Renan Santos de Castro (born 8 September 1995) is a Brazilian footballer who plays as a left-back for Água Santa. Career Born in Rio de Janeiro, Castro began his career with Ituano, making his senior
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 0xe50269c2f72ef640c7b1c7e79d1bbf149b407df6a7ba679034d35c983db25bc4. Chain 2 (Bitcoin): anchored in block 953961 (2026-06-16T14:58:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/27c040ed-8daa-4bc9-8da2-438cb9d7b9e8.json and https://artists.proofprofile.net/proofs/artist/27c040ed-8daa-4bc9-8da2-438cb9d7b9e8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).