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Zcash Activates Ironwood and Shuts Down Its Old Private Pool

The upgrade is meant to fully block an Orchard bug and possible counterfeit ZEC, while wallets, nodes, and exchanges have to migrate their systems.

By Luc Vesters
• 2 min read
Zcash Activates Ironwood and Shuts Down Its Old Private Pool

Key Takeaways

  • Zcash will turn on the Ironwood upgrade on Tuesday at block 3,428,143, which will shut down its largest private pool.
  • ZEC holders will keep their balances, but old funds will only be able to move out of the pool, not circulate inside the old setup.
  • The upgrade is designed to reinforce supply integrity after an Orchard bug, and node operators must move to Zebra 6.0.0 before Tuesday.

Zcash is set to activate the Ironwood upgrade on Tuesday at block 3,428,143, effectively closing its largest private pool. ZEC holders will not lose their balances, but from here on out, funds can only move out of that pool, not around inside the old system. The upgrade is also intended to tighten the network’s supply integrity after the recent Orchard bug.

What Changes for Holders

According to the developers, most users do not need to take any action right away. The old address format will still function because the new pool keeps the same address structure. Even so, some balances may appear stuck for a while until a user’s wallet supports the proper migration tool.

That does not mean Zcash is broken. Some exchanges may temporarily halt deposits or withdrawals while they update their systems, and the developers say that usually just means the exchange is behind on the upgrade. Node operators, however, do have a firm deadline. They need to switch to Zcash Foundation’s Zebra 6.0.0 release before Tuesday.

Why Ironwood Is Needed

The upgrade comes after a vulnerability was discovered in May in Orchard, the shielded pool that keeps transactions hidden. In theory, the flaw could have allowed counterfeit ZEC to be minted without immediate detection. ZODL patched the issue within days, but confidence had already taken a hit when ZEC then fell sharply.

Ironwood is meant to close that door for good. The new pool still uses Orchard, but it runs on a separate state and includes a turnstile that prevents more ZEC from leaving than has ever entered. In other words, any fake coins that may still exist in the old pool will not be able to move out. The upgrade also adds a quantum safeguard from ZIP 2005, although it is not full quantum protection yet.

Why This Matters Beyond Zcash

For European crypto readers, the bigger takeaway is how a protocol can address a supply issue through code without taking the network offline. The combination of a forced migration, wallet updates, and possible exchange pauses shows how much privacy coins depend on their surrounding infrastructure. It also underscores why audits and formal verification matter more and more for tokens with complicated supply mechanics.

The market is paying attention too. ZEC traded around $506 (€444) on Monday, up about 4% on the day and 22% over the past month. Over the past year, the coin has gained more than 1,100%, but the real test will come once wallets, nodes, and exchanges finish the migration.

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