thumb|right|300px|True, visible, and astronomical horizons. Not shown: refracted horizon. Most commonly, the horizon is the border between the surface of a celestial body and its sky when viewed from
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 0xbe5ebc7899b20be7c2e2eb9137ac7b2a7f932860a2a9b28c7966c10abe339d55. 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/806c0a7d-2701-4dee-a974-e39cf0e22953.json and https://artists.proofprofile.net/proofs/artist/806c0a7d-2701-4dee-a974-e39cf0e22953.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).