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1541  Bitcoin / Electrum / Re: How to get the redeem script form P2SH address? on: June 28, 2017, 03:19:42 PM
You can't get it from the address alone. You have to construct it yourself using the 3 address specific public keys which can be obtained by right clicking on the address and choosing public keys. You have to put the public keys in lexicographic order and then use the createmultisig command line option in electrum.

For example:

Code:
abdussamad@linux:~/temp/electrum> electrum createmultisig 2 '["04351dfbaccad6c4c49db52062b711ec79b3cb364b490d9477cb3f4f66ac923c3faac1c0bfcd6edbd58c5b69ee8376fc4f9a935243602b451e92ce8ade093b9c74","04dec12260ff33763e4f52885fe05b8d7ed3017a286bf108b9ebe9cceae495525768b24a0d6519d602581bf2e12982b30b2f14405e504c3bd20b67deecc02ae3dc"]'
{
    "address": "3KbGQXxWrScoMdZBnb21ZJ8UrKZbQhCFMu",
    "redeemScript": "524104351dfbaccad6c4c49db52062b711ec79b3cb364b490d9477cb3f4f66ac923c3faac1c0bfcd6edbd58c5b69ee8376fc4f9a935243602b451e92ce8ade093b9c744104dec12260ff33763e4f52885fe05b8d7ed3017a286bf108b9ebe9cceae495525768b24a0d6519d602581bf2e12982b30b2f14405e504c3bd20b67deecc02ae3dc52ae"
}


Type `electrum help createmultisig` in a terminal to get more details.
1542  Bitcoin / Electrum / Re: Private key in Electrum on: June 27, 2017, 01:59:21 PM
As a matter of fact, i think electrum only allows WIF compressed keys, not WIF keys (it has been a while since i last swept a wallet).

It'll take uncompressed keys too.

OP go ahead and sweep your key already!
1543  Bitcoin / Electrum / Re: This is annoying. I can't find videos for all of the uses of the Electrum. on: June 26, 2017, 02:57:37 PM
So how do people normally use those different options.
Standard HD Wallet = 90-95% of "normal" use cases... ie. people who want to send and receive bitcoin.

Standard nonHD Wallet = people who need to import private keys from paper wallets (or 'broken' software wallets *cough*MultiBit HD*cough*) and don't want to pay transaction fees to "sweep" the coins.

2FA Wallets = Paranoid people

Multi Sig = Groups of Paranoid People who don't trust each other

Watch addresses = People who use air-gapped offline computers to hold their private keys and sign transactions but need a way to see all the coins in certain addresses... (and/or nosey people who want to watch addresses for transaction activity)

LOL thanks for making us laugh!

multisig and 2fa are good for ordinary users too. It makes it much harder for malware to steal from you if you need to authenticate transactions via more than one device.
1544  Bitcoin / Electrum / Re: restoring wallet from seed (2.8.3) on: June 25, 2017, 01:49:38 PM
Move any previously created wallet files first. As I think what you're doing is making a wallet and then pressing file>new/restore. And the option will appear.

There is no need to move any wallet files. You can have more than one file on your file system!

and that's it? I can generate private keys off the seed alone?

Yeah electrum is a deterministic wallet. The seed leads to the master private key and child private keys are derived from that. It's a lot easier to backup than a wallet with unrelated private keys.

Almost all wallets are now deterministic. Even Core.
1545  Bitcoin / Electrum / Re: How to "sweep" private key in electrum? on: June 25, 2017, 01:23:11 PM
Those screenshots show creating a seeded HD wallet...
Then when it asks for the keystore, you want to select "Use public or private keys":

That's what I said.
1546  Bitcoin / Electrum / Re: How to "sweep" private key in electrum? on: June 24, 2017, 10:07:22 PM
so there is no way to import a new address (and his private key) in electrum?

Yes. Create a new wallet using file > new/restore and when the keystore screen comes up choose "Use public or private keys". Then enter your private keys in the next screen.

Here are some screenshots:

https://bitcoinelectrum.com/creating-an-electrum-wallet/
1547  Bitcoin / Electrum / Re: Bitcoin address 3XXXXX - Electrum can not "sign message" on: June 24, 2017, 10:02:48 PM
You need to create a standard wallet:

https://bitcoinelectrum.com/creating-an-electrum-wallet/
1548  Bitcoin / Electrum / Re: Can't send Bitcoin, because of old address? on: June 24, 2017, 01:38:42 PM
addresses have checksums in them. this means that invalid addresses will be identified as such by software like electrum.
1549  Bitcoin / Electrum / Re: sending from the same address using electrum on: June 24, 2017, 11:28:52 AM
I have a situation where in order to verify my account at btc-e, I must send another transaction using the same btc address. I am using the same wallet but when I make the deposit it shows it as coming from a different address.  I am using electrum 2.7.9 that comes built into tails.  I need to be able to send from that same address.  I have not done anything other than make a few transactions but it seems even though I am using the same wallet, same keys, etc... It will make a new sending address each time.  Is there a way I can reuse an address that has previously made a payment?  Thanks.

find the address under the addresses tab like pooya said in post #2. then send bitcoin to that address. you can send from your own wallet with a normal send transaction. next right click on the address and select spend from. this will allow you to deposit money to btc-e using that address.
1550  Bitcoin / Electrum / Re: Cant import private key. on: June 24, 2017, 11:26:18 AM
you can restore from your blockchain.info seed. you don't have to muck about with private keys. during the restoration process when you are asked to enter the seed make sure to click on options and check bip39

you can begin the process with file > new/restore.
1551  Bitcoin / Electrum / Re: Litecoin offline sign fail on: June 24, 2017, 11:24:15 AM
this forum is not for electrum ltc.
1552  Bitcoin / Electrum / Re: Is Electrum a safe wallet to keep bitcoins? on: June 21, 2017, 06:17:24 PM
I just wanted to know what will happen if we all find it impossible for transaction to take place with Electrum, we could see the coins in Electrum but unable to send (or even receive) with Electrum.  I am New and so this may be a stupid question.

Electrum has no control over what other people do with their money so it can never stop you from receiving bitcoins. If you ever find yourself unable to spend your money then you can ask for help here or try and figure it out yourself (usually upgrading to the latest version fixes bugs). If nothing works then you will have to recreate the individual private keys from your seed and use another bitcoin client to spend your money. That is explained in the last paragraph of my answer above.
1553  Bitcoin / Electrum / Re: Unconfirmed payment for the last few hours on: June 21, 2017, 06:11:23 PM
you can bump the fee for your transaction retroactively:

https://bitcointalk.org/index.php?topic=1916963.msg19015496#msg19015496
1554  Bitcoin / Electrum / Re: Is it possible to make Electrum automatically sign a transaction from a file? on: June 21, 2017, 10:47:04 AM
Maybe using something like a python script? The reason I want this is I'm making an offline wallet on a raspberry pi and it would be great if all I needed to do was plug in a USB stick with the .txn file on it and wait for it to sign, then I wouldn't need to have it plugged into a monitor and mouse & keyboard.

Thanks

you can run electrum from the command line so you can ssh into your pi and access electrum that way.

type `electrum help` at the console to see the command line options
1555  Bitcoin / Electrum / Re: Is Electrum a safe wallet to keep bitcoins? on: June 21, 2017, 10:42:39 AM
Another question:  What will happen if Electrum just disappears (software stops functioning or Electrum people just stops the project), can I still use my coins saved in Electrum with private key and addresses?

Stop mucking about with individual private keys. The seed is all.

Electrum is software. How do you imagine it will disappear? It is hosted on github. It is installed on countless computers around the world. All that will disappear?

If it all disappears then you still need a record of the algorithm they use to convert seed mnemonic into master private key. That algorithm is the same as the one for bip39 AFAIK. bip39 is also hosted on github and is found in countless other wallet software. I guess that could all disappear too in whatever world ending event causes electrum to vanish.
1556  Bitcoin / Electrum / Re: Can i backup multi-sig? on: June 20, 2017, 03:17:37 PM
Can I confirm: if I create a 2 of 3 multi-sig paper storage wallet, do I need the Master Public Key of all three accounts to access the funds again? Or can I do it with just 2 of the 3 seeds?

For each cosigner you need either the seed or the MPK. So 1 seed + 2MPKs, or 2 seeds +1mpk, 3seeds+0mpks, or 0 seeds +3 mpks. To sign a transaction you will need at least 2 seeds in that wallet or you will need to carry the unsigned tx to a wallet that has the necessary number of seeds. You can't sign with the MPK but you need it to reconstruct the wallet.

1557  Bitcoin / Electrum / Re: Conversion of Master public keys formats on: June 20, 2017, 10:52:53 AM
Hi.

Is there a way to generate a xpub... Master public key from an old style Master public key in hex format (wallet file from 2014)?

Regards,
Janus


I don't believe it is possible because the algorithm for the old style MPKs was totally different. What you can do is send all your bitcoins to a new format wallet and use the MPK of that. You can create a new wallet using file menu > new/restore and open wallet files using file > open.

The advantages of a new format wallet are:

- compressed public keys which take up less space on the blockchain so you save on transaction fees
- bip32 standard
- checksum in the seed mnemonic prevents typos
1558  Bitcoin / Electrum / Re: Electrum 2.8.3 crashes immediately after entering pwd on Windows 10 on: June 19, 2017, 08:57:18 AM
There is no need to reinstall. Just delete everything in the electrum data directory save for your wallets (which are in the wallets sub-dir):

http://docs.electrum.org/en/latest/faq.html#where-is-my-wallet-file-located

The electrum data directory is one level up from the wallets sub directory.
1559  Bitcoin / Electrum / Re: Trouble importing private keys to Electrum 2.8.3: on: June 18, 2017, 04:03:09 AM
The private key needs to be in wallet import format:

https://en.bitcoin.it/wiki/Private_key#Base58_Wallet_Import_format
1560  Bitcoin / Electrum / Re: No data in balance on: June 18, 2017, 04:01:40 AM
To upgrade electrum you just install the latest version. There is no need to uninstall the old version first.
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