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 0x8068e915165fb9489914afa3e67ff14501db6bec19b4778872a415bcf15e73b4. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7c066509-7ae7-4836-a4bf-aad0ae000ec0.json and https://artists.proofprofile.net/proofs/artist/7c066509-7ae7-4836-a4bf-aad0ae000ec0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).