Zcash, widely known as one of the most sophisticated privacy-focused cryptocurrencies, faced a major credibility test after blockchain intelligence firm Arkham Intelligence demonstrated that the majority of its network activity is traceable. According to Arkham’s analysis, more than half of all Zcash transactions can be linked to known individuals, organizations, or entities, with an attributed volume of approximately $420 billion in ZEC—a stark contrast to the protocol’s opaque reputation.
The traceability stems not from a cryptographic flaw but from how the network’s two address types are adopted. Zcash supports transparent (t-addresses) and shielded (z-addresses), with only direct z-to-z transfers offering full privacy via zk-SNARKs. However, exchanges, custodians, and institutions overwhelmingly use transparent addresses for regulatory and compliance reasons, creating visible entry and exit points that analytics firms exploit. Arkham noted: “That figure is remarkable for a chain explicitly designed to obscure transaction data. It’s possible because the majority of Zcash transactions are still transparent, and because on-ramps and off-ramps… often maintain transparent addresses for ease of transfer.”
As case studies, Arkham traced Zcash funds allegedly linked to Alexandre Cazes, the operator of the darknet marketplace AlphaBay, and tracked a trader who turned a $4.49 million ZEC investment into a $6.6 million gain after transferring to the Gemini exchange. The firm also identified ZEC seized by the U.S. government—3,691 coins now worth $2.48 million. Arkham emphasized that shielded transactions remain cryptographically opaque, concluding: “How you use Zcash determines how private you actually are.”
