Alberto Contreras
type: MusicGroup
genre: guaracha
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: 29
followers: 301
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xa9d4c79140c7843bea9c875c5d2ae2d0b831e7c8a316dfa3f3aa5b124ed17d83
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953407
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953407
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/3907b5c8-ebd2-4676-a332-02c25fd3cfdf.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/3907b5c8-ebd2-4676-a332-02c25fd3cfdf.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/3907b5c8-ebd2-4676-a332-02c25fd3cfdf
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-12T19:24:56Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xa9d4c79140c7843bea9c875c5d2ae2d0b831e7c8a316dfa3f3aa5b124ed17d83","name":"Alberto Contreras","registered_at":"2026-06-11T16:57:18Z","symbol":"NIM0074682","token_address":"0xf03dd9ff5b3e190801169fcae37c7328260cf4c6","type":"artist","uuid":"3907b5c8-ebd2-4676-a332-02c25fd3cfdf"}
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9d4c79140c7843bea9c875c5d2ae2d0b831e7c8a316dfa3f3aa5b124ed17d83. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3907b5c8-ebd2-4676-a332-02c25fd3cfdf.json and https://artists.proofprofile.net/proofs/artist/3907b5c8-ebd2-4676-a332-02c25fd3cfdf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-12T21:20:00Z
  text: {"copyright_id":"0xa9d4c79140c7843bea9c875c5d2ae2d0b831e7c8a316dfa3f3aa5b124ed17d83","name":"Alberto Contreras","registered_at":"2026-06-11T16:57:18Z","symbol":"NIM0074682","token_address":"0xf03dd9ff5b3e190801169fcae37c7328260cf4c6","type":"artist","uuid":"3907b5c8-ebd2-4676-a332-02c25fd3cfdf"}