If you use Electrum, in case you get a error message that tells you to update please ignore (ongoing phishing attack).

Details here: https://github.com/spesmilo/electrum/issues/4968

copy paste from SomberNight in the github issue:

TL;DR: There is an ongoing attack against users where servers raise exceptions when a client broadcasts a transaction; in this case the error text is displayed as is in the client GUI. The attacker has spawned lots of servers on different /16 IPv4s to increase his chances of being connected to. The error messages are trying to get the user to download and install malware (disguised as updated versions of electrum).` 

apparently previous Electrum versions allow richtext in error messages sent by the server, so the upgrade warning might look legit to people…

Always remember to verify pgp / gpg signatures of bitcoin software you install.

submitted by /u/fmlnoidea420
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Bitcoin – The Currency of the Internet

Electrum Personal Server beta release

Electrum Personal Server is an implementation of the Electrum wallet server protocol that allows users to point their Electrum wallet at their own full node. It is compatible resource-saving features like pruning, blocksonly and disabled txindex. It is much less resource-intensive than other Electrum servers because it only stores the user's own addresses, instead of every address that was ever used. As such it makes tradeoffs, namely losing Electrum's "instant on" feature.

Full node wallets are important in bitcoin because they are an big part of what makes the system be trustless. No longer do people have to trust a financial institution like a bank or paypal, they can run software on their own computers. If bitcoin is digital gold, then a full node wallet is your own personal goldsmith who checks for you that received payments are genuine. You wouldn't accept large amounts of cash or gold coins without checking they are actually genuine, the same applies for bitcoin.

Full node wallets are also important for privacy. Using Electrum under default configuration requires it to send all your bitcoin addresses to some server. That server can then easily spy on you. Full node wallets like Electrum Personal Server would download the entire blockchain and scan it for the user's own addresses, and therefore don't reveal to anyone else which bitcoin addresses they are interested in.

Right now using Electrum Personal Server is the easiest way to use a hardware wallet backed by your own full node. It is very lightweight, being a small python script that barely uses any CPU or RAM; much less than the full node it's connected to. Hopefully Electrum Personal Server can be part of the solution in putting full node wallets into the hands of as many people as possible.

The project is now in beta release: https://github.com/chris-belcher/electrum-personal-server

It now has all the essential features to make it practical for use; Merkle proofs, deterministic wallets, bech32 addresses, SSL, Core's multi-wallet support. Along with the features that were in the alpha release of tracking new transactions, confirmations, block headers, importing addresses.

Further Reading:

submitted by /u/belcher_
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Bitcoin – The Currency of the Internet

'Bitcoin-stealing Malware': BTC Wallet Electrum Exposes Malicious Copycat

Popular bitcoin wallet service Electrum has released evidence demonstrating that copycat client “Electrum Pro” is “bitcoin-stealing malware.” First launched in 2011, Electrum has long been one of bitcoin's most popular wallet clients, and many users trust the wallet for its proven security, ease-of-use, and …
Google Alert – bitcoin