The Zcash Ironwood upgrade activated on Tuesday, July 28, sealing the Orchard shielded pool to new deposits and opening a fresh privacy pool that starts from zero, according to The Block.
Roughly 3.6 million ZEC remained locked inside Orchard once the switch took effect at block height 3,428,143. The move closes out a four-year-old counterfeiting flaw in Orchard’s underlying math, a bug that Shielded Labs researcher Taylor Hornby discovered in May.
Why Orchard Can Only Move Money Out Now
According to The Block, Ironwood reuses Orchard’s patched zero-knowledge circuit and Halo 2 proof system, but adds something Orchard never had: formal verification. The new pool has been mathematically proven to work as designed under every possible circumstance, closing off the class of bug that let Hornby’s flaw slip through undetected for years.
Orchard itself did not disappear. It now runs through what developers call a turnstile, a mechanism that permanently caps how much ZEC can leave the pool at the amount that ever went in. Any counterfeit coins, if they exist, stay trapped inside rather than spending out into circulation.
ZEC dropped about 9% on Tuesday to $460 before recovering to roughly $475, The Block reported, extending a selloff that first hit the token when the bug became public in May. “Orchard was fixed in 5 days and replaced in 60,” ZODL Executive Director Josh Swihart said, according to The Block, crediting a joint effort among the Zcash Open Development Lab, Project Tachyon, Valar Group, the Zcash Foundation, and Shielded Labs.
What Node Operators and Holders Need to Do Now
Node operators faced a hard deadline. The Zcash Foundation required its Zebra 6.0.0 client installed before Tuesday’s activation height to stay on the correct chain, according to the foundation’s own release notes. Ordinary ZEC holders have less to manage.
Their existing shielded address still works, since Ironwood reuses it, and most people do not need to act today while wallet providers finish building migration tools, BeInCrypto reported. The fix lands during an active stretch for the broader altcoin market, where protocol-level security work has moved prices as much as adoption news this year.
The 30-Day Migration Window Worth Watching
The next month will show how fast the remaining Orchard balance moves through the turnstile, a process ZODL’s public dashboard tracks block by block, per BeInCrypto. Zcash founder Zooko Wilcox has urged holders to turn on Tor or Nym before migrating, warning that a wallet’s connection to the network can otherwise expose an IP address alongside a balance. BeInCrypto also reported that scammers have begun impersonating official Ironwood migration support.
What This Means for You
If you hold ZEC, your funds are not at risk, and your existing address will keep working once your wallet provider finishes updating its migration tools. Consider turning on a network-level privacy tool like Tor before moving funds out of Orchard, since the amount of any transaction is public even though the sender and recipient are not.
If your exchange pauses ZEC deposits or withdrawals this week, that reflects the exchange catching up to the upgrade, not a problem with Zcash itself.
This article is for informational purposes only and does not constitute financial advice. Do your own research before making any investment decisions.
