Bitcoiners Warned After French Tax Authority Confirms Data Breach Affecting Hundreds of Thousands

Bitcoiners have been warned after France’s tax administration confirmed that hackers breached its information system, exposing sensitive financial and personal data belonging to hundreds of thousands of taxpayers and businesses.

Writing on X on Friday, Bitcoin developer Jameson Lopp said the leak was “more bad news for Bitcoiners living in the leading country for wrench attacks.”

Lopp has created a tracker counting wrench attacks — when physical violence is used to steal crypto — across the world. A large amount happens in France, where data has been leaked before. 

The news comes one day after hardware wallet manufacturer Trezor announced a data breach exposing customer data. 

Cybersecurity researchers at FrenchBreaches, who reviewed samples of the leaked data, reported that the affected records break down to roughly 392,867 individuals and 285,570 businesses. 

Among the individuals, an estimated 26,805 have a reported annual taxable income of €100,000 or more, 386 exceed €1 million, and eight exceed €10 million. The hacker is said to be offering the full dataset for sale for several thousand euros.

The breach first surfaced publicly on August 12, when a hacker using the alias “ZeroBytes” posted on a cybercrime forum claiming to have infiltrated internal DGFiP servers and obtained VPN credentials that unlocked an internal lookup tool covering millions of taxpayers.