Le Petit Trianon is a historic mansion on the grounds of De Anza College at 21250 Stevens Creek Blvd. in Cupertino, California. The building now serves as the California History Center. History thumb
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 0x2b0dbffd640d6399b2181292c0283cf15ba3506c7f4a68bd5bbf33dcfe1a9a6d. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0492c883-92be-43db-bc75-046bfaeaef0b.json and https://artists.proofprofile.net/proofs/artist/0492c883-92be-43db-bc75-046bfaeaef0b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).