And I understand that I wouldn't choose them truly randomly unless I entered a electrum of made up words into a generator and rolled a bunch of times. This command will generate one new address. Your email address address not be published. Hand-copy the twelve words found in the box to a piece of paper and store it in a safe location. You can length roughly the same process as above to send transactions with such a wallet, electrum removing the seed instead of the bitcoin key when copying the wallet over to the online machine. The position of the words in the wordlist matters! A Bitcoin addressor simply bitcoinis an identifier of alphanumeric characters, address with the number 1 or 3that represents a length destination for a bitcoin payment.
The transaction was sent with a low fee and will take a long time to confirm or may never confirm. There are three major clients that allow you to do this: Where is my wallet file located? How can I tell what my wallet type is and what my wallet file name is? Terminal is a tool for entering low level commands. If I generate too many, they go red for some reason. Join them; it only takes a minute:
I only said that the sha hash of my wallpaper bitcoin high entropy. To receive money to your wallet you can electrum to the receive tab address grab a bitcoin address from there. This is an archived post. Notice how little you really need to memorize to have a brain wallet length this method: Click the Preview button.
I don't even see how 13 words are enough to encode a 32 digit hex number. If you get a different result, use the exact intermediate result.
The English language has 1'' words which would be enough but that's counting words like "pneumonoultramicroscopicsilicovolcanoconiosis". Electrum only uses very basic English words of which there aren't nearly as many as ' How does Electrum even create several addresses from a single 32 digit hex number?
The wallet import format this website generates if I enter the hash of my wallpaper doesn't match any of the private keys in the Electrum wallet. I'd expect the first private key to be the one generated from the 32 digit hex number I entered and all others to be generated using a deterministic key derivation algorithm. The word mnemonic is just a way to encode a bit number into something human-readable and memorable.
The 13th word is a checksum, and 12 words would suffice to recover the number encoded. You should always generate it by truly random means to reduce likelihood of someone generating the same as you and running away with your coins. Some more info can be found here. The wordlist consists of words since circa Aug If you want to know how many words you need to encode a bit number, you can calculate yourself. I tried to replicate what you did, and used electrum wallet recovery function.
When inputting a 32 digit hex number, I get a 12 words mnemonic. It would also accept a 64 digit base16 number, and then I'd get a 24 words mnemonic, which makes sense considering how it's generated.
However, I'm having trouble replicating what you experienced, to get a 24 word mnemonic from a 32 digit base16 number. Now, what is that number used for? It's used to generate your master private key, master public key and all the keypairs in your wallet. It's nicely detailed here.
Therefore, master keys are not generated directly, but instead from a potentially short seed value. So you're thinking about the word-encoding incorrectly. The first thing you have to do is lob off that 13th word, as it is used as a checksum, so there are actually only 12 words.
Now there are lots of options for Electrum to take to derive its master key, and there are two that are of particular interest. The simplest way is just to hash the actual words, so sha seed phrase goes here. The advantage of this is that future wallets don't need to store old word lists if the word list changes, they can just hash the words that have been entered, check it against the checksum there are ways of encoding the checksum that also don't require keeping the wordlist , and then if it passes restore that wallet.
The way that Electrum used to do the derivation, that is still used by Monero and others, is by having a wordlist with a fixed length of words. The position of the words in the wordlist matters! This number is just a bit larger than bits: As to how Electrum creates several addresses from a bit number or a bit number in the case of hashing the seed words , the seed derivation works by increasing a "nonce" and deriving an address from that.
So, by example, if we pretend that we have is our seed, then we could increase that seed by 1 for each address derivation. If we use a simple sha hash of that as our private key, then we get the following addresses:. This is obviously oversimplified, and not the derivation that is used in most BIP32 implementations or in Electrum. Cryptography works because the same hash can always be derived from a given input, but the input can not be derived from the hash.
To the human eye, they all look like a nice long hard to guess password, so you might be tempted to use any of those as a seed for electrum but that would be a really bad idea and almost certainly lead to the loss of your bitcoin. The true randomness and the amount of entropy generated are the important factors in securing your wallet. Brainwallet is as secure as electrum when you generate those words randomly.
Never pick your own password. Electrum's website is not served over SSL. Their downloads page shows version 1. Speaking 5 languages, I feel that I can increase the randomness by using words from other languages.
Would this be true? Why you cannot enter an arbitrary seed in Electrum https: I would suggest you not do this because the electrum seed is totally random. Any words you choose might not be. Also, the seed isn't really a series of word at all, but a random bit number that is converted to words so that it can be memorized or easily written down.
But you need to keep a printed copy somewhere safe. Human memory is not reliable. The intention is that the Bitcoin community moves away from individual private keys which are too hard for the average person to manage safely. Is the algorithm for converting an Electrum mnemonic into private keys and addresses known? I realize it is open source. I guess I'm just looking for an understanding or explanation of the conversion algorithm without needing to delve too deeply into the source code.
Can you please explain me one thing about private key and adresses? For instance I got adress locked to my pool and transfering money to it from time to time, now I want to completely move from Bitcoin-QT to Electrum, so what should I do?
I recommend Armory if you don't mind loading the blockchain. It has very good security features and it's even more safe than electrum. But it is slower and eats more RAM, so it might not scale as well which leads to sloppy users who takes risks. Electrum is already pretty damn slow Mind you, I run electrum on a Raspberry Pi, but it literally takes an hour for it to create and sign a 2kb transaction.
Just about every wallet out there has a downside. Limited hard disk space? Stay the hell away from Electrum. Need to create a one-to-many transaction? There goes any chance of using a web-based wallet: I'm excited for all the improvements that are planned for the reference client to reduce disk space and network bandwidth and speed up initial blockchain download. It takes only about max 0. In the official page and many users' experience: We are aware of the usability issues and should have it resolved in the next few weeks.
Yesterday they mentioned on IRC 1. Just make sure that those 12 words appear nowhere together anywhere on the internet song lyrics, a quote, etc. There are bots that scan wallets using Wikipedia as a source and will empty yours if the words aren't truly random.
You can keep generating a new one. Have these brain keys been proven to be secure? That was only to counter the appearing somewhere else argument but it appears electrum does this automatically for you, according to Gibybo. I've never used electrum. I thought it was like a brain wallet where you choose the words.
Everyone can remember them unless you have serious memory problems, but it does take a bit of practice. Write them on some paper then start repeating them every day for a solid week. When you're confident about them, burn the paper you wrote them on and then transfer your bit coins on the wallet. Build a story with them. You can have it solidly in your brain in a day or two that way. This is a very well known mnemonic technique. I use 8 words for my computer password, GPG key, and Gmail; I use each of them on a daily basis and never have any problem remembering them.
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Want to add to the discussion? If you would like to validate a Bitcoin address in an application, it is advisable to use a method from this thread rather than to just check for string length, allowed characters, or that the address starts with a 1 or 3. Validation may also be done using open source code available in various languages or with an online validating tool.
Addresses can be created that require a combination of multiple private keys. Since these take advantage of newer features, they begin with the newer prefix of 3 instead of the older 1.
These can be thought of as the equivalent of writing a check to two parties - "pay to the order of somebody AND somebody else" - where both parties must endorse the check in order to receive the funds. The actual requirement number of private keys needed, their corresponding public keys, etc. Most Bitcoin addresses are 34 characters. They consist of random digits and uppercase and lowercase letters, with the exception that the uppercase letter "O", uppercase letter "I", lowercase letter "l", and the number "0" are never used to prevent visual ambiguity.
Some Bitcoin addresses can be shorter than 34 characters as few as 26 and still be valid. A significant percentage of Bitcoin addresses are only 33 characters, and some addresses may be even shorter.
Every Bitcoin address stands for a number. These shorter addresses are valid simply because they stand for numbers that happen to start with zeroes, and when the zeroes are omitted, the encoded address gets shorter.
Several of the characters inside a Bitcoin address are used as a checksum so that typographical errors can be automatically found and rejected. The checksum also allows Bitcoin software to confirm that a character or shorter address is in fact valid and isn't simply an address with a missing character.
Addresses on the Bitcoin Testnet are generated with a different address version, which results in a different prefix. See List of address prefixes and Testnet for more details.
Addresses are not intended to be used more than once, and doing so has numerous problems associated. See the dedicated article on address reuse for more details. Addresses are not wallets nor accounts, and do not carry balances. They only receive funds, and you do not send "from" an address at any time.
28 Nov A popup window shows the amount sent, the transaction length in bytes, the fee and fee density you're paying, and source/destination addresses. Preview Transaction. The lines appearing under the Outputs section are noteworthy. Bitcoin is an electronic cash system in which digital coins are represented. There is no practical limit of how many addresses Electrum can generate from a seed. To figure out, how much money you have in your wallet, Electrum needs to sum up the funds in your addresses sequence – of which I just said that it doesn't have a practical limit in the number of its elements. This causes. where H is the number of bits, L is the length of our password (12, in the case of Electrum), and N is the total possible number of symbols ( in this case). Thus , H = log2() * 12 = , so bits of entropy in the Electrum seed. As to how Electrum creates several addresses from a bit.