thumb|Kitagata Housing project by SANAA thumb|Zollverein School of Management and Design (Essen/Germany) by SANAA thumb|Christian Dior building, Omotesandō thumb|Serpentine Gallery Pavilion, 2009 thum
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 0x2c7e5de3c99790ab602d3cdd0c8e838b24e87b9a2769681e69ce31f18318366e. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8f27c3e3-dfd1-4466-a59d-79030ddf7d11.json and https://artists.proofprofile.net/proofs/artist/8f27c3e3-dfd1-4466-a59d-79030ddf7d11.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).