France tax breach puts wealthy Bitcoin holders at risk

A hacker is marketing tax details involving over 678,000 French individuals and companies, exposing a treasure trove of personal and financial data that could be used for phishing, identity theft, and targeting Bitcoin holders.

Chainalysis estimates that criminals earned a minimum of $17 billion from crypto scams and fraud in 2025, with impersonation scams increasing in size by more than 1,400% over the same year. Using identifiable information like names, addresses, and income figures can make a generic scam seem legitimate enough to appear as if it comes from a bank, exchange, tax office or police department.

What the hacker is selling

French cybersecurity outlet FrenchBreaches, which first reported the sale, said the data came from France’s tax authority, the DGFiP. The outlet said the file covers 392,867 individuals and 285,570 professionals. A sample included names, addresses, phone numbers, income figures, and family information.

The sample appeared to indicate potential targets. FrenchBreaches noted a total of 26,805 individuals with a reported reference income of at least $116,000, 386 with a reference income of more than $1.16 million, and eight with a reference income exceeding $11.6 million.