thumb|254x254px|A kamikaze attack aircraft crashes into a US naval warship, May 1945. , officially , were a part of the Japanese Special Attack Units of military aviators who flew suicide attacks for
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc183f7ff3ae47ca758b5a2b7938a574c7634352914a0285c31714163df0040d. Chain 2 (Bitcoin): anchored in block 953847 (2026-06-15T22:51:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/00fea6fe-89f7-4dbe-8d2b-85e3ea8c44e8.json and https://artists.proofprofile.net/proofs/artist/00fea6fe-89f7-4dbe-8d2b-85e3ea8c44e8.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.