Oscar Jay was a French archer. He competed at the 1908 Summer Olympics in London. Jay entered the Men's Continental Style event in 1908, taking 17th (and last) place with 134 points. References Sou
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 0x506453331521ae5038d6c03f5c8dcb2f5ffd6292da8eb76118e63e4e9b710ac3. Chain 2 (Bitcoin): anchored in block 953907 (2026-06-16T07:39:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/16d66ebe-ba6b-4575-8c19-6bb6cfabe1cb.json and https://artists.proofprofile.net/proofs/artist/16d66ebe-ba6b-4575-8c19-6bb6cfabe1cb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).