Maria Roka
type: MusicGroup
genre: laïko
description: Mária Róka (15 September 1940 – 28 September 2021Szörnyű hír érkezett, férje után halt a magyar olimpikon sportolónő ) was a Hungarian canoe sprinter who competed in the mid-1960s. At the 1964 Summer
popularity: 2
followers: 3
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xa621f839d4d772382c2f86a21d08dc87d1ec4b0310cc5e4d1e7d1ac1a48395a8
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954587
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954587
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/b965236c-87ff-4ee2-824e-aef7affc7f7a.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/b965236c-87ff-4ee2-824e-aef7affc7f7a.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/b965236c-87ff-4ee2-824e-aef7affc7f7a
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T19:10:41Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xa621f839d4d772382c2f86a21d08dc87d1ec4b0310cc5e4d1e7d1ac1a48395a8","name":"Maria Roka","registered_at":"2026-06-20T16:13:01Z","symbol":"NIM1651619","token_address":"0x53d0e6fb15213107e15ad59590892d293031c9aa","type":"artist","uuid":"b965236c-87ff-4ee2-824e-aef7affc7f7a"}
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 0xa621f839d4d772382c2f86a21d08dc87d1ec4b0310cc5e4d1e7d1ac1a48395a8. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b965236c-87ff-4ee2-824e-aef7affc7f7a.json and https://artists.proofprofile.net/proofs/artist/b965236c-87ff-4ee2-824e-aef7affc7f7a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T19:10:41Z
  text: {"copyright_id":"0xa621f839d4d772382c2f86a21d08dc87d1ec4b0310cc5e4d1e7d1ac1a48395a8","name":"Maria Roka","registered_at":"2026-06-20T16:13:01Z","symbol":"NIM1651619","token_address":"0x53d0e6fb15213107e15ad59590892d293031c9aa","type":"artist","uuid":"b965236c-87ff-4ee2-824e-aef7affc7f7a"}