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June 28 (Xinhua) -- Bitcoin desktop wallet client Electrum has released a 4.0 beta version, adding several important updates to support the Lightning network. Electrum primarily adds features such as PSBT (partially signed Bitcoin transactions), Lightning Network, watchtowers (暸 watchtowers), and Submarine Swaps (subliminal switching).

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Electrum is a popular software wallet that works by connecting to a dedicated server. These servers receive a hash of the Bitcoin address in the wallet and reply with transaction information. Electrum Wallet is fast and has few resources, but by default, it connects to these servers and can easily monitor users. In addition to Electrum, some other software uses public Electrum servers. By 2019, it is a faster and better alternative to BIP37.

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When an Electrum wallet queries a third-party Electrum server, the server can link two transactions together and know which address is a zero address.

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Electrum is a world-renowned Bitcoin light wallet with a long history of multi-signature support and a very broad user base, many of which like to use Electrum as a cold wallet or multi-signature wallet for Bitcoin or even USDT (Omni). Based on this usage scenario, Electrum is used less frequently on the user's computer. The current version of Electrum is 3.3.8, and previous versions of 3.3.4 are known to have "message defects" that allow an attacker to send an "update prompt" through a malicious ElectrumX server. This "update tip" is very confusing to the user, and if you follow the prompt to download the so-called new version of Electrum, you may be tricked. According to user feedback, because of this attack, stolen bitcoins are in the four digits or more.

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In addition to the Bloom filter, SPV clients rely on the Merkle tree-binary structure, which contains a list of all hashs between the block (apex) and the transaction (leaf). With the Merkle tree, only a small portion of the block (called the Merkle root) needs to be checked to prove that the transaction has been accepted by the network.

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Lightweight Bitcoin Wallet Electrum announced that the next version will support Lightning network payments, implemented with Python, an electrum network node where wallet users do not need to run Lightning network nodes themselves to make payments, and electrum's Lightning network nodes have now been merged into the Electrum master branch.

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The Healthy Security Lab is concerned that Nearly 250 bitcoins have been stolen in a recent hacking attack on an Electrum wallet. This attack, confirmed by Electrum, involves creating a fake version of the wallet to trick users into providing password information. Electrum responded on Twitter that "this is an ongoing phishing attack on Electrum users and advised users to download wallet apps from the official website" and that The Healthy Security Lab advised users not to install an unknown source of Electrum wallets to avoid being tricked.