French Tax Agent Leaked Crypto Owners’ Data

A French tax agent leaked the personal data of cryptocurrency holders after accessing unauthorized databases, creating a broader security risk for investors across Europe.

A French tax collector is reported to have leaked confidential data of cryptocurrency owners, which is a cause for concern regarding data security.

On June 30, 2025, a court sentenced 32-year-old Ghalia C. to prison after convicting her of complicity in an attack on a prison official and criminal conspiracy.

According to French media outlet Le Parisien, the ex-agent has sought out high-profile crypto investors, hacking the tax authority databases without permission and targeting prominent individuals and cryptocurrency experts.

An attack on a prison guard triggered the inquiry, which caused the police to learn that Ghalia C. had revealed the personal information of the guard. Additional investigations revealed that she had a history of performing unauthorized searches in her database.

Database Access Exposed Private Holdings

Ghalia C. assembled profiles of targets with tax information, which comprised the addresses and capital-gain information of cryptocurrency holders. She had studied the specialists and the private investors in society.

According to French media outlet Le Parisien, the tax agent was targeting several categories of clients, including prison officers and crypto-investors, and the police believe she was hired by an unknown sponsor.

Tax authorities now widely record cryptocurrency ownership in their databases. European citizens doubled their crypto exposure between 2022 and 2024. Governments also made it mandatory to report certain crypto holdings exceeding $5,000.

France is considering new digital property taxes that would impose a 1% annual levy on assets exceeding 2 million, including those held in self-custodial and offshore wallets.

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Physical Attacks Target Known Holders

There have been recurring attacks on crypto owners in France. These crimes have become more structured and follow clear patterns, with known holders facing threats of physical attacks and phishing.

Another major data breach preceded the tax leak. Hackers recently breached Ledger’s payment processor, Global-e, exposing crypto owners with linked email accounts.

A centralized system associates wallet addresses with personal identities, such that any use of the exchange can reveal ownership to the authorities. This surveillance promotes privacy solutions and mixers.

The tax authorities can require the payment of unrealized capital gain. Long-term holders may have to liquidate assets to meet their obligations, and reporting requirements create comprehensive ownership databases.

The case brings up concerns regarding data security in the tax authority. Deliberate and unintended leaks are both threats to crypto investors. And with law enforcement still probing the network of Ghalia C. and possible accomplices.