Zcash Ironwood upgrade fixes Orchard flaw as ZEC trades near $1,470
Zcash (ZEC)
Editor:
Eugene Serbin
cryptovalleyjournal.com reports that Zcash activated its Ironwood upgrade at block height 3,428,143 in late July 2026 to address a theoretical flaw in the Orchard pool discovered by researcher Taylor Hornby. The upgrade, internally tracked as NU6.3, introduced a new shielded pool and restricted the old Orchard pool to a turnstile mechanism that caps outflows to match demonstrated inflows. This structural change ensures that any earlier exploit could never produce additional supply, effectively neutralizing the risk of counterfeit ZEC minting.
The migration proceeded rapidly, with approximately 87% of old Orchard holdings moving into the new pool within five weeks. Zcash, launched in October 2016 by founder Zooko Wilcox, utilizes zk-SNARK cryptography to allow users to choose between transparent and shielded transaction addresses. The network maintains a Bitcoin-style monetary policy with a 21 million hard cap and proof-of-work consensus using the Equihash algorithm.
As of September 2026, roughly 16.94 million ZEC circulate, valuing the project at USD 25.7 billion and ranking it ninth among cryptocurrencies. Co-founder Sean Bowe noted that the soundness of the zk-SNARK protocol would have been significant enough to change Zcash's history forever.
How the market reacted
Whalio's own Binance spot order flow for ZEC, measured when this story was written up on 20 September 2026. Not the outlet's figures.
Zcash is trading at $1,470.96 on Binance with a 1-hour buy ratio of 54.5% and a 4-hour buy ratio of 57.6%, indicating immediate buying pressure. This contrasts with the 24-hour buy ratio of 45.8%, suggesting that short-term momentum is stronger than the broader daily trend. Volume deltas show a positive flow of +$955,745 over the last hour and +$12,200,915 over four hours, while the 24-hour delta is negative at -$23,839,612. The cumulative volume delta for the 24-hour period closed at +$9,544,586, with net buying occurring in 13 of the last 24 hours. The buy ratio represents the proportion of volume executed by buyers versus sellers, while the volume delta measures the net difference between buy and sell volume. These figures suggest that while the day has seen net outflow, recent hours have seen a shift toward aggressive accumulation.
The latest daily buy ratio of 52.9% sits at the 82nd percentile of the last 322 days, against a median of 50.2% - stronger buying than most days.
Was that an ordinary day?
The same Binance spot measurements for ZEC, averaged over the days leading up to the story.
Over the preceding week, the 7-day average buy ratio was 51.9%, compared to a 24-hour ratio of 45.8%, indicating that recent trading activity is less buyer-heavy than the weekly norm. Spot volume over the last day was $292,252,979, which is 0.75 times the weekly average, showing that current trading activity is subdued relative to the past week. The coin has gained 31.0% over the last eight days, with a total volume delta of +$93,718,583 for that period. Net buying occurred on 6 of the last 7 days, highlighting a strong upward trend leading into today. This represents an unusual day for the coin, as the current 24-hour buy ratio is 6.0 percentage points lower than the weekly average.