Rodrigo Octávio Coelho da Rocha e Castro (born 21 December 1978 in Belo Horizonte, Minas Gerais) is a freestyle swimmer from Brazil, who competed for his native country at three consecutive Summer Oly
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 0xa28a47bf2f4038998d59263adc9b352b3cded73b0c6c0eab507d2ac3ed3ce41f. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c2fe30f5-5d1f-43af-b55b-f71626f95ea4.json and https://artists.proofprofile.net/proofs/artist/c2fe30f5-5d1f-43af-b55b-f71626f95ea4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).