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Users of Bitcoin wallet Electrum are facing phishing attacks, according to Hackers broadcast messages to electrum clients through a malicious server, prompting the user to update to v4.0.0, and if the user is prompted to install this backdoor-carrying client, the private key is stolen and all digital assets are stolen. At the time of writing, at least 1,450 BTCs worth approximately $11.6 million had been stolen from phishing attacks that forged Electrum upgrade alerts. Devi Security Labs hereby suggests that versions of Electrum below 3.3.4 are vulnerable to such phishing attacks, and users using Electrum Wallet are requested to update to the latest version of Electrum3.3.8 via the official website (, which has not yet been officially released v4.0.0, and do not use the link in the prompt message to avoid asset losses.

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But what should the wallet app do if the user imports less than 32 bytes of private key? Some wallet apps, such as imToken, simply reject this malformed data and prompt the user to enter an invalid private key. There are also wallets (such as the case below) that help users fill in 0/truncate into 32 bytes in the background and successfully import the modified private key to force consensus.