We’re excited to release IDL Guesser - an open-source CLI that rips the IDL out of any closed-source Anchor program ! Blog: Code: The Gap: about half of the top-100 Solana programs ship with no IDL. Can’t decode transactions, fuzzers stall, auditors waste hours reverse-engineering How it works: • Finds sol_log("Instruction: …") in the ELF • Walks Anchor’s try_accounts control-flow graph to map signers & mutables info Brute-probes arg sizes, recalculates 8-byte discriminators • Spits out ready-to-use JSON. Early testing shows the tool recovers the vast majority of instructions. The tool just won 1st prize at Reverse Engineering Closed Source Solana Programs hackathon hosted by Accretion. Try it now -