thumb|upright|Rubin's vase is an optical illusion in which the negative space around the vase forms the silhouettes of two faces in profile, a well-known example of figure-ground reversal by emphasizi
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 0xd671b271707d4b3464cc2a76434c312e955351e0b35da07b25262de90457f380. 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/e0f0a846-c911-4453-ab24-95490fecbf76.json and https://artists.proofprofile.net/proofs/artist/e0f0a846-c911-4453-ab24-95490fecbf76.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).