{"id":12047,"date":"2026-08-18T18:39:14","date_gmt":"2026-08-18T18:39:14","guid":{"rendered":"https:\/\/cryptonews.uk.com\/?p=12047"},"modified":"2026-08-18T18:39:14","modified_gmt":"2026-08-18T18:39:14","slug":"ethereum-developers-move-to-close-the-loophole-sandwich-bots-exploit","status":"publish","type":"post","link":"https:\/\/cryptonews.uk.com\/?p=12047","title":{"rendered":"Ethereum developers move to close the loophole sandwich bots exploit"},"content":{"rendered":"

<\/p>\n

\n

Ethereum developers are weighing a new defense against predatory trading bots that exploit pending transactions before they reach the blockchain.<\/p>\n

The problem stems from Ethereum\u2019s public mempool, 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

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

While estimates suggest losses from such attacks have declined from earlier peaks, the problem has not disappeared. In April, Ethereum co-founder Vitalik Buterin was himself targeted when the notorious Jaredfromsubway.eth bot front-ran and back-ran a small swap from one of his addresses.<\/p>\n

\n
\"Crypto\"Crypto<\/div>\n
Related Reading<\/span><\/p>\n

Crypto privacy has turned into an economic crisis as MEV bots siphon millions and most users still leak everything<\/h3>\n

Confidential execution, encrypted mempools, and selective disclosure are rising, but the winners will be whoever makes privacy boring by default.<\/p>\n

Feb 17, 2026<\/span> \u00b7<\/span> Gino Matos<\/span><\/p>\n<\/div><\/div>\n

Developers are now exploring whether encryption can remove the informational advantage that makes those attacks possible.<\/p>\n

Protocol researchers are scheduled to discuss the issue during an Aug. 19 \u201cEncrypt the Mempool\u201d call, where they will examine proposals designed to conceal transaction contents until their position in a block has already been committed.<\/p>\n

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

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

One leading proposal is EIP-8184, 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

While that design closes one avenue for exploitation, it also creates another problem Ethereum developers have yet to solve.<\/p>\n

The decryption dilemma<\/h2>\n

A fully enshrined encryption scheme would need to satisfy a difficult set of constraints at Ethereum’s scale.<\/p>\n

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

They say no known cryptographic construction currently satisfies the entire set at Ethereum’s scale.<\/p>\n

\"Flow\"Flow<\/p>\n

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

The design also creates financial liabilities.<\/p>\n

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

\n
\n
CryptoSlate Daily Brief<\/span><\/p>\n

Daily signals, zero noise.<\/h3>\n

Market-moving headlines and context delivered every morning in one tight read.<\/p>\n

5-minute digest<\/span> 100k+ readers<\/span><\/p>\n<\/div>\n

\n

Free. No spam. Unsubscribe any time.<\/p>\n

Whoops, looks like there was a problem. Please try again.<\/span><\/p>\n

You\u2019re subscribed. Welcome aboard.<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n

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

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

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

Trading intermediaries and network scaling<\/h2>\n

Wednesday’s agenda will ask developers whether a temporary, non-post-quantum cryptographic solution is acceptable.<\/p>\n

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

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

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

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

Any production deployment would also need to coordinate with Ethereum’s broader roadmap. LUCID is designed to extend the inclusion-list pipeline associated with FOCIL, or EIP-7805, which gives multiple validators a role in identifying transactions a builder must include.<\/p>\n

Ethereum’s security roadmap currently targets FOCIL as a consensus-layer priority for the Hegot\u00e1 upgrade in 2027, while broader post-quantum infrastructure milestones sit further out.<\/p>\n

\n
\"As\"As<\/div>\n
Related Reading<\/span><\/p>\n

As quantum \u2018Q-Day’ jumps to 2029, Ethereum faces a new fight over what to do with coins left in old wallets<\/h3>\n

The Ethereum Foundation\u2019s post-quantum roadmap argues that the real danger is a years-long struggle over how to move user wallets.<\/p>\n

Mar 26, 2026<\/span> \u00b7<\/span> Gino Matos<\/span><\/p>\n<\/div><\/div>\n<\/div>\n

Featured,Privacy,Technology,Trading,ethereumethereum#Ethereum #developers #move #close #loophole #sandwich #bots #exploit1787078354<\/p>\n","protected":false},"excerpt":{"rendered":"

Ethereum developers are weighing a new defense against predatory trading bots that exploit pending transactions before they reach the blockchain. The problem stems from Ethereum\u2019s public mempool, 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<\/p>\n","protected":false},"author":1,"featured_media":12048,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[1739,2000,1337,31,664,1191,302,6335],"class_list":["post-12047","post","type-post","status-publish","format-standard","has-post-thumbnail","category-ethereum","tag-bots","tag-close","tag-developers","tag-ethereum","tag-exploit","tag-loophole","tag-move","tag-sandwich"],"yoast_head":"\nEthereum developers move to close the loophole sandwich bots exploit - Crypto News: Latest Cryptocurrency News and Analysis<\/title>\n<meta name=\"description\" content=\"A new Ethereum mempool design could prevent bots from seeing profitable trades before they execute while preserving public access to blockspace.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cryptonews.uk.com\/?p=12047\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ethereum developers move to close the loophole sandwich bots exploit\" \/>\n<meta property=\"og:description\" content=\"A new Ethereum mempool design could prevent bots from seeing profitable trades before they execute while preserving public access to blockspace.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/cryptonews.uk.com\/?p=12047\" \/>\n<meta property=\"og:site_name\" content=\"Crypto News: Latest Cryptocurrency News and Analysis\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-18T18:39:14+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/08\/ethereum-sealed-key-risk.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"\u884c\u653f\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u884c\u653f\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/cryptonews.uk.com\/?p=12047\",\"url\":\"https:\/\/cryptonews.uk.com\/?p=12047\",\"name\":\"Ethereum developers move to close the loophole sandwich bots exploit - Crypto News: Latest Cryptocurrency News and Analysis\",\"isPartOf\":{\"@id\":\"https:\/\/cryptonews.uk.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/cryptonews.uk.com\/?p=12047#primaryimage\"},\"image\":{\"@id\":\"https:\/\/cryptonews.uk.com\/?p=12047#primaryimage\"},\"thumbnailUrl\":\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/08\/ethereum-sealed-key-risk.jpg\",\"datePublished\":\"2026-08-18T18:39:14+00:00\",\"author\":{\"@id\":\"https:\/\/cryptonews.uk.com\/#\/schema\/person\/822778c5844e0d16d43dce6630f4f1bf\"},\"description\":\"A new Ethereum mempool design could prevent bots from seeing profitable trades before they execute while preserving public access to blockspace.\",\"breadcrumb\":{\"@id\":\"https:\/\/cryptonews.uk.com\/?p=12047#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/cryptonews.uk.com\/?p=12047\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/cryptonews.uk.com\/?p=12047#primaryimage\",\"url\":\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/08\/ethereum-sealed-key-risk.jpg\",\"contentUrl\":\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/08\/ethereum-sealed-key-risk.jpg\",\"width\":1280,\"height\":720},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/cryptonews.uk.com\/?p=12047#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/cryptonews.uk.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Ethereum developers move to close the loophole sandwich bots exploit\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/cryptonews.uk.com\/#website\",\"url\":\"https:\/\/cryptonews.uk.com\/\",\"name\":\"Crypto News: Latest Cryptocurrency News and Analysis\",\"description\":\"Latest Crypto & Bitcoin News\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/cryptonews.uk.com\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/cryptonews.uk.com\/#\/schema\/person\/822778c5844e0d16d43dce6630f4f1bf\",\"name\":\"\u884c\u653f\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/cryptonews.uk.com\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/e4c2d23409b09e004cef3facbe677e95c5401f9e29680f3a311e0130c5748089?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/e4c2d23409b09e004cef3facbe677e95c5401f9e29680f3a311e0130c5748089?s=96&d=mm&r=g\",\"caption\":\"\u884c\u653f\"},\"sameAs\":[\"http:\/\/demo3.aiwalls.com\/coinbase\"],\"url\":\"https:\/\/cryptonews.uk.com\/?author=1\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Ethereum developers move to close the loophole sandwich bots exploit - Crypto News: Latest Cryptocurrency News and Analysis","description":"A new Ethereum mempool design could prevent bots from seeing profitable trades before they execute while preserving public access to blockspace.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/cryptonews.uk.com\/?p=12047","og_locale":"en_US","og_type":"article","og_title":"Ethereum developers move to close the loophole sandwich bots exploit","og_description":"A new Ethereum mempool design could prevent bots from seeing profitable trades before they execute while preserving public access to blockspace.","og_url":"https:\/\/cryptonews.uk.com\/?p=12047","og_site_name":"Crypto News: Latest Cryptocurrency News and Analysis","article_published_time":"2026-08-18T18:39:14+00:00","og_image":[{"width":1280,"height":720,"url":"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/08\/ethereum-sealed-key-risk.jpg","type":"image\/jpeg"}],"author":"\u884c\u653f","twitter_card":"summary_large_image","twitter_misc":{"Written by":"\u884c\u653f","Est. reading time":"5 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/cryptonews.uk.com\/?p=12047","url":"https:\/\/cryptonews.uk.com\/?p=12047","name":"Ethereum developers move to close the loophole sandwich bots exploit - Crypto News: Latest Cryptocurrency News and Analysis","isPartOf":{"@id":"https:\/\/cryptonews.uk.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/cryptonews.uk.com\/?p=12047#primaryimage"},"image":{"@id":"https:\/\/cryptonews.uk.com\/?p=12047#primaryimage"},"thumbnailUrl":"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/08\/ethereum-sealed-key-risk.jpg","datePublished":"2026-08-18T18:39:14+00:00","author":{"@id":"https:\/\/cryptonews.uk.com\/#\/schema\/person\/822778c5844e0d16d43dce6630f4f1bf"},"description":"A new Ethereum mempool design could prevent bots from seeing profitable trades before they execute while preserving public access to blockspace.","breadcrumb":{"@id":"https:\/\/cryptonews.uk.com\/?p=12047#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/cryptonews.uk.com\/?p=12047"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/cryptonews.uk.com\/?p=12047#primaryimage","url":"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/08\/ethereum-sealed-key-risk.jpg","contentUrl":"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/08\/ethereum-sealed-key-risk.jpg","width":1280,"height":720},{"@type":"BreadcrumbList","@id":"https:\/\/cryptonews.uk.com\/?p=12047#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/cryptonews.uk.com\/"},{"@type":"ListItem","position":2,"name":"Ethereum developers move to close the loophole sandwich bots exploit"}]},{"@type":"WebSite","@id":"https:\/\/cryptonews.uk.com\/#website","url":"https:\/\/cryptonews.uk.com\/","name":"Crypto News: Latest Cryptocurrency News and Analysis","description":"Latest Crypto & Bitcoin News","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/cryptonews.uk.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/cryptonews.uk.com\/#\/schema\/person\/822778c5844e0d16d43dce6630f4f1bf","name":"\u884c\u653f","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/cryptonews.uk.com\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/e4c2d23409b09e004cef3facbe677e95c5401f9e29680f3a311e0130c5748089?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/e4c2d23409b09e004cef3facbe677e95c5401f9e29680f3a311e0130c5748089?s=96&d=mm&r=g","caption":"\u884c\u653f"},"sameAs":["http:\/\/demo3.aiwalls.com\/coinbase"],"url":"https:\/\/cryptonews.uk.com\/?author=1"}]}},"_links":{"self":[{"href":"https:\/\/cryptonews.uk.com\/index.php?rest_route=\/wp\/v2\/posts\/12047","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cryptonews.uk.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cryptonews.uk.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cryptonews.uk.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cryptonews.uk.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=12047"}],"version-history":[{"count":0,"href":"https:\/\/cryptonews.uk.com\/index.php?rest_route=\/wp\/v2\/posts\/12047\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cryptonews.uk.com\/index.php?rest_route=\/wp\/v2\/media\/12048"}],"wp:attachment":[{"href":"https:\/\/cryptonews.uk.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=12047"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cryptonews.uk.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12047"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cryptonews.uk.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12047"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}