Robbert Dijkgraaf
type: MusicGroup
description: Robertus Henricus "Robbert" Dijkgraaf, (; born 24 January 1960) is a Dutch theoretical physicist, mathematician and string theorist and former politician. He served as the Minister of Education, Cult
popularity: 5
followers: 34
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x0072377ab4a8395b02489a3d104b779958ea5f7cd78065ce028bb33761309cda
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954043
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954043
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/400cc1d0-0595-40b4-8de0-0741a134599a.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/400cc1d0-0595-40b4-8de0-0741a134599a.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/400cc1d0-0595-40b4-8de0-0741a134599a
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T04:15:20Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x0072377ab4a8395b02489a3d104b779958ea5f7cd78065ce028bb33761309cda","name":"Robbert Dijkgraaf","registered_at":"2026-06-16T11:52:13Z","symbol":"NIM1043425","token_address":"0xed0de79a5132d5d6466631d5ff433e4a72210854","type":"artist","uuid":"400cc1d0-0595-40b4-8de0-0741a134599a"}
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 0x0072377ab4a8395b02489a3d104b779958ea5f7cd78065ce028bb33761309cda. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/400cc1d0-0595-40b4-8de0-0741a134599a.json and https://artists.proofprofile.net/proofs/artist/400cc1d0-0595-40b4-8de0-0741a134599a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0x0072377ab4a8395b02489a3d104b779958ea5f7cd78065ce028bb33761309cda","name":"Robbert Dijkgraaf","registered_at":"2026-06-16T11:52:13Z","symbol":"NIM1043425","token_address":"0xed0de79a5132d5d6466631d5ff433e4a72210854","type":"artist","uuid":"400cc1d0-0595-40b4-8de0-0741a134599a"}
album: De Junior Bèta Canon [De Belangrijkste Onderwerpen Uit De Wetenschap Voor Kinderen (Onverkort)]
  type: MusicAlbum
  date published: 2010-02-26
album: De junior bèta canon [De belangrijkste onderwerpen uit de wetenschap voor kinderen (Onverkort)]
  type: MusicAlbum
  date published: 2022-01-21