Jan Hádek
type: MusicGroup
genre: choral
description: Jan Hádek (born 4 September 1945) is a Czech former speedway rider. Speedway career Hádek partnered Jan Holub I to the World Pairs final at the 1974 Speedway World Pairs Championship, which was won
popularity: 6
followers: 14
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x91263871b187258be1d9a844e01c2857a562fff3b5e11b087dec20d13e221e98
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953899
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953899
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/11910ace-1f09-40c0-a556-92d5c91dd2c0.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/11910ace-1f09-40c0-a556-92d5c91dd2c0.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/11910ace-1f09-40c0-a556-92d5c91dd2c0
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T06:37:25Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x91263871b187258be1d9a844e01c2857a562fff3b5e11b087dec20d13e221e98","name":"Jan Hádek","registered_at":"2026-06-15T19:40:14Z","symbol":"NIM0811414","token_address":"0x401fec9617b988b8185f639c86216f67f374cf40","type":"artist","uuid":"11910ace-1f09-40c0-a556-92d5c91dd2c0"}
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 0x91263871b187258be1d9a844e01c2857a562fff3b5e11b087dec20d13e221e98. Chain 2 (Bitcoin): anchored in block 953899 (2026-06-16T06:37:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/11910ace-1f09-40c0-a556-92d5c91dd2c0.json and https://artists.proofprofile.net/proofs/artist/11910ace-1f09-40c0-a556-92d5c91dd2c0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T06:37:25Z
  text: {"copyright_id":"0x91263871b187258be1d9a844e01c2857a562fff3b5e11b087dec20d13e221e98","name":"Jan Hádek","registered_at":"2026-06-15T19:40:14Z","symbol":"NIM0811414","token_address":"0x401fec9617b988b8185f639c86216f67f374cf40","type":"artist","uuid":"11910ace-1f09-40c0-a556-92d5c91dd2c0"}