Eduard Haken
type: MusicGroup
genre: opera
description: right|thumb|Eduard Haken Eduard Haken (22 March 1910 – 12 January 1996 in Prague) was a Czech operatic bass who had a lengthy career at the National Theatre in Prague during the 20th century. Although
popularity: 2
followers: 119
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xcd0d92ea3bd8c7e6a75384e71fe579d07016835dd106910e376c6eec0989ffc0
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954650
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954650
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/daa926a3-7981-4a47-9940-8012131e00cf.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/daa926a3-7981-4a47-9940-8012131e00cf.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/daa926a3-7981-4a47-9940-8012131e00cf
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T04:51:12Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xcd0d92ea3bd8c7e6a75384e71fe579d07016835dd106910e376c6eec0989ffc0","name":"Eduard Haken","registered_at":"2026-06-21T04:22:51Z","symbol":"NIM1818396","token_address":"0x6b07c5bb36168d8315c43f438926f1f00175d4dc","type":"artist","uuid":"daa926a3-7981-4a47-9940-8012131e00cf"}
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 0xcd0d92ea3bd8c7e6a75384e71fe579d07016835dd106910e376c6eec0989ffc0. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/daa926a3-7981-4a47-9940-8012131e00cf.json and https://artists.proofprofile.net/proofs/artist/daa926a3-7981-4a47-9940-8012131e00cf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T04:51:12Z
  text: {"copyright_id":"0xcd0d92ea3bd8c7e6a75384e71fe579d07016835dd106910e376c6eec0989ffc0","name":"Eduard Haken","registered_at":"2026-06-21T04:22:51Z","symbol":"NIM1818396","token_address":"0x6b07c5bb36168d8315c43f438926f1f00175d4dc","type":"artist","uuid":"daa926a3-7981-4a47-9940-8012131e00cf"}
album: Operatic Recital / Dvořák, Smetana, Tchaikovsky, Verdi
  type: MusicAlbum
  date published: 1996-01-01
album: Sempatkan Hatimu
  type: MusicAlbum
  date published: 2024-09-30