Aptos rolls out Encrypted Mempool to curb frontrunning, sandwich attacks
The optional feature hides transaction details until their order is finalized, preventing bots from exploiting pending trades.
Layer-1 blockchain Aptos has introduced an optional Encrypted Mempool feature to protect traders from MEV attacks such as frontrunning and sandwich attacks. The feature, now live on Aptos mainnet, allows users to opt-in to encrypt pending transactions until their block ordering is finalized. This prevents bots from exploiting pending trades by observing the transaction details before execution.
By encrypting the transaction contents on the user's device, sensitive information like assets, amounts, and called functions remain hidden while the sender's address and gas fee remain visible. Once the ordering is finalized, validators collectively decrypt the transactions, ensuring no single validator can decrypt a pending transaction on its own.
The feature comes with a minimum gas price at twice the network's base minimum and adds around 20 milliseconds per block in tests. Aptos joins other networks like Gnosis Chain and Ethereum's Flashbots Protect that offer similar MEV protection.
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