Prada S.p.A. ( , ) is an Italian luxury fashion house founded in 1913 in Milan by Mario Prada. Prada licenses its name and branding to Luxottica for eyewear and L’Oréal for fragrances and cosmetics.
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x864851babfe60fb58290f2e617186188626aaa5599ccd2acef15405a3887b2b7. Chain 2 (Bitcoin): anchored in block 953911 (2026-06-16T08:03:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/18cd479a-1852-4563-869a-219e612eb34e.json and https://artists.proofprofile.net/proofs/artist/18cd479a-1852-4563-869a-219e612eb34e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).