Simon Nicolaas (Simon) Keizer (Volendam, born 16 May 1984) is a Dutch singer-songwriter. Together with Nick Schilder, he formed a duo called Nick & Simon. Biography Simon wrote his first song in 2000
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 0x6337733cd705f65a2c8e8930f3e9773fc227e5f49f94a59983abe30455d47560. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eaa083dd-8a04-48e5-b48e-942ca1f6b615.json and https://artists.proofprofile.net/proofs/artist/eaa083dd-8a04-48e5-b48e-942ca1f6b615.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).