I want to set up my wallet so nothing can leave without my google authentication. I already set my wallet up and has coin in it. I know you can do it during set up but I must have missed it. Where can i do it while the wallet is already in existence?
My second question. Is it preferable, every time i receive Bitcoin to send it to a different available address? or is that not best practice?
Still new to the game so want to secure as much as possible.
Thanks!
You need to create a new wallet if you want to use two-factor authentication with Electrum: http://docs.electrum.org/en/latest/2fa.htmlYou don't necessarily have to send Bitcoin to a different address in your wallet, Electrum does that by default but you incur larger fees and should probably disable it. Tools -> Preferences -> Uncheck use change addresses. You don't incur larger fees if you use change addresses. Inputs always have to signed individually. |
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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: abdussamad@linux:~/temp/electrum> electrum createmultisig 2 '["04351dfbaccad6c4c49db52062b711ec79b3cb364b490d9477cb3f4f66ac923c3faac1c0bfcd6edbd58c5b69ee8376fc4f9a935243602b451e92ce8ade093b9c74","04dec12260ff33763e4f52885fe05b8d7ed3017a286bf108b9ebe9cceae495525768b24a0d6519d602581bf2e12982b30b2f14405e504c3bd20b67deecc02ae3dc"]'
{
"address": "3KbGQXxWrScoMdZBnb21ZJ8UrKZbQhCFMu",
"redeemScript": "524104351dfbaccad6c4c49db52062b711ec79b3cb364b490d9477cb3f4f66ac923c3faac1c0bfcd6edbd58c5b69ee8376fc4f9a935243602b451e92ce8ade093b9c744104dec12260ff33763e4f52885fe05b8d7ed3017a286bf108b9ebe9cceae495525768b24a0d6519d602581bf2e12982b30b2f14405e504c3bd20b67deecc02ae3dc52ae"
}
Type `electrum help createmultisig` in a terminal to get more details. |
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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! |
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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. |
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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. |
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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. |
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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/ |
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addresses have checksums in them. this means that invalid addresses will be identified as such by software like electrum.
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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. |
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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.
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this forum is not for electrum ltc.
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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. |
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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 |
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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. |
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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. |
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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 |
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