Check Bitcoin Wallet Address Balance - Online Tool BitRef

Help me to retrieve my lost bitcoins.

Hello, i were using multibit hd and Breadwallet together. I used both of them with 1 wallet opened on both. Suddenly my pc broke and i tried to restore my wallet on new pc. When i restored one btc address with money on it was missing. i tried to generate private addresses from BIP39 mnemonic but i couldnt find that recieving addres in the list of 50000 address. Money is still unspent. Help me to get it back i know wallet words and everything. If someone helps me i will gift him/her a bunch of a beer on btc address :)
submitted by Helpmenowbtc to Bitcoin [link] [comments]

Just lost ~0.8 bitcoin using multibit, and don't understand why. Please help!

i'm running the latest client and had a balance of 2 BTC when i logged in about an hour ago. after opening multibit and letting it sync, i sent 0.2 BTC to one address and my balance went from 2 to 1.8 BTC, with a "spendable balance" of 1.3 BTC. the 0.2 BTC never arrived at the address, didn't show up in blockchain, and had the triangle symbol next to it in my transactions log. the "spendable balance" did NOT appear until after i sent the 0.2 BTC.
i left the client open for ~20 minutes before googling the issue, and the multibit sit suggested resetting the blockchain and transactions within the client, so i did.
now, my actual balance reads 1.3 BTC, the 0.2 BTC i sent has disappeared from the transactions log, and now 0.6 BTC is missing in addition to the 0.2 BTC that was "sent"
can anyone explain what's going on to me and how i can get my bitcoin back?
i was able to import my keys from multibit into electrum, and transferred the correct balance into a new wallet. thank you BobAlison and ujka for all your help =)
submitted by wowszaR to Bitcoin [link] [comments]

Is it possible to know which addresses contain non zero balance and their private keys by just using the seed words of the multibit hd wallet?

submitted by yegormintbikgaihain to BitcoinBeginners [link] [comments]

Multibit Wallet

Hey guys, I created a wallet using multibit. I opened my wallet and clicked on file­> add password. Is my wallet secure or should I do anything else to secure it? if so, what should I do?
submitted by VekitNachos to Bitcoin [link] [comments]

Private keys on multiple devices

I'm confused on how I should import wallets. Let's say I have a multibit wallet and I want to spend the balance on that wallet from my iPhone. Since multibit isn't available on my iPhone if I import the private keys of the wallet on, say, breadwallet does the balance in the multibit wallet "go away" and transfer to my breadwallet? So effectively, can you only actively have one wallet to spend from or can you have multiple wallets to spend from?
submitted by nitiger to BitcoinBeginners [link] [comments]

Can any one tell me how to i can transfer my multibit offline wallet to an online blockchain wallet...

submitted by amitahuja1995 to Bitcoin [link] [comments]

Please help me, I have lost access to my wallet

Okay So I have Multibit 0.4.23 installed, and have about 30 odd bitcoins which represent my life savings. I opened up my MultiBit today (after not having accessed it for about a week), and it download hundreds of blocks to be up to date. My wallets are not appearing in the left hand panel, and I am FREAKING OUT.
I made a backup of the .key and I also have time machine which last updated a few weeks ago. What can I do?
submitted by FAT_LOUD_HOUND to Bitcoin [link] [comments] Hacked and Shutdown - 4100 BTC Stolen

From homepage:
Two hacks totalling about 4100 BTC have left unable to pay all user balances. The attacker compromised the hosting account through compromising email accounts (some very old, and without phone numbers attached, so it was easy to reset). The attacker was able to bypass 2FA due to a flaw on the server host side.
Database access was also obtained, however passwords are securely stored and are hashed on the client. Bitcoin backend code were transferred to 10;[email protected]:[email protected] (most likely another compromised server).
What about my coins there? If you stored more than 1 BTC, send an email to [email protected] with a Bitcoin address (preferably, an offline, open source light/SPV wallet like Multibit or Electrum). Use the same email you're using on Inputs. Please don't store Bitcoins on an internet connected device, regardless of it is your own or a service's.
I know this doesn't mean much, but I'm sorry, and saying that I'm very sad that this happened is an understatement.
submitted by masteroflove to Bitcoin [link] [comments]

Secure paper wallet tutorial

This is my handout for paranoid people who want a way to store bitcoin safely. It requires a little work, but this is the method I use because it should be resistant to risks associated with:
  1. Bad random number generators
  2. Malicious or flawed software
  3. Hacked computers
If you want a method that is less secure but easier, skip to the bottom of this post.
The Secure Method
  1. Download (Try going to the website and pressing "ctrl+s")
  2. Put the file on a computer with an operating system that has not interacted with the internet much or at all. The computer should not be hooked up to the internet when you do this. You could put the bitaddress file on a USB stick, and then turn off your computer, unplug the internet, and boot it up using a boot-from-CD copy of linux (Ubuntu or Mint for example). This prevents any mal-ware you may have accumulated from running and capturing your keystrokes. I use an old android smart phone that I have done a factory reset on. It has no sim-card and does not have the password to my home wifi. Also the phone wifi is turned off. If you are using a fresh operating system, and do not have a connection to the internet, then your private key will probably not escape the computer.
  3. Roll a die 62 times and write down the sequence of numbers. This gives you 2160 possible outcomes, which is the maximum that Bitcoin supports.
  4. Run from your offline computer. Input the sequence of numbers from the die rolls into the "Brain Wallet" tab. By providing your own source of randomness, you do not have to worry that the random number generator used by your computer is too weak. I'm looking at you, NSA ಠ_ಠ
  5. Brain Wallet tab creates a private key and address.
  6. Write down the address and private key by hand or print them on a dumb printer. (Dumb printer means not the one at your office with the hard drive. Maybe not the 4 in 1 printer that scans and faxes and makes waffles.) If you hand copy them you may want to hand copy more than one format. (WIF and HEX). If you are crazy and are storing your life savings in Bitcoin, and you hand copy the private key, do a double-check by typing the private key back into the tool on the "Wallet Details" tab and confirm that it recreates the same public address.
  7. Load your paper wallet by sending your bitcoin to the public address. You can do this as many times as you like.
  8. You can view the current balance of your paper wallet by typing the public address into the search box at
  9. If you are using an old cell phone or tablet do a factory reset when you are finished so that the memory of the private keys is destroyed. If you are using a computer with a boot-from-CD copy of linux, I think you can just power down the computer and the private keys will be gone. (Maybe someone can confirm for me that the private keys would not be able to be cached by bitaddress?)
  10. To spend your paper wallet, you will need to either create an offline transaction, or import the private key into a hot wallet. Creating an offline transaction is dangerous if you don't know what you are doing. Importing to a client side wallet like Bitcoin-Qt, Electrum, MultiBit or Armory is a good idea. You can also import to an online wallet such as or Coinbase.
The only thing you need to do is to honestly convert the brainwallet passphrase into the corresponding private key and address. You can verify that it is doing this honestly by running several test passphrases through the copy of bitaddress that you plan on using, and several other brainwallet generators. For example, you could use the online version of bitaddress, and brainwallet and safepaperwallet and bitcoinpaperwallet. If you are fancy with the linux command line, you can also try "echo -n my_die_rolls | sha256sum". The linux operating system should reply with the same private key that bitaddress makes. This protects you from a malicious paper wallet generator.
Trusting your copy of
Bitaddress publishes the sha1 hash of the website at this location:
The message is signed by the creator, pointbiz. I found his PGP fingerprint here:
"527B 5C82 B1F6 B2DB 72A0 ECBF 8749 7B91 6397 4F5A"
With this fingerprint, you can authenticate the signed message, which gives you the hash of the current file. Then you can hash your copy of the file and authenticate the file.
I do not have a way to authenticate the fingerprint itself, sorry. According to the website I linked to, git has cryptographic traceability that would enable a person to do some research and authenticate the fingerprint. If you want to go that far, knock yourself out. I think that the techniques described in this document do not really rely on bitaddress being un-corrupt. Anyway, how do we know pointbiz is a good guy? ;-)
There are a lot of skilled eyes watching and the signed sha1 hash. To gain the most benefit from all of those eyes, it's probably worthwhile to check your copy by hashing it and comparing to the published hash.
"But we aren't supposed to use brainwallets"
You are not supposed to use brainwallets that have predictable passphrases. People think they are pretty clever about how they pick their passphrases, but a lot of bitcoins have been stolen because people tend to come up with similar ideas. If you let dice generate the passphrase, then it is totally random, and you just need to make sure to roll enough times.
How to avoid spending your life rolling dice
When I first started doing this, I rolled a die 62 times for each private key. This is not necessary. You can simply roll the die 62 times and keep the sequence of 62 numbers as a "seed". The first paper address you create would use "my die rolls-1" as the passphrase, the second would be "my die rolls-2" and so on. This is safe because SHA256 prevents any computable relationship between the resulting private key family.
Of course this has a certain bad security scenario -- if anyone obtains the seed they can reconstruct all of your paper wallets. So this is not for everyone! On the other hand, it also means that if you happen to lose one of your paper wallets, you could reconstruct it so long as you still had the seed.
One way to reduce this risk is to add an easy to remember password like this: "my die rolls-password-1".
If you prefer, you can use a technique called diceware to convert your die rolls to words that still contain the same quantity of entropy, but which could be easier to work with. I don't use diceware because it's another piece of software that I have to trust, and I'm just copy/pasting my high entropy seed, so I don't care about how ugly it is.
Why not input the dice as a Base 6 private key on the Wallet Details tab?
Two reasons. First of all, this option requires that you roll the die 99 times, but you do not get meaningful additional protection by rolling more than 62 times. Why roll more times if you don't have to? Second, I use the "high entropy seed" method to generate multiple private keys from the same die rolls. Using the Base 6 option would require rolling 99 times for every private key.
I'm a big nerd with exotic dice. How many times to roll?
Put this formula in Excel to get the number of times to roll: "=160*LOG(2,f)" where f = number of faces on the die. For example, you would roll a d16 40 times. By the way, somewhat unbelievably casino dice are more fair than ordinary dice
The "Change address" problem:
You should understand change addresses because some people have accidentally lost money by not understanding it.
Imagine your paper wallet is a 10 dollar bill. You use it to buy a candy bar. To do this you give the cashier the entire 10 dollar bill. They keep 1 dollar and give you 9 dollars back as change.
With Bitcoin, you have to explicitly say that you want 9 dollars back, and you have to provide an address where it should go to. If you just hand over the 10 dollar bill, and don't say you want 9 dollars back, then the miner who processes the transaction gives 1 dollar to the store and keeps the remainder themselves.
Wallet software like Bitcoin-Qt handles this automatically for you. They automatically make "change addresses" and they automatically construct transactions that make the change go to the change address.
There are three ways I know of that the change problem can bite you:
  1. You generate a raw transaction by hand, and screw up. If you are generating a transaction "by hand" with a raw transaction editor, you need to be extra careful that your outputs add up to the same number as your inputs. Otherwise, the very lucky miner who puts your transaction in a block will keep the difference.
  2. You import a paper wallet into a wallet software and spend part of it, and then think that the change is in the paper wallet. The change is not in the paper wallet. It is in a change address that the wallet software generated. That means that if you lose your wallet.dat file you will lose all the change. The paper wallet is empty.
  3. You import a paper wallet into a wallet software and spend part of it, and then think that the change is in the change address that the wallet software generated. If the transaction did not need to consume all of the "outputs" used to fund the paper wallet, then there could be some unspent outputs still located at the address of the paper wallet. If you destroyed the paper wallet, and destroyed the copy of the private key imported to the wallet software, then you could not access this money. (E.g. if you restored the software wallet from its seed, thinking all of the money was moved to the wallet-generated change addresses.)
For more on this, see here
The hot paper wallet problem
Your bitcoin in your paper wallet are secure, so long as the piece of paper is secure, until you go to spend it. When you spend it, you put the private key onto a computer that is connected to the internet. At this point you must regard your paper wallet address as hot because the computer you used may have been compromised. It now provides much less protection against theft of your coins. If you need the level of protection that a cold paper wallet provides, you need to create a new one and send your coins to it.
Destroying your paper wallet address
Do not destroy the only copy of a private key without verifying that there is no money at that address. Your client may have sent change to your paper wallet address without you realizing it. Your client may have not consumed all of the unspent outputs available at the paper wallet address. You can go to and type the public address into the search window to see the current balance. I don't bother destroying my used/empty paper wallet addresses. I just file them away.
Encrypting your private key
BIP 0038 describes a standardized way to encrypt your paper wallet private key. A normal paper wallet is vulnerable because if anyone sees the private key they can take the coins. The BIP38 protocol is even resistant to brute force attacks because it uses a memory intensive encryption algorithm called scrypt. If you want to encrypt your wallets using BIP38, I recommend that you use bitcoinpaperwallet because they will let you type in your own private key and will encrypt it for you. As with bitaddress, for high security you should only use a local copy of this website on a computer that will never get connected to the internet.
Splitting your private key
Another option for protecting the private key is to convert it into multiple fragments that must be brought together. This method allows you to store pieces of your key with separate people in separate locations. It can be set up so that you can reconstitute the private key when you have any 2 out of the 3 fragments. This technique is called Shamir's Secret Sharing. I have not tried this technique, but you may find it valuable. You could try using this website which will help you split up a key. As before, you should do this on an offline computer. Keep in mind if you use this service that you are trusting it to work properly. It would be good to find other independently created tools that could be used to validate the operation of passguardian. Personally, I would be nervous destroying the only copy of a private key and relying entirely on the fragments generated by the website.
Looks like Bitaddress has an implementation of Shamir's Secret Sharing now under the "Split Wallet" tab. However it would appear that you cannot provide your own key for this, so you would have to trust bitaddress.
Durable Media
Pay attention to the media you use to record your paper wallet. Some kinds of ink fade, some kinds of paper disintegrate. Moisture and heat are your enemies.
In addition to keeping copies of my paper wallet addresses I did the following:
  1. Order a set of numeric metal stamps. ($10)
  2. Buy a square galvanized steel outlet cover from the hardware store ($1)
  3. Buy a sledgehammer from the hardware store
  4. Write the die rolls on the steel plate using a sharpie
  5. Use the hammer to stamp the metal. Do all the 1's, then all the 2's etc. Please use eye protection, as metal stamp may emit sparks or fly unexpectedly across the garage. :-)
  6. Use nail polish remover to erase the sharpie
If you trust electrum you might try running it on an offline computer, and having it generate a series of private keys from a seed. I don't have experience with this software, but it sounds like there are some slick possibilities there that could save you time if you are working with a lot of addresses.
Message to the downvoters
I would appreciate it if you would comment, so that I can learn from your opinion. Thanks!
The Easy Method
This method is probably suitable for small quantities of bitcoin. I would not trust it for life-altering sums of money.
  1. Download the website to your hard drive.
  2. Close your browser
  3. Disconnect from the internet
  4. Open the website from your hard drive.
  5. Print a paper wallet on your printer
  6. Close your browser
submitted by moral_agent to BitcoinWallet [link] [comments]

MY BCH has still not arribed after 30hours

hi to all!
i am new here and face a problem that i cannot solve. so i thought i ask you to tell me what could be done:
i use awebpage wallet where i can buy btc and bch and yesterday i sent btc to another wallet(shpaeshift) so the could exange it to bch. the transactions where all confirmed by around 175 blocks and the status shows that it was sent. but the receiver said that nothing attived.
and what is thise balance think here on the blockchain? 14BCH
i also checked the details on blockchain info. here i can see the word (unspent/not used) next to the wallet address of the receiver.
from my site it looks that all is done correctly. but receiver says that he did not receive.
what is the problem? why it is somehow stuck? what can i do now? i checked in the help section of multibit and tried different things.. but the result is still the same. receiver says he did not get.
i hope someone of you guys can help me and tell me what i need to do.
thank you very much in advance.
thise is the link to the my adresse on the block chain my addresse is ofc bitcoincash:qzcxkwwspvrse3n9uaacn5c2389n8zzceqv0nhv50k and all the once from 28 may- 29may are not yet in my wallet. why and what like i said is thise 14.464BCH balance. if i search up my btc addresse it says 0 btc balance. does thise mean something?
on shapeshift its all done and good. they never failed me before
submitted by jackcchan to btc [link] [comments]

Please Help! Lost BTC moving BTC from Multibit (2013) to BlockChain..

Hi folks I managed to salvage some bitcoin (0.58 btc) from an old multibit wallet (from 2013/2014) and I uploaded the private keys into the wallet and luckily (I thought) that the 0.58 btc appeared. However, I thought that multibit was too old to be storing them (and have read online that it is now not recommended) and decided to try move them to a Blockchain wallet account (I'm new to all this and bought the coin back in 2013/2014). So anyhow, I thought it might be a good idea to reset the block-chain just to get everything running ok- and after I did that - the wallet said that I had only something like 0.33 as a spendable amount. I was worried about this so I decided to test a small bit of coin (.0005) and send it to my new Blockchain wallet. It went through quick , and then I thought I will go ahead and send a little less than the 'spendable amount' (still not the full amount but thought it's something) , after I did this- nothing happened- apart from my balance was now down to .02 btc or something- but the transfer of BTC never arrived in the new blockchain wallet. I waited an hour and I then panicked, and I reset the the multibit again. after 45 mins - it synced with the blockchain- and my balance is now .20 bitcoin. I am afraid to move anymore in case I lose more btc, I checked the new blockchain address (where I supposedly sent the coin to) and there has been no activity on it, and I checked my original wallet on my multibit on bolckchain (from 2014) and it shows the full balance (minus the small btc that successfully transferred as I mentioned). So my question is- what happened to my btc? is it still on my pvt key (from the 2014 btc multibit wallet) or is it stuck somewhere on the way to the new blockchain address that i created? . Bear in mind, I am new to all this and have been trying to understand the tech of btc as I have moved along this issue. Please Help! Not sure what to do, afraid to move the BTC, afraid to use multibit but have some balance in it, and have no clue how to recover the missing btc... :(
submitted by Irishbit40 to Bitcoin [link] [comments]

I have a Bitcoinfession and a plea: Don't gamble.

Hi everyone, I know very few people will see this and that's okay. I decided after a week of severe depression, anxiety, self-loathing, and general fucked up thoughts that I needed to talk about what I did. On the scope of a confession, it isn't much to some people, but to me it is a huge and daunting fuck up that I'll be paying out the nose for. The reality is I might even be homeless due to this. I used a throwaway for this because a few people I know have my primary acct and I can't bear the shame of them knowing yet.
To get to it, I made a huge mistake and lost all my money. ALL OF IT.
If it isn't obvious already, I don't have a lot of money. I am not a all that familiar with bitcoin and only recently began taking part in the community. /Bitcoin has been my bible and go to source nearly every day for the last 6 months. But again, I don't have much money and I decided that I have a this tremendously good feeling about where bitcoin is going so I warily invested in a couple coins around January 2nd at about 809 a coin from coinbase. I was terrified of losing what I put in. Then the next day, the price jumped about $30! I was ecstatic! I was amazed! I couldn't believe that my investment had begun working for me after only a day! It was a great feeling.
At the same time of all this, I had just finsihed up a huge ordeal with Bank of America over fradulent charges on my debit card that sent my account into the negative and had intitially accured almost $1000 in overdraft and other fees. It took months to get all my money back and in the end still lost out on about $200 dollars. Needless to say, I was more wary of my bank than bitcoin at this point and bitcoin was GIVING me money instead of giving it away. So I did the only logical thing I could think of at the time and put the rest of my savings into BTC.
And guess what? It went up again! I was so happy with my decision that I started reading more and more about BTC.
Then the fluctuations in the BTC market started happening. I started to get nervous because the only cash I had was losing value and fast. I knew that it had a habit of fluctuating like that but I never had any money invested before. The anxiety was real for me every day I'd hop on /Bitcoin and see the news about mtgox ( then after that the silkroad 2 hack.)
So, about a week ago when coinbase's price was plummeting still due to gox's problems and bad press and so on I started getting nervous. More nervous than I had been before. My "investment" had lost almost 200 a coin and I was sick to my stomach watching and waiting for the price to come back up like it "always" does.
I was posting around a few forums and asking questions about what I should do? What could I do in the mean time? Should I pull out and take my losses? I got to talking to this guy on one of the forums who seemed to know what he was talking about. He mentioned the dice site satoshi bones and how he was in the same spot as me, made one bet and came out 10BTC richer. Even sent the tx ids. It was awesome to see and was even more awesome to imagine. He went as far as to send me .05 btc (holy shit!) and said "Make a few bets and watch, some of the odds are great."
So I did that. I sent a few bets of .001btc and made nearly .5 btc in 5 minutes. I was hooked. I was going to make my money back. I was going to make a few bets and get out with what I put in, no more.
So I proceeded to make bigger bets. I was making money. I was getting good at watching and "considering the odds." It wasn't really the case, I was just geting lucky here and there. I had no idea what the fuck I was doing.
Then the transaction malleability thing happened. Or, rather, it was probably happening the whole time. I don't know. I don't know what it did to my MultiBit account, but it was sending my coins and not updating my balance. I was losing more than I knew because the double spends ended up looking like I had more in my overall account than I did. At one point, it appeared that I had TRIPLED my initial BTC investment over all and I was nearly crying with joy.
Then I couldn't access my funds. It said I had a "Balance" of 30btc, but "Spendable" was .05. I knew that it took a little while for the transactions to get through the system and clear but minutes turned into hours and hours into days.
When the whole story about the transaction malleability broke into full swing I started tracing my tx IDs back. I was a nervous wreck at that point. I had so many double spends and unconfirmed transactions that there was no way to actually find out how much I truly had left. When I looked through multibit's logs, it had mulitples of the "wins" that I knew I had but numerous tx Ids. I couldn't keep track of it all. Attempting to "reset" the blockchain on Multibit would only cause it to crash (probably because I had sent and received sooooo many unconfirmed transactions back and forth between that game.)
I decided to grab my private keys and attempt to use Bitcoin-QT to sort it all out to no avail. It too said I had a balance around 30 BTC unconfirmed (a mind blowing amount of money for me!!!!!) I relaxed and decided I would just have to wait it out to get my money and I'd hold off on grocery shopping until the weekend (today.) Even if I had half of that after it all cleared up, I'd have made a HUGE profit.
About two days ago everything calmed down and my balance began fluctuating like mad on both the Multibit client and Bitcoin-qt. It went UP at one point to 40 BTC even! Then transactions started to disappear. Mostly, the transactions that disappeared were the "wins." I assume this is because all of the unconfirmed txs or double spends started being pushed out of the system? I have no idea.
I'll take a second to mention that I've never had an interest in gambling whatsoever. I've been to vegas, played a few slots, sat in for some poker and blackjack, would lose and just walk away. However, the last couple days I was consumed by the dice game. I thought I was making incredible money, hand over fist.
Yesterday, my balance completely cleared up. I'm broke. I have nothing left. I pissed away even my winnings (maybe 3btc) I had before the transaction malleability started fucking things up. I cried for the first time in 10 years yesterday. Today, I cried again.
Over the last week I fell into a depression and was overcome by this urge to just stop existing. Not really suicide at first, but, more of a "I want to close my eyes and let it all blow over." Then, when that didn't happen, I did start considering suicide. I have no money left. I don't know what the fuck I'm going to do for rent, for food, for gas, for my fucking books next quarter. I moved to california on my own about 3 years ago and have zero family in the area. I don't have family to lean on finacially whatsoever (I come from a seriously bad luck/misfortune/poor family.) Monday I'll be heading to my university to find out what I can do and if I qualify for any loans. Or something. I don't know. But right now, I need to tell people and persevere and try to make it out of this.
But, my point of posting here isn't a pity party or to draw out "sorry for the bad luck" responses. I did this to myself and this pales in comparison to the bad luck others have had.
I want people to use my sincere and obvious FUCK UP as a lesson. I got caught up thinking I was making money. I wasn't fully aware of what was happening during the transaction malleability shit and made decisions without fully comprehending the situation (and it is NOT the fault of Mulitbit or the dice game even if I wanted something to blame.) Most of all, I was GAMBLING my money away. It was greed and poor decisions. But mostly greed.
So, I fucked up. I don't want YOU to fuck up like I did. Please look at the story and realize that it can happen to anyone without fully thinking through your decisions and having a grasp on the situation. And SERIOUSLY consider when you're putting too much money at stake when gambling. You could regret it and be in a shitty spot like myself. Thanks for reading.
TL;DR Holy shit I wrote a novel. Sorry. In short, I inadvertently gambled away my only $7000 during the transaction malleability crisis and it is no one's fault but myself. I am now broke and terrified and I don't want YOU to suffer like I did. Do not gamble and do research before you do anything with your money especially if it is all you have.
EDIT: Though my intial reason for posting was NOT to focus on why my balance said one thing and the actual balance was another, here is what the balance looks like on my Multibit client right now. However if you look at the blockchain, that's clearly not the case and hasn't been for days and days. These are the addresses I used off and on. Not all of them but those were the most active I think. 17cHzgxRLumqfu6UAddUrJmTujd7goHLrx 1BAKHq37qj1xekitr7adXapLqFrVtAhm8A 1KLug6D1mXoyS12BZipyQ8WHAdNzDmQxMp. Also, when I opened the Client today it seemed to send or revieve "stuck" transactions? I don't know what to tell you all beyond that.
submitted by DontBeStupidLikeMe to Bitcoin [link] [comments]

Keepkey second look

In follow-up to this earlier post from Stellaw, today I too received a developer pre-release keepkey. Like Stellaw I did not pay for the device and they only asked me for developeuser feedback.
The package was sent via FedEx protected by more foam than a bitmain S1, the keepkey comes packaged in a classy black box (about the standard of designer cufflinks packaging) on a green/white cardboard tray, with a plastic film protecting the screen.
Underneath you'll find a stiff 3 ply cardboard 12 row Recovery Sheet, in a matte black sleeve, and a skinny micro USB cable with a nylon rope finish.
I've taken some photos of keepkey with some everyday items you might find lying around your home for scale and comparison
Keepkey is much wider, longer and thicker than Trezor. It does however feel extremely satisfying and solid in hand with its metal back shell.
The screen is fantastic to use, keepkey include some eye candy animations, progress indicator, and logo screen saver.
Side by side, Trezor's display is over twice as bright and of higher pixel density than keepkey, but with indoor use keepkey is adequately bright. The front shell is a fingerprint magnet.
I don't plan to fully review their software wallet as it is still in pre-release developer beta stage. Keepkey works via desktop Chrome with 2 extensions (a proxy bridge and a Chrome Wallet). This solution is up an running with a few mouse clicks and supports device initialisation and wipe, PIN entry, send, recieve and display QR code. Their wallet reminds me somewhat of kryptokit.
At the moment the Chrome Wallet does not support >12 word mnemonics or passphrases (although Darin tells me this will be supported) nor changing PIN or device label, message signing, or transaction history. Their chrome wallet checks balances through chain's API and is not dependent on a BoP server like myTrezor.
After some trial and error i was able to import my keepkey wallet into electrum 2.4.4 and saw the same balance and address tree as the Chrome Wallet.
As the python tools and electrum plugin are dev beta standard, there are some bugs still to be ironed out, particularly with regards to passphrase support.
My overall impression is that keepkey will be a winner. With its wide screen display, keepkey is very easy on the eyes and makes checking of an address, transaction details or initializing a mnemonic (or reviewing entropy/firmware signatures) a pleasure.
Keepkey is evolutionary in several ways - much improved mnemonic playback and restore. They've re thought the user experience, removed the cancel button, and added a hold-to-confirm gesture. This does however mean "cancel" requires either a mouse or keyboard button press.
In other ways the changes don't go far enough, why limit PIN to numbers 1-9, why not device wipe after multiple failed attempts, why must the passphrase be entered in plaintext on the hot computer, why no touch screen and fewer buttons not more?
Keepkey's firmware is a fork of Trezor's, has had hundreds of code commits since March 2014 and is actively developed. With its solid half metal construction, premium packaging, USB cable and security card, and 4 person management team - clearly keepkey is not targeting the budget end of the market.
Metal Trezor preorders were 3 times the price of plastic Trezors and keepkey has the differentiating features of premium metal build and finish, large screen and a mnemonic restore procedure so good that it is viable to wipe the device in between uses and restore to spend.
Their Chrome Wallet is missing many features, and currently there is no support for Greenaddress, mycelium or MultibitHD. (Whilst Trezor does support these 3 it took Trezor years before the first alternative - electrum 2.0 - became available)
Addendum : working with keepkey today they've isolated, fixed and developed a workaround for most issues I encountered. Now the official OSX electrum 2.4.4 binary works perfectly - 24 word mnemonics, passphrases, message signing, change device label, full wallet history with modifiable descriptions.
submitted by Aussiehash to Bitcoin [link] [comments]

My first experience with bitcoin was NOT positive :( + Questions

After seeing an interesting comment on /funny in which bitcoin currency is used to make tips across reddit I started to investigate and learn about the Bitcoin. I had heard about it before but I didn't know how it worked or what I had to do in order to use it.
A dozen Bitcoin Wiki entries later I download bitcoin-qt and create my first wallet. The system seemed very easy and straightforward and I had already started to apply for "free starter bitcoins" when I met "synchronization".
Now synchronization is not necessarily a deal breaker but it was annoying as hell. I'm using an old computer and it seemed as if it would take at least a day if not more to complete the whole process... and during that time my computer was getting slow as hell.
Now I'm quite a tech savy person and I know why in this P2P based system this is important, but for anyone else this would be unacceptable. Imagine elder people or not so tech savy persons trying out the system for the first time and noticing that they can't use it without occupying 2+ GiB of their HardDrive and having to wait a lot.
I did not complete the sync and tried to use the multibit instead. But since I had already applied to the Free starter bitcoins on some websites I wanted to keep my old wallet. I try to look for an import/export button but it seems that Bitcoin-qt doesn't support exportation and I needed to use a third party application called pywallet (command line!) to export my wallet and convert it into another plaintext format since the format used by bitcoin-qt was not supported by multibit.
And one would assume that the first thing you do when creating such a currency is to define a standard for the wallet and the applications. Again, I know how to use the command line but anyone who doesn't and who just wants to try out the system for the first time would be inmediately turned off by this limitation.
These are all issues that need to be fixed and addressed. Also, at the current situation it is much more comfortable and easier to set up an e-wallet than using standalone software on my computer. And if you ask me, it beats the purpose of creating a decentralized currency when in the end the most popular e-wallet services are going to hold most bitcoins and suppose a great security risk.
So I ask you: do you know any solutions to the above mentioned problems? Is there any way to reduce the impact by those hindrances?
And now to the questions:
Since I'm a very inquisitive mind and I'm still very much interested in bitcoins I would like to ask some questions I couldn't find properly answered in the wiki about the nature of the bitcoin system and how exactly it works.
I'd be very grateful if you could answer any of the following questions:
1. What exactly is a bitcoin? A string of text? A hash? A file with a string of text?
2. If I'm not mistaken, a bitcoin wallet is made of a public key and a private key. If I want to transfer my wallet from one program to another or a piece of paper... would I need to export or print out the strings of text that form the bitcoins itself or do I just need those two keys?
3. How does the bitcoin system know how much balance is inside an wallet/account. Does it typically ONLY check it against the chainblock or does it also make use of any bitcoin strings stored inside the wallet?
4. Cryptographically speaking... what happens when I transfer bitcoins?
Thank you!
*Please don't downvote me just because my first experience was negative. I'm still very interested and would like to learn a lot more. *
Edit: Thank you very much for all your answers! I can't reply to all of you (mainly because it's very late over here) but I feel that I understand the concept much better and also feel much more comfortable knowing that the only thing I ever need is my private and public key. It makes me care much less about software and files, knowing that I can have everything I need written on piece of paper or saved in an encrypted file of my own. Then, when I need to spend bitcoins or check my balance I can use whatever software I deem best at the moment.
Thank you!
submitted by DanielTaylor to Bitcoin [link] [comments] Stress Test Analysis

Yesterday, conducted a stress test of the Bitcoin blockchain. Not only was our plan to see the outcome, but also to see how easy it would be for a malicious entity or government to create havoc for the Bitcoin community. As you will see from the analysis below, delayed transactions are not the only issue that Bitcoin users experienced.
Surprisingly, executing tens of thousands of transactions that correctly propagate to the network simultaneously is not as easy as we had expected. One of the methods that was used to increase the kb size of our transactions was to send transactions consisting of numerous small outputs (usually 0.0001) to make a single transaction of 0.01. A simple transaction is usually 225-500 bytes, while many of our transactions were 18 kb (A number which limits the blockchain to 5 transactions per minute). In our preliminary testing this was effective, however in practice it caused our servers to crash. Throughout the day and evening, our strategy and methodology changed multiple times.
Initially the plan was to spend 20 BTC on transaction fees to flood the network with as many transactions as possible. Due to technical complications the test was concluded early, with less than 2 BTC spent on fees. The events of yesterday were accomplished with less than €500.
The following graph depicts the entire test from start to finish:
Delayed confirmation times and large mempool buildups were not the only observation that came from our testing. Many more services were impacted than we had initially envisioned.
Over the past few months, has become increasingly unreliable, however we are confident that yesterday's stress test had an impact on their website being offline or broken for 1/3 of the day. During periods where we sent excessive transactions, consistently froze. It appeared as though their nodes were overwhelmed and simply crashed. Each time this occurred, the site would re-emerge 10-30 minutes later only to fail again shortly thereafter. Users of the blockchain wallet were unable to send transactions, login or even view balances during the downtimes. In response to our heavy Bitcoin usage, began to exclude certain transactions from their block explorer. This issue is explored further by the creators of Multibit, who can confirm that some transactions sent from their software were ignored by Blockchain, but were picked up by Blockr.
Bitcoin ATMs
Many ATMs operate as full nodes, however some ATMs rely on third party wallet services to send and receive transactions. The most prominent Bitcoin ATM of this type is Lamassu, which uses the API to push outgoing transactions from a wallet. Due to the issues, all Lamassu ATMs that use's wallet service were unavailable for the day.
Both versions of MultiBit suffered delayed transactions due to the test. Gary and Jim from MultiBit have created a full analysis from Multibit's perspective which can be read at
The outcome was that transactions with the standard fee in Multibit HD took as many as 80 blocks to confirm (Approximately 13 hours). Standard 10000 satoshi fee transactions took an average of 9 blocks to get confirmed. Multibit has stated that they will be making modifications to the software to better cope with this type of event in the future.
With broken, we frequently referred to Tradeblock to track the backlog. Unfortunately Tradeblock was less than perfectly reliable and often failed to update when a new block had been mined. Regardless, at one point 15,000 unconfirmed transactions were outstanding.
Users reported issues with Bitpay not recognizing transactions during the test.
Increase of $2. Contrary to some predictions, we did not short Bitcoin.
Green Address
While this app was not hindered directly by our test, we did send a series of 0.001 payments to a green address wallet. When attempting to craft a transaction from the wallet, an error occurs stating that it is too large. It appears that the coins that were sent to this wallet may be lost.
From a technical perspective, the test was not a success. Our goal of creating a 200mb backlog was not achieved due to miscalculations and challenges with pushing the number of transactions that we had desired. We believe that future tests may easily achieve this goal by learning from our mistakes. There are also numerous vulnerable services that could be exploited as part of a test, including Bitcoin casinos, on-chain gambling websites, wallets (Coinbase specifically pointed out that a malicious user could take advantage of their hosted wallet to contribute to the flooding), exchanges, and many others. Users could also contribute by sending small amounts to common brain wallets.
We also learned that the situation could have been made worse by sending transactions with larger fees. We sent all transactions with the standard fee of 10000 satoshis per kb. If we had sent with 20000 satoshis per kb, normal transactions would have experienced larger delays. In our future stress tests, these lessons will be used to maximize the impact.
submitted by CoinWalleteu to Bitcoin [link] [comments]

opening an old wallet.dat

I had about $8 USD worth of bitcoin in a wallet, and I backed up the wallet.dat to my dropbox. According to the modified date of the file this was in April 2013, so it was probaby from bitcoin qt version 0.8.1, or maybe a little earlier.
I basically left it there and haven't done anything with bitcoin since then. Since it is worth probably at least $100 now I decided to check the exact amount.
I downloaded the latest version of bitcoin core, added the wallet.dat file to the data directory, started it with -rescan, and waited almost a month (!) for the blockchain data to get up to date. The balance showed as 0 the whole time. I thought it would update once the blockchain was totally downloaded, but it still just says 0.
Is this a problem with old vs new versions? Did I do something wrong? Next time, should I expect the balance to show a non-zero amount even if I haven't downloaded the whole blockchain yet?
Update: ok, I feel kind of dumb, turns out the transaction was made in a multibit wallet, not a bitcoin qt wallet, but I still have a copy of that too. I opened the wallet in the latest version of multibit classic, and it has the receiving address in question, and checking the address on I can see that it received the transaction... but the transaction and the balance both don't show in the program. I wonder if I need the same multibit version I had before? the transaction was made in feb 2014
Update 2: was able to use the private key to sweep the balance into electrum
submitted by valanbrown to Bitcoin [link] [comments]

Update: Retrieving coins

Alright here's where I'm at. I have the wallet.dat file, and I have a file labeled multibit.key (which I'm assuming has to do with bitcoin, not doge). I didn't have the Dogecoin-QT app on my computer anymore but I did have a backup of my computer so I restored the app and now have it open but it is not syncing. According to the ELI5 that doesn't matter though. It says in recent transactions I tried to send out all of my doge to my reddit account but since it wasn't synced I don't know if that went through (although balance says 0). I tried using the help-debug-console where you do dumpprivkey "address" and it says that "Private key for address 'address' is not known (code -4)". I forgot to unlock before trying to get the private key. I now have my private key, but when I try to import to MultiDoge it wants a file instead of pasting the private key in. Would anyone know where to go from here? I used dogechain to import private key and it now shows full balance. I think I did it? Yep, I did it. Keeping the post up for future searches, hopefully it helps someone else.
Side question: Since the old dogetipbot is gone I can no longer access history or balance, what happened to the doge I had in that account? Is there a way I can access it?
submitted by JamrJim to dogecoin [link] [comments]

Transferring to hardware (ledger) wallet and I am having issues

Hi everyone. I have run into an issue transferring to a hardware wallet and I really need some help.
Here is the sequence of events up until now
I set up the Nano and sent a small amount of bitcoin to it as a trial using Multibit (old I know). The transaction was visible almost instantly on the Hardware ledger.
I wiped the nano and restored it using my seed to be sure the process worked and that I still had the bitcoin I had sent to it. During this process it created a new address
I then sent all of the BTC on my multibit wallet to the new address for the nano. I checked the address was correct several times.
At this point my multibit wallet said 0 balance but NOTHING posted to the hardware ledger. It still only has the first small transaction on it. I am trying not to panic as a blockchain search of my original wallet still shows the bitcoin there and no pending transactions, so I think the coin is still there.
I have since taken my PC offline and generated a private key for the wallet and stored it off the computer. I also rebuilt the block in multibit but after doing that it shows a strange balance in the wallet that makes no sense given the transactions I made.
other info I was not able to set a fee for either transaction. The multibit wallet simply told me what the fee would be. It was around 2.00 for the first and 7 for the second, however the second transaction was MUCH larger than the first ( 1000 times larger)
I would really appreciate any insight into what has happened. I have been considering downloading another wallet and using the key I generated to access the BTC. I want to hold off on that as to not complicate this more.
Thank you for any help you can give.
submitted by Austinswill to Bitcoin [link] [comments]

[mod post] /r/Filmmakers is now bitcointip enabled!

/filmmakers is a fairly technical subreddit, so we thought we'd enable bitcoin tipping. We're going to address some questions that may come up below:
Q: What are bitcoins?
A: Bitcoin is an online money that's open-source, decentralized, and potentially anonymous. This is the local currency of the internet. You can exchange it for your own country's local currency, or you can spend it directly on sites that natively accept it. At the time of writing, a bitcoin is worth about $70.
Q: What are they good for?
A: Bitcoins can be used as an investment, barter currency, to purchase products (Wordpress, Reddit, 4chan, Wikileaks, and many others accept bitcoins natively), or just to convert to regular currency.
Q: Where can I get bitcoins?
A: You can setup a free wallet online or by downloading a bitcoin client. Once you have a wallet, you can buy coins via various services or get a small amount of free bitcoins to play with.
Q: How do I tip bitcoins? How do I receive my tip?
A: Check out this handy infographic. Once you've got that down, you can check out the bitcointipbot documentation for more details.
If you want to make the process even easier, you can install the Bitcointip User Script which lets you easily tip without having to type out the bitcointip syntax. It also displays your bitcointip balance, so you can easily see if you have enough funds before tipping.
A: Bitcoins are internet currency. If you have bitcoins, you can tip them to people in /filmmakers by commenting "+bitcointip Username Amount" provided you have set up your account.
I know there are some users in the subreddit far more involved with bitcoin than us mods, so I'm sure they'd love to help clarify.
submitted by ancientworldnow to Filmmakers [link] [comments]

unspendable / missing bitcoins

My address on blockchain info it says that i have 5.5 bitcoins left to spend but in my wallet the balance is 0.1 .
I am currently using multibit classic and have tried the “reset blockchain and transactions” option in tools but it did not fix the problem
Does anyone know how this happened or how i can fix it?
This is the blockchain link to my address.
submitted by Rbitco to Bitcoin [link] [comments]

Questions about Bitcoin Core vs Bitcoin XT

So, my basic understanding is that Bitcoin XT does a few things differently than "normal" bitcoin wallets, and that Bitcoin XT uses the normal blockchain but down the road if everyone starts using XT the "normal" wallets won't work anymore.
Here's what's confusing me... I'm trying to stop using Bitcoin Core because I don't want the whole blockchain on my computer (seriously, one power outage and my wallet is down for two days). I transferred the BTC I have from faucets and whatnot to Multibit HD. I downloaded and installed Bitcoin XT. Bitcoin XT is showing my wallet balances and transaction addresses from Bitcoin Core. What's up with that? When I installed XT, I changed the installation folder to "Program Files\Bitcoin XT" beacuse I knew that Core was installed to "Program Files\Bitcoin".
I have a few specific questions:
I should mention that my Bitcoin Core wallet is encrypted and I do have a backup ".dat" file.
I'm just kinda confused about all of this. Any info would be appreciated.
submitted by LiberalDutch to BitcoinBeginners [link] [comments]

WOW !This is difference of VTA with other coins : VirtaCoin addresses are similar to Bitcoin addresses and can be used to send and receive Bitcoins as well.

Well, VirtaCoin addresses are similar to Bitcoin addresses and can be used to send and receive Bitcoins as well. You can also send VirtaCoins to a Bitcoin address and Bitcoins to a VirtaCoin address. A single VirtaCoin or Bitcoin address can as well be used to separately manage balances of both crypto-currencies. VirtaCoin is the first and only scrypt-based coin to do all this. Here is an example of a VirtaCoin address: 1HgtXf8HnWVYrGoSAkCyAWwAMHp7gUW2gR As you can see it starts with a "1", just like most Bitcoin addresses. VirtaCoins can be sent to Bitcoin addresses that begin with a "3" such those provided by GreenAddress. "3" Bitcoin addresses can be used to send Bitcoins to VirtaCoin addresses as well. Using Private Keys To Manage Dual Balances You will need to know the private key of your VirtaCoin or Bitcoin address to be able to view and manage the opposite balance of the wallet that originally created the address, meaning for a VirtaCoin address created with VirtaCoin Core you'll need the private key in order to see any bitcoins sent to that VirtaCoin address in a Bitcoin wallet. Exchanges and most online wallet providers don't normally give you the private keys of your VirtaCoin or Bitcoin address so its best to use addresses created from wallets that you have total control of, such as desktop or mobile wallets. Desktop wallets such as MultiBit can be used to export the private keys to a file on your computer while mobile apps such as Bitcoin Paper Wallet can generate addresses with private keys. To use your VirtaCoin address as a Bitcoin address in your Bitcoin Wallet simply import the private key of your VirtaCoin address into your wallet. The popular Blockchain Wallet works well with importing your VirtaCoin address and can reveal your VirtaCoin/Bitcoin address (public key) if you only know your private key. Similarly you can use the private key of your Bitcoin address to import the address into the VirtaCoin Core wallet. Just follow these steps, specifically on importing a private key into VirtaCoin Core. Please remember to backup your wallet before importing another address into VirtaCoin Core.
Please donate me VTA for this great info at address:
submitted by huyhpvn to VirtaCoin [link] [comments]

Hack Find Private Key of any Bitcoin Address 100% Real How to get a Bitcoin Wallet Address - FREE & in under a ... brainflayer Bitcoin Real Adder! 2019! inject Privat Key scrapper - YouTube Bitcoin privatekey Brute-force LIVE (read description)

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