David Castello-Lopes (born 16 September 1981) is a French-Portuguese journalist, comedian, and videographer. Early life David Castello-Lopes was born on 16 September 1981 in the 12th arrondissement
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 0xbac78a8de342a29240a2aeb23ce4aeed8f856062e1d731d69bface2c494b64af. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aef8a909-0280-4b0f-a055-ea58a004a308.json and https://artists.proofprofile.net/proofs/artist/aef8a909-0280-4b0f-a055-ea58a004a308.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).