Hein van de Geyn (born 18 July 1956) is a jazz double bassist, composer and band leader from the Netherlands. Van de Geyn also teaches double bass and music. Early life Hein van de Geyn was born in S
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 0x468bc78d160388692b11a58dc038c2465bda30ceaad7ee132465fc530bef1102. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9e610fb2-5bb0-46a4-8d31-d833661a7a10.json and https://artists.proofprofile.net/proofs/artist/9e610fb2-5bb0-46a4-8d31-d833661a7a10.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).