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Hey, Big Spender! Don’t Steal My BTC

A new bug dubbed “Big Spender” has made its way into several popular bitcoin wallets.

Big Spender is a double spend hack that gives users the idea that they have received money when in fact, they have not. Instead, the person who has ultimately overtaken the transaction and the wallets in question has intercepted the crypto transaction and stolen the money and replaced it. This ultimately prevents the receiver from accessing their wallet and utilizing their funds while the hacker works to redirect them to a wallet in his (or her) control.

The problem was discovered by Zen Go, a Tel Aviv-based bitcoin and cryptocurrency enterprise. Representatives claim that the problem may have been integrated into millions of individual BTC and crypto wallets. Among the wallets known to be affected at the time of writing are Ledger Live, Edge and BRD (Bread).

Zen Go has already begun working on these wallets to remove their vulnerabilities. The company has also gotten in touch with the wallets’ original developers to inform them of the situation.

Senior software engineer at the Israeli company Oded Leiba explained in a statement:

The core issue at the heart of the Big Spender vulnerability is that vulnerable wallets are not prepared for the option that a transaction might be canceled and implicitly assume it will get confirmed eventually. This negligence has many faces. First and foremost, a user’s balance is increased on an incoming transaction while unconfirmed and is not decreased if the transaction is double-spent and thus effectively canceled.

But while Zen Go is moving quickly to ensure the vulnerability is taken care of ahead of time, not everyone is reacting positively. Both and Ledger and BRD staff claim that Zen Go is utilizing unclear verbiage to describe the situation and say that there is no double spending happening in any of the transactions in question.

Members of the Ledger security team explain:

There is no actual double spend being performed. The user funds stay safe. Nevertheless, the display of received transactions could be misleading.

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