Leonard Walter Carter (born 21 November 1942) is a former British sprinter. Biography Carter finished third behind Seraphino Antao in the 2220 yards event at the 1962 AAA Championships. Later that
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 0xa4f59dd980c1fdc083b34faa3b25f5ba00b896f98899ff5adeb4f21c73e2608c. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b03c0087-057b-46f6-b72f-94069979afa8.json and https://artists.proofprofile.net/proofs/artist/b03c0087-057b-46f6-b72f-94069979afa8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).