thumb|Sacrificial offering placed on three sides (Katori Jingu) thumb|Sanpo with pine tree decorations and lobsters for New Year's Day. Painted by Shuntei Katsukawa, circa 1815. is a stand used in Sh
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 0x168c0903ac9834eec2bb29cf6c164afd045fdf7566243fa0ed8a2c2dd958344d. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e03eaf91-aad3-4d93-b0dc-c35f60ccf9b6.json and https://artists.proofprofile.net/proofs/artist/e03eaf91-aad3-4d93-b0dc-c35f60ccf9b6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).