thumb|A traditional silhouette portrait of the late 18th century A silhouette (, ) is the image of a person, animal, object or scene represented as a solid shape of a single colour, usually black, wit
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 0xe7e1ad502e37fdbd21e9827a7c9ffbcccfbc6e714e6a675e7a940c8460353e79. 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/f73919f1-9441-41fb-90aa-d961bf1208ee.json and https://artists.proofprofile.net/proofs/artist/f73919f1-9441-41fb-90aa-d961bf1208ee.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).