The Zcash network is 85% through its move to the Ironwood upgrade, and the old Orchard pool has dwindled to just 3% of the total supply. The shift, which has been rolling out over recent weeks, is meant to harden the privacy-focused cryptocurrency against emerging vulnerabilities and future threats.
Why the Orchard pool is fading
Orchard, the shielded payment pool that Zcash users have relied on since 2021, is being phased out. As of the latest network data, only 3% of ZEC remains in that pool. That's a sharp drop from the share it held before the migration began. The rest has moved into the new Ironwood pool, which the Zcash development team says brings stronger cryptographic guarantees and better resistance to attacks that could compromise user anonymity.
The shift isn't just a software update. It's a deliberate retirement of an older infrastructure that may have become a target. By moving the bulk of supply to Ironwood, the network is shrinking the surface area for potential exploits. That matters because Zcash's core promise is private transactions, and any weakness in the pool's construction could expose that privacy.
How Ironwood changes the privacy math
Ironwood is built on a newer proving system that reduces the computational cost of shielded transactions while increasing the difficulty of tracking them. The upgrade also introduces a more efficient key schedule, which makes it harder for someone to link a user's addresses across separate transactions. For Zcash, that's not a luxury—it's the point.
The migration is being done in stages. Each block, a portion of the Orchard pool is swept into Ironwood, and that process is now 85% done. The remaining 15% is expected to move over in the coming weeks, barring any network hiccups. The team has not set a hard deadline for the final sweep, but they've signaled that the pace is steady.
Why the rush to harden now
The move to Ironwood isn't just about upgrading for its own sake. The Zcash developers have been explicit that the shift is a defensive measure. Cryptographic vulnerabilities aren't always announced—they're often discovered quietly. By getting ahead of the curve, the network avoids a scramble later.
The Orchard pool, for all its history, had become a known quantity. Attackers have had years to study it. Ironwood introduces fresh code that hasn't been subjected to the same long, quiet probing. That's the advantage of a proactive migration: you close doors before someone tries them.
The network is currently running both pools in parallel during the transition, but Orchard is fading fast. Once the migration hits 100%, the old pool will be deprecated entirely, and Ironwood will be the only shielded option.
What's left to watch
The final stretch of the migration is the part that can get sticky. The last few percent of any network shift tend to bring edge cases—clients that haven't upgraded, nodes running old software, or users who've left coins in Orchard without moving them. The Zcash team hasn't said what happens if some users miss the cutoff, but it's a safe bet that those funds won't be lost—they'll just be locked out of the newer privacy features until they manually move.
For now, the countdown is on. When the Orchard pool hits zero, the Ironwood era begins in full. That's the moment to watch.
