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Author Topic: [ANNOUNCE] Electrum - Lightweight Bitcoin Client  (Read 242941 times)
EhVedadoOAnonimato
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November 15, 2011, 08:50:05 AM
 #41

Deterministic wallet is great! Every client should at least have the option, if it is truly safe. Not having to back up your wallet all the time is a good thing.

I don't like the client-server solution though. There's a big privacy issue there. The server knows all your addresses and transactions. And if there's no https, it might be even worse. I would only use such client-server solution if I'm running the server myself, but then, better to run a lightweight client like BitcoinJ.
If setting up a server becomes easy this might be a good thing for families or roommates who trust each other, and want to use bitcoin on the same home network. It could save them some bandwidth.

Congratulations for your client, Thomas!
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EhVedadoOAnonimato
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November 15, 2011, 08:58:14 AM
 #42

Any plans to make that a https connection to a server for added privacy possibility (man listening in the middle)? I suppose connecting to a electrum server across tor would work just as well against that anyway.

Only if you're talking about a server which is a tor hidden service. Connections to hidden services are encrypted and authenticated, end-to-end. If only the client is using tor to connect to a normal server (public IP), then it's much worse, you must use ssl in this case, as otherwise the exit-node can do pretty much what he wants.

So, if the current client does not support ssl connections, do not put it behind Tor, unless you're accessing a hidden server.
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November 15, 2011, 09:54:57 AM
 #43

Electrum 0.25 Windows Binary 1

ThomasV
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November 15, 2011, 02:06:44 PM
 #44

Thanks for the new binary.
In version 0.25, I added a few options to the text mode interface.

 -d <directory> : use a different directory for your wallet. Example:
Code:
pyton electrum.py -d /opt/my_wallet_dir

options to be used with the 'addresses' command:
 -k : display private keys
 -a : display all addresses, including change addresses
 -b : display the balance at addresses

Example:
Code:
python electrum.py addresses -ak
will display all your addresses and private keys
(in base58, so you can then import them in another client)

 -f <fee>  (option to be used with the 'sendto' or 'mktx' commands)
set the miner fee for the transaction
Example:
Code:
sendto -f 0 19mP9FKrXqL46Si58pHdhGKow88SUPy1V8 0.1
Note: mktx dumps the transaction in hexadecimal form but does not send the transactino to the network

Electrum: the convenience of a web wallet, without the risks
Ryland R. Taylor-Almanza
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November 15, 2011, 09:32:38 PM
 #45

ok, thanks to RylandAlmanza for reporting that bug.
I just released version 0.25, where it should be fixed.
Changelog:
 * client asks for a new session after creating a change address
 * command-line options (will document them later)
Nice work! Smiley
ThomasV
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November 16, 2011, 05:34:47 PM
 #46

ok, I just released version 0.26

Changelog:
 * https connections are now supported ( port 443 )
 * new 'sendtx' command to broadcast a raw transaction to the network.
 * a command-line help is available for each command
 * the server listens to #electrum on irc in order to discover peers
 * server statistics here: http://ecdsa.org/electrum.php

Electrum: the convenience of a web wallet, without the risks
Ryland R. Taylor-Almanza
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November 16, 2011, 10:52:58 PM
 #47

https://bitcointalk.org/index.php?topic=52035.msg621071#msg621071

Does electrum auto-correct BTC addresses?
ThomasV
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November 17, 2011, 01:10:53 AM
 #48


indeed, there was a bug in the address verification.
I just released version 0.26b that fixes this problem.

Electrum: the convenience of a web wallet, without the risks
BTCurious
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November 17, 2011, 10:30:02 AM
 #49

Electrum 0.26b Windows Binary 1

Jaagu
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November 17, 2011, 03:45:22 PM
 #50

I am no programmer. Just plain windooze (XP) user.

I did my best, according the guide http://ecdsa.org/electrum/ :
1) installed python-2.7.2.msi
2) installed pygtk-all-in-one-2.24.0.win32-py2.7.msi
3) installed pycrypto-2.3.win32-py2.7.msi
4) clicked Electrum-0.26b-build1.exe

-> nothing happens (smth flashed through command prompt).

To see error messages I run Electrum-0.26b-build1.exe through command prompt.

It gives me error messages:



I have to admit, I cannot do any more.
Unless someone compiles windows executable (without any dependancies), a hole lot of people just gives up on Electrum.
BTCurious
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November 17, 2011, 05:41:45 PM
 #51

Funny, that. The binary I posted actually should be without any dependencies! So you didn't need to install python, or pygtk, or pycrypto.

What's also funny, is that your error messages refer to the install directory of pyinstaller on my system.

I'm not sure what's going on...

BitcoinBug
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November 17, 2011, 05:42:38 PM
 #52


1) installed python-2.7.2.msi
2) installed pygtk-all-in-one-2.24.0.win32-py2.7.msi
3) installed pycrypto-2.3.win32-py2.7.msi
4) clicked Electrum-0.26b-build1.exe

There are two ways to run electrum:
1) run Electrum-xx-build.exe
2) Install python, install pygtk-all-in-one, install pycrypto, install python-ecdsa (!!), extract electrum.tar.gz and run client\electrum.py

There are some glitches with PyInstaller, it didn't work on my VirtualBox XP either. So I went the second way...

P.S.: If you use only gui in windows, you can rename electrum.py to electrum.pyw, this should prevent command box from appearing.
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November 17, 2011, 09:56:05 PM
 #53

Any plans to make that a https connection to a server for added privacy possibility (man listening in the middle)? I suppose connecting to a electrum server across tor would work just as well against that anyway.

Only if you're talking about a server which is a tor hidden service. Connections to hidden services are encrypted and authenticated, end-to-end. If only the client is using tor to connect to a normal server (public IP), then it's much worse, you must use ssl in this case, as otherwise the exit-node can do pretty much what he wants.

So, if the current client does not support ssl connections, do not put it behind Tor, unless you're accessing a hidden server.

Yes. But only connecting to trusted Electrum servers over plain text http seems to be a requirement for this system work as a default position no? Or is there some way that a client can figure out if the server (or interceptors) is not just spoofing an Electrum server for nefarious purposes?

A client behind tor to a trusted server removes traceability of transacting BTC addresses to originating wallet IP, since they could have come from anywhere on the tor network. An end-to-end ssl connection is obviously better but allows the server to know the IP of the transacting wallet addresses.

The ultimate would be a federation of trusted Electrum tor hidden servers, I agree. No way for server (or interceptors) to link transacting Electrum client wallet BTC addresses with originating IPs. (Of course there are many other ways to do this besides, drive-by public wifi, etc)

ovidiusoft
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November 18, 2011, 08:23:23 AM
 #54

Yes. But only connecting to trusted Electrum servers over plain text http seems to be a requirement for this system work as a default position no? Or is there some way that a client can figure out if the server (or interceptors) is not just spoofing an Electrum server for nefarious purposes?

Wouldn't this be solved by using electrum.php on a regular https server? You can then have the https server available through tor or directly and the only unencrypted connection will be locally between electrum.php and the Electrum server.

Of course, I do aggree that all connections to the Electrum server should be mandatory encrypted.
ThomasV
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November 18, 2011, 08:27:56 AM
 #55

Yes. But only connecting to trusted Electrum servers over plain text http seems to be a requirement for this system work as a default position no? Or is there some way that a client can figure out if the server (or interceptors) is not just spoofing an Electrum server for nefarious purposes?

Wouldn't this be solved by using electrum.php on a regular https server? You can then have the https server available through tor or directly and the only unencrypted connection will be locally between electrum.php and the Electrum server.

Of course, I do aggree that all connections to the Electrum server should be mandatory encrypted.

I am not sure if there is a difference between what you describe and how it currently works.
if you configure your client to use port number 80 or 443, it will use http (res. https) to connect to the server.



Electrum: the convenience of a web wallet, without the risks
ThomasV
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November 18, 2011, 08:40:05 AM
 #56

I don't like the client-server solution though. There's a big privacy issue there. The server knows all your addresses and transactions.

this is only due to the fact that there is currently only one server available.

In the future I can imagine that there will be several servers running. When that happens, it will be possible for a paranoid client to connect to several servers, and to disclose only a subset of his addresses to each of them.


Electrum: the convenience of a web wallet, without the risks
ovidiusoft
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November 18, 2011, 09:50:03 AM
 #57

I am not sure if there is a difference between what you describe and how it currently works.
if you configure your client to use port number 80 or 443, it will use http (res. https) to connect to the server.

My python is a little rusty, but I was under the impression that the Electrum server doesn't encrypt connections (or at least it's not clear from the code), not even on port 443. I didn't have time to test, but I am planning on rolling a public Electrum server on btcnode.novit.ro (it's a bitcoin fallback node) so I will follow the developments closely...
ThomasV
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November 18, 2011, 10:56:00 AM
 #58

I am not sure if there is a difference between what you describe and how it currently works.
if you configure your client to use port number 80 or 443, it will use http (res. https) to connect to the server.

My python is a little rusty, but I was under the impression that the Electrum server doesn't encrypt connections (or at least it's not clear from the code), not even on port 443. I didn't have time to test, but I am planning on rolling a public Electrum server on btcnode.novit.ro (it's a bitcoin fallback node) so I will follow the developments closely...

oh, you are right, I should use httplib.HTTPSConnection if the port is 443.
I previously used urllib2 instead of httplib, and with that library it was not necessary to make a distinction. I guess I forgot then.
I just fixed that: https://gitorious.org/electrum/electrum/commit/77a198e810ffec89d5bcb23583f1a0593247ffe8

Electrum: the convenience of a web wallet, without the risks
ovidiusoft
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November 18, 2011, 11:30:00 AM
 #59

Great! I'll test when I'll have some free time and put up a public server online.
ThomasV
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November 21, 2011, 09:35:58 AM
 #60

Great! I'll test when I'll have some free time and put up a public server online.

Awesome!
Note that the server will join an irc channel in order to discover peers.
The server has a 'peers' command that returns the list of other servers on the channel; it is not used by the client at this point.

Electrum: the convenience of a web wallet, without the risks
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