Shielded Labs raised the possibility of a delay in the Ironwood Zcash network upgrade, warning that ecosystem participants such as exchanges, mining pools and wallets may not have enough time to prepare their systems for the planned activation in tardy July.

Jason McGee, Executive Director of Shielded Labs, he said in a post on the Zcash community forum that two enormous projects are progressing at the same time. In addition to Ironwood, infrastructure providers are being asked to replace Zcash’s long-standing node and wallet software, zcashd, with a recent set of tools known as the Z3 stack.

The concerns highlight the trade-off between quickly restoring trust in Zcash’s protected supply and allowing ecosystem participants enough time to securely deploy and audit recent infrastructure.

Ironwood was proposed after researchers discovered an “infinity” bug in Orchard, the main private Zcash transaction pool. The vulnerability could theoretically allow an attacker to create an unlimited number of counterfeit ZEC tokens in a pool without being detected. Developers said there was no evidence the pool had been used. However, Orchard’s privacy features make it impossible to prove that no counterfeit coins were created.

Source: Zooko Wilcox

Ironwood deployment conflicts with Zcash software migration

Ironwood will open a replacement private pool and prevent recent activity at the existing Orchard pool. Funds leaving Orchard would have to go through an accounting checkpoint that would prevent more ZECs from exiting than originally entered. This would allow users to check whether the circulating supply is within the intended Zcash limits.

At the same time there is Zcash outgoing zcashd, software used by many ecosystem participants to connect to the network and process transactions. Its placeholder stack includes Zebra to support the network node, Zaino to provide blockchain data to the application, and Zallet to the wallet function.

The network’s official guidance says operators may have to modify their systems as some Zcashd features will not have direct replacements.

Related: Why did ZEC drop 40% even after Zcash patched the shielded pool bug?

McGee said Zallet and Zaino are still in development and not ready for production apply. Feedback collected from infrastructure providers shows that some expect them to be ready by the end of July, while others need more time, he added.

McGee said no delays have been set.

Founder of Zcash Zooko Wilcox he said Security reviews have not identified any additional major bugs so far, and that developers are also working to validate the recent system before activating Ironwood.

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