Zcash Pitches "Ironwood" Upgrade to Restore Confidence in Supply Cap After Orchard Flaw
Zcash (ZEC) saw sharp swings last week after Shielded Labs, the nonprofit involved in Zcash development, disclosed a critical vulnerability in the Orchard privacy pool that had gone unnoticed since 2022. The flaw could, in theory, have allowed an attacker to mint an unlimited amount of ZEC, triggering an abrupt selloff.
ZEC later recovered. As of June 8, it was trading around $442, up roughly 45% from its June 5 low. Even so, the token remained down about 19.7% over the past seven days and 26.2% over the past 30 days, as questions around supply integrity continued to weigh on sentiment.
In response, Shielded Labs, the Zcash Foundation and the Zcash Open Development Lab rolled out an emergency fix and coordinated with mining pools ViaBTC and Foundry to complete a network upgrade. Building on that effort, the teams formally proposed a longer-term plan on June 6 dubbed Ironwood.
Ironwood would create a new privacy pool using the repaired code, gradually deprecate the legacy Orchard pool, and prevent new tokens from being generated from the old pool. The proposal also aims to let nodes independently verify supply limits. Over time, users running Zcash software would be able to aggregate balances across both the old and new pools and independently confirm that total circulating ZEC has not exceeded the 21 million coin cap. Developers said the upgrade could also help flag abnormal token flows: as funds migrate out of the old pool, any historically forged ZEC could be revealed during transfers, or remain trapped in the legacy pool if it cannot be moved.
Despite the rebound, near-term price action remains under pressure, according to CoinJournal. The outlet attributed the recent rally primarily to the emergency patch and the Ironwood proposal, while noting that volatility has persisted. Technical commentary cited in the report said ZEC has formed an ascending wedge on the four-hour chart, a pattern often associated with weakening buying momentum.
The report added that ZEC has struggled to hold support in the $420–$430 area following the bounce. A break below that zone could shift focus to around $314; if that level gives way, the next downside range cited was $250–$200.
Beyond short-term trading, the disclosure struck at a central part of Zcash's investment case: privacy, cryptographic integrity and a fixed 21 million supply cap. With supply credibility now in focus, market attention is expected to center on whether Ironwood can be implemented smoothly and whether ZEC can hold key support levels during the upgrade process.
