Etherscan launched Flow, a new AI-powered tool as part of its Build with AI suite, enabling users to trace, verify, and visualize onchain money flows across over 60 EVM-compatible chains. The tool was immediately stress-tested during the RedSonic Vault exploit around September 5, 2026, when an attacker used a flash loan to drain approximately 9.25 ETH, worth roughly $23,000, in a single transaction. The attack exploited a flaw in RedSonic’s permissionless registerErc20() function, allowing the attacker to register stETH in a way that double-counted the same collateral. Security researchers used Flow to trace the attacker’s wallet and the vault contract, mapping out each step of the exploit in a shareable format. By embedding tracing capabilities directly into developer workflows and AI agent frameworks, Etherscan Flow aims to democratize access to this type of analysis.
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