Matheus Rodrigues Cézar da Silva (born 3 October 1996) is a Brazilian futsal player who plays for FC Barcelona and the Brazilian national futsal team as a winger. References External links Liga Naci
{"copyright_id":"0x28fb85e103b92377e58cb87c0e73a22810e59daa706dededea7bfe40682c0ad3","name":"Matheus Rodrigues","registered_at":"2026-06-15T03:26:35Z","symbol":"NIM0667335","token_address":"0xc9b6fde0fee5c7cfdeb1dbc37de6ad0c32dadedf","type":"artist","uuid":"da0f0ee9-c0d4-4b66-a58e-67ca0bbe2a2a"}
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 0x28fb85e103b92377e58cb87c0e73a22810e59daa706dededea7bfe40682c0ad3. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da0f0ee9-c0d4-4b66-a58e-67ca0bbe2a2a.json and https://artists.proofprofile.net/proofs/artist/da0f0ee9-c0d4-4b66-a58e-67ca0bbe2a2a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).