Blockchain

Why does switching to a private mempool still leave me open to sandwich attacks?

Oportunidad

Private and encrypted mempools now route more than half of Ethereum transactions, but encrypting a transaction does not hide everything a searcher needs. The trading pair, the direction of a swap, and a coarse size range can be inferred from surrounding chain state and timing metadata even when the transaction bytes are fully encrypted. A paper accepted at NeurIPS 2026 derives exact leakage thresholds at which this partial information remains sufficient to run a profitable sandwich attack against users who believe they are protected. The result is a false safety assumption: users opt into private relays and stop worrying, while searchers adapt their strategies to the residual signal that leaks through. There is no production tooling today that lets a user measure how much information their transaction leaks before they submit it, so the protection is unauditable.

Por qué importa

Encryption is not privacy if the residual observable signal is enough to attack, and the first tool that quantifies per-transaction leakage turns privacy from a claim into a verifiable property.

Cómo evalúo la oportunidad

La Puntuación de Oportunidad es mi propia lectura, no una medición: cuánto duele, con qué frecuencia aparece y qué tan poco existe para resolverlo hoy. Un valor más alto significa que creo que vale más la pena construirlo.

Gravedad7/10

Cuánto dolor causa cuando aparece.

Frecuencia8/10

Con qué frecuencia la gente se topa con ello.

Espacio en blanco9/10

Qué tan pocas herramientas buenas existen para ello hoy.