Joseph Lonsdale (born ) is an American entrepreneur and venture capitalist. He co-founded companies including Palantir Technologies, Addepar, and OpenGov, and co-founded and works as the managing part
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 0x1b771fb0cc5b68f19091aa5ac0f08fa990fb399a3f69d581d0828bc3a8819e1b. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dcca2d60-5470-4fdd-ad1a-d0c0ac0366b5.json and https://artists.proofprofile.net/proofs/artist/dcca2d60-5470-4fdd-ad1a-d0c0ac0366b5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).