António Calvário
type: MusicGroup
genre: fado
description: António Calvário da Paz (born 17 October 1938) is a Portuguese singer, actor, and writer. He is best known for winning the first edition of and representing Portugal at the Eurovision Song Contest in
popularity: 9
followers: 2119
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953907
additional property: OTSProofURL
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  value: https://artists.proofprofile.net/proofs/artist/178d3ba1-1c1c-462d-9da3-319a95c015bb.ots
additional property: OTSRecordURL
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  value: https://artists.proofprofile.net/proofs/artist/178d3ba1-1c1c-462d-9da3-319a95c015bb.json
additional property: OTSVerificationAPI
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additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T07:39:24Z
additional property: OTSCanonicalRecord
  type: PropertyValue
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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 0x9e422dca2056d39d102bb2d7e35d784f9076764b0ebed60522b24fe29b251432. Chain 2 (Bitcoin): anchored in block 953907 (2026-06-16T07:39:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/178d3ba1-1c1c-462d-9da3-319a95c015bb.json and https://artists.proofprofile.net/proofs/artist/178d3ba1-1c1c-462d-9da3-319a95c015bb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T07:39:24Z
  text: {"copyright_id":"0x9e422dca2056d39d102bb2d7e35d784f9076764b0ebed60522b24fe29b251432","name":"António Calvário","registered_at":"2026-06-15T21:39:45Z","symbol":"NIM0839903","token_address":"0x6d7c009e6b9782d1dc1e7a8a4976c7a03b08975d","type":"artist","uuid":"178d3ba1-1c1c-462d-9da3-319a95c015bb"}
album: Sarilho de Fraldas (Original Soundtrack) [2022 Remaster]
  type: MusicAlbum
  date published: 1967-09-09
album: António Calvário
  type: MusicAlbum
  date published: 2014-10-22
track: Mocidade Mocidade
  type: MusicRecording
  duration: PT2M46S
  duration ms: 166266
  explicit: false
  by artist: António Calvário
  in album: Canções de Sempre Vol. I
    type: MusicAlbum
    date published: 2012-03-28
  popularity: 7
  isrc code: PTOV10100206
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  additional property: OTSVerificationAPI
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  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-30T15:42:38Z
  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 0xab86beabc75f381b8f98b868c65d82959cf20ccbb5c7637059738c406505803d. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/PTOV10100206.
    date published: 2026-07-30T15:42:38Z
  audio: Mocidade Mocidade
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
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    additional property: Mode (Major/Minor)
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    additional property: Time Signature
      type: PropertyValue
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    additional property: Danceability
      type: PropertyValue
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    additional property: Energy
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    additional property: Speechiness
      type: PropertyValue
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    additional property: Acousticness
      type: PropertyValue
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    additional property: Instrumentalness
      type: PropertyValue
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    additional property: Liveness
      type: PropertyValue
      value: 0.287
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.675
    additional property: Loudness (dB)
      type: PropertyValue
      value: -15.093
    additional property: Key Name
      type: PropertyValue
      value: E
    additional property: Mode Name
      type: PropertyValue
      value: Major