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The veteran Bitcoin desktop wallet client Electrum has released the official version of 4.0, adding support for several important updates, such as the Lightning network, and has released an updated version 4.0.1. Electrum adds features such as PSBT (partially signed Bitcoin transactions), Lightning Network, watchtowers (暸 watchtowers) and Submarineswaps (subliminal switching) for version 4.0.

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Popular wallet developer Electrum has released an emergency patch for a key vulnerability in its Bitcoin wallet. The vulnerability allows any website hosting electrum wallets to potentially steal a user's cryptocurrency. A vulnerability means that the password is exposed to the JSONRPC interface, implying that the hacker has full control over the wallet. The first patch failed to fix the problem, forcing Electrum to release a second update on Sunday night.

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Hackers have lost more than 200 bitcoins ($750,000) to users since December 21 by attacking the Electrum Bitcoin wallet infrastructure. It is reported that in this attack, the wallet's mobile program will urge users to download malicious wallet updates from the unauthorized GitHub repository, until early December 27 hackers appear to have temporarily stopped the attack, but the administrator of electrum wallet expected a new attack soon, because although the administrator has taken steps to reduce the availability of attackers, but the core vulnerability has not been updated patches to fix. (zdnet)