Christopher Scott Kyle (April 8, 1974 – February 2, 2013) was a United States Navy SEAL sniper. He served four tours in the Iraq War and was awarded the Global War on Terrorism Service Medal, National
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 0xf6f5bcf628d01d6db894a2d584947a0a0b53f05f44d09c1ca923bdb80b567a64. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8cccdedd-4d5a-4f60-8062-11d420c6959b.json and https://artists.proofprofile.net/proofs/artist/8cccdedd-4d5a-4f60-8062-11d420c6959b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
American Sniper (Die Geschichte des Scharfschützen Chris Kyle)