TL;DR:
- The Zcash network upgrade will execute upon reaching block height 3,428,143.
- The Orchard private pool will lock 3.76 million ZEC, representing 22% of the circulating supply.
- Node operators must install Zebra 6.0.0 to maintain compatibility with the system.
Next Tuesday, July 28, the Zcash Ironwood network will activate its infrastructure upgrade upon reaching block 3,428,143 to restructure its largest private pool of funds. The enhancement will seal the Orchard pool to prevent internal transfers without affecting the security of user balances.
ZCASH IRONWOOD IS ALMOST HERE
On 28 July, migrating your shielded ZEC can link your IP address to your balance.
Strong on-chain privacy. Undone at the network layer. The Nym fix is here. 
$ZEC#Zcashpic.twitter.com/I57kFjuDTY
— Nym (@nym) July 27, 2026
According to official data from the Zcash Foundation, the affected pool holds a total of 3.76 million ZEC, valued at approximately $1.89 billion. Data from the Zcash Open Development Lab (ZODL) suggests this amount represents nearly 22% of the total circulating supply at the end of July 2026.
Technical transition and network security
To maintain synchronization with the chain, node operators must upgrade their software to version Zebra 6.0.0 prior to the activation milestone. Developer reports indicate that several exchanges may temporarily pause deposits and withdrawals while completing platform adjustments.
The origin of the change responds to a flaw detected in May by researcher Taylor Hornby, a member of Shielded Labs. According to the protocol’s technical documentation, the mathematical vulnerability in Orchard’s proofs could have hypothetically allowed the generation of counterfeit coins.
Following the disclosure of the issue in May 2026, the price of ZEC dropped by over 30% almost instantly, reaching a low of $385.80. Analyses presented by ZODL point out that the implementation of the turnstile mechanism will prevent more tokens from leaving than were originally deposited.
Additionally, the new pool incorporates proposal ZIP 2005 to add safeguards against quantum computing. Reports from the development team state that this design serves as a preliminary backup to recover funds in the event of future breakthroughs in cryptographic decryption.
Regarding the migration process, Zooko Wilcox, founder of Zcash, recommended activating network-level privacy tools such as Tor or Nym before moving capital. Statements attributed to Wilcox warn that requests sent to servers could link the user’s IP address with the publicly transferred balance.
In the spot market, at the close of trading on Monday, the ZEC cryptocurrency traded near $506, accumulating a 22% gain over the past month and growth of over 1,100% over the past year.
The interactive ZODL dashboard will begin tracking the outflow of funds from the Orchard pool block by block once activation is complete.