Zcash development teams have put forward the Ironwood pool, a proposal aimed at fixing a supply verification issue tied to the existing Orchard shielded pool. The problem, which stems from a flaw in Orchard's design, has prevented accurate auditing of the total Zcash supply. Ironwood would phase out the original Orchard pool and introduce a new mechanism to restore that capability.
The Orchard Flaw
Orchard is one of Zcash's shielded pools, allowing private transactions. But a flaw in its construction made it impossible to correctly verify the supply of Zcash moving through it. Without that verification, users and third parties can't be sure the overall supply hasn't been inflated or tampered with. The development teams didn't detail the exact technical bug, but they described it as a supply verification issue that needed a structural fix rather than a simple patch.
How Ironwood Works
The Ironwood proposal takes a two-step approach. First, it would close the original Orchard pool to any new activity. That means no new funds can enter the flawed pool. Second, any funds that would have gone into Orchard will instead be routed through a turnstile mechanism. That turnstile sends the funds into a new shielded pool, effectively restoring the ability to track and verify the total supply. The turnstile acts as a one-way gate, ensuring all shielded Zcash passes through a verifiable checkpoint.
Closing the old pool and redirecting through a turnstile isn't a trivial change. It requires consensus from the Zcash community and a network upgrade to implement. The development teams have submitted the proposal for technical review and community discussion.
What's at Stake
Supply verification is a cornerstone of any cryptocurrency. Without it, users can't trust that the system isn't secretly minting new coins. Zcash's privacy features, which hide transaction amounts, make verification even more critical. The Ironwood pool aims to preserve that trust without sacrificing the privacy guarantees that Orchard was designed to provide.
The proposal is now being reviewed by Zcash stakeholders. No timeline has been set for a decision or deployment. The teams behind the proposal have not indicated whether Ironwood would require a hard fork or a softer upgrade. Those details are expected to emerge as the community evaluates the plan.
