Crypto: They thought they would find a major wallet
The three men who allegedly entered the home may not have arrived there by chance. The case comes as physical attacks targeting crypto holders are increasing in France. Bref Crypto had already recorded 77 crypto-related kidnappings and extortion cases in the first half of 2026.
In Taverny, the attackers allegedly sought to force the father to make cryptocurrency transfers. His wife and their 10-year-old child were tied up. The father was reportedly assaulted and subjected to shocks from a stun gun. The criminals apparently expected access to a much larger fortune.
They allegedly left with a few hundred euros and various items from the house. As for the crypto, the targeted wallet was worth only around €100.
Six men appeared before an investigating judge on September 11, 2026. According to the Pontoise public prosecutor’s office, cited by Le Parisien, they were notably charged with organized-group theft and extortion with a weapon, organized-group hostage-taking and criminal conspiracy.
Old data can become dangerous
The case takes on another dimension when considering how some targets are selected.
The attackers allegedly had information indicating that the family held significantly more crypto assets than it actually did at the time of the incident. The case is linked in particular to data associated with Waltio, a French service used to calculate cryptocurrency taxes.
Waltio acknowledged that a security incident had exposed certain information, including email addresses, gains or losses recorded in 2024 and, most importantly, the cryptocurrency balances used for tax calculations as of December 31, 2024. The company said that no private keys, wallet addresses, banking data or information enabling funds to be moved directly had been compromised.
In other words, a database does not need to contain a seed phrase to become dangerous. A simple outdated estimate of someone’s assets may be enough to convince criminals that the person still holds tens or hundreds of thousands of euros.
The Taverny case takes this logic to an extreme: the presumed assets and the actual assets appear to have completely diverged.
It recalls another recent case, in which tenants were mistakenly held hostage near Rennes by individuals looking for the property owner and his cryptocurrencies.
Crypto security is becoming physical too
The phenomenon now extends far beyond hacking. France’s National Gendarmerie said in September that kidnappings, hostage-taking and attempts linked to cryptocurrency ownership are rising sharply in France. It cited 135 incidents recorded since 2023, including 47 cases opened between January and mid-April 2026.
Law enforcement agencies have pointed in particular to the role of data leaks. Some make it possible to link an identity or email address to an assumed level of wealth. Criminals can then supplement this information through social media, compromised databases or other sources.
The problem is serious enough that the French state has adapted its security arrangements. Crypto professionals may notably receive home security assessments, briefings from the GIGN, RAID or BRI, and enhanced contact arrangements with security forces.
In this context, securing a seed phrase or using a hardware wallet no longer covers the entire risk surface. Bref Crypto also reported a kidnapping plot directly targeting an American investor’s bitcoins, following a period of surveillance of his family.
Taverny adds another data point: even an almost empty wallet can become dangerous when old financial information continues to circulate. The criminals thought they would find a fortune. Yet a family suffered violence over approximately €100 in crypto.
In brief
- A family was held hostage and assaulted in Taverny on July 13 over its cryptocurrencies.
- The targeted wallet ultimately contained only around €100.
- Six men were charged on September 11, 2026.
- The case highlights the physical risk created by the circulation of outdated data about crypto holdings.
