The Louvre, or the Louvre Museum ( ), is a national art museum in Paris, France. The Louvre, a former royal palace, is known for its collection of celebrated paintings collected by the French kings,
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 0x1a10aaa712f74dfc76adc6c3ac2a6335049550fa1a3c3174b9c9744bcafcc603. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f2758486-3b69-48de-bb8f-816bba705bfb.json and https://artists.proofprofile.net/proofs/artist/f2758486-3b69-48de-bb8f-816bba705bfb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).