Understanding Electrum | Bitcointalksearch.org

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legendary

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Quote from: margotcoins on April 17, 2019, 03:54:35 AM

Hi,

I downloaded Electrum, but somehow I still fail to understand how it works.

This is just a scenario for me to better understand, I am probably compromising security by doing some/all of these (I guess):

I see the wallet file default_wallet in the folder on my computer;

If my ssd fails/lose pc/whatever my wallet is gone; right?

But if before I lose pc I make a copy of said file (default_wallet) do I still have my wallet?

What if my friend send me some coins AFTER my ssd failed and I only have the copied file, where do those money go? Into wallet? Into a lost never to be accessible again wallet? into nothing???

Many thanks!

Electrum HD wallet. Thats mean If you remember seed code (12 words), no matter have or not default_wallet.

To see for yourself that you can recover a wallet from a seed phrase, create a wallet, write down the addresses of the purses (start with "3" or bc, depending on the type of wallet). Then delete the fact and try to restore by a sid phrase. Your wallet addresses must be restored. Now you may send bitcoins to addresses. If you fear to use bitcoins, may begin from cheaper coins, dogecoin perfect alternative.

r_victory

sr. member

Activity: 1955

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Quote from: ?? on ??

I opted for electrum for both BTC, LTC and STRAT. I use only to receive, would like to know, how can I know if I am paying the correct fee? Is it possible to adjust automatically? There's some place I can research this? I really tried, but I could not find it specifically, thank you in advance for the help.

I would recommend you looking at this website before sending a transaction. In the Electrum settings, you can change the fee estimation method. I always set it to Mempool since it's more accurate and helps to overpay less. RBF should be enabled by default if you are using the latest version. It's useful when the fee was too low.

Many thanks for the link, where do I get a similar one but to calculate the LTC fee? Some site that has other coins also, will be very welcome...

margotcoins

jr. member

Activity: 57

Merit: 18

Quote from: HCP on April 21, 2019, 02:53:44 PM

Quote from: margotcoins on April 21, 2019, 12:15:35 PM

it does say 2fa up on top but I also seem to remember that I selected standard wallet in the process creation, is this even possible?

No, it isn't... The options are:
- standard wallet
- wallet with 2FA
- multi Sig
- import private keys/addresses

Refer:

You will need to make sure that you have the seed safely backed up in case of 2FA device loss... It's the only way you'll be able to recover if your 2FA app does not support backups.

As Lucius mentioned, there are costs involved with sending from a 2fa wallet... Read here: https://api.trustedcoin.com/#/electrum-help

I totally forgot about that screen with all the options but I must have also forgotten about selecting 2 factors, I guess I 'll start over, and now I understand what those fees are I couldn't really make out. Many thanks!

pooya87

legendary

Activity: 3472

Merit: 10611

Quote from: r_victory on April 21, 2019, 04:30:38 PM

Quote from: ?? on ??

I opted for electrum for both BTC, LTC and STRAT. I use only to receive, would like to know, how can I know if I am paying the correct fee? Is it possible to adjust automatically? There's some place I can research this? I really tried, but I could not find it specifically, thank you in advance for the help.

I would recommend you looking at this website before sending a transaction. In the Electrum settings, you can change the fee estimation method. I always set it to Mempool since it's more accurate and helps to overpay less. RBF should be enabled by default if you are using the latest version. It's useful when the fee was too low.

Many thanks for the link, where do I get a similar one but to calculate the LTC fee? Some site that has other coins also, will be very welcome...

you don't need to use a website to get how much fees you should pay even for bitcoin. your Electrum wallet does a good job at giving you the best estimation for how much fees you should pay and has the option (in preference) to show you a fee slider and a textbox which you can manually change the fee/byte value and set it based on the size of mempool.

HCP

legendary

Activity: 2086

Merit: 4361

To be honest, none of the other coin networks really have issues with full blocks or fee "spikes"... aside from say ETH.

Having said that you can see the current mempool stats (pending transactions + associated fees) for BTC, BCH, BSV, LTC and Dash here: https://jochen-hoenicke.de/queue

To see the breakdowns of the fees being used, hover the mouse over a given point in the graph... Right hand edge of the graph is most current values.

HCP

legendary

Activity: 2086

Merit: 4361

Quote from: margotcoins on April 21, 2019, 12:15:35 PM

it does say 2fa up on top but I also seem to remember that I selected standard wallet in the process creation, is this even possible?

No, it isn't... The options are:
- standard wallet
- wallet with 2FA
- multi Sig
- import private keys/addresses

Refer:

You will need to make sure that you have the seed safely backed up in case of 2FA device loss... It's the only way you'll be able to recover if your 2FA app does not support backups.

As Lucius mentioned, there are costs involved with sending from a 2fa wallet... Read here: https://api.trustedcoin.com/#/electrum-help

margotcoins

jr. member

Activity: 57

Merit: 18

it does say 2fa up on top but I also seem to remember that I selected standard wallet in the process creation, is this even possible?

HCP

legendary

Activity: 2086

Merit: 4361

Quote from: margotcoins on April 21, 2019, 03:23:37 AM

my "seed" option is greyed out for some reason ..

It's either a 2FA wallet (and will say [2fa] in the title bar next to the wallet name), or you have used an imported BIP39 seed that was generated by a wallet other than Electrum when you first created the wallet.

Either of these scenarios results in Electrum generating a wallet file that does not store the 12 word seed (so the option is greyed out in the menu).

Lucius

legendary

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Quote from: margotcoins on April 21, 2019, 03:23:37 AM

my "seed" option is greyed out for some reason...

The reason is that you've probably made 2FA wallet, and in this case you can not see your seed (check the accuracy of words). 2FA wallet is for extra security, but in case of Electrum is not free, and it can be very problematic to restore wallet if you lost your phone and seed.

In process of wallet creation pay pay attention to all steps, and the simplest option is to select Standard wallet.

margotcoins

jr. member

Activity: 57

Merit: 18

my "seed" option is greyed out for some reason .. I have the wallet open after the password, and that's the only option that's not available. Anyway don't worry about it too much, I made so many mistakes in creating this wallet that I'll have to start over as soon as I need a secure one. Thanks again!

HCP

legendary

Activity: 2086

Merit: 4361

Quote from: margotcoins on April 17, 2019, 02:05:34 PM

My next dilemma would be about those mnemonic codes. I have three of them I am not sure what they belong to. One of them is for sure my Electrum wallet, the other two I have no idea, probably just from online wallets/exchanges I created in the last few days. They are empty for sure but they must belong to some websites.

Is there perhaps a way to tell my electrum wallet to regenerate those 12 words so I can match them to my list and see which one is which?

To answer this specific question... Yes, you can tell which one is the Electrum one.

Open Electrum and use the "Wallet -> Seed" menu option. If you have a password set, you'll be prompted to enter it... Then your 12 word seed mnemonic will be shown to you.

That way you can be confident that you have the correct 12 words safely written down!

margotcoins

jr. member

Activity: 57

Merit: 18

I am starting to see the whole picture now, it's as beautiful as fascinating design, I guess I have been bitten by the coin bug now!

pooya87

legendary

Activity: 3472

Merit: 10611

Quote from: margotcoins on April 18, 2019, 05:13:11 AM

~
I am still confused about cold wallets though, how can you operate a wallet if always offline, I mean you can receive funds (also not sure how you can check for balance) but how is it possible to send coins if the machine will never be connected to the internet?
~

maybe a quick summary of how bitcoin works can help you understand it better.
in bitcoin, you don't "store" bitcoin! instead you store the "keys", and your "coins" are the transactions that are stored on the blockchain and all the full nodes have a copy of it. to spend, you only "prove ownership" by creating a signature with some complicated cryptographic method.
that is why cold storage works, because it simply is a storage of keys.

as for spending you just have to be online (one a different device) to be able to look at the blockchain (since it contains your "coins") and get the transaction IDs and create a transaction. then transfer this to your cold storage where your keys were and sign it. then go back online and send it to the network so that the nodes know about it.

margotcoins

jr. member

Activity: 57

Merit: 18

thank you so much that's a great video that tells it all!

I guess I'll have to watch it more than a couple of times to learn the practice to the letter and put it in place, thanks again for all the support, you guys are awesome!

TryNinja

legendary

Activity: 2758

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Quote from: margotcoins on April 18, 2019, 05:13:11 AM

a lot of great information to process thank you!!! I have a lot to digest ...

I am still confused about cold wallets though, how can you operate a wallet if always offline, I mean you can receive funds (also not sure how you can check for balance)

By checking the balance on a connected device (either with a view-only copy of the wallet or by checking the address in a block explorer).

Quote

but how is it possible to send coins if the machine will never be connected to the internet?

Craft the raw tx in a connected device (where you can see the inputs), send them to the offline cold-device through a flash drive, sign it with the private-keys, send it back to the online device and broadcast it.

This video shows it well: https://youtu.be/DQumISxkJsQ

margotcoins

jr. member

Activity: 57

Merit: 18

a lot of great information to process thank you!!! I have a lot to digest ...

I am still confused about cold wallets though, how can you operate a wallet if always offline, I mean you can receive funds (also not sure how you can check for balance) but how is it possible to send coins if the machine will never be connected to the internet?

Thanks!

Quote from: pooya87 on April 17, 2019, 09:34:01 PM

if you want true cold storage security then you have to start a new set up in a clean and offline computer (that has never been and never will be connected to the internet)

Lucius

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Quote from: margotcoins on April 17, 2019, 02:05:34 PM

Dumb question: what is going to stop scammers to generate random mnemonic words and accessing random wallets around the world? I mean are there really so few wallets? I don't think so .. I am thinking down the line guessing or generating 12 words in row and accessing some other people coins must not really be that against the odds of probability, also statistic is not really in our favor since all the words have full meaning and there must be a lot of wallets out there! What am I missing?

When someone thinks in the way you think then it is quite logical to presume that 12 words are not enough to protect your wallet, just because anyone can use Electrum seed list and try somehow to guess your seed. But the thing is a lot more complicated than that, it is not only about 12 words seed from 2048 word list, it is also about 5 different languages. If you look at the next post some things will be much clearer.

Quote from: DannyHamilton on September 21, 2016, 09:05:45 AM

As some in this thread have been trying to explain to you, most alphabets have a LOT less than 2048 letters.

Humans seem to have a very difficult time wrapping their minds around big numbers. I'll try to put it in perspective for you as best I can.

Lets try some simple math:

The english alphabet has 26 letters. That means that you have 26 possibilities for the first character. Each of those 26 possible first characters can match up with another 26 possibilities for the second character, so that's 26 X 26 possibilities for 2 characters. We can keep doing this for however many characters there are in the "seed":

26 X 26 X 26 X 26 X 26 X 26 X 26 X 26 X 26 X 26 X 26 X 26 = 26¹² = 9.54 X 10¹⁶

That's just a little bit less than 10,000,000,000,000,000 total possibilities for a 12 character seed from a 26 character alphabet. If you could try 10 billion passwords per second, it would take you about 11.5 DAYS to try all possibilities. This is why a 12 character seed doesn't "feel" very secure to you.

Now lets try the same with a 2048 character alphabet...

2048 X 2048 X 2048 X 2048 X 2048 X 2048 X 2048 X 2048 X 2048 X 2048 X 2048 X 2048 = 5.44 X 10³⁹
That's a bit more than 5,000,000,000,000,000,000,000,000,000,000,000,000,000 total possibilities for a 12 character seed from a 2048 character alphabet. If you could try 10 billion passwords per second, it would take you more than 1.7 X 10²² YEARS to try all possibilities.

That's significantly longer than the earth has existed. If you worked for the entire time that the earth has existed so far, and then again, and then again, and so on... You'd have to repeat that entire time more than 3.7 X 10¹² times.

1.7 X 10²² YEARS is significantly longer than the universe has existed. If you worked for the entire time that the universe has existed, and then again, and then again, and so on... You'd have to repeat that entire time more than 1,000,000,000,000 times!

https://bitcointalksearch.org/topic/how-can-electrum-seed-be-secure-1623339

nc50lc

legendary

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Self-proclaimed Genius

Quote from: margotcoins on April 17, 2019, 02:05:34 PM

Is there perhaps a way to tell my electrum wallet to regenerate those 12 words so I can match them to my list and see which one is which?

Electrum will reject the mnemonic SEED by default if it wasn't generated by it, the "next" button will be grayed out.
So to find out which is the correct one, simply restore via SEED (Create wallet->I already have a SEED).

By all means, make sure that you have a physical written copy other than offline backup to make sure that it's safe from data loss.

pooya87

legendary

Activity: 3472

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Quote from: margotcoins on April 17, 2019, 02:05:34 PM

I did have my 12 words stored on a cloud so I moved it offline right away.

technically anything that has been online is considered compromised. transferring it offline doesn't change anything. if you want true cold storage security then you have to start a new set up in a clean and offline computer (that has never been and never will be connected to the internet) and create a new wallet (with new seed) and then send your coins there by making a transaction.

Quote

Dumb question: what is going to stop scammers to generate random mnemonic words and accessing random wallets around the world? I mean are there really so few wallets? I don't think so .. I am thinking down the line guessing or generating 12 words in row and accessing some other people coins must not really be that against the odds of probability, also statistic is not really in our favor since all the words have full meaning and there must be a lot of wallets out there! What am I missing?

it is the same dilemma as private keys! there is nothing stopping anybody from creating random keys/seeds but what protects your seed/private key is that the possible range of numbers to choose from is so huge that even if you continue guessing millions of them per second you still wouldn't be able to finish in a million years.

moha sasa

jr. member

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Quote from: margotcoins on April 17, 2019, 03:54:35 AM

Hi,
I downloaded Electrum, but somehow I still fail to understand how it works.

- You should do yourself a favor and read how it works:-

https://buildmedia.readthedocs.org/media/pdf/electrum/latest/electrum.pdf

Topic: Understanding Electrum (Read 387 times)