A security researcher warned that the leaked shipping details could expose crypto holders to targeted scams and physical attacks.

Crypto hardware wallet maker Keystone has disclosed a website security breach that exposed customer information to attackers, raising concerns about targeted scams and physical attacks.

Keystone said Saturday that it detected suspicious activity earlier in the week and confirmed Friday, after reviewing API activity with Shopify, that an unauthorized third party had accessed customer shipping information. This included names, contact details, shipping addresses and other order details, such as items bought.

“We’ve blocked access, fixed the vulnerability, opened an investigation, and are emailing affected customers,” said the company.

Keystone warned that the exposed information could be used for targeted phishing attacks. However, security researcher Taylor Monahan also raised concerns that leaking shipping addresses could expose customers to physical attacks and kidnappings.

Blockchain security firm CertiK recorded 52 verified wrench attacks worldwide in the first half of 2026, up 33% from 39 during the same period last year. Such crimes, commonly called “wrench attacks,” involve using physical threats or violence to force cryptocurrency holders to surrender their assets.

“Again, we’re truly sorry to everyone affected,” Keystone said. The company did not disclose how many customers were impacted.

The breach has also raised questions about Keystone’s handling of older customer information.

In a 2023 blog post, Keystone said it had reduced its customer data retention period to 180 days following security incidents affecting other hardware wallet manufacturers.

However, some customers said they received breach notifications despite purchasing their devices more than two years ago, raising questions about what information Keystone retained and whether the notifications indicate that older order records were not deleted as promised.

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