is a Japanese dish made with chilled tofu and toppings. Variety of toppings thumb|Hiyayakko topped with katsuobushi, grated ginger and chopped green onion The choice of toppings on the tofu vary a
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 0x4cd65e7cea061eab5ec674d7969e4a8fb69fdd413eee0f3e88e6ef0d03881334. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9ca88f64-10fe-40e2-aedb-c5a4a8306580.json and https://artists.proofprofile.net/proofs/artist/9ca88f64-10fe-40e2-aedb-c5a4a8306580.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).