{"id":13986,"date":"2026-10-02T06:16:47","date_gmt":"2026-10-02T06:16:47","guid":{"rendered":"https:\/\/cryptonews.uk.com\/?p=13986"},"modified":"2026-10-02T06:16:47","modified_gmt":"2026-10-02T06:16:47","slug":"electrum-patches-lightning-flaw-but-old-bitcoin-backups-break","status":"publish","type":"post","link":"https:\/\/cryptonews.uk.com\/?p=13986","title":{"rendered":"Electrum patches Lightning flaw, but old Bitcoin backups break"},"content":{"rendered":"<p><\/p>\n<div data-cs-editorial-figure-scope=\"\" data-cs-editorial-quote-scope=\"\" data-cs-image-viewer-scope=\"\" data-single-article-content=\"\">\n<p>Electrum\u2019s latest security update fixes a Lightning backup defect, but some Bitcoin wallet users still need to replace saved backups.<\/p>\n<p>Older backups from wallets with non-deterministic Lightning keys lack information needed to reclaim funds from anchor channels, a Lightning channel type, after a remote close.<\/p>\n<p>Version 4.8.2, dated Sept. 11, remains the latest release listed on Electrum\u2019s official website as of Oct. 1.<\/p>\n<p>The individual-backup fix adds payment-key information needed to claim the user\u2019s balance from an anchor channel closed by the peer. Without that information, an affected backup lacks the key needed to sweep the output, meaning claim the coins on the Bitcoin blockchain.<\/p>\n<h2>Which wallets need attention?<\/h2>\n<p>Electrum\u2019s release notes define two conditions that must coincide: the wallet has non-deterministic Lightning keys, and the backup concerns an anchor channel.<\/p>\n<p>Non-deterministic keys cannot be recreated from the wallet\u2019s seed. The warning covers individual channel exports and exported full-wallet backups concerning Lightning recovery.<\/p>\n<p>Lightning wallets based on BIP39 seeds or imported extended private keys (xprvs) always have non-deterministic Lightning keys. Electrum-seed wallets differ: their Lightning keys are deterministic when the wallet file was created in version 4.1 or later. Files created in 4.0.x do not qualify merely because the software is now newer.<\/p>\n<p>On desktop, wallet information marks the Lightning channels as non-recoverable from the seed, while the channel-opening dialog warns that a channel cannot be recovered from the seed on Android. Anchor-channel use remains the additional condition for this backup defect.<\/p>\n<div class=\"cs-article-embed\">\n<p> <span class=\"cs-article-embed__related-reading\">Related Reading<\/span><\/p>\n<h3 class=\"cs-article-embed__title\">New Bitcoin proposal rescues locked multisig wallets \u2013 At a hidden cost<\/h3>\n<\/p>\n<p> <span class=\"cs-article-embed__arrow\" aria-hidden=\"true\"> <i class=\"fa-light fa-arrow-up-right\"\/> <\/span> <\/div>\n<p>The individual-backup fix also hides the option to request a remote force-close when the backup cannot sweep the resulting output. The restriction keeps that backup from requesting a close whose output it cannot claim.<\/p>\n<aside id=\"cs-inline-newsletter-1\" class=\"cs-inline-newsletter\" data-inline-newsletter=\"\" data-newsletter-placement=\"article-midpoint\" data-newsletter-pending-label=\"Joining\u2026\" data-newsletter-pending-status=\"Joining The Catalyst\u2026\" data-newsletter-email-required-message=\"Before sending, please provide your email address.\" aria-labelledby=\"cs-inline-newsletter-1-title\" aria-describedby=\"cs-inline-newsletter-1-copy\">\n<div class=\"cs-inline-newsletter__inner\">\n<div class=\"cs-inline-newsletter__content\"> <span class=\"cs-inline-newsletter__eyebrow\"> <i class=\"fa-regular fa-envelope\" aria-hidden=\"true\"\/> The Catalyst <\/span><\/p>\n<h2 id=\"cs-inline-newsletter-1-title\" class=\"cs-inline-newsletter__title\">What\u2019s moving crypto. Why it matters.<\/h2>\n<p id=\"cs-inline-newsletter-1-copy\" class=\"cs-inline-newsletter__copy\">Get CryptoSlate\u2019s essential stories and what to watch next.<\/p>\n<p>  <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\" fill=\"currentColor\" viewbox=\"0 0 16 16\" aria-hidden=\"true\" focusable=\"false\"> <path d=\"M15 3.604H1v1.891h14v-1.89ZM1 7.208V16l7-3.926L15 16V7.208zM15 0H1v1.89h14z\"\/> <\/svg> <span>Published on Substack<\/span> <\/div>\n<div class=\"cs-inline-newsletter__form-shell\">\n<p id=\"cs-inline-newsletter-1-privacy\" class=\"cs-inline-newsletter__privacy\">Seven days a week. Unsubscribe anytime.<\/p>\n<p> <i class=\"fa-regular fa-circle-xmark\" aria-hidden=\"true\"\/> <span>Whoops, looks like there was a problem. Please try again.<\/span><\/p>\n<div class=\"cs-inline-newsletter__success\" role=\"status\" aria-live=\"polite\" aria-atomic=\"true\" tabindex=\"-1\"> <span class=\"cs-inline-newsletter__success-icon\" aria-hidden=\"true\"\/><\/p>\n<div>\n<h3 class=\"cs-inline-newsletter__success-title\">Check your inbox.<\/h3>\n<p class=\"cs-inline-newsletter__success-copy\">Your signup request was sent. If confirmation is required, follow the email from Substack.<\/p>\n<p class=\"cs-inline-newsletter__success-hint\">Look in spam or promotions if you don\u2019t see it.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/aside>\n<p>PR 10851 repairs wallet-file exports by retaining a randomly generated Lightning private key that the export previously deleted. Maintainer SomberNight explains that re-enabling Lightning in such a backup would generate different keys, leaving its older channel-backup records insufficient to spend anchor-channel funds.<\/p>\n<figure id=\"attachment_568176\" aria-describedby=\"caption-attachment-568176\" style=\"width: 720px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" class=\"shoggoth-infographic shoggoth-infographic-portrait wp-image-568176\" src=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-4c84e0c1-d5b9-403b-8582-cbc656cc8081.png\" alt=\"Electrum 4.8.2 repairs Lightning backup exports, but old backups for anchor channels with non-deterministic Lightning keys still need replacing from retained original wallet data.\" width=\"720\" height=\"900\" srcset=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-4c84e0c1-d5b9-403b-8582-cbc656cc8081.png 1122w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-4c84e0c1-d5b9-403b-8582-cbc656cc8081-240x300.png 240w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-4c84e0c1-d5b9-403b-8582-cbc656cc8081-819x1024.png 819w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-4c84e0c1-d5b9-403b-8582-cbc656cc8081-768x960.png 768w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\"\/><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" class=\"lazyload shoggoth-infographic shoggoth-infographic-portrait wp-image-568176\" src=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-4c84e0c1-d5b9-403b-8582-cbc656cc8081.png\" alt=\"Electrum 4.8.2 repairs Lightning backup exports, but old backups for anchor channels with non-deterministic Lightning keys still need replacing from retained original wallet data.\" width=\"720\" height=\"900\" srcset=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-4c84e0c1-d5b9-403b-8582-cbc656cc8081.png 1122w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-4c84e0c1-d5b9-403b-8582-cbc656cc8081-240x300.png 240w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-4c84e0c1-d5b9-403b-8582-cbc656cc8081-819x1024.png 819w, https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/10\/exec-4c84e0c1-d5b9-403b-8582-cbc656cc8081-768x960.png 768w\" data-sizes=\"(max-width: 720px) 100vw, 720px\"\/><figcaption id=\"caption-attachment-568176\" class=\"wp-caption-text\">Electrum 4.8.2 fixes future backup exports, but old files may still need replacement.<\/figcaption><\/figure>\n<p>An upgrade changes the software that produces and reads backups. Electrum\u2019s documented remedy therefore requires fresh exports, and affected wallets display a startup warning.<\/p>\n<p>The replacement step depends on retaining the original wallet data needed for a fresh export. Installing newer software does not guarantee recovery of key material already lost with that data.<\/p>\n<\/div>\n<p>Featured,Lightning,Technology,Wallets,Bitcoin,BTC,paymentsBitcoin,BTC,payments#Electrum #patches #Lightning #flaw #Bitcoin #backups #break1790921807<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Electrum\u2019s latest security update fixes a Lightning backup defect, but some Bitcoin wallet users still need to replace saved backups. Older backups from wallets with non-deterministic Lightning keys lack information needed to reclaim funds from anchor channels, a Lightning channel type, after a remote close. Version 4.8.2, dated Sept. 11, remains the latest release listed<\/p>\n","protected":false},"author":1,"featured_media":13987,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[7235,91,2046,285,7234,382,2661,4426,167],"class_list":["post-13986","post","type-post","status-publish","format-standard","has-post-thumbnail","category-ethereum","tag-backups","tag-bitcoin","tag-break","tag-btc","tag-electrum","tag-flaw","tag-lightning","tag-patches","tag-payments"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.6 (Yoast SEO v26.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Electrum patches Lightning flaw, but old Bitcoin backups break - Crypto News: Latest Cryptocurrency News and Analysis<\/title>\n<meta name=\"description\" content=\"Electrum 4.8.2 fixes a Lightning backup flaw affecting anchor channels and requires some users to replace older backup files.\" \/>\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=13986\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Electrum patches Lightning flaw, but old Bitcoin backups break\" \/>\n<meta property=\"og:description\" content=\"Electrum 4.8.2 fixes a Lightning backup flaw affecting anchor channels and requires some users to replace older backup files.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/cryptonews.uk.com\/?p=13986\" \/>\n<meta property=\"og:site_name\" content=\"Crypto News: Latest Cryptocurrency News and Analysis\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-02T06:16:47+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/10\/electrum-backup-replacement-path.webp\" \/>\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\/webp\" \/>\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=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/cryptonews.uk.com\/?p=13986\",\"url\":\"https:\/\/cryptonews.uk.com\/?p=13986\",\"name\":\"Electrum patches Lightning flaw, but old Bitcoin backups break - Crypto News: Latest Cryptocurrency News and Analysis\",\"isPartOf\":{\"@id\":\"https:\/\/cryptonews.uk.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/cryptonews.uk.com\/?p=13986#primaryimage\"},\"image\":{\"@id\":\"https:\/\/cryptonews.uk.com\/?p=13986#primaryimage\"},\"thumbnailUrl\":\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/10\/electrum-backup-replacement-path.webp\",\"datePublished\":\"2026-10-02T06:16:47+00:00\",\"author\":{\"@id\":\"https:\/\/cryptonews.uk.com\/#\/schema\/person\/822778c5844e0d16d43dce6630f4f1bf\"},\"description\":\"Electrum 4.8.2 fixes a Lightning backup flaw affecting anchor channels and requires some users to replace older backup files.\",\"breadcrumb\":{\"@id\":\"https:\/\/cryptonews.uk.com\/?p=13986#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/cryptonews.uk.com\/?p=13986\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/cryptonews.uk.com\/?p=13986#primaryimage\",\"url\":\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/10\/electrum-backup-replacement-path.webp\",\"contentUrl\":\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/10\/electrum-backup-replacement-path.webp\",\"width\":1280,\"height\":720},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/cryptonews.uk.com\/?p=13986#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/cryptonews.uk.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Electrum patches Lightning flaw, but old Bitcoin backups break\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/cryptonews.uk.com\/#website\",\"url\":\"https:\/\/cryptonews.uk.com\/\",\"name\":\"Crypto News: Latest Cryptocurrency News and Analysis\",\"description\":\"Latest Crypto &amp; 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":"Electrum patches Lightning flaw, but old Bitcoin backups break - Crypto News: Latest Cryptocurrency News and Analysis","description":"Electrum 4.8.2 fixes a Lightning backup flaw affecting anchor channels and requires some users to replace older backup files.","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=13986","og_locale":"en_US","og_type":"article","og_title":"Electrum patches Lightning flaw, but old Bitcoin backups break","og_description":"Electrum 4.8.2 fixes a Lightning backup flaw affecting anchor channels and requires some users to replace older backup files.","og_url":"https:\/\/cryptonews.uk.com\/?p=13986","og_site_name":"Crypto News: Latest Cryptocurrency News and Analysis","article_published_time":"2026-10-02T06:16:47+00:00","og_image":[{"width":1280,"height":720,"url":"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/10\/electrum-backup-replacement-path.webp","type":"image\/webp"}],"author":"\u884c\u653f","twitter_card":"summary_large_image","twitter_misc":{"Written by":"\u884c\u653f","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/cryptonews.uk.com\/?p=13986","url":"https:\/\/cryptonews.uk.com\/?p=13986","name":"Electrum patches Lightning flaw, but old Bitcoin backups break - Crypto News: Latest Cryptocurrency News and Analysis","isPartOf":{"@id":"https:\/\/cryptonews.uk.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/cryptonews.uk.com\/?p=13986#primaryimage"},"image":{"@id":"https:\/\/cryptonews.uk.com\/?p=13986#primaryimage"},"thumbnailUrl":"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/10\/electrum-backup-replacement-path.webp","datePublished":"2026-10-02T06:16:47+00:00","author":{"@id":"https:\/\/cryptonews.uk.com\/#\/schema\/person\/822778c5844e0d16d43dce6630f4f1bf"},"description":"Electrum 4.8.2 fixes a Lightning backup flaw affecting anchor channels and requires some users to replace older backup files.","breadcrumb":{"@id":"https:\/\/cryptonews.uk.com\/?p=13986#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/cryptonews.uk.com\/?p=13986"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/cryptonews.uk.com\/?p=13986#primaryimage","url":"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/10\/electrum-backup-replacement-path.webp","contentUrl":"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/10\/electrum-backup-replacement-path.webp","width":1280,"height":720},{"@type":"BreadcrumbList","@id":"https:\/\/cryptonews.uk.com\/?p=13986#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/cryptonews.uk.com\/"},{"@type":"ListItem","position":2,"name":"Electrum patches Lightning flaw, but old Bitcoin backups break"}]},{"@type":"WebSite","@id":"https:\/\/cryptonews.uk.com\/#website","url":"https:\/\/cryptonews.uk.com\/","name":"Crypto News: Latest Cryptocurrency News and Analysis","description":"Latest Crypto &amp; 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\/13986","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=13986"}],"version-history":[{"count":0,"href":"https:\/\/cryptonews.uk.com\/index.php?rest_route=\/wp\/v2\/posts\/13986\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cryptonews.uk.com\/index.php?rest_route=\/wp\/v2\/media\/13987"}],"wp:attachment":[{"href":"https:\/\/cryptonews.uk.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=13986"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cryptonews.uk.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=13986"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cryptonews.uk.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=13986"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}