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Bitcoin-Qt is getting require large and is taking up over 10% of the space on my little laptop. Looking for an alternative, I saw Electrum. I downloaded the app and I'm able to connect to a server, but I'm wondering: what would the security implications be of not connecting to your own server?

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    I like to know what are the security implication of hosting your own server :-) – barrymac Mar 6 '13 at 13:36
  • Yeah, that's a good follow up question. You should ask it, and link it here! – Ramon Tayag Mar 7 '13 at 7:35
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    good idea, done: Vice Versa – barrymac Mar 7 '13 at 15:49
  • @barrymac Nothing, unless there's a security issue in Electrum. – Nick ODell Mar 7 '13 at 18:07
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A dishonest server could lie to you about how many bitcoins you have.

  • Don't all the Electrum servers connect to each other, so you can connect to any of them? If so, wouldn't they all hold the same information about your account? – Ramon Tayag Mar 7 '13 at 7:34
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    All of the honest servers will tell you the same thing. But a dishonest server could lie. – Nick ODell Mar 7 '13 at 7:48
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    This is not correct, they can give you false low wallet balances, but not falsely high ones. – Anonymous May 4 '15 at 3:47
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    @bitcoin sure it could - by not telling you about a transaction that spends one of your outputs. – Nick ODell May 4 '15 at 4:05
  • @NickODell are you sure about this? what you describe would be a client that fully trusts the server, however according to this talk from the author of Electrum (youtu.be/hjYCXOyDy7Y?t=718 <- exact moment) it says that Electrum is one level above the "server-trusting" wallets, that is, it's a SPV wallet; if this is still the case nowadays, I wonder what's the difference between this and a "server-trusting" wallet? – user1623521 Jan 17 '18 at 16:10
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They'll be able to track your transactions/addresses and tie them to your IP address, although this is mitigated if you are using proxies (you can also go through Tor).

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