thumb|left|aerial view of Gromo thumb|December 2020 snowfall – Gromo Gromo (Bergamasque: ) is a comune (municipality) in the Province of Bergamo in the Italian region of Lombardy, located about north
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 0xab3146ff86d96e86c0c8268589b4ca9c83f72d4cf000aa342b4f6f0ffcf1a74d. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9ab983cd-ff5a-491d-9572-fe16d1d097ac.json and https://artists.proofprofile.net/proofs/artist/9ab983cd-ff5a-491d-9572-fe16d1d097ac.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).