The fake wallets are an escalation in phishing attempts following a 2020 data breach that exposed 272,000 customer addresses.
The crypto lender's data leak comes almost a year to the date after a similar data leak hit BlockFi.
The data, provided to a whistle-blower site, is not being made public over privacy concerns.
The bitcoin marketplace has halted withdrawal requests temporarily.
Sunday’s dump of customer emails and addresses serves as a sobering reminder that even a maker of hardware crypto wallets can become a data honeypot.
BTC Markets, one of Australia's biggest cryptocurrency exchanges, has accidentally exposed users' data, raising the risk of phishing attacks.
The exchange said customer funds are safe.
Vitalii Antonenko, 28, has been indicted for allegedly stealing and selling reams of payment card data, the proceeds of which he laundered in bitcoin.
The personal data of about 266,000 people registered with the fund may have been exposed.