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
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
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).
De Junior Bèta Canon [De Belangrijkste Onderwerpen Uit De Wetenschap Voor Kinderen (Onverkort)]