Aptos Proposes Encrypted Mempool to Protect Trades from Frontrunning

Aptos Labs has unveiled a proposal for an encrypted mempool designed to protect pending trades from frontrunning. The feature would conceal trade instructions until validators complete transaction ordering, with tests showing an added latency of 27 milliseconds, or 14% more than the baseline system. Aptos claims this would be the first layer-1 blockchain to offer native protection against orderflow leakage and MEV if approved by governance.

The encrypted mempool would allow users to submit transactions without exposing their contents, with validators revealing the encrypted instructions after ordering. Completed transactions would still be recorded publicly. The system uses batched decryption to limit processing burdens, with validators sharing control of the decryption key during each epoch. Research published in November 2025 details the integration of encrypted mempools with a high-performance Byzantine fault-tolerant consensus protocol.

Aptos has committed over $50 million to products, research, and trading infrastructure, including support for exchanges like Decibel. The network reported cumulative trading volume exceeding $1 billion by May 2026, with stablecoin market capitalization peaking at $1.93 billion. Institutional activity, such as DigiShares' tokenization integration, adds context to Aptos' ecosystem funding commitments.

The proposal addresses visible transaction contents before ordering, which the researchers identify as the mechanism behind frontrunning and sandwich trades. The system aims to preserve confidentiality during ordering while maintaining performance comparable to leading consensus designs.