Roberto Calero
type: MusicGroup
genre: bolero
genre: chicha
description: Roberto Alfonso Calero Piedrahita (January 1, 1943 – April 4, 2021) was an Ecuadorian bolero singer. Biography He was born in 1943 in Vinces, Los Ríos Province. He started his musical career when he
popularity: 14
followers: 10883
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSProofURL
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additional property: OTSRecordURL
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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  value: 2026-06-15T02:33:01Z
additional property: OTSCanonicalRecord
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additional property: OTSVerifyInstructions
  type: PropertyValue
  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 0x8e94746b6f3d82d1e01eb76a29405a471911c617b54c98e9541f7053ea54ebc8. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/90286dab-9556-490e-aac2-564e209795fe.json and https://artists.proofprofile.net/proofs/artist/90286dab-9556-490e-aac2-564e209795fe.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-15T02:33:01Z
  text: {"copyright_id":"0x8e94746b6f3d82d1e01eb76a29405a471911c617b54c98e9541f7053ea54ebc8","name":"Roberto Calero","registered_at":"2026-06-14T19:34:46Z","symbol":"NIM0554701","token_address":"0x7289be573df3a8fc2fd40baedc58fccd0c324940","type":"artist","uuid":"90286dab-9556-490e-aac2-564e209795fe"}
album: La Pena de Mi Viejo
  type: MusicAlbum
  date published: 2021-02-03
album: Carta al Cielo
  type: MusicAlbum
  date published: 2021-02-03