---
id: 1647
title: "Fuzzing on-chain contracts with Echidna"
source_domain: blog.trailofbits.com
source_url: "https://blog.trailofbits.com/2023/07/21/fuzzing-on-chain-contracts-with-echidna/"
published_at: "2023-07-21T11:00:31Z"
tags: ["web3", "smart-contracts", "fuzzing", "blockchain", "trail-of-bits", "ethereum", "echidna", "exploit-reproduction"]
phying_url: "https://phying.com/item/1647"
lang: en
---

# Fuzzing on-chain contracts with Echidna

## Summary

Echidna 2.1.0 adds direct on-chain data retrieval, letting security engineers fuzz deployed Ethereum smart contracts in their live state and reproduce real-world exploits like the Stax Finance hack.

## Intelligence Metadata

- **Sources:** blog.trailofbits.com
- **Published:** 2023-07-21T11:00:31Z
- **Original:** https://blog.trailofbits.com/2023/07/21/fuzzing-on-chain-contracts-with-echidna/
- **Phying News:** https://phying.com/item/1647