- France’s tax authority suffered a breach reportedly exposing data linked to 678,437 people, including thousands with high declared incomes.
- The leaked information could make wealthy individuals easier to identify for fraud, extortion or physical attacks, although the database does not identify crypto ownership.
- France recorded 33 verified wrench attacks in the first half of 2026, the highest national total in CertiK’s dataset, while security experts continue urging users to minimize exposed personal data.
France is facing a fresh>crypto circles because detailed identity and income data can become valuable intelligence for criminals targeting people who may hold digital assets.
French reporting on the incident put the affected population at 678,437 people, although the final scope remains under investigation. The compromised information reportedly includes names, dates of birth, addresses, telephone numbers, email addresses and tax-related details. Nearly 27,000 affected individuals reportedly declared at least €100,000 in income, while 386 reported more than €1 million and eight exceeded €10 million.
That information does not prove that any affected person owns Bitcoin or other cryptocurrencies. However, combining tax records with public blockchain activity and social media profiles can help criminals build more precise profiles of potential targets.
France’s Wrench Attack Problem Intensifies
The concern arrives as physical attacks against crypto holders become more frequent. CertiK recorded 52 verified wrench attacks worldwide during the first half of 2026, with France accounting for 33 cases. The security firm also reported a sharp increase in home invasions, highlighting how criminals are increasingly targeting people rather than blockchain code.
For crypto users, the lesson is not that self-custody has failed. Non-custodial wallets can keep private keys outside centralized databases, reducing the consequences of conventional account breaches. The bigger vulnerability is often information surrounding ownership, including names, addresses, phone numbers and purchase records.
A separate August breach involving Trezor’s logistics provider ShipMonk reinforces that point. Nearly 14,000 customers were affected, with names, addresses, phone numbers and emails exposed, while Trezor said its own systems, devices and wallet security were not compromised.
Protecting Privacy Becomes Part Of Crypto Security
The overlap between data breaches and physical crypto crime strengthens the case for privacy-conscious security practices. Users can reduce unnecessary personal-data exposure, separate public identities from wallet activity where practical, avoid publishing holdings and treat unsolicited messages requesting wallet credentials as potential phishing attempts.
For the broader crypto industry, privacy tools and stronger operational security can complement self-custody. Blockchain transparency remains useful for auditing transactions, while privacy-preserving technologies can limit how easily financial activity is connected to a real-world identity.