thumb|upright=1.2|Love's Messenger by Marie Spartali Stillman, 1885 thumb|upright=1.2|The Love Letter by Johannes Vermeer, c. 1669-70 thumb|upright=1.2|The Love Letter by Jean-Honoré Fragonard, c. 177
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 0x34dfafe45ac54bcf695782d4d4c3d1e564552bf93cf20ebe92616e7fad33084b. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d5f973c9-9ace-45e7-898e-8759dc14cdf6.json and https://artists.proofprofile.net/proofs/artist/d5f973c9-9ace-45e7-898e-8759dc14cdf6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).