A group of angry investors, led by attorney Liam Murphy, has taken legal action against Phantom Technologies and crypto exchange OKX. The investors claim that Phantom’s browser wallet had serious security flaws which led to the theft of over $500,000 in digital assets.

What’s worse, this alleged breach caused Murphy’s own crypto project, Wiener Doge, to crash by 99%, wiping out millions in value overnight.

The lawsuit, filed in the Southern District of New York, focuses on how Phantom stored private keys. According to the filing, the company kept users’ decrypted private keys in browser memory. This made it easier for hackers to access wallets without needing passwords or security checks.

On January 20, cybercriminals reportedly exploited this flaw in Phantom’s browser extension. They gained access to Liam Murphy’s crypto wallet and stole assets worth over $500,000. What followed was the collapse of his meme coin project, Wiener Doge.

At its peak, Wiener Doge had a market value of more than $3 million, with tokens trading at around $3.10 each. But after the hack, the coin’s value dropped to less than one cent. That’s a staggering loss for anyone holding the token.

The attacker didn’t stop at just stealing the tokens. They used Phantom’s own built-in “Swapper” tool to convert the stolen funds into Solana (SOL). This made it nearly impossible to recover. Murphy’s lawsuit claims that Phantom not only allowed this to happen but chose to remain silent about the risks.

The lawsuit makes seven major claims against Phantom, including negligence, breach of express warranty, and failure to disclose material facts. It also includes three claims against OKX for aiding and abetting the offenses.

Murphy alleges that Phantom was aware of the issue but did nothing to warn users. The suit also accuses OKX of playing a role, stating that its integration enabled the hacker to swap the stolen tokens easily. According to the filing, if OKX hadn’t provided routing and execution services, the attacker wouldn’t have been able to liquidate the funds so quickly.

Thirteen more plaintiffs, including Murphy’s friends and family members, joined the lawsuit after losing their investments in Wiener Doge. Together, they are asking for damages worth $3.1 per lost token, based on the coin’s value before the breach.

This lawsuit is not only about recovering money. It also raises bigger questions about crypto wallet safety, transparency from tech companies, and the responsibilities of exchanges when things go wrong.