Aart Staartjes (1 March 1938 – 12 January 2020) was a Dutch actor, director, television presenter and documentary maker from Amsterdam. He portrayed Meneer Aart ("Mister Aart") on Sesamstraat, the Dut
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 0x0b228e830598dedb906d41bf962dc7590d63d5f32664f0bdf098c742260adcc1. Chain 2 (Bitcoin): anchored in block 954115 (2026-06-17T15:44:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/77c93b39-7298-4ed9-9abf-d0d9d4292ddf.json and https://artists.proofprofile.net/proofs/artist/77c93b39-7298-4ed9-9abf-d0d9d4292ddf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).