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Echidna is a cryptocurrency security tool used for smart contract testing and analysis on the Ethereum blockchain. Developed by ChainSafe Systems, Echidna employs fuzz testing techniques to generate random test cases and transactions, helping developers and auditors identify vulnerabilities and ensure the robustness of smart contracts. It plays a vital role in enhancing the security and reliability of Ethereum-based decentralized applications (DApps) by systematically testing their behavior under various conditions.