Grayscale’s promotion of its Zcash exchange-traded fund has prompted a debate about cryptocurrency privacy, network funding, and the cost of obtaining digital-asset exposure through regulated investment products.

The discussion followed a Grayscale post presenting Zcash as combining attributes associated with physical cash and Bitcoin. 

The post included the ZEC ticker and formed part of the asset manager’s promotion of the Grayscale Zcash ETF, which trades under the ticker ZCSH.

JAN3 CEO Samson Mow challenged the comparison, stating that Bitcoin can also be used privately. 

He raised concerns about Zcash’s anonymity set, development-funding structure, and security history while accusing Grayscale of understating Bitcoin’s privacy capabilities.

Mow continued his criticism in a subsequent post and focused on the economics of Zcash and its investment product, citing the network’s allocation of block rewards and the fund’s 2.50% annual management fee.

Under Zcash’s current structure, miners receive 80% of newly issued ZEC, while 20% is directed toward development-related purposes. 

Mow characterized the allocation as a tax on miners. Zcash documentation instead describes it as protocol-defined ecosystem funding. 

The different terminology reflects a broader disagreement over whether such funding supports continued development or imposes a cost on network participants.

The Zcash ETF’s 2.50% fee is paid from the fund’s assets. If the fee remained unchanged and ZEC’s price stayed flat, the amount of cryptocurrency represented by an investment would decline by roughly 22% over 10 years. 

This calculation illustrates the cumulative effect of the fee but does not account for price movements, changes to the fee, or other market factors.

Fees also featured in a response from Strive CRO Jeff Walton, who included screenshots comparing the Zcash fund with Grayscale’s Bitcoin product.

The Zcash fund page, dated August 24th, showed approximately $313.5 million in assets under management, 387,212.21 ZEC, and a 2.50% management fee. 

The GBTC screenshot showed approximately $10.38 billion in assets, about 131,501 Bitcoin, and a 1.50% fee. 

Walton raised the possibility that commercial incentives influenced Grayscale’s promotion.

Other users made a similar connection between the campaign and the launch of the investment product. 

21xSatoshi suggested that the post was intended to help market the fund, while another respondent attributed Grayscale’s message to its interest in the ETF.

Some respondents questioned the practical effectiveness of Zcash privacy. 

One user raised concerns about verifying funds held in shielded pools and recommended Bitcoin-based privacy tools.

Another argued that identity requirements at centralized exchanges limit the privacy available to users. Know-your-customer rules can reveal a customer’s identity to an exchange.

Mow also referred to concerns about an inflation exploit. Zcash’s Orchard privacy system contained a critical vulnerability beginning with the activation of NU5 on May 31, 2022. 

Developers claimed an emergency upgrade deployed in June 2026 addressed the flaw, although its effectiveness cannot be conclusively established from the concealed transaction history.

A security researcher discovered the flaw on May 29th, 2026, and it was publicly disclosed on June 3rd.

The vulnerability could have allowed an attacker to create counterfeit ZEC within the shielded pool, effectively enabling an internal double-spend. 

Orchard’s concealed transaction values prevented users from independently determining whether it had been exploited.

The network’s turnstile prevented more ZEC from leaving Orchard than had legitimately entered, protecting the externally circulating supply but not guaranteeing that every balance inside the pool was fully backed. 

If counterfeit ZEC existed and all users attempted to withdraw their funds, some holders could be unable to retrieve their claimed balances.

Zcash later sealed the original pool through the Ironwood upgrade. Developers reported no known exploitation, but the pool’s privacy made that impossible to prove conclusively.