hello Abdussamad I need some you suggestion I have one problem I start downloading of Bitcoin qt and and its working ok I give this address to one persona for my payment and he send now this address has 0.15 btc but bad luck my windows corrupt and now I am doing this download on other computer how I recover my old coins I have wallet.dat please must reply waiting for this
hello Abdussamad can you help me about this I am waiting for your reply Didn't get email notification. Ok so as long as you have the wallet.dat file you are ok. Just place a copy of that in the bitcoin data directory on your new PC i.e. the same place it was on the previous PC. If you are confused you can find the data directory location by referring to this page: https://en.bitcoin.it/wiki/Data_directoryPersonally I recommend switching to electrum. That way you won't have to worry about the massive blockchain download. |
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What kind of sorcery is this?? Your site is quite fast for browsing. Did you just start hosting a block explorer? |
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I get that my public address is simply the public part of a key pair.
No, a bitcoin address is a hash with checksum of your public key. It is not the public key itself. So each private key is a string which I sign with my wallet address to send from. Is that correct?
No. A private key is basically a really, really large number. You sign transactions using your private key not your address. What format is this .dat file?
leveldb I think. More info: https://en.bitcoin.it/wiki/WalletWhat is the length of each key? Is it fixed?
See more about private keys: https://en.bitcoin.it/wiki/Private_keyLike presumably you could hash the raw bytes of a favourite photo or something? Wildly insecure probably, but anyway, off-topic...
Yes it's possible. You do an sha256sum of any file to get a private key. There is more to it than that but it's possible. Search the forums for more info. There are a few scripts that people have shared that can generate private keys using a file as input. Until I encrypt the wallet using the function in bitcoin-qt - is the wallet essentially wide open for anyone with access to the file to read my private keys?
Yes. The wiki is probably the best place for technical details: https://en.bitcoin.it/wiki/Main_Page |
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I've read that in Electrum's version 2.0, the generated seed will change from the current 12 words long to a longer one. Will this conflict in any way with my ability to restore a 12-word seeded wallet? I intended to save multiple copies of the electrum version used to generate the cold wallet, to be able to restore the wallet independently of the project's future developments. But since electrum depends on the online servers it's not a fully stand-alone program, and I am a bit worried of what would happen in the case of divergent developments or in case the project gets abandoned.
Thanks!
You need the private keys of your bitcoin addresses to spend your coins. To get the private keys you need at the very least two things: 1. The seed 2. The algorithm to generate addresses and private keys from a seed. 1 you already have. 2 is out "there" on the Internet in many, many forms. For example electrum has its own github repo that has all versions of electrum since they started using github. It's just a matter of finding the right version. There are also a bunch of other projects that can generate private keys using an electrum seed. sx and vbuterin's pybitcointools come to mind. If you are really worried about 2 you can create your own backup of electrum. Just copy the download file onto a USB stick or DVD. Then you won't have to depend on anyone else. |
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Thanks but isn't there a way to precisely calculate it? I want the end balance to be precisely zero.
It is called a calculator: 2.01958333 - 0.0001 = 2.01948333 |
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Wow he found it quick!
Thanks, that's a relief.
This is bad advice. You said it yourself there are 50 characters and any one of them could be wrong. There is no way to bruteforce that. I seriously suggest you give up on paper wallets for now. The way you are going about it you will loose your coins because you made a mistake and not because somebody stole them from you. |
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I think Bitcoind is turning off due to inactivity, any way to prevent that from happening?
What do you mean with that? Window is closing immediately after run? Try to describe your problem more, because I don't know where to search solution  I run bitcoind -daemon on a server. It will turn off after a random period of time, normally. I check back a while later (like 12 hours or something), and its off. But if I turn in a cronjob, like just bitcoind getbalance or something, it doesn't seem to turn off ever. Been running like that fine for almost a week now. Just wondering if there's any way other than a cronjob, that seems like an odd solution. Which version are you using? bitcoind used to have a memory leak and when the system ran out of memory bitcoind would be shut down by the kernel. You can probably find messages pertaining to OOM problems in the log files. |
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You can/should double check if it's really yours on receive tab under 'change'
Yes double check before broadcasting the transaction. Remember there is no undo button in bitcoin! |
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I'm not sure I agree with this advice. You can encrypt and decrypt your private key using bitaddress.org right now. You can also save a copy of that site for offline use and in case it disappears in the future. So I really don't see why you need development skills to be able to do this.
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Brainwallets with human generated passphrases are a bad idea. Doesn't matter if it's offline or online they are just a bad idea period.
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master public key (MPK) creates a watch only wallet meaning you won't be able to spend the coins. You will need a working backup of the seeded wallet or a copy of the seed to be able to restore a full wallet.
Correct, that is the way I had it configured anyway. The primary reason I use Electrum is because of the watch only wallet and offline wallet concept. The lack of necessity to download the blockchain is a close second. Thanks for your reply though. Yeah definitely one of the best features of electrum. Glad everything is ok  |
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master public key (MPK) creates a watch only wallet meaning you won't be able to spend the coins. You will need a working backup of the seeded wallet or a copy of the seed to be able to restore a full wallet.
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Try it and let us know if that worked for you. Also, it's a good idea to avoid using your laptop if it's not updated. Thanks guys!! I'll try it out and let you know... bci is not safe. Don't use it for large amounts. |
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Yeah but you understand I'm not talking about missing one letter or number at the end right?. I'm talking about a 30ish numbers/letters private key, missing a number or letter anywhere in it, or maybe not missing, but the wrong number/letter somewhere in the private key. That is a shitload of combinations to guess by yourself lol.
But is there is some program to crack those type of things if you know almost all of it? Trying different things until it matches your public key? I hope it does so I would get the relief that even if I screwed up one element, I will be able to recover my private key, and at the same time my savings.
Just need a convincing answer about such programs before I transfer them into that wallet.
Thanks
No! Don't rely on brute forcing when just generating a new key pair will do. I don't know whether you realize this or not but you can run ubuntu straight from the DVD i.e. you don't have to install it on your hard drive. Maybe it would be better if you stopped this whole thing? You are liable to loose your coins because you made a mistake. |
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Labour-intensive means something that requires a lot of human workers. So I don't see how it can be used when talking about mining because that is all automated. Resource intensive might be a better fit. Maybe computationally intensive?
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Little confused
Why not tell people which exchange you are referring to?
And why should I feel bad when you apparently have 124 bitcoins, ~~ $120,000 in your wallet when you said .025 was all you had?
It's not his wallet. It's the site's wallet i.e. a shared wallet. Who knows who's bitcoins are in which address? |
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Mt. Gox is no longer the benchmark because they have banking problems and are no longer able to pay their customers on time. For USD bitstamp is the benchmark price now. I don't know about CAD.
If you are going to trade locally then people will keep significant margins. If you don't like that you can always risk it with an exchange.
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Is Bitcoin primarily a medium of exchange or a store of value? No financial instrument can be both things equally well. Despite what some Bitcoin proponents believe, specialization in one direction is inevitable (many people who seem to think it can somehow be both are the same ones advocating 'buy and hold forever'...).
I disagree with your premise. Bitcoin makes a fantastic medium of exchange (best in human history), and due to the predictability and certainty of mining new Bitcoins (at predetermined rates), and the lack of monetary inflation, it will also make a great store of value. Please explain why one cannot both save and spend in Bitcoin? Price is too volatile for it to be used as a medium of exchange. In my experience ordinary people only use bitcoin as a medium of exchange when they have no other alternative. For example because other payment systems are not as well developed in that part of the planet. Bitcoin's deflationary nature discourages spending and encourages saving making it more suitable as a store of value. So, yes, it can be used as both and some people will use it as both but it will primarily be used as a store of value. |
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Hobbes you should see this: On a related question, will seeds that are more than 12 words (and multiples of 3) always be supported? It came up in this thread where hobbes talks about concatenating 2 wallet seeds to create a 24 word seed: https://bitcointalk.org/index.php?topic=354261.0in version 2.0, the seed phrase will be hashed in order to generate the master public key. thus, any phrase length will be supported. However, in order to recognize seeds from version < 2, I plan to check if the number of words is 12. so it's probably not a good idea to create 24 words seeds now. |
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