Javier Crespo is a Spanish SB9 classified swimmer who has represented Spain at the 2004, 2008 and 2012 Summer Paralympics. Personal Crespo is from Madrid. In September 2012, he was honored at his
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 0x1d95e2566da9a9723a5d98844d989787501f847ca814f0c29648bdc420e76762. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/58584249-8aba-4a39-af92-e647862af302.json and https://artists.proofprofile.net/proofs/artist/58584249-8aba-4a39-af92-e647862af302.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).