Zcash creator Zooko Wilcox says the upcoming Ironwood upgrade will let users independently verify the cryptocurrency's circulating supply starting from the first block after activation. The change eliminates the need to rely on any individual's word about whether counterfeit coins were ever created.
How Ironwood changes the supply check
Wilcox explained in a statement that Ironwood modifies the Orchard pool — the shielded address system where ZEC transactions can be anonymous. After the upgrade goes live, the old Orchard pool will be frozen for new deposits. Any ZEC still sitting in that pool must exit through a gate called the turnstile.
The turnstile mechanism works as a strict accountant: it tracks every legitimate coin that enters and leaves the pool. If someone tries to move out more ZEC than was ever put in, the turnstile blocks the transaction. That means excess coins — counterfeit ones — become economically useless because they can't be spent.
What happens to the existing Orchard pool
The legitimate balance in the Orchard pool is roughly 4.5 million ZEC, according to Wilcox. Any amount above that would be rejected under the new rules. On day one of Ironwood activation, the software will 'snuff out' any surplus immediately and trustlessly, he said.
Wilcox personally believes no counterfeiting occurred in Zcash's history. But he stressed that Ironwood removes the need for users to take his word — or anyone else's — on that point. 'Ironwood will snuff out any excess ZEC in the Orchard pool immediately and trustlessly on Day 1, regardless of whether counterfeit coins exist,' he stated.
Over time, migration tells the story
If no excess ZEC ever tries to leave the old pool during the migration period, that supports the view that no counterfeit coins were created. But if an attempt happens, the turnstile will reject it, publicly revealing the counterfeiting. Either way, the system gives a clear, verifiable result.
Wilcox described the upgrade as a way to move from trusting individuals to trusting code. 'Ironwood removes the need to trust his or any other individual's assessment,' he said of the new verification method.
The upgrade is still being developed. A specific activation date hasn't been announced, but the Zcash community is preparing for a vote on whether to adopt Ironwood in an upcoming network upgrade cycle.
