{"id":555877,"date":"2026-08-18T18:50:20","date_gmt":"2026-08-18T17:50:20","guid":{"rendered":"https:\/\/cryptoslate.com\/?p=555877"},"modified":"2026-08-18T13:52:44","modified_gmt":"2026-08-18T12:52:44","slug":"ethereum-wants-to-hide-your-trades-from-bots-before-they-can-attack","status":"publish","type":"post","link":"https:\/\/cryptoslate.com\/ethereum-wants-to-hide-your-trades-from-bots-before-they-can-attack\/","title":{"rendered":"Ethereum wants to hide your trades from bots before they can attack"},"content":{"rendered":"<p><a href=\"https:\/\/cryptoslate.com\/coins\/ethereum\/\">Ethereum<\/a> developers are weighing a new defense against predatory trading bots that exploit pending transactions before they reach the blockchain.<\/p>\n<p>The problem stems from <a href=\"https:\/\/cryptoslate.com\/how-cryptos-biggest-problem-the-trilemma-was-finally-solved-and-why-bitcoin-should-pay-attention\/\">Ethereum\u2019s public mempool,<\/a> a transparent waiting room where transactions can be inspected before execution. That visibility lets automated traders spot profitable orders and place their own transactions around them, extracting value from users before a trade settles.<\/p>\n<p>The practice has become most closely associated with sandwich attacks. A bot spots a pending swap, buys the same asset first to move the price against the user, then sells immediately after the victim\u2019s trade executes at the worse price.<\/p>\n<p>While estimates suggest losses from such attacks have declined from earlier peaks, the problem has not disappeared. In April, Ethereum co-founder <a href=\"https:\/\/cryptoslate.com\/people\/vitalik-buterin\/\">Vitalik Buterin<\/a> was himself targeted when the notorious <a href=\"https:\/\/cryptoslate.com\/jaredfromsubway-mev-bot-drained\/\">Jaredfromsubway.eth bot front-ran<\/a> and back-ran a small swap from one of his addresses.<\/p>\n\n<div class=\"cs-article-embed\">\n    <a href=\"https:\/\/cryptoslate.com\/ethereum-bots-are-burning-over-50-of-gas-fees-so-eth-now-needs-privacy-just-to-scale\/\" class=\"cs-article-embed__link\">\n        <div class=\"cs-article-embed__body\">\n            <span class=\"cs-article-embed__related-reading\">Related Reading<\/span>\n            <h3 class=\"cs-article-embed__title\">Crypto privacy has turned into an economic crisis as MEV bots siphon millions and most users still leak everything<\/h3>\n        <\/div>\n        <span class=\"cs-article-embed__arrow\" aria-hidden=\"true\">\n            <i class=\"fa-light fa-arrow-up-right\"><\/i>\n        <\/span>\n    <\/a>\n<\/div>\n\n<p>Developers are now exploring whether encryption can remove the informational advantage that makes those attacks possible.<\/p>\n<p>Protocol researchers are scheduled to discuss the issue during an Aug. 19 \u201c<a href=\"https:\/\/github.com\/ethereum\/pm\/issues\/2193\">Encrypt the Mempool\u201d call,<\/a> where they will examine proposals designed to conceal transaction contents until their position in a block has already been committed.<\/p>\n<p>The effort targets a long-running tradeoff for Ethereum users. Traders can already bypass the public mempool by routing transactions through private relays, reducing their exposure to front-running. But that protection comes with dependence on intermediaries that control transaction inclusion and availability.<\/p>\n<p>An encrypted public mempool would attempt to preserve permissionless access to blockspace while preventing builders and bots from seeing the underlying trade before its ordering is fixed.<\/p>\n<p>One leading proposal is <a href=\"https:\/\/eips.ethereum.org\/EIPS\/eip-8184\">EIP-8184,<\/a> known as LUCID. The draft would require block builders to commit to sealed transactions containing a chargeable ticket and encrypted payload without knowing what the transaction does. Only after the commitment is made would the sender, or an off-protocol key publisher, release the information needed to decrypt it.<\/p>\n<p>While that design closes one avenue for exploitation, it also creates another problem Ethereum developers have yet to solve.<\/p>\n<h2>The decryption dilemma<\/h2>\n<p>A fully enshrined encryption scheme would need to satisfy a difficult set of constraints at Ethereum's scale.<\/p>\n<p>EIP-8184's authors list small public keys, non-interactive decryption, no trusted setup, practical ciphertext sizes, strong chosen-ciphertext security and a credible route to quantum safety among the requirements.<\/p>\n<p>They say no known cryptographic construction currently satisfies the entire set at Ethereum's scale.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-555892\" src=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/08\/exec-8a666766-e86d-4f6a-874f-51d8d0005a0c.png\" alt=\"Flow diagram showing LUCID sealing, committing, revealing and executing encrypted Ethereum transactions, with design limits and unresolved key-publisher trust risks.\" width=\"720\" height=\"900\" srcset=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/08\/exec-8a666766-e86d-4f6a-874f-51d8d0005a0c.png 1122w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/08\/exec-8a666766-e86d-4f6a-874f-51d8d0005a0c-240x300.png 240w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/08\/exec-8a666766-e86d-4f6a-874f-51d8d0005a0c-819x1024.png 819w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/08\/exec-8a666766-e86d-4f6a-874f-51d8d0005a0c-768x960.png 768w\" sizes=\"(max-width: 720px) 100vw, 720px\" \/><\/p>\n<p>LUCID therefore leaves the decryption construction outside the core protocol, allowing senders to manage their own key release or follow instructions from a key publisher. That preserves flexibility for stronger cryptography later, but EIP-8184's security considerations explicitly make publisher selection part of the user's security model.<\/p>\n<p>The design also creates financial liabilities.<\/p>\n<p>If a key is withheld or fails to arrive on schedule, LUCID's initial draft leaves the protocol-level penalty for a failed multi-key reveal with the transaction sender rather than automatically transferring it to the third-party key provider.<\/p>\n<p>To put an economic cost on failed reveals, LUCID caps its encrypted top-of-block segment at one-eighth of the block gas limit and uses a reservation fee. Most of that amount can be returned after successful decryption, while the full reservation can be lost when the reveal fails.<\/p>\n<p>That makes failed or selective releases expensive, but it cannot establish why a key failed to arrive or determine whether a publisher deliberately leaked it early.<\/p>\n<p>The authors have described an off-protocol sponsorship arrangement where a publisher funds a transaction inside the bundle and absorbs the loss if it remains sealed. Ethereum itself would not enforce that pledge.<\/p>\n<h2>Trading intermediaries and network scaling<\/h2>\n<p>Wednesday's agenda will ask developers whether a temporary, non-post-quantum cryptographic solution is acceptable.<\/p>\n<p>It also targets the deeper enforcement problem: how withholding or early key selling by members of a validator whitelist could be proved and whether those proofs could be automated.<\/p>\n<p>A whitelist can establish who is authorized to publish keys. It cannot by itself distinguish deliberate misconduct from software failure, network latency, or a missed deadline.<\/p>\n<p>An alternative proposal, EIP-8105, uses a directed trust graph where registered providers identify other providers they trust. Providers can establish their own withholding conditions, leaving incentives, reliability systems, and potential punishment mechanisms outside Ethereum's consensus rules.<\/p>\n<p>Other approaches introduce their own costs. Threshold decryption distributes control among multiple participants but adds timing pressure. Trusted hardware can shorten the path to a key while introducing new hardware and operator dependencies.<\/p>\n<p>Any production deployment would also need to coordinate with Ethereum's broader roadmap. LUCID is designed to extend the inclusion-list pipeline associated with <a href=\"https:\/\/eips.ethereum.org\/EIPS\/eip-7805\">FOCIL, or EIP-7805,<\/a> which gives multiple validators a role in identifying transactions a builder must include.<\/p>\n<p>Ethereum's security roadmap currently targets FOCIL as a consensus-layer priority for <a href=\"https:\/\/cryptoslate.com\/ethereums-next-major-upgrade-just-slipped-to-late-2026-forcing-a-two-week-scramble-to-save-its-2027-roadmap\/\">the Hegot\u00e1 upgrade in 2027,<\/a> while broader post-quantum infrastructure milestones sit further out.<\/p>\n\n<div class=\"cs-article-embed\">\n    <a href=\"https:\/\/cryptoslate.com\/as-quantum-q-day-jumps-to-2029-ethereum-faces-a-new-fight-over-what-to-do-with-coins-left-in-old-wallets\/\" class=\"cs-article-embed__link\">\n        <div class=\"cs-article-embed__body\">\n            <span class=\"cs-article-embed__related-reading\">Related Reading<\/span>\n            <h3 class=\"cs-article-embed__title\">As quantum &#8216;Q-Day' jumps to 2029, Ethereum faces a new fight over what to do with coins left in old wallets<\/h3>\n        <\/div>\n        <span class=\"cs-article-embed__arrow\" aria-hidden=\"true\">\n            <i class=\"fa-light fa-arrow-up-right\"><\/i>\n        <\/span>\n    <\/a>\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>LUCID could hide MEV-sensitive orders before commitment, but Ethereum lacks protocol rules for proving or policing key-publisher abuse.<\/p>\n","protected":false},"author":720,"featured_media":555999,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77968,61045,37,6849],"tags":[72190],"prediction_market_topic":[],"post_folder":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.9 (Yoast SEO v21.9.1) - 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