Mayrllon de Castro Souza (born 25 February 2004), better known by his stage name Léo Foguete (), is a Brazilian singer and songwriter. He rose to prominence in 2024 for the song "Última Noite", which
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a9066f1b1047e403096831c3a0e62592e29500fa6e0c83d43e4231e724bd4f. Chain 2 (Bitcoin): anchored in block 954032 (2026-06-17T01:59:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3bc05c26-5677-4b95-8331-84fe1f5799ff.json and https://artists.proofprofile.net/proofs/artist/3bc05c26-5677-4b95-8331-84fe1f5799ff.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).