Juan Alfonso
type: MusicGroup
description: Juan Alfonso Armenteros (born 8 February 1958) is a Cuban rower. He competed in two events at the 1980 Summer Olympics. References External links Category:1958 births Category:Living people Categor
popularity: 5
followers: 21
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x7305c52b731d5065d3a9a02e1f7e5757362a4deaf10c130d41cf5b106a2f7da3
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954553
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954553
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/abd4b391-acf6-4d33-be24-6bcd70861bda.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/abd4b391-acf6-4d33-be24-6bcd70861bda.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/abd4b391-acf6-4d33-be24-6bcd70861bda
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T11:51:30Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x7305c52b731d5065d3a9a02e1f7e5757362a4deaf10c130d41cf5b106a2f7da3","name":"Juan Alfonso","registered_at":"2026-06-20T09:51:24Z","symbol":"NIM1585168","token_address":"0x57bf9b003dbafad8f067ff9e80540420b9552165","type":"artist","uuid":"abd4b391-acf6-4d33-be24-6bcd70861bda"}
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 0x7305c52b731d5065d3a9a02e1f7e5757362a4deaf10c130d41cf5b106a2f7da3. Chain 2 (Bitcoin): anchored in block 954553 (2026-06-20T11:51:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/abd4b391-acf6-4d33-be24-6bcd70861bda.json and https://artists.proofprofile.net/proofs/artist/abd4b391-acf6-4d33-be24-6bcd70861bda.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T11:51:30Z
  text: {"copyright_id":"0x7305c52b731d5065d3a9a02e1f7e5757362a4deaf10c130d41cf5b106a2f7da3","name":"Juan Alfonso","registered_at":"2026-06-20T09:51:24Z","symbol":"NIM1585168","token_address":"0x57bf9b003dbafad8f067ff9e80540420b9552165","type":"artist","uuid":"abd4b391-acf6-4d33-be24-6bcd70861bda"}