Zcash's Ironwood upgrade might hit snooze so exchanges can actually wake up ready 🚨

Shielded Labs has warned that Zcash's planned Ironwood network upgrade could be pushed back from its late-July target, citing concerns that exchanges, mining pools and wallet operators may need more time to prepare their infrastructure. Jason McGee, executive director of Shielded Labs, raised the possibility in a Zcash community forum post, noting that two major technical efforts are unfolding simultaneously and could overwhelm ecosystem participants.

Ironwood would open a replacement private pool and prevent new activity inside Zcash's existing Orchard pool. Funds leaving Orchard would be required to pass through an accounting checkpoint designed to ensure no more ZEC exits than originally entered, a mechanism intended to let users verify that the circulating supply remains within intended limits. The upgrade was proposed after researchers discovered an "infinity" bug in Orchard, Zcash's main private transaction pool, that theoretically could have allowed an attacker to mint unlimited counterfeit ZEC inside the pool without detection. Developers said they found no evidence the pool had been exploited, though Orchard's privacy features make it impossible to prove no fake coins were created.

At the same time, Zcash is retiring zcashd, the longstanding node and wallet software used by many ecosystem participants, in favor of a new collection of tools known as the Z3 stack. The replacement set includes Zebra for operating a network node, Zaino for supplying blockchain data to applications and Zallet for wallet functions. Official guidance documents said operators may need to modify their systems, as some zcashd functions will not have direct replacements in the new stack.

McGee said Zallet and Zaino were still under development and not ready for production use. He added that feedback gathered from infrastructure providers indicated some expect to be ready by late July while others require additional time, and stressed that no delay has been finalized. Zcash founder Zooko Wilcox said security reviews had found no additional serious bugs so far and that developers are also working to verify the new system before Ironwood activates.