Developer practices such as hardcoded keys and test accounts left in production code create systemic security weaknesses that expose Ethereum users to fund loss.

"Externally Owned Account misuse involves addresses whose private keys are exposed or show strong onchain signs of compromised control. More than 95% of EOA misuse losses came from the GitHub exposed-key subtype."

"Developers should keep test accounts and hardcoded keys out of production, while wallet providers can warn before transactions reach no-code or exposed-key destinations."