Leo van de Ketterij (14 November 1950 – 5 July 2021) was a Dutch guitarist mostly known for his work in Shocking Blue in the early 1970s. Career From the age of fifteen he played in various regiona
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 0x531334c0a0182c0bf22727cbb699f21fda3756219bfa9ac0ba076504450f47b1. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d23dd267-f307-4cfe-969b-ded0a36fdd7b.json and https://artists.proofprofile.net/proofs/artist/d23dd267-f307-4cfe-969b-ded0a36fdd7b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).