Crypto Threat Model Now Includes the Home Address, Not Just the Wallet

Four armed men entered a home in northern France on September 20, restrained the parents and their two children with tape, and pressured the father—an IT employee in the crypto sector—to provide his access codes and transfer 40,000 euros. Investigators have not disclosed how the suspects identified him, and that unknown is where the industry's data vulnerability lies.

The father earns a salary as an IT worker in the crypto industry. Prosecutors have not yet revealed how the attackers targeted him.

Has France become the crypto crime capital of the world?

Four masked men broke into a family home in France, tied up the parents and their two children, and forced the father to transfer €40,000 in crypto.

The numbers are alarming:

• 77 crypto-related crimes and attempts in… pic.twitter.com/MnHBJ47QWA

— BeInCrypto (@beincrypto) September 21, 2026

Another episode that same month showed how easily such information can surface. On August 13, hardware wallet maker Trezor informed 13,689 customers that one of its shipping providers had suffered a breach, exposing […] The figure later exceeded 80,000.

[…] Together, they illustrate the same exposure from two directions: a database linking a home address to proof of crypto ownership, and the consequences when someone acts on that link.

BeInCrypto consulted experts from Hacken and Zama to explore what a provider owes its customers when a supplier leaks their identity, which data the industry should stop retaining, and how a client might detect that a custodian will […]

What “No Keys Compromised” Leaves Out

When Trezor disclosed the breach in August, it emphasised what had not occurred. Its own systems were not breached, it said, and its devices remained secure.

[…]

However, Dmytro Yasmanovych, Head of GRC and Security Operations at Hacken, noted that the absence of a stolen private key does not mean customers are safe.

[…] “Someone who knows your name, home address, and that you own a hardware wallet has information they can use to target you. […] You cannot do the same with your home address.” […] If a database links a crypto holder to their home, the consequences can reach their family as well, Yasmanovych added.

“So a provider can prevent anyone from accessing your funds and still leave you exposed in a much more personal way. The question is whether its security measures protect the customer, not just the wallet.”

The French Numbers Behind the Warning

France illustrates what that scenario looks like. Interior Minister Laurent Nuñez said in late June that authorities had recorded more than 70 crypto-related violent crimes.

[…}

Chainalysis, which counted publicly reported cases, logged 30 in France through mid-2026, compared with 19 for the whole of the previous year.

[…]

The firm attributes the rise most likely to a data breach. It cites a 2024 case in which a French tax official allegedly stole dossiers on high-net-worth crypto holders, including addresses and phone numbers, and sold them to criminal intermediaries. 

The family exposure Yasmanovych describes is visible in the same data. In France, more than 40% of incidents targeted a relative rather than the holder. Overall, home invasions made up 37% of documented attacks by mid-2026, up from 26% in 2023.

Chainalysis estimated that violent attacks on holders worldwide took more than $30 million in the first half of the year. This counts only attacks where the holder gave up funds.

[…]

The Data Behind the Target

These attacks require a target, and the target may come from a record someone kept. That makes data retention another security concern for the crypto industry. 

[…] So which piece of customer information should the industry stop collecting, or delete sooner than it does? […] He explained that a company might need one to arrange a delivery, but that does not explain why it should remain in a customer database for years. […] “I would remove the link between an order and a physical delivery address once the delivery is complete and there is no longer a business reason to keep it. The company can retain what it needs for tax and warranty purposes without keeping a complete record of where every order was delivered.” […] “In one case, a company had a ninety-day retention rule and written confirmation from its fulfilment partner that older records had been removed. Years of data was still sitting in their systems. […] If nobody checks whether the rule was followed, the rule offers little protection.”

The same responsibility applies to what happens after customer information is exposed. […] A name, home address, and proof of crypto ownership create a heightened level of risk. Someone whose address was leaked may need help arranging future deliveries without revealing it again. There should be a direct person or team to contact. If the supplier keeps data beyond the agreed retention period, customers should be told how that will be prevented and how deletion will be verified in the future.

[…] People need to know what happened, what they can do now, and whether the company has actually fixed the process that failed.”

Trezor’s response to its own breach can be measured against that list. It emailed affected customers individually, specifying whether their exposure was full or partial, and warned about phishing and, in September, physical security risks.

[…]

We are currently working on an Anonymous Delivery option, which we aim to have ready by September for the EU and by the end of the year for the US.

This gives you a safer way to order hardware wallets without linking the purchase to your home address or real-world identity.

-…

— Trezor (@Trezor) August 13, 2026

Can Privacy Technology Close the Gap?

The issue is not confined to data companies store off-chain. […] Rand Hindi said the Trezor incident highlights an off-chain data retention problem. 

[…] Hindi cited a BCG estimate that digital real-world assets could reach roughly 16% […] The three sub-categories sit at very different stages:

— Crypto: ~$3T market, current revenue pool
— Stablecoins: ~$300B, fastest-growing monetary layer… pic.twitter.com/tDfNzm7G6C— Sygnum Bank (@sygnumofficial) May 19, 2026 […] The executive pointed to fully homomorphic encryption (FHE) as one way to address this without sacrificing compliance.  […] When a regulator requires access, a permissioned threshold of key holders (compliance team) authorises decryption enforced at the protocol layer, not through a policy.” […]

Yasmanovych said zero-knowledge proofs can allow an exchange to demonstrate that it holds enough assets to cover customer balances without publishing every customer’s balance.

The exchange can therefore share evidence of its overall position without putting individual account information on […] The expert added that this does not mean the information becomes inaccessible. 

[…] Transaction amounts, timing, and wallet connections may remain visible, while identity documents and home addresses continue to sit in exchange, delivery, and payment databases.” […]

When the Credentials Are Real, and the Customer Is Not Free

The distinction between transaction privacy and personal safety becomes even more important when a customer is forced to authorise a transfer. A custody provider may have secure infrastructure and strong access controls. 

But those safeguards face a different test when a customer is coerced into handing over their assets. 

[…] It is less useful for understanding what happens when someone is forced to hand over their assets. […] For example, a customer with valid credentials requests a large transfer while someone is coercing them. […] A policy can require a second approval, but that does not tell you whether the approval is genuinely independent or whether staff can bypass it. […]

A custody system can work exactly as designed and still fail the person using it. […]

Where the Responsibility Now Sits

The attacks in France show how the risks around crypto extend past a compromised wallet or a stolen private key. A customer’s name, address, phone number, and proof of ownership become valuable once they sit in the same database. 

Privacy technology can limit what is exposed on-chain, but it does nothing to address information that companies and their suppliers keep elsewhere.

[…] It covers how assets are stored and moved, which customer data is collected, how long it stays accessible, and what happens when someone is forced to use their own credentials. Keys are part of that chain that the industry already knows how to protect.