thumb|upright=1.35|Shoji paper sliding doors in the Rinshunkaku at Sankei-en (Important Cultural Property) thumb|upright=1.35|Shoji doors next to the tokonoma alcove, Rinshunkaku thumb|upright=1.35| a
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 0x9fc4cf21581de8f42426bab63f27fc40a1b80eafd110e4da12a75a14bcd4627a. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4ef0ccd5-1b1f-4c8d-8122-763c81270275.json and https://artists.proofprofile.net/proofs/artist/4ef0ccd5-1b1f-4c8d-8122-763c81270275.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).