Echidna, developed by Trail of Bits, is an advanced Ethereum smart contract fuzzer that stands out for its innovative approach called ‘property-based fuzzing’. Unlike traditional fuzzers that focus on identifying crashes, Echidna aims to disprove user-defined invariants or properties.

With Echidna, users have access to a wide range of tools to create custom analyses for intricate contracts. Specifically designed for EVM bytecode, Echidna utilizes cryptic compile to thoroughly test contracts.