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1941  Bitcoin / Electrum / Re: Program doesn't start from application menu in Centos 7 on: October 17, 2016, 07:01:00 PM
So you can run it as root but not as an unprivileged user? Is that correct? Does it work when you type electrum in a terminal as an unprivileged user? If yes then the problem is simply with the launcher shortcut. Otherwise if you can't run it at all as an unprivileged user then it looks like a permissions problem.

Try uninstalling electrum and protobuf. Then reinstall electrum. It'll pull in protobuf anew and perhaps that'll fix it.

If this doesn't work then uninstall electrum as root. Then reinstall it as an unprivileged user in your home directory. You can simply place a link to the binary in your home directory and use it that way.
1942  Bitcoin / Electrum / Re: Electrum 2.7.0 on: October 17, 2016, 04:43:43 PM
So how many bitcoin receiving addresses do i have then?  So i have 35 different bitcoin receiving addresses?

You have an unlimited number of addresses. These are just the ones that have been generated to date. More will be generated once you start using addresses.
1943  Bitcoin / Electrum / Re: Will Electrum stay backward compatible? on: October 17, 2016, 12:27:20 PM
Will Electrum stay backward compatible?

Always. See first paragraph:

https://bitcointalk.org/index.php?topic=1641720.msg16513872#msg16513872
1944  Bitcoin / Electrum / Re: Electrum 2.7.0 on: October 17, 2016, 12:25:53 PM
My receive page looks like this


Receiving Address:  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Description: 

Requested amount        BTC

Request Expires      1 day



There is only one receiving address.  Unless there is something in the settings i have to change?

press ctrl+a to bring the addresses tab into view. you will see all your receiving addresses there.
1945  Bitcoin / Electrum / Re: Program doesn't start from application menu in Centos 7 on: October 17, 2016, 12:10:29 PM
Here is the output:
Code:
$ head `which electrum`|grep '#\!'|tr -d '#!'
/usr/bin/python

Code:
$ which electrum
/usr/bin/electrum

Code:
$ /usr/bin/python -V
Python 2.7.5
Code:
$ which python
/usr/bin/python

When I run electrum as root in a terminal, it starts but not as user.

So you've installed electrum twice. Once in /usr/bin/electrum and once in your home folder.

Edit: I think it would be best if you removed the version of electrum in your home folder and reinstalled it as root. So as root download the tarball from the electrum site, verify the GPG sigs and run install again:

Code:
version="2.7.8"
wget https://download.electrum.org/$version/Electrum-$version.tar.{gz,gz.asc} https://github.com/spesmilo/electrum/raw/master/pubkeys/ThomasV.asc
gpg --import ThomasV.asc
gpg --verify Electrum-$version.tar.{gz.asc,gz}

Once the download is verified ("Good signature"), install it:

Code:
pip2 install Electrum-$version.tar.gz

Remove the version in your home folder:

Code:
rm -rf /home/user/Electrum/Electrum-2.7.2
1946  Bitcoin / Electrum / Re: Electrum 2.7.0 on: October 14, 2016, 02:44:47 PM
hi there.  Does that mean almost no one has electrum 2.7 and everyone else has the old version?  The electrum that was on my old computer was electrum 2.6.4.


So if i have a copy of electrum 2.6.4, can install that one and not use 2.7?


Thanks.

Yes you can install 2.6.4 over 2.7. But it's recommended to use the latest version which is 2.7.7.
There's no way to know who has 2.6.4 and who has 2.7 and it doesn't matter. ThomasV only said that it was fixed in 2.7.1, he meant nothing else.

If you have the seed saved You shouldn't be too worried to try other versions ONLY to see if they will open or not.

There was a change in the wallet file format in 2.7.0 so 2.6.4 electrum won't be able to read your wallet file. You will have to restore from seed.
1947  Bitcoin / Electrum / Re: Program doesn't start from application menu in Centos 7 on: October 10, 2016, 10:58:46 AM
Please do post the output of
Code:
which electrum
1948  Bitcoin / Electrum / Re: Can I continue to use old wallets indefinitely (with > 2.7)? on: October 10, 2016, 10:55:46 AM
Hi,

I upgraded from 2.6 to 2.7 and it split my old wallet into two files:

* default_wallet.deterministic
* default_wallet.imported

The thing is, I don't want to create a new wallet where I would send all of my balances in my previous wallets because I have hundreds of used (with a balance) addresses.

Can I continue to use these 2 wallets indefinitely with future versions of Electrum? Will it be supported? Is it secure?

Thanks!

The deterministic wallet will definitely continue to be supported. ThomasV the chief developer has said that it is part of the social contract between electrum developers and its users that seed backups continue to work forever. So maintaining backward compatibility with old deterministic wallet types is a priority for him.

However there are certain advantages to making a new wallet:

- Newer wallets use compressed public keys which take up less space on the blockchain. so you may save some small amount in transaction fees over time. It will also be better for other bitcoin users because the chain won't get bloated by transactions involving uncompressed public keys.
- Hundreds of addresses might soon turn into thousands and at that point electrum will take too long to load and do transactions. Unfortunately Electrum can't handle thousands of addresses in a wallet. So better to send your money to a fresh wallet. You can still use the old wallet if you ever need to.

To create a new wallet use the file > new/ restore option. To open it use file > open. To create a shortcut use the -w switch.
1949  Bitcoin / Electrum / Re: Program doesn't start from application menu in Centos 7 on: October 09, 2016, 05:52:52 PM
maybe you have more than one python version on your system.

First:

Code:
head `which electrum`|grep '#\!'|tr -d '#!'

It should output something like /usr/bin/python. Then run the following (replace /usr/bin/python with the path from the last command)

Code:
/usr/bin/python -V 
python -V
which python

Post the output of the above 3 commands

1950  Other / MultiBit / Re: can anyone clarify how secure is Multibit HD actually ? on: October 06, 2016, 02:22:14 PM
i have been told that MB HD is less secure for large amounts than MB classic
 due to the way the developers  fees are extracted and also privacy can be compromised more easily  ......


is there any truth in this ?

is there any danger of theft or could the developers take more than the agreed amount etc  ?

(i have kept cold storage in mb classic for years and found the security and convenience to be  excellent btw  )

no, you've been misled. none of what you said is correct. multibit HD is better than classic.
1951  Bitcoin / Electrum / Re: Electrum exposing addresses to public? on: October 06, 2016, 02:20:26 PM
Thank you for the answer but are the new version of multibit secure?
Yes. I don't recommend Multibit because it makes it harder to do advanced tasks like import/export private keys, signing raw transactions, etc. However, if you don't need any of that, then Multibit is fine.

I am just trying out Multibit and it seems to be much better than electrum at first look,no idea why more people recommend electrum
But i created a test wallet and it gives timestamp and then on verification step it ask to put timestamp or leave blank if unknown but if i leave blank i cant press next and if i put a fake timestamp it also cant press next so have to give real timestamp,and cant use without the timestamp?

The timestamp helps it sync your wallet faster. Technically it can sync your wallet without the timestamp but why take a risk? Backup both the timestamp and the wallet words.

BTW you should ask these questions in the multibit forum:
https://bitcointalk.org/index.php?board=99.0
1952  Bitcoin / Electrum / Re: Computer No Longer Works, Restoring Electrum? on: October 06, 2016, 02:16:46 PM
To remove the wallet file on the computer you are NOT going to use find the electrum data directory and then delete it. The location of the data directory depends on your operating system:
http://docs.electrum.org/en/latest/faq.html#where-is-my-wallet-file-located

Uninstalling electrum from add/remove programs will NOT remove the data directory. You have to delete the data directory manually.
1953  Bitcoin / Electrum / Re: Computer No Longer Works, Restoring Electrum? on: October 06, 2016, 01:57:38 PM
After i enter the 12 word phrase, do i need to check add a passphrase to this seed or BIP39 seed?  I have no idea what is this.

Don't check any boxes.

Quote
Also where is the option to add a password that you have to enter before you send your bitcoins?  For example when i restored my bitcoins in my computer, i put the 12 word phrase and put a password to encrypt my bitcoin?  Thus if i dont do this, anyone with access to my laptop could send bitcoins easily since there is no password.  Where is the option for this on electrum 2.7?

It'll come in the next step after you enter the seed.

You ask a lot of questions here. You should just try stuff. Your computer won't bite!
1954  Bitcoin / Electrum / Re: Computer No Longer Works, Restoring Electrum? on: September 24, 2016, 04:39:07 PM
okay i put the 12 word phrase and then put in a new password.  So just to confirm this is the password that is used to send bitcoins right?  Because in my laptop, i had to put a password to put in my password before sending the bitcoin.


So you are telling me i were to forget the password, that isn't an issue since i have the 12 word phrase is that correct?  And thus when i reinstall electrum, well it won't ask for that password of mine and thus i have the option to put password or not?  Thus having the 12 word phrase is enough for everything? 

Electrum stores the wallet in your user directory. When you uninstall electrum the wallet is not removed. If you reinstall it it will detect that an old wallet is still there and open it up by default. To get it to create and/or restore another wallet you have to use the file -> new/restore option and later the file >open option to open a specific wallet file.

The 12 word phrase lets electrum recreate all your private keys and corresponding addresses. The wallet file stores transaction and address labels that cannot be recovered with just the 12 word seed. So you can access your bitcoins but the labels will not be there unless you keep a copy of the wallet file too.

The password encrypts the 12 word phrase before it is written to your hard disk. The idea is that if someone malicious gets their hands on your computer, either locally or remotely, they can't spend your bitcoin until and unless they enter the password.

Quote
I think that would be very bad idea because anyone that has access to your computer could send the bitcoin easily right if they search your computer?  I haven't sent any password yet but i am happy that i was able to restore it on another computer.

Exactly. Setting a password is good.

Quote
The thing is i will not use this computer anymore soon.  Its basically a computer im using to access my electrum because my laptop went down on me and i have to buy a new laptop.  So how would you suggest i go with this?  Just do the same thing right now on the new laptop when i get one... then erase electrum on this desktop?  Thus add/remove programs and delete the program? 

After uninstalling electrum from add/remove you should remove the wallet file too. You will find this in the data dir:

http://docs.electrum.org/en/latest/faq.html#where-is-my-wallet-file-located
1955  Bitcoin / Electrum / Re: Computer No Longer Works, Restoring Electrum? on: September 24, 2016, 01:51:36 PM
Select:

- Restore a wallet or import keys

- Standard wallet type

Then it'll ask you to enter your seed. So type those 12 words in. If they are correct the next button at the bottom of the window will be clickable ( i.e NOT grayed out). Click on that and it'll generate addresses and ask you to set a password for your restored wallet. This password has nothing to do with your previous password. It's a new password and if you like it can be the same as your old one or a different one. You will be asked for it when spending your bitcoins.

You can always restore from the 12 words only. The 12 words alone are a sufficient backup.
1956  Bitcoin / Electrum / Re: Formatted harddrive on: September 23, 2016, 09:36:35 AM
how many words are in your seed? For a 2fa wallet it should be a 25 word seed. Is that what you have?

BTW choosing 2fa as the wallet type when restoring the wallet is the correct approach for a 2fa wallet.
1957  Bitcoin / Electrum / Re: how to import a private key in Electrum? on: September 21, 2016, 07:26:30 AM
Best thing to do is to create a new wallet with the private key on the paper wallet and send the coins from that wallet to whereever you want to use it, so it becomes restorable using the seed of that wallet.

Sweeping accomplishes the same thing in less steps. That's why I first talk about sweeping the private key in my post above.
1958  Bitcoin / Electrum / Re: how to import a private key in Electrum? on: September 20, 2016, 08:57:53 AM
You can sweep the private key which is better than importing it. Here's how to do that:

http://docs.electrum.org/en/latest/faq.html#can-i-sweep-private-keys-from-other-bitcoin-clients

If you want the private key to become a part of your wallet then you have to import it. I don't recommend this but if you really want to do it then it can be done by creating a new wallet:

http://docs.electrum.org/en/latest/faq.html#can-i-import-private-keys-from-other-bitcoin-clients
1959  Bitcoin / Bitcoin Technical Support / Re: [Bounty] 0.2 BTC - bitaddress.org Temp / Cache Files on: September 19, 2016, 02:40:58 PM
When you create a Paperwallet on bitaddress.org you get the Text (Address,Key) and 2 QR Picture for every Wallet you generate...
Maybe there is a way to find the pciture it in the Cache/Temp from Chrome ?

That's dynamically generated by javascript in the browser so chrome is not going to cache that. I think you are out of luck on this one. I suggest writing it off as a loss.
1960  Bitcoin / Electrum / Re: Electrum won´t send my bitcoins to another wallet! on: September 14, 2016, 10:45:54 AM
When I try to transfer, the status say: Partially signed. And no money gone.
If I type my 2FA code after my password, I get: Invalid otp


Can anyone please help!?

Thank you!!

iZ

Invalid otp means the 2fa code you typed in is incorrect. Usually this happens because the time on your PC and/or your mobile are wrong. So make sure the clock on both those devices is set correctly.
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