ALBERTO CONTRERAS
type: MusicGroup
description: Alberto Contreras (died 1958) was a Spanish-born stage and film actor who settled in Argentina.Richard p.96 He portrayed don Florín in the play La sirena varada, written by Alejandro Casona. Selected
popularity: 4
followers: 1
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x20ca500054b998cc340a909ff8483107107c061d881a904d15a5dd8f5cd86ab6
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954618
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954618
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/c96bda62-c13d-47d1-806a-0687db5ff097.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/c96bda62-c13d-47d1-806a-0687db5ff097.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/c96bda62-c13d-47d1-806a-0687db5ff097
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T23:05:13Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x20ca500054b998cc340a909ff8483107107c061d881a904d15a5dd8f5cd86ab6","name":"ALBERTO CONTRERAS","registered_at":"2026-06-20T22:16:29Z","symbol":"NIM1731631","token_address":"0xdb46fdd41805eb13eb8a24a4e875a3048ad54a7b","type":"artist","uuid":"c96bda62-c13d-47d1-806a-0687db5ff097"}
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
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ca500054b998cc340a909ff8483107107c061d881a904d15a5dd8f5cd86ab6. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c96bda62-c13d-47d1-806a-0687db5ff097.json and https://artists.proofprofile.net/proofs/artist/c96bda62-c13d-47d1-806a-0687db5ff097.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T23:05:13Z
  text: {"copyright_id":"0x20ca500054b998cc340a909ff8483107107c061d881a904d15a5dd8f5cd86ab6","name":"ALBERTO CONTRERAS","registered_at":"2026-06-20T22:16:29Z","symbol":"NIM1731631","token_address":"0xdb46fdd41805eb13eb8a24a4e875a3048ad54a7b","type":"artist","uuid":"c96bda62-c13d-47d1-806a-0687db5ff097"}