{"id":75628,"date":"2026-07-19T21:36:54","date_gmt":"2026-07-19T21:36:54","guid":{"rendered":"https:\/\/crowdfundjunction.com\/blog\/zakura-node-hits-four-hour-sync-as-zcash-preps-july-28-ironwood-upgrade\/"},"modified":"2026-07-19T21:36:54","modified_gmt":"2026-07-19T21:36:54","slug":"zakura-node-hits-four-hour-sync-as-zcash-preps-july-28-ironwood-upgrade","status":"publish","type":"post","link":"https:\/\/crowdfundjunction.com\/blog\/zakura-node-hits-four-hour-sync-as-zcash-preps-july-28-ironwood-upgrade\/","title":{"rendered":"Zakura Node Hits Four-Hour Sync as Zcash Preps July 28 Ironwood Upgrade"},"content":{"rendered":"<p><b>(Originally posted on : Bitcoin News )<\/b><br \/>\n<\/p>\n<div>\n<div class=\"@container mb-[25px] rounded-sm overflow-clip py-0.5 pr-0.5 pl-2.5 bg-success-100\">\n<div class=\"flex flex-col gap-m overflow-clip rounded-[6px] !bg-success-10 p-3 @[420px]:p-m\">\n<h2 class=\"m-0 flex items-center gap-s text-[19px] !text-[#1c1c1c] md:text-[20px]\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"10\" viewbox=\"0 0 16 10\" fill=\"none\" class=\"shrink-0 text-success-100\" aria-hidden=\"true\"><path d=\"M1 1.5h14\" stroke=\"currentColor\" stroke-width=\"2.5\" stroke-linecap=\"round\"\/><path d=\"M1 8.5h10\" stroke=\"currentColor\" stroke-width=\"2.5\" stroke-linecap=\"round\"\/><\/svg><span>Key Takeaways<\/span><\/h2>\n<ul class=\"m-0 flex list-none flex-col gap-m pl-0\">\n<li class=\"m-0 flex items-start gap-s !text-[#434248]\"><span class=\"mt-2 size-2 shrink-0 rounded-full bg-success-100\" aria-hidden=\"true\"\/><span class=\"text-body\">Ironwood (NU6.3) seals Zcash\u2019s old Orchard pool at block 3,428,143 on July 28.<\/span><\/li>\n<li class=\"m-0 flex items-start gap-s !text-[#434248]\"><span class=\"mt-2 size-2 shrink-0 rounded-full bg-success-100\" aria-hidden=\"true\"\/><span class=\"text-body\">Taylor Hornby\u2019s May bug find pushed ZEC lower before it stabilized above $500.<\/span><\/li>\n<li class=\"m-0 flex items-start gap-s !text-[#434248]\"><span class=\"mt-2 size-2 shrink-0 rounded-full bg-success-100\" aria-hidden=\"true\"\/><span class=\"text-body\">Sean Bowe and Dev Ojha\u2019s Zakura node syncs Zcash 5 times faster than Zebra.<\/span><\/li>\n<\/ul>\n<\/div>\n<\/div>\n<p>The <a href=\"https:\/\/forum.zcashcommunity.com\/t\/ironwood-verifying-the-soundness-of-zcash-s-circulating-supply\/56044\" target=\"_blank\" rel=\"noopener noreferrer\">Ironwood hard fork<\/a>, known as NU6.3, activates around July 28, 2026, at block height 3,428,143. It closes a soundness flaw in the Orchard shielded pool and opens a new pool built on corrected code. Alongside it, a fast new <span>node<\/span> called Zakura is already live, giving operators a faster way to run the network.<\/p>\n<h2>A Bug Nobody Could See<\/h2>\n<p>Security researcher Taylor Hornby, working with Shielded Labs, found <a href=\"https:\/\/news.bitcoin.com\/zcash-orchard-counterfeiting-bug-patched\/\">the flaw<\/a> in late May 2026. The bug sat inside Orchard\u2019s cryptographic circuits. In theory, it lets someone mint counterfeit ZEC inside the shielded pool without leaving a trace. Zcash\u2019s privacy design, the same feature that protects users, also blocks outside observers from checking whether anyone has exploited it.<\/p>\n<p> <iframe src=\"https:\/\/markets.bitcoin.com\/crypto\/zcash\/embed\" width=\"100%\" style=\"max-height:500px;height:500px;border:none;overflow:hidden;border-radius:4px\" scrolling=\"no\" title=\"zcash market data\"><\/iframe> <\/p>\n<p>Developers moved fast. A soft fork shut down the Orchard pool temporarily. A hard fork, NU6.2, patched the immediate danger. <a href=\"https:\/\/markets.bitcoin.com\/crypto\/zcash\" target=\"_blank\" rel=\"noopener noreferrer\">ZEC\u2019s price<\/a> dropped sharply on the news before recovering part of its losses. The episode tested a core Zcash promise: that privacy and provable scarcity can coexist.<\/p>\n<h2>How Ironwood Locks the Old Pool<\/h2>\n<p>Once Ironwood activates, the legacy Orchard pool stops accepting new deposits or internal transfers. Existing coins in the old pool still work, but only if they move through a new checkpoint called a turnstile on their way to the new Ironwood pool.<\/p>\n<p>The turnstile enforces a simple rule. Outflows from the old pool cannot exceed the coins that legitimately went in. That means the total circulating ZEC supply becomes verifiable the moment Ironwood turns on, without waiting for every user to migrate.<\/p>\n<p>Two outcomes are possible if counterfeit coins existed. If no excess supply tries to leave the old pool, that stands as strong evidence that nothing was exploited. If excess supply does appear, the turnstile blocks it from leaving, and the extra coins get destroyed, giving the public proof of what happened.<\/p>\n<p>Project Tachyon is running formal verification on the new Ironwood circuits, producing machine-checked proofs rather than relying only on manual code review.<\/p>\n<h2>What Users Need to Do<\/h2>\n<p> <span>Node<\/span> operators must upgrade before block 3,428,143 hits, expected around 8 a.m. EST on July 28. Wallet providers tied to the Zcash Open Development Lab are adding prompts to guide shielded fund migration. Users holding transparent balances or funds outside the old Orchard pool do not need to take action. The legacy zcashd <span>node<\/span> software is reaching end of life around the same window, pushing remaining users toward modern clients.<\/p>\n<h2>Zakura Enters the Race<\/h2>\n<p><a href=\"https:\/\/zakura.com\/announcements\/introducing-zakura\/\" target=\"_blank\" rel=\"noopener noreferrer\">Zakura 1.0.0<\/a> launched July 15, 2026, forked from the Zcash Foundation\u2019s Zebra codebase. Sean Bowe, a Zcash cofounder and the cryptographic engineer leading Project Tachyon, built it with Dev Ojha, the Osmosis cofounder now leading Valar Group. Both projects are funded through private ZEC donations.<\/p>\n<p>Zakura syncs the <a href=\"https:\/\/news.bitcoin.com\/zcash-price-climbs-13-in-a-week-as-network-preps-ironwood-upgrade\/\">Zcash<\/a> mainnet in about four hours and 20 minutes, compared to roughly 20 hours and 46 minutes for Zebra in the same test. Pruned snapshots let a new <span>node<\/span> bootstrap in under two minutes. A zcashd compatibility mode keeps older wallets and integrations working during the transition.<\/p>\n<figure id=\"attachment_832273\" aria-describedby=\"caption-attachment-832273\" style=\"width:2560px\" class=\"wp-caption aligncenter\"><figcaption id=\"caption-attachment-832273\" class=\"wp-caption-text\">\u201cZakura syncs mainnet from the network far faster than Zebra in this trace, reaching the chain tip while Zebra is still in the sandblasting range,\u201d the Zakura blogpost details.<\/figcaption><\/figure>\n<p>Bowe and Ojha say the long-term goal is Visa and Mastercard-level throughput, near 50,000 transactions per second, for private payments. Today\u2019s shielded pool tops out near one transaction per second. Getting there depends on cryptography upgrades from Tachyon and Valar Group working alongside faster <a href=\"http:\/\/www.bitcoin.com\/get-started\/what-is-a-bitcoin-node\/\" class=\"lar_link lar_link_outgoing\" target=\"_blank\" rel=\"noopener noreferrer\">node<\/a> software like Zakura.<\/p>\n<p>The Zcash Foundation says it welcomes the new client, framing multiple independent <a href=\"http:\/\/www.bitcoin.com\/get-started\/what-is-a-bitcoin-node\/\" class=\"lar_link lar_link_outgoing\" target=\"_blank\" rel=\"noopener noreferrer\">node<\/a> implementations as a safeguard against the kind of single point of failure that let the Orchard bug go unnoticed for as long as it did.<\/p>\n<h2>What This Means for Traders<\/h2>\n<p>For traders, the Ironwood fork works like a public audit with a deadline. The turnstile design means the market gets a clear signal within days, not months of speculation, about whether the May bug was ever exploited. That fast, verifiable answer matters for a <a href=\"http:\/\/www.bitcoin.com\/get-started\/what-are-privacy-coins\/\" class=\"lar_link lar_link_outgoing\" target=\"_blank\" rel=\"noopener noreferrer\">privacy coin<\/a>, where doubts about hidden supply can weigh on price longer than a typical bug disclosure.<\/p>\n<p>Zakura adds a separate signal. Faster sync times and lower <a href=\"http:\/\/www.bitcoin.com\/get-started\/what-is-a-bitcoin-node\/\" class=\"lar_link lar_link_outgoing\" target=\"_blank\" rel=\"noopener noreferrer\">node<\/a> costs make it easier for exchanges, miners, and block explorers to run independent infrastructure, which lowers the odds that a future bug slips through unnoticed, the way the Orchard flaw did.<\/p>\n<p>ZEC has stabilized above $500 as the July 28 activation approaches, with developers, the Foundation, Shielded Labs, Project Tachyon, and Valar Group aligned around the same upgrade window.<\/p>\n<\/p><\/div>\n<p><a href=\"https:\/\/news.bitcoin.com\/zakura-node-hits-four-hour-sync-as-zcash-preps-july-28-ironwood-upgrade\/\">Source link <\/a><br \/>\n<br \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>(Originally posted on : Bitcoin News ) Key Takeaways Ironwood (NU6.3) seals Zcash\u2019s old Orchard pool at block 3,428,143 on July 28. Taylor Hornby\u2019s May bug find pushed ZEC lower before it stabilized above $500. Sean Bowe and Dev Ojha\u2019s Zakura node syncs Zcash 5 times faster than Zebra. The Ironwood hard fork, known as [&hellip;]<\/p>\n","protected":false},"author":19,"featured_media":75629,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"categories":[32],"tags":[],"_links":{"self":[{"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/posts\/75628"}],"collection":[{"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/users\/19"}],"replies":[{"embeddable":true,"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/comments?post=75628"}],"version-history":[{"count":0,"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/posts\/75628\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/media\/75629"}],"wp:attachment":[{"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/media?parent=75628"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/categories?post=75628"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/crowdfundjunction.com\/blog\/wp-json\/wp\/v2\/tags?post=75628"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}