The Diamond League is an annual series of elite track and field athletic competitions comprising fifteen invitational athletics meetings. The series sits in the top tier of the World Athletics one-day
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 0xa7651d60ac1259428fd051ae02a64347157be3dad3a43bf2d8a4a81b30d0a27d. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9e6171fb-9810-4ce8-8c42-2f187188ceff.json and https://artists.proofprofile.net/proofs/artist/9e6171fb-9810-4ce8-8c42-2f187188ceff.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.