upright=1.55|thumb|Emperor Xuan Zong (Li Longji) (685–762) __NOTOC__ Year 730 (DCCXXX) was a common year starting on Sunday of the Julian calendar. The denomination 730 for this year has been used sin
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 0xf54361da005153117701f92b279b4d3e61fbf87dd923ab4c550964f046215391. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/41026b07-cbce-48c0-ae39-d4cad5da39eb.json and https://artists.proofprofile.net/proofs/artist/41026b07-cbce-48c0-ae39-d4cad5da39eb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).