{"id":12835,"date":"2026-09-04T20:23:14","date_gmt":"2026-09-04T20:23:14","guid":{"rendered":"https:\/\/cryptonews.uk.com\/?p=12835"},"modified":"2026-09-04T20:23:14","modified_gmt":"2026-09-04T20:23:14","slug":"firo-hard-fork-activates-spark-privacy-fix","status":"publish","type":"post","link":"https:\/\/cryptonews.uk.com\/?p=12835","title":{"rendered":"Firo hard fork activates Spark privacy fix"},"content":{"rendered":"<p><\/p>\n<div data-single-article-content=\"\">\n<p>The Firo hard fork was 153 blocks away from activation early Friday, leaving wallet users and network operators only hours to install software that repairs an August vulnerability in the privacy coin\u2019s Spark transaction system.<\/p>\n<p>The chain reached block 1,370,847 at 1:45:47 a.m. UTC on Sept. 4. The fork activates at block 1,371,000, which Firo estimated would arrive around 10 a.m. UTC. The block height, not the clock, determines when the new rules begin.<\/p>\n<p>Firo said wallet users, full-node and masternode operators, miners, exchanges and other service providers should upgrade to v0.14.18.0 before activation. Nodes left on older software will no longer be compatible with the upgraded network after the threshold.<\/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\">XRPL\u2019s May 27 upgrade shows how validators and markets decide a blockchain split<\/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<h2>What the Firo hard fork repairs<\/h2>\n<p>Spark is Firo\u2019s protocol for private transactions. The project disclosed on Aug. 13 that a flaw in multi-input Spark spends could, under specific conditions, allow forged coins and inflate supply. Firo said the issue did not compromise wallets or keys, let an attacker remove coins from an address, or affect single-input spends.<\/p>\n<p>The researcher who disclosed the flaw generated about 200 FIRO on mainnet in a controlled test. Firo said it had found no evidence of other inflation as of its Aug. 13 notice.<\/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 Daily Brief\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 Daily Brief <\/span><\/p>\n<h2 id=\"cs-inline-newsletter-1-title\" class=\"cs-inline-newsletter__title\">The signal, before the noise.<\/h2>\n<p id=\"cs-inline-newsletter-1-copy\" class=\"cs-inline-newsletter__copy\">Start your day with the crypto stories moving markets, decoded by CryptoSlate\u2019s editors.<\/p>\n<\/div>\n<div class=\"cs-inline-newsletter__form-shell\">\n<p class=\"cs-inline-newsletter__form-heading\">One email. Everything that matters.<\/p>\n<p id=\"cs-inline-newsletter-1-privacy\" class=\"cs-inline-newsletter__privacy\">Free to join. Unsubscribe any time.<\/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<p> <i class=\"fa-regular fa-circle-check\" aria-hidden=\"true\"\/> <span><strong>You\u2019re on the list.<\/strong> Your next Daily Brief is on its way.<\/span><\/p>\n<\/div>\n<\/div>\n<\/aside>\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\">AI-assisted Zcash flaw exposes the supply integrity gap an emergency fork could not fully close<\/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>As an interim defense, version 0.14.17.2 restricted Spark spending to one input. Someone assembling a larger payment could split it across several single-input transactions, but the separate amounts could be correlated more easily than a normal multi-input spend. The stopgap protected supply integrity while providing weaker privacy for users who transacted before the permanent fix.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-560335\" src=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/09\/exec-402b1255-cde1-4c3c-bf6f-1c3928f2d05c.png\" alt=\"Firo hard fork at block 1,371,000 infographic showing the change from single-input Spark in v0.14.17.2 to restored multi-input Spark in v0.14.18.0, with unchanged balances and required software upgrades.\" width=\"720\" height=\"900\"\/><img decoding=\"async\" class=\"lazyload aligncenter wp-image-560335\" src=\"https:\/\/cryptoslate.com\/wp-content\/uploads\/2026\/09\/exec-402b1255-cde1-4c3c-bf6f-1c3928f2d05c.png\" alt=\"Firo hard fork at block 1,371,000 infographic showing the change from single-input Spark in v0.14.17.2 to restored multi-input Spark in v0.14.18.0, with unchanged balances and required software upgrades.\" width=\"720\" height=\"900\"\/><\/p>\n<p>In practical terms, one private payment that would normally draw on several Spark coins could need to be broken into a pattern of separate amounts. Firo\u2019s warning concerned correlations among those amounts; it did not say that the temporary rule exposed wallet keys or let others take funds.<\/p>\n<p>Version 0.14.18.0 introduces a new versioned Chaum V2 proof and transaction format, according to the release notes. At block 1,371,000, updated wallets will automatically resume normal multi-input Spark spending, while the software will continue to validate historical Spark transactions.<\/p>\n<p>Existing Spark coins, balances, addresses and wallet keys stay valid, so funds do not need to be migrated or reminted. The mandatory action applies to people and businesses running affected Firo software or infrastructure, not to a passive balance that remains untouched. The funds persist across the fork, but the software enforcing the network\u2019s rules must change.<\/p>\n<p>Firo said it plans to publish a full technical disclosure and post-mortem after the fork activates.<\/p>\n<\/div>\n<p>Featured,Privacy,mining,paymentsmining,payments,Privacy#Firo #hard #fork #activates #Spark #privacy #fix1788553394<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Firo hard fork was 153 blocks away from activation early Friday, leaving wallet users and network operators only hours to install software that repairs an August vulnerability in the privacy coin\u2019s Spark transaction system. The chain reached block 1,370,847 at 1:45:47 a.m. UTC on Sept. 4. The fork activates at block 1,371,000, which Firo<\/p>\n","protected":false},"author":1,"featured_media":12836,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[2218,6743,1053,2948,308,447,167,134,2957],"class_list":["post-12835","post","type-post","status-publish","format-standard","has-post-thumbnail","category-ethereum","tag-activates","tag-firo","tag-fix","tag-fork","tag-hard","tag-mining","tag-payments","tag-privacy","tag-spark"],"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>Firo hard fork activates Spark privacy fix - Crypto News: Latest Cryptocurrency News and Analysis<\/title>\n<meta name=\"description\" content=\"The Firo hard fork activates at block 1,371,000, restoring multi-input Spark spending and making older node software incompatible.\" \/>\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=12835\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Firo hard fork activates Spark privacy fix\" \/>\n<meta property=\"og:description\" content=\"The Firo hard fork activates at block 1,371,000, restoring multi-input Spark spending and making older node software incompatible.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/cryptonews.uk.com\/?p=12835\" \/>\n<meta property=\"og:site_name\" content=\"Crypto News: Latest Cryptocurrency News and Analysis\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-04T20:23:14+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/09\/firo-network-split.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=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/cryptonews.uk.com\/?p=12835\",\"url\":\"https:\/\/cryptonews.uk.com\/?p=12835\",\"name\":\"Firo hard fork activates Spark privacy fix - Crypto News: Latest Cryptocurrency News and Analysis\",\"isPartOf\":{\"@id\":\"https:\/\/cryptonews.uk.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/cryptonews.uk.com\/?p=12835#primaryimage\"},\"image\":{\"@id\":\"https:\/\/cryptonews.uk.com\/?p=12835#primaryimage\"},\"thumbnailUrl\":\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/09\/firo-network-split.jpg\",\"datePublished\":\"2026-09-04T20:23:14+00:00\",\"author\":{\"@id\":\"https:\/\/cryptonews.uk.com\/#\/schema\/person\/822778c5844e0d16d43dce6630f4f1bf\"},\"description\":\"The Firo hard fork activates at block 1,371,000, restoring multi-input Spark spending and making older node software incompatible.\",\"breadcrumb\":{\"@id\":\"https:\/\/cryptonews.uk.com\/?p=12835#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/cryptonews.uk.com\/?p=12835\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/cryptonews.uk.com\/?p=12835#primaryimage\",\"url\":\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/09\/firo-network-split.jpg\",\"contentUrl\":\"https:\/\/cryptonews.uk.com\/wp-content\/uploads\/2026\/09\/firo-network-split.jpg\",\"width\":1280,\"height\":720},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/cryptonews.uk.com\/?p=12835#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/cryptonews.uk.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Firo hard fork activates Spark privacy fix\"}]},{\"@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; 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