just go to the receive tab and you'll get an address there.
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then you need to switch servers in electrum so that it can get the right picture of your transactions. i have no idea how this is done in the mobile version of electrum but i'm sure someone here will tell you or you could have a look around in the electrum interface yourself?
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if you can find the wallets then you can open them one by one in electrum and send the bitcoins to a wallet you do want to keep. you could even script this with the electrum command line. i don't think the other ways are practical.
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Hello I know that bitcoin-qt doesn't like when you shutdown the machine with the wallet running, i did it once and pay the price hehe This machine has a SSD Samsung 840 PRO 250GB which is a pretty good ssd drive!, very reliable. also this machine is connected to a APC SMART 2200XLI with extended battery, so even in a power outage scenario i have hours of operation, and even then, i have a generator (honda inverter, very clean output) hehe (yeah power utility in this country is a joke, you need to have all this crap to be able to work!) are you indian? anyway if it's not the ssd then it could be ram. run mem test for a couple of hours.
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.. and all these mining companies used to making millions off mining, what is going to compel them to keep mining when there rewards are like 1/100000 of what they were before..?
Man these arguments were made before the recent halving and no doubt before previous halvings. They will be rolled out again before the next halving too. The answer to your question is that mining companies know full well when the halving is going to happen and they make their plans accordingly. There was no huge drop in hash rate after the recent halving like some had predicted. The only dramatic event that took place was that the price doubled. So even though they are making less btc they are making more dollars. And no bitcoin hasn't jumped that much over the past 7 years, meaning when everything is said and done, whats to keep the hash rate so high to protect the network?
It's gone from cents to the btc to hundreds of dollars to the btc. How can you say it hasn't appreciated in value?
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exchanges probably use custom implementations. back in the day we learned that one of the reasons mt. gox lost so many bitcoins is because their custom implementation didn't keep up with patches to the satoshi client. I don't think the need for a custom version has changed so i think exchanges are still probably using a custom implementation because otherwise they couldn't keep up with the load.
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if the QR code is not too blurred then scanning that might be a better idea than trying to brute force the priv key. QR codes have built-in redundancies and error correction so even a slightly damaged QR code can yield a lot, if not all, of the data.
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However, this would mean it should scan the entire blockchain, won't that take for ages?
The answer to your question is bloom filters. It's supposed to be a way to request transaction data from full nodes without revealing your addresses. Unfortunately the theory doesn't hold out in practice and it does leak out info about your addresses: http://bitcoin.stackexchange.com/a/40949Further more, if I'm a heavy bitcoin user and already generated more then 10.000 addresses, then it should scan all of them? And how does it know I 'only' have 10.000 addresses? It could well be 100.000. At a given point I would probably notice that it's still incomplete as my balance is not matching, but suppose I totally forgot how much bitcoins I had. Any light shed on this would be appreciated :-)
Deterministic wallets employ a concept called a gap limit or "lookahead". Think of the gap limit as the number of unused addresses (as in no transactions on the blockchain) from the index of the last used address that the wallet keeps watching. So for example in electrum the gap limit is 20. Other wallets have more or less. If you have a large block of unused addresses and that block is larger than your gap limit then it's quite possible that multibit won't look for transactions there. Then you have to manually instruct multibit to increase its gap limit. You can do this in electrum so I'm sure there is a way to tell multibit to do the same. Couldn't it use the blockchain offline?
What you can do is have a split setup where you have an offline wallet with the secret seed and an online wallet that only contains the public keys i.e. a watch-only wallet. You create transactions on the online wallet, sneakernet it to the offline wallet for signing and then back to the online wallet to broadcast it. Armory and electrum support this sort of "cold storage" setup.
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I can think of a few things that could cause this:
- Last I tried bitcoin core you had to manually shut it down before you shut down the computer i.e. it would not automatically shut down with the OS. If you didn't do this there would be DB corruption - Like achow101 said DB corruption can be a sign of a hardware problem. In my experience it can be a sign of a failing hard drive.
If I was you I'd definitely make sure bitcoin core was shutting down correctly when you shut down your OS. If you live in an area with power cuts you have to get a UPS or this DB corruption will keep happening.
As for the second point you can run chkdsk to check your hard drive for bad sectors.
BTW electrum is one of the most widely used wallets. You shouldn't be afraid to use it.
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Hello,
I've emptied my Electrum wallet to another cold wallet temporarily (currently a "zero" balance)... I have 3+ years of transactions in the ledger, and was wondering if there is a way to clear it out (more/less just to tidy up the look)... is it possible? Thanks!
creating a new wallet and sending bitcoins there would be the simplest way. it would mean that your addresses would change. you can create a new wallet using file > new/restore.
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And under the receive tab, since my transaction is still pending, will I loose all my money in 23 hours when the request expires?
requests don't expire btw. that part of the interface needs some rewording. suffice it to the address you got from the receive tab will continue to work forever and you should have no problems receiving money to it now and in future. as for the confirmations issue don't worry either the two transactions will confirm or they won't. you won't lose money. just wait it out.
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For a given HD wallets public xpub (Extended public key), derive the public child addresses, in bulk. This PHP script : https://github.com/dan-da/hd-wallet-addrs , derives public addresses, but does so one by one, which is sloww. I am pretty sure it is possible to derive say 10 to 100 child addresses at one go. But how ? I believe the library that bitcoin payments for woocommerce uses is faster than the bitwasp ones. I use it for my bitcoin address plugin too. You can grab it from either plugin. In my plugin you'll find it in includes/libs. The ElectrumHelper file contains the static function mpk_to_bc_address that you can use. The downside is that this is only for electrum. You'll have to modify it to use another address derivation.
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Or, OP might be able to remember a word or two from the seed which will greatly help in brute-forcing.
you need a lot more than a word or two to brute force the seed. there are way too many possibilities.
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;)hello guys, Abdussamad: ... when I go on "the seed button", electrum asks me the password. Coding: it is right, the only thing I can do is a "brut force ". how? can you help me? witch preogramm do I have to use?
brute forcing only works if you have *some* idea what the password is. otherwise it's a crapshoot.
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In the case of p2sh addresses the address is a hash of a script not the hash of a public key. So what are you trying to achieve again?
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I installed electrum , it has not asked me for the password it has not shown me the seed. I think that, this has happened because probably the electum wallet during the new installation has recovered data from an old installation. Unfortunately I have not been paying attention to this, the wallet was activated immediately and i send bitcoin to it from a bitcoin core wallet. ,...... Now my bitcoin are in the electrum wallet installed on my PC and I do not have the password and seed. how can I recover the bitcoins? People say that, those bitcoin are lost but I can't belive it !! ....they are in my wallet installed in my pc....... Can you help me please !!
Go to wallet menu > seed. Tell us what happens when you do this.
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I think we missed an opportunity here to get some debug data and maybe file a bug report. I guess next time then..
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When this happened in the past we would tell people to delete the files "blockchain_header" and "config" from the electrum data directory. The electrum data directory is one level up from the wallet directory which is located at: http://docs.electrum.org/en/latest/faq.html#where-is-my-wallet-file-locatedSo try the above and if it works please do post here so we know this still works!
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Ok but has anyone tested it except the main dev, how many people are testing the software for bugs and errors? Every single user. However, most don't report bugs (this is the case with all software). The ones that do help improve the software because they bring those bugs to the devs' attention and then they can fix it. One difference between 2.7 and older versions when it comes to seeds is that in 2.7 they have standardized seed mnemonics to 12 words for all wallet types. In 2.6 it was 13 words for normal wallets and more words for other wallet types. That doesn't make the 2.6.x seeds any more or less safe though. The other difference is that the wallet file format changed in 2.7.x. So when you install 2.7.x it upgrades your wallets to the new file format. So old wallets can be used in 2.7.x but newer ones can't be used in 2.6.x. So you can continue to create wallets in 2.6.x if you prefer but I don't recommend it. I suggest creating new wallets using 2.7.x. The release of lots of point versions in the 2.7.x line should not be taken as a bad thing. If anything it shows that the developers' are actively fixing bugs and improving the software and right now at .11 it's pretty mature.
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