 2
followers: 1005
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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 0xf102a7df24cb38cc77717e9836cca28aa1ed832cc81c29055990d34b924f3b05. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/56741540-8ede-4699-b10c-250471aaff55.json and https://artists.proofprofile.net/proofs/artist/56741540-8ede-4699-b10c-250471aaff55.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:10:43Z
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album: Fuente De Los Amaya
  type: MusicAlbum
  date published: 2010-05-03
album: Por Fandangos!
  type: MusicAlbum
  date published: 2020-08-07
track: Que vengan de dos en dos - Tangos
  type: MusicRecording
  duration: PT2M37S
  duration ms: 157853
  explicit: false
  by artist: Juan el de la Vara
  in album: FlamencoPassion. Por Tangos
    type: MusicAlbum
    date published: 2001-06-02
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  additional property: OTSTimestamp
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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
    type: DigitalDocument
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    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d0424b3ccd6623300a14d981709af5b9b8dd18922fa5894d2a91e1ad620b50. 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/ES5099800144.
    date published: 2026-07-08T03:20:19Z
  audio: Que vengan de dos en dos - Tangos
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    additional property: Tempo (BPM)
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    additional property: Mode (Major/Minor)
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      value: 5
    additional property: Danceability
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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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    additional property: Loudness (dB)
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    additional property: Key Name
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      value: Eb
    additional property: Mode Name
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