thumb|Sol Iustitiae (Sun of Righteousness), derived from the Judeo-Christian Bible, Malachi 4:2. By Albrecht Dürer, Sunday (Latin: dies solis meaning "day of the sun") is the day of the week between
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 0xe18d94f78127ef09f0dc7933452c80631e80864ff7a1c72ce9289d4592b43478. 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/50e3ad1e-8a76-4260-88b0-01978296e245.json and https://artists.proofprofile.net/proofs/artist/50e3ad1e-8a76-4260-88b0-01978296e245.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).