Arkham Intelligence deanonymizes 53% of Zcash transactions
Arkham Intelligence's blockchain analytics platform reportedly deanonymized 53% of Zcash transactions, revealing $420 billion in trading volume and mapping transaction sources and destinations. The findings raise concerns about Zcash's promised privacy protections, potentially harming the cryptocurrency's credibility and users' expectation of anonymity.
What happened
Arkham Intelligence, a crypto analytics firm, revealed on December 8, 2025 that it had deanonymized thousands of transactions on the Zcash blockchain. According to an X post by Arkham, 53% of all Zcash transactions are labeled, $420 billion of trading volume was attributed to specific entities, and 48% of all inputs and outputs were attributed to identified entities.
The findings showed that 37% of all Zcash balances are labeled, totaling $2.5 billion. The U.S. government reportedly holds a significant amount of Zcash from a seizure proceeding related to the AlphaBay case.
Reported impact
The deanonymization could significantly impact Zcash's credibility, as the blockchain was designed to offer zero-knowledge transactions and supposed anonymity. Privacy tokens like Zcash had gained popularity based on their promised anonymity, but Arkham's findings suggest these transactions may not be as anonymous as users believed.
Index analysis
The analytics platform identified top entities and wallets holding Zcash, mapped transaction flows, and attributed balances to specific addresses. The system was able to trace the origins and destinations of transactions across the Zcash network despite the blockchain's privacy features.
Classification
Sources and evidence
This record was researched and written by the Index, based on the following original reporting.