Han Samuel de Vries (born 31 August 1941, The Hague), is a Dutch oboist and is considered the doyen of the Dutch school of oboe playing. He studied oboe with Jaap Stotijn at the Royal Conservatory of
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 0xaf7465f696b9a3d7253d191174d84a2ac96a8782b8abc8001234b8e3372572db. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4e88d247-4471-42d0-a8fd-17a8b8b782ac.json and https://artists.proofprofile.net/proofs/artist/4e88d247-4471-42d0-a8fd-17a8b8b782ac.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).