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Partially redeeming a Casascius physical bitcoin - help request

Overview of problem
I have a Casascius physical bitcoin and I am unable to add its digital contents to a wallet. It seems that the key is not the right length or format. I started to get out of my depth with talk of things like a Minikey format.
I removed the hologram when I was given it years ago as I was curious what was under there. I don't want to sell it instead I want to add its 1 BTC value to a wallet so I can partially redeem it and keep the physical brass as a collectible.
What I have observed and tried (apologies in advance for butchering terms)
I've searched several sites, including here and haven't been able to find a current answer for the new style of keys and wallets.
I put the seven character code from the hologram into the casascius.uberbills dot com site and it gives me a 33 character key, tells me it's version 2 and confirms that it has a 1 BTC value
I've tried to import it into a Blockchain wallet but get the error "this private key does not match the watch only address above" when I enter the private key under the hologram. For some reason it seems like a different public address is generated when I enter the 33 char code.
I tried to import it into a Jaxx Liberty wallet but it doesn't recognise the minikey or 33 char code as valid.
I've basically run up against my level of knowledge and don't know what the next steps are of if I'm missing something bleeding obvious. I double and triple checked any data entry because I saw this was a common problem.
I'd really appreciate any help or pointers the community can give me.
I followed the advice given by u/murbul in reply to my post
You might struggle to find a wallet that natively supports MINI keys these days since it's an old format that never really took off apart from Casascius coins. So your best bet is to use a tool to convert it to a real private key (starting with 5) and import/sweep that into a wallet.
You can convert it on the Wallet Details tab of - For 1 BTC I'd be paranoid enough to recommend downloading the source and doing everything offline:
I used the site and one of the keys generated was one starting with '5' (Private Key WIF). I used this in Jaxx Liberty in the 'Paper Wallet Import' function under tools and it came right across.
I’m very happy.
submitted by PickledNumbat to Bitcoin [link] [comments]

Paper Wallet Vanity addresses.

EDIT 2/21/2020. I am no longer offering the service described below as I no longer have access to the necessary hardware.
Hey all,
I have recently been messing around with vanity addresses for paper wallets. After a little tinkering I got the system working well and can generate wallets up to a certain complexity quite reliably.
I've been able to generate wallets like this one: 1Bitcoinjqekek8HwmT8Cp8ojH9b7Quhzi
This one: 1Satoshi3A43v3Jk9MpfJPUDrWadFUUP6
And this one: 1Genesisud7wjt8Lkto75ANupmviwC2wpW
I personally haven't been using paper wallets for cold storage until now, but with the value of BSV going up and also having read the following paper about the possibility (albeit very small) of compromise of private keys in HD wallets, that for the BSV I intend to sit on long term, it's probably not the worst idea ever to use a paper wallet for that. But hey, it would be nice if those addresses were a bit more recognizable than a random address, am I right? :)
In going through this exercise, I happened to notice that there are services out there that will generate these kinds of addresses, but they seem overly expensive!
e.g., At they want 1 BTC(!!) to generate an address starting with "Satoshi" e.g., like the "1Satoshi3A43v3Jk9MpfJPUDrWadFUUP6" I generated above. That's day-light robbery!!
Furthermore, the above service treats split key generation (which seems necessary for security when having a third party generate the wallet) as an "advanced" feature only. Imagine paying 1 BTC for an address only to have the private key compromised! (Seems almost negligent).
So anyway, whilst I have this system set up and working, I was thinking I could extend a temporary offer to anyone who is interested in getting a vanity address (or addresses) for paper wallet cold storage.
So all that said, the procedure, following the secure split key approach, would be as follows.
  1. You would go to and download a local copy of the web site (and validate it against provided signatures).
  2. Run that downloaded copy of web site on an off-line system.
  3. Click the Vanity Wallet Tab.
  4. Click the "Generate" button in Step 1.
  5. Copy the public key from Step 1 and PM me with that key (it's quite long so copy/paste is the way to go). Also indicate in the PM the address prefix that you want (can't include invalid characters; I will tell you if you included any). Be sure to keep a copy of the private key from Step 1 (or keep the web page open). If you lose this key the whole process will be for nothing. Do not lose (or compromise) it (and definitely do not PM it to me!).
  6. Send payment (as per the schedule below) to 1Satoshi3A43v3Jk9MpfJPUDrWadFUUP6 and PM me the TxID.
  7. When I receive payment, I will generate a partial private key that you need for Step 2 in the page.
  8. You take the partial private key that you generated in Step 1 (that you keep secure and never shared with anyone) and paste it into the first box in Step 2 in the page (that you are still running locally and off-line).
  9. Finally, you paste the partial private key that I PM you back, into the text box where it says "Enter Pool Part Private Key (from Vanity Pool):" (Note: PMing this partial private key is fine; so long as you keep your partial private key secure (from Step 1), the process is still secure; the process is intended to work this way).
  10. Click "Calculate Vanity Wallet" et viola! A wallet will be produced that meets your prefix requirement and is 100% secure since the partial private key that you generated in Step 1 never left your control.
What you do with your new shiny address from that point on-wards is your prerogative, the same as any other paper wallet that you produce. Our deal is done.
The pricing schedule for this (temporary) service is as follows:
  1. 3 Characters (e.g.,) 0.01 BSV.
  2. 4 Characters (e.g.,) 0.02 BSV.
  3. 5 Characters (e.g.,) 0.04 BSV.
  4. 6 Characters (e.g.,) 0.1 BSV.
  5. 7 Characters (e.g.,) 0.75 BSV1.
(Footnote 1: Turns out most 7 character combinations are pretty hard to generate and may take quite a while to generate. The prefix "1Bitcoin", however, is not as hard (higher chance of generating), and I can do that one for 0.25 BSV).
(Note: I can't guarantee that I can deliver anything longer than 7 characters, hence there is no price for this).
(Note: The reason for the steep increase in price as a function of number of prefix characters is the time it takes to generate the addresses as they become exponentially more complex and the fact the process is non deterministic).
Compare the above price for a 1Satoshi... address (0.75BSV) to (1BTC!!!) and hopefully you'll see that I'm being pretty reasonable with this, though do note that the "1Satoshi" prefix, specifically, is a hard one to generate and I may not be able to do it unless you are willing to wait a while.
Anyway, I'm not sure if anyone will be interested in this, and you'll have to trust me as someone who has been in this sub since the total membership was only in double digits, that I'm not a fly by night scammer who is going to take your payment and run! To that end I advise that I have made posts in this sub with direct reference to my Australian based registered business that accepts BSV as payment, so it's not hard to track me down. If you go back far enough you'll also see that I was involved in running a Bitstagram competition and came good with the BSV prize in that case. That said, a small amount of trust will be required if this is going to work out. Test me with one of the cheaper options first, if you have doubts.
Terms and Conditions
  1. Any PM received with an "order" is an offer by you to purchase a vanity address. It's not binding until I accept the offer in writing (by PM).
  2. All "orders" will be processed in the order they are received; I will guarantee a 48 hour turn around for everything up to 6 characters and 1681 hours (7 days) for 7 characters. In reality most will be processed much quicker, but I have to cover my ass! If I get too many orders (unlikely!!) I reserve the right to reject any that I cannot meet in a timely manner (any payments that have been made will be refunded to the specified address, less any BSV Tx fees).
  3. This offer is on the table until I withdraw it. I may withdraw it at any time by making a follow up post to this sub edit to this post.
  4. The address that is generated is the address that you get and that is final. If there is something in the address that you don't like (like a random swear word; albeit very unlikely) we can discuss a discounted rate to have a second try at it. (I'd rather you go home happy, if possible).
  5. If there is some address that I cannot generate in the above guaranteed time frames (some are harder to produce than others), I will let you know by PM and refund your entire purchase price.
  6. The entire risk of the use of the generated vanity address lies with you. (I recommend you test it with a small amount and make sure you can withdraw it, before loading it up for real).
(T&C Footnote 1: Some 7 character combinations can take a long time to find (e.g., "1Satoshi") and may take up to two weeks or more! I reserve the right to not even attempt to generate any specific combination that could adversely affect my ability to turn it around in a reasonably timely manner. In that case you can choose a different prefix or I will refund your money, if at that stage you had already paid). For any potential prefix I can check the estimated time to generate and report back on whether it's reasonable, before we agree to go ahead.)
ps/ Here are two three addresses that I generated showing that funds are able to be deposited and withdrawn successfully.
Both addresses accepted funds and both allowed the BSV to be successfully swept (in this case I used Simply Cash to deposit and sweep).
EDIT 2/21/2020. I am no longer offering the service described below as I no longer have access to the necessary hardware.
submitted by PaidSockPuppet to bitcoincashSV [link] [comments]

Proof of Keys - A guide

On January 3rd 2019 we'll be taking back control!
This is a guide aimed at newcomers or for anyone who has never had their bitcoin under their own control and wishes to stop relying on exchanges or other people keeping their BTC safe.
While it is in some ways safer to leave the security of your precious BTC up to the huge and more reputable companies in the space, having responsibility over your own money is a key principle in Bitcoin - for very good reason.
Not your keys? Not your bitcoin!
You might also be in a position where someone in your family takes care of your bitcoin for you, off exchange but still out of your control. This is the perfect time to become literate about how to store your BTC yourself and take some pressure off that person. What would happen if they were to pass away? If they have left a guide for you explaining what to do in the event of their death, what happens if someone were to find that guide while they are still alive? Conversely what if there is no guide and the coins are just gone forever?
This guide won't go in to high level solutions like Glacier Protocol, which are so extreme as to (in my opinion) actually do a disservice to the overall goal of getting people to keep their funds under their own control by being so intimidatingly, insanely over the top that people become discouraged. You can break free of the custodial norms of money without going to these levels and still be sleeping comfortably at night.
Finally, we're not trying to bank the unbanked, we're trying to unbank everybody!
With that said, let's go over some of the standard ways you can own bitcoin without third party help.
Hardware Wallets
Firstly, I will suggest a hardware wallet such as trezor or ledger.
There is still time to get one in time for the event should that be your aim, but I'd also like to stress that you should take as long as necessary to know exactly what you are doing before moving any bitcoin.
Should you choose this option, while not the best it is far from the worst and it is the route that I will be recommending in this guide.
When it arrives, check that it hasn't been messed with. Trezor packages come glued together with a seal that must be in tact. There are risks in using hardware wallets, but remember that there is no such thing as perfect security. The wallet will come with a fairly comprehensive guide but there are a few things to say here.
You will be tasked with writing down 24 words as a seed. Here is where the most caution will be needed.
Write down these words on a piece of paper away from anything with an exposed camera such as a cell phone or laptop webcam, away from any prying eyes or windows and even, for the paranoid, without leaving a mark on the surface underneath the paper that you are writing on.
Do not take a photo of these words. And never, ever, ever write them down on anything electronic. Use. Paper.
These words will be used by the hardware wallet to generate the private keys that ultimately need to be used to to tell the bitcoin network where you want the coins at the addresses they correspond to to go. - Sorry mouthful but that's literally the essence of how all this works.
So if you don't have these words and you lose access to your device, or forget the PIN (see further down) then you can't spend your coins - they're gone, or rather, they are stuck at the same address. Forever. Lost bitcoins don't disappear, they just stay at whatever address they were at.
If you do have these words then you can spend the coins. i.e They are yours. However so can anyone else who finds these words (unless you have a secret extra word which I will go into in just a moment).
In bitcoin, knowledge is possession. This is the truest form of intellectual property that has ever existed.
Once you have written down your 24 words, laminate them. (I can't find the link sadly, but I'll never forget the story of a drunk guy on taking his paper wallet out of a safe and spilling his drink on them making them unreadable. Don't be that guy).
Laminated? Definitely not exposed to any cameras, people or windows? Good. Find somewhere safe to store them. Ideally an actual fire-proof safe. But first, put it in an evidence bag. This adds additional security (admittedly not much, but IMO it's worth doing).
Now, once you have followed the instructions on your hardware wallet you should reach the point where it wants a pin. This pin is specific to the device and only protects the device - it does not have anything to do with the bitcoin on the device. It merely protects the device itself, so in the event that it gets stolen, the thief (providing he only has the device, not your 24 words) will not be able to do anything with it. However, if the attacker finds the device and pin, they have your coins they do not need your 24 words. So bare this in mind.
Having the device and the pin means you can spend the bitcoins on this device - even without the 24 words.
Device and nothing else? Useless. Pin and nothing else? Useless. Pin and device even without the 24 words? Control over your bitcoin. Just the 24 words and nothing else? Control over your bitcoin.
Secret extra words
You will be given the option to add a 25th word (or even 26th, can add as many as you would like.) This is not the same as a pin. This will cause different private keys to be generated. This is becoming standard practice as a thief will look for 24 words, but it changes the scope of any attack they would pull insisting on trying extra words and checking each wallet that gets generated for any bitcoin.
So standard practice is to generate a 24 word wallet, store a small amount of bitcoin in there, and then add an extra word where you store the bulk of your bitcoin. Then your thief will hopefully be satisfied that you aren't hiding a larger stash, or decide to cut their losses. If your 24 words generate an empty wallet that will likely signal to any bitcoin savvy thief that you have extra words up your sleeve.
Rather than describe all this in detail (as each hardware wallet works differently), I will ask the reader to get familiar with their device, set up a few wallets, transfer tiny amounts of bitcoin each time as a test, firstly with just 24 words, then a secret extra word. Get comfortable doing this and make sure you understand what you are doing at every step before moving your actual stash.
If you break/lose your device
Simple, buy a new one and enter your 24 words. Added an extra word? No problem, enter your 25 (or however many) words. It's as simple as that. If lost and not broken, someone who finds it won't be able to do anything if they don't have the pin. Typing wrong pins in after 32 attempts or so, they'll be waiting until the end of the universe until the device lets them try another guess. (That's how trezor works at least - doubling the time required between wrong password attempts each time).
Phone wallets
For those with a smaller amount that don't want to splash out on a hardware wallet, or just want to do this right away, phones are actually pretty decent security wise (I'd use a phone over a laptop as it's easy for laptops to become infected with malware such as Windows 10).
Download a wallet such as GreenAddress and follow the exact same protocol as above. It is exactly the same, except a hardware wallet gains the security of having less functionality than a phone - fewer things can go wrong (but they are more likely to be targeted in transit so....again - no such thing as perfect).
Got an old phone that you don't use any more? It's the perfect use for it. Remember, if it dies on you, you'll still have those 24 words and that's enough to retrieve your coins. (One thing worth mentioning is that secret extra words are not usually possible on phone wallets. They aren't designed for the kind of security that hardware wallets offer).
Additional security
Cutting up your 24 words and placing them in different locations doesn't do a lot to increase security while it does however massively increasing the chances that you yourself will become unable to access your own coins. Don't go overboard and end up losing everything.
Don't make a 500 character pin on your device - as mentioned above a few wrong attempts locks out any thief pretty much until the end of time.
Keeping your 24 words somewhere other than your primary residence might be a good idea, but another country? That's probably taking it too far.
Don't mention bitcoin on facebook. If you were going on about this 5 years ago, everyone there now knows whatever wealth that you had back then is now a few orders of magnitude greater. And that will continue to happen. Don't become a target.
You can use an airgapped laptop - not recommended if you don't know what you're doing.
You can generate a paper wallet using - no one does this anymore as far as I can tell, and I'm told by core devs that it is a horrible method, even if done offline using a dumb printer.
You can flip a coin 256 times - seriously not recommended unless you are just curious and want to really see under the hood.
That's pretty much it for this guide. I hope people will tear me to shreds in the comments, thus increasing the overall value of this post.
Happy bitcoining!
p.s one thing worth mentioning, "Proof of Keys" is a strange name if you ask me. In Bitcoin, you prove you own coins by signing a message. No one here needs to be doing that. All that January 3rd is about is you, without the aid of any third party, having the full and sole control over your coins.
p.p.s So much of this knowledge comes from Andreas Antonopolous. It has to be said. (when mastering LN btw?)
submitted by violencequalsbad to Bitcoin [link] [comments]

Summary: pitfalls of paper wallets

Pitfalls and solutions of paper wallets

Creating paper wallets:

Problematic action: Create a paper wallet on a paper wallet service website without disconnecting from the internet. Reason: It's extremely insecure for many reasons, some being 1) the website is hacked with generated private keys sent to the hacker; 2) there may be malware in the browser or in the operating system that sends the private keys to the hacker. Solution: The bottom line is to disconnect the internet before creating the paper wallet. It's not secure enough because 1) the malware can save the private keys and wait for internet connection to send them out; 2) the malware can interfere with the generation process itself and give you a private key that is already known to the hacker, which is called backdooring the random number generator; 3) the private keys may exist on the hard disk therefore may be extracted by malware or after the computer is disposed. Better solution: Download the paper wallet app from an online computer. Copy it to an offline computer via a flash drive. Run it from there. Best solution: Use a live operating system, such as a Linux live CD, to run the paper wallet app. This is not ultimately bullet-proof, especially for high-value targets, because there exist malware that can hide in the BIOS and firmware of your computer and can infect your live operating system. It should be secure enough for average Joes.
Problematic action: Create a paper wallet without serious verifications. Reason: There may be incompatible issues with operating systems and browsers. Solution: Run tests on various operating systems and various browsers before putting BTC in. Make sure the generated private keys are identical. This applies to regular paper wallets and BIP38 paper wallets. Make sure the decrypted BIP38 keys are correct.
Problematic action: Create a brain wallet created by or other brain wallets without key stretching. Reason: It has been proven insecure. Solution: Use WarpWallet or other brain wallets with key stretching, e.g., scrypt, bcrypt, sha512crypt, pbkdf2, and so on.

Printing paper wallets:

Problematic action: Use a wireless printer. Reason: It's insecure because wireless networks are insecure. Solution: Use a wired printer.
Problematic action: Use an advanced printer, which has internal storage, such as a hard drive. Reason: It is insecure because the private key of the paper wallet printed may be stored on the internal storage, therefore may be recovered if the printer is sold or scrapped. Solution: Use a dumb printer. Or keep the printer locked up and never sell or scrap it. Or smash the printer, including and especially the internal storage.
Problematic action: Leave the printer open for other people to access after printing without turning it off. Reason: It's insecure because the private key printed may still be in the memory of the printer. Solution: Turn the printer off after printing.
Problematic action: Leave the computer untreated after printing. Reason: It's insecure because the printer driver and/or operating system may be keeping copies of the documents you print in some sort of "spool" or print queue. Solution: Use a live operating system, such as a Linux live CD, to print.
Problematic action: Use a shared printer (at work or school, for example). Reason: It's insecure because 1) the printer may have a glitch and someone else may get your printouts; 2) the printing jobs may be centrally logged. Solution: Don't. Use your own printer.
Problematic action: Use a printer to print the private key or the QR code of the private key. Reason: See above. Solution 1: Don't use a printer for private key stuff. Hand-write the private key. Hand-draw the QR code if you and the helping checker are patient enough. Or ignore the QR code since hand-drawing the QR code of the private key may be too time-consuming. Double check. Then check it again, preferably on a different day. Get someone you trust to check it. Then get him/her to check it again, preferably on a different day. (Testing the private key in a wallet app can make it sure. But it comes with risks.) Solution 2: Don't use a printer for private key stuff. Use brain wallet. Write down the passphrase and the relevant information, e.g., the name of the tool used, e.g., WarpWallet, and the instructions. Store it the same way as a paper wallet. Save and store some copies of the tool, in case the future versions become incompatible. (There are pitfalls for creating man-made passphrases. It is beyond the scope of this post. In a nutshell, don't create the passphrase (solely) with your brain, and don't keep the passphrase (solely) with your brain.)

Spending from paper wallets:

Problematic action: Import a paper wallet private key into a wallet app, then spend directly from the paper wallet address.
Mistake: Expect the paper wallet automatically receives/holds changes, similar to a real-life wallet, which may not be the case. Reason: Early wallet apps didn't handle the changes correctly. The changes became the transaction fees of the miners. There is a misunderstanding of how Bitcoin works. There is no account balance of any kind in Bitcoin. There is only Unspent Transaction Outputs (UTXOs). The receiving addresses of changes, which will become the new UTXOs, must be specified when BTC is spent. Otherwise, the changes will automatically become the transaction fees. This depends on the implementation of the wallet app, which should not be trusted.
Mistake: Think nothing is wrong if changes are handled correctly. Reason: It's called address reuse, which is not recommended in Bitcoin because 1) it reduces anonymity of both the sender and all the consecutive receivers; 2) it reduces the security by exposing the public key, which is vulnerable to quantum computing. Addresses are hashes of public keys, which are safe from quantum computing.
Mistake: Destroy the paper wallet after it's imported into an HD wallet, thinking that it has become a part of the HD wallet and it's safe to destroy because the master seed of the HD has been backed up. Reason: It is not a part of the HD wallet. If the paper wallet (the paper) is destroyed and the app is uninstalled, the BTC is gone even if the HD wallet is recovered from its master seed.
The right way: Spend (transact) all BTC in a paper wallet to an address of your wallet app. It is called "sweeping", which is completely different from importing the private key. Spend BTC from there. After all the spending is finished, create a new paper wallet and transact all the remaining BTC to it. Store the new paper wallet. Keep the old one for future reference, or destroy it if you don't want the trace.

Destroying paper wallets:

Problematic action: Destroy a paper wallet after it is used. Reason: You may need to prove you had control of that address some day, e.g., for taxation purpose. In the case of a chain split, you may have a balance on the other chain. Solution: Don't ever destroy a paper wallet. Keep it on file. Mark it with the relevant information, e.g., "Used in April 2017". Unless you don't want to be tied to the address.

Pitfalls not specific to but more likely happen to paper wallets:

Problematic action: Google a famous wallet app, click the first link or the sponsored link, download/install it, and use it, without serious research. Reason: It's insecure because the wallet app may be a scam. Solution: Do thorough research prior to deciding which wallet app to use. Find the official site prior to downloading/installing it.
Additions and corrections are welcome.
Edit: multiple editing for additions, corrections, and clarifications.
Disclaimer: Although I set off to make this article in order to use paper wallet safely, I ended up not using it. Some of the solutions are collected from the internet. Some are my untested ideas. Use the article at your risk.
submitted by exab to Bitcoin [link] [comments]

I think based on watching this place that more people lose their bitcoin because of the extreme security measures they take that then lock them out than any other reason. You need to spread the risk of loss.

Get several paper wallets and hide them separately to divide your risk of losing it all. Put some of your bitcoin in some of those.
Or at least copy and paste some addresses and private keys in separate groups several different places .
Not all in one place.
I think based on watching this place that more people lose their bitcoin because of the extreme security measures they take that then lock them out than any other reason.
You need to spread the risk of loss.
Remember if you keep it all together you increase the risk of loss of all your bitcoin from one mistake or theft or accident.
If you keep all together in several copies in several places you increase the risk of discovery theft and total loss but decresse the risk of total loss from destruction of one cache.
If you keep several partial caches several places you make it virtually impossible to lose everything while possibly increasing the risk of loss of some.
As values are expected to continue to rise its crazy for most people to keep it all of their coin in one place.
Your little stash today may be worth a lot when bitcoin marketcap is the same as gold and one bitcoin equals $330,00.
Its also better to separate your stash now than when you have a lot of money on one old phone and are scared to touch it becuase it is worth so much.
Also when moving coin never ever send the whole amount to a firdttime address . Always send a test amount and ensure your private key for that new address works by moving some out. Then and only then send a large amount.
Also never do all your moving around at one sitting. Never do it rapidly ina formulaic routine way where you can make the same mistake 5 times before realizing you had the caps lock on or something.
Move some one day.
Then move some another day.
never move coins in a hurry or after drinking or in dim light or with low batteries.
Dont keep it all in paper wallets.
Keep some in a trezor maybe.
Maybe some in a passworded encrypted 7zp file full of other nonesense files in the cloud or on a sdcard. (dont have only one password protected file anywhere.)
Never use the word bitcoin or password or private key or wallet.dat in the file anywhere or in the file name.
The enemy of a hacker is 30 encrytped files fulll of fifty nonsense files and one good one all named soemthing normal. By the time they figure it out you can have moved your coins other addresses they dont have.
If a theft sees a trezor they know what it is.
Some people have engrsved encoded info such as altered privatekeys on stainless steel tags etc and buried them. That seems clevef as it protectsfrom fire but if found cant be used by others. You can engrsve pet tags st mostpet stores. Never used unaltered private keys because machines likely store everything they ever wrote like commercial copiers do.
Also remember to create a means for yourself to find your stuff if you lose your memory. Perhsos a reminder email in the future of a location or password clue.
Remember to make a will and somehow leave a method for those you care about to have access to your stuff but be very careful of relatives. It is unfair to give a relative a large temptation. A sealed note with a lawyer to be gicen at your will resding with a location clue that only the relative will know the meaning of might be a way. No i wouldnt give open adress private keys to a lawyer. Even if you trust the lawyer they could have a cleaning person thststeals it and no one coukd ever find out who got them.
Check your public addresses on the blockchain every once in a while to make sure you havent lost your bitcoin in anyof your caches... Especially before a large purchase.
Never throw away old phones or computers or copiers or printers that ever had substantial amounts of coin or all your addresses on them.burn the storage medium beyond recognition and recovery.
None of it matters with our little stash today until ten years from now when it has grown to a large value.
Its best to establish good practices now. The $200 partial coin you treat carelessly todsy will be the one you wish you had used several methods to divide and protect it in a few years when you have forgotten everything.
Edit: ( is a place to get some paper wallets. Choose bulk wallet and you'll get a list of public and matchedprivate addresses you can use that dont look as conspicuous.)
Also Old phones with wallets can have permanent battery failure. Many wont turn on even when plugged with bad batteries and some are hard to replace. .
submitted by azzazaz to Bitcoin [link] [comments]

Compressed, uncompresses bitcoin addresses and WIFs are different??

I am trying to play a bit with the Python ofek bit library and trying to find wallets using SHA256 (obviously in HEX format with 64 chars) derived from text strings and comparing to those displayed by Wallet Details. To find this just insert the SHA256 hash below on the Wallet details section and see yourself.
For example:
string: "1234"
SHA256: 03AC674216F3E15C761EE1A5E255F067953623C8B388B4459E13F978D7C846F4
Bitcoin address: 1B3PHXB6g5YGLvzTkxrrPEdLbpvfEoC5Qi
Bitcoin address compressed: 1F3c4AdEUxwWEo64k15LyftN8n7eZkckjU
Bitcoin Private key WIF: 5HquR1tdQaNC96gn5vfXvB7HHy5oWRzDfQiemarEiMifssZ2LwF
Bitcoin Private key WIF compressed: KwLrLzvsh4GYAk6Zzjs5ThciutYCGuHYtXgqhnQKXYSvb8b5YhTW
I thought the compressed variants were the same addresses just in a different format. But if you check both variants of the Bitcoin addresses on, they will point to different addresses apparently as one had transactions and the other didn't. Why is this?
Ofek's library (and other libraries I tried) get the compressed variants of the SHA256 value.
Anyone can explain why this is this way? Just imagine you send it to the wrong address thinking it's yours (even if both WIFs were generated from the same SHA256 value)
Thank you.
submitted by albertocastillo2001 to Bitcoin [link] [comments]

Why I support Bitcoin Classic

I'm the developer of I like to share my thoughts on the recent Fee Event. I have come to believe Bitcoin is more about people and our values than about code.
Bitcoin's vision in the whitepaper is explicitly about P2P cash. It wasn't labeled an interbank settlement system.
The original client was an all-in-one Windows application for your desktop PC. You could mine with your CPU. Send and receive payments with a wallet. Relay transactions and store the full blockchain.
We've drifted from the original optimistic and idealistic vision of Satoshi. The Genesis block made a statement about the banks and monetary policy by quoting a prominent newspaper headline in the financial center of the world, London. Satoshi's answer was cryptographic art through mimicking commodity money realized with networked code. We should bring our focus back to making that work.
The first critics said Bitcoin wouldn't scale. Satoshi continued responding that Moore's law is powerful and text is cheap to store. As more people joined the network there has always been need to optimize the code. Specialize the software repositories and binaries. Respond to the adapting changes in OS landscape. From retail users on smartphones to power users at data centers.
The protocol developers (or reference implementors), today known as Core/Classic developers, have always been able to respond and adapt. The community was smaller and the establishment in society wasn't paying attention. There were less parties interested in the possible, next step, direction of Bitcoin.
Other independently managed development teams have built special mining and wallet protocols. This is healthy for Bitcoin. Various groups of developers have specialized parts of the Bitcoin code system. These groups typically need to be communicated with and coordinated with to safely roll out an upgrade to the protocol. These groups are paying attention to the Fee Event.
As things have become specialized some things have moved in a positive direction for example how SPV wallets put monetary sovereignty in your pocket. Other things like mining pool centralization and custom hardware and data center scale efficiencies that are due to various pressures in the incentive system of mining have taken us further from the original vision in Satoshi's whitepaper and original client. We don't have the solution for that problem today but rest assured that people are thinking about it. One day, an altcoin might get mining, incentive-wise, to a place where CPU/GPU have some inherent advantage when coupled with the use of other hardware on a typical PC.
Bitcoin has longer term decentralization challenges. But today we are faced with a simple short term challenge with a common sense solution.
On the 29th of February 2016, the network became unreliable. Today, there is a short term solution running in production for miners and full nodes called Bitcoin Classic 0.11.2.
Smartphone wallet and web wallet users will not be affected and transactions will start getting confirmed in the normal 10 to 30 minutes. The tiny change it makes is upgrading the block size limit to 2MB with some additional safety code in place. Once 75% of miners have signaled they have upgraded a 28 day grace period begins and we will have a heck of a get out the word campaign to do!
All exchanges, mining pools, large private miners are paying attention. Not everyone who is running a full node is paying attention! When/If Bitcoin Classic activates they will receive a notice in their Bitcoin client that something is not right because blocks are not being found at the regular speed they've slowed down. This will be a message that you may need to upgrade. This has happened before and was effective in getting the long tail of users of full nodes to check the well known discussion sites for news of an event.
2MB means, to me, going from an estimated 10 million user community to a 20 million user community. Even more when medium term SegWit benefits are rolled out.
Bitcoin Classic 0.12 is coming out soon so you will have a best of both worlds. All the good stuff of 0.12 from the Core repository. With the Classic finishing touches.
When/if Classic activates the Core repo would necessarily need to pull the change set from Classic and begin again to work on the same protocol version. At this point either the development release teams merge or they compete for priorities of feature-sets and the market of miners, full nodes and wallets signal readiness for any upcoming protocol upgrade. The latter might be a robust development governance model for the future of Bitcoin.
Join me in upgrading to Bitcoin Classic.
submitted by pointbiz to btc [link] [comments]

Then they fight you, then you win!

Core supporters are willing now to join this sub and debate us. Let's find a renewed zeal to thoughtfully explain our arguments and dispel any FUD they received in the other sub.
Let's remember what winning is... one chain to rule them all. All the electricity pointed at SHA256 PoW must back one chain. If there is any fork the minority must be swiftly killed off via 51% maneuvers. A morally proper and responsible Nakamoto maneuver means Bitcoin rule changes need 80% hash power such that 25% can be used to 51% the minority chain (20%). The remaining 55% will keep the longest chain moving forward.
I purposely wrote the above paragraph agnostic of a particular Nakamoto ruleset. As Bitcoiners we must let the hashrate speak and accept its wisdom.
Many exchanges have made their position clear that one chain is the simplest path for them. And that if Bitcoin Unlimited prematurely forks (such that the core chain keeps progressing) they will be forced to relegate it to an altcoin (even if temporarily). That's a losing proposition for Bitcoin Unlimited. Patience should be with us Bitcoin Unlimited supporters. The higher the transaction fee goes the more core supporters will awake to our message.
I'm a big blocker and developer of I've been to a couple Satoshi Roundtables and discussed these issues with well known thoughtful core and blockstream folks. All who sincerely believe a code enforced limit is necessary to protect Bitcoins long-term viability. As well that a hard fork is a betrayal of Bitcoins value proposition of long-term store-of-value because Bitcoin being extremely difficult to hard fork is part of why they value Bitcoin.
At this moment the average Bitcoin power user and full node operators still believe in the Core roadmap, SegWit/LN. Now that those guys are here talking to us. Let's help them understand that people won't lock up money to use LN. Payment channels exist today and we don't see two party channel use in the market.
Let's have all those many discussions theymos wouldn't let us have. It's our time now as Bitcoiners. We need to talk about malleability, zero conf (Subchains), larger CONOP (node cost) and the big blocker belief that price increase will fuel a healthy subsidy for decades to come. That the 10 minute average block interval sets a limit to the physical limits for transaction throughput. As well miners will carefully ensuring in their own self interest to pay their costs and make sure their blocks get buried 100 deep in the chain they will set a reasonable but ever growing cap on the block size that maintains fee pressure. Slowly but surely pricing out Androids and Raspberry Pis from being a full node.
submitted by pointbiz to btc [link] [comments]

Here are Security Tips to Generate Cold Storage Securely

Security is a spectrum.
The amount of effort, cost, and paranoia dedicated to generating cold storage should be proportional to the value being protected and its significance to the holder both now and potentially in the future.
To avoid loss of funds, here are some tips to generate cold storage as securely as possible:
submitted by cryptostorage to Bitcoin [link] [comments]

Here are Security Tips to Generate Cold Storage Securely

Security is a spectrum.
The amount of effort, cost, and paranoia dedicated to generating cold storage should be proportional to the value being protected and its significance to the holder both now and in the future.
Here are some tips to generate cold storage as securely as possible:
submitted by cryptostorage to btc [link] [comments]

A Step-by-Step Guide to Creating an Anonymous Wallet for Covert Practices

A Step-by-Step Guide to Creating an Anonymous Wallet for Covert Practices
With the recent Bitcoin “bubble” fiasco and the subsequent rise and fall of Bitcoin value, it seems that this subreddit has become obsessed with making money. But get-rich-quick schemes are not at the heart of Bitcoin. Instead BTC should be seen as a way to keep Big Governments and Big Businesses from knowing how much money you have and what you choose to spend that money on. As a currency, it doesn't matter how much the value fluctuates if you plan on spending your wealth on sites like the Silk Road and etc.
(OK, maybe it does matter a little bit if the money you spent yesterday is worth twice as much today; but this guide is for spenders, not hoarders. Or at least for hoarders who also like to spend.)
Let's discuss my favorite attribute of the Bitcoin protocol: anonymity.
Many noobs getting into the Bitcoin game fail to realize that anonymity is an important key to understanding the importance of Bitcoin. In places where your wealth can easily be taking away from you (see Cyprus, Russia, China, the USA and others), Bitcoin can function like a store of cash buried in a dessert in the middle of nowhere – buried so deep that nobody can find it, not even the most powerful men and women on Earth.
POINT: If you are purchasing your Bitcoins through services like Coinbase or Mt. Gox, and if you've ever given your real name and bank account information to a Bitcoin Exchange, then you are NOT anonymous. Your Bitcoins can be traced back to you. Your purchases are recorded in the blockchain, and although it's difficult, it's certainly not impossible for those with the knowhow to find you and prosecute you. See this link before continuing.
Bitcoin is not inherently anonymous. You must take steps to protect yourself in order to keep your identity a secret. And even still, if you don't know what you are doing, you run the risk of being caught. So if you care about hiding yourself and your money, I offer this guide as a way to accomplish secret purchases and covert trades. Of course I cannot guarantee you won't end up in jail. At the end of the day, nobody knows how closely governments are tracking BTC purchases over the TOR network. Some people even believe that the TOR network was created by nefarious forces. I doubt it, but you never really know.
STEP ONE: Anonymous Hardware
Because you cannot really know whether or not you are being watched, your first step in creating an anonymous wallet is to protect yourself by buying a cheap laptop computer and removing the hard-drive. Really, who needs a hard-drive anyway? Toss it in the garbage.
STEP TWO: Anonymous Software
If you don't know how to download a Linux LiveCD, then stop reading now. You are probably not skilled enough to protect yourself anyway. If you don't know how to download a Linux LiveCD, then proceed with extreme caution; downloading an ISO file and burning it to a DVD is pretty damned easy. Easier than anonymity. Those who refuse to learn are at risk.
It's arguable which software you should use, but I recommend connecting to the TOR network using TAILS, a live DVD or live USB that aims at preserving your privacy and anonymity. TAILS helps you to use the Internet anonymously, leave no trace on the computer you're using, and to use state-of-the-art cryptographic tools to encrypt your files, email and instant messaging.
ProTip: For an extra layer of protection, download the ISO from your local library's computer. Or while you're sipping a mocha at Starbuck's. Then burn it to a DVD and take it home. Place it in your crap computer (the one without a hard-drive) and turn it on. Enter the BIOS menu and boot from CD if your computer doesn't do it automatically.
I repeat, for an extra layer of security, DO NOT CONNECT TO YOUR HOME WIFI USING TAILS IF YOU WANT TO DO SHADY THINGS. That's just common sense. TAILS itself isn't illegal. But if you're the type to do shady things, you don't want to practice on your home Wifi, which you probably pay for with a bank account or credit card.
After you've spent a day or two using TAILS and familiarizing yourself with the LinuxOS, and once you feel comfortable enough to continue, then head back to your local Starbucks, boot up the LiveCD, and connect. Browse the TOR network and triple-check that you are protected. You can do this by checking your IP address for DNS LEAKS. Only if you feel comfortably hidden from prying eyes will you want to continue.
STEP THREE: Creating an Anonymous Wallet
There are several different ways to to this, but the easiest way is to use the code at Thanks to SpenserHanson for creating this thread which describes the process in detail:
  1. Save to your computer
  2. Close browser.
  3. Disable computer Wi-Fi.
  4. Open in browser.
  5. Generate an address and record the private keys.
  6. Close the browser window.
  7. Go home. Think about what you are about to do.
STEP FOUR: Funding the Anonymous Wallet
Funding your wallet will be the most difficult part of this process. Obviously you don't want to go to a site like Coinbase or Mt. Gox and link up you bank account, then start sending coins to your anonymous address. That would be stupid. Very stupid.
Probably the best way to get coins is to know someone who is willing to send you a few, but even then you lead a trail back to your friend.
My suggestion is to make cash deposits through ZipZap or Bitinstant, and give them false information (for example, use the new email you created, over the TOR network, from a site like Hotmail or Yahoo, which doesn't require a phone number to sign up – I'm looking at you Gmail. Make sure your new account forwards your email to yet another account, perhaps Tormail or a temp address. You probably won't need to use the email more than once anyway, for confirmation, if you need it. And you might want to create a new address with every deposit, just to be safe). There are other options of course. Some companies will sell you Bitcoins anonymously through Bank of America cash deposits. But remember that the moment you walk into a Big Bank and give them money, you are caught on camera. Maybe offer a homeless man some money to make the deposit for you. And hope he doesn't just pocket your money. Regardless, you want to stay away from Big Banks if you can. It really isn't that hard.
If you absolutely must make deposits from your bank account, you could send your coins to an anonymous online wallet first and then to cold storage, but make sure to use several mixing services over a period of several days. And then have trouble sleeping at night.
Another great idea is to use the localbitcoins website; meet with a seller locally; pay cash and GTFO.
STEP FOUR: Spending from the Anonymous Wallet
If you are looking to CASH OUT, there aren't many anonymous options besides meeting with somebody and selling face to face. You could always sign up for your own account at localbitcoins, then hope a buyer contacts you. But this guide isn't about making money, it's about spending your coins.
To buy things, you'll want to go to back to the library, connect through TAILS, download a lite client like Electrum and access your account. Every time you want to spend, you will have to re-download, but it should not take more than a few minutes. And though you are probably safe enough to spend directly from the client, if you really want to be safe you should send the funds to a second wallet though a mixing service, then to a third or fourth or fifth wallet, also through mixing services. These “Mixing Wallets” should NOT be created using the TOR network because the TOR exit node may be monitored. I've never had a problem myself, but it's theoretically possible that an attacker could record the password/private keys for the hosted wallet and steal your coins. Which is why you should NEVER USE THE SAME ACCOUNT TWICE. And never access your cold storage wallet through the net. That would be very very bad.
To created the mixing wallets you will also need a way to hide your identify without using TOR. The best way to do this is to sign up for a VPN service though a public WiFi hotspot and then pay in Bitcoin. The best service I have found is called Private Internet Access. You can access their service through a public computer, connect to the VPN, and voila, you now can safely create mixing wallets without exposing your password to the open network. Make sure that after you mix the coins you send them all to a safe, final address, which will be your Spending Wallet.
Remaining anonymous will cost your some time and money. With each transaction you're going to have to pay for mixing, and also the transaction fee. And setting up a new email and a new account with every transaction (so that you can spread the coins across multiple fake accounts) will be bothersome but worth it in the long run. You can't put a price on piece of mind when it comes to your safety.
REMEMBER Your Spending Wallet should not contain all of your funds. The bulk of your coins should be address you created using bitaddress. Never trust an online service to hold the bulk of your funds. The recent hacks have shown that the best place to store your private key is in your head.
Final Notes:
The Bitcoin protocol itself is not anonymous. And theoretically it's possible to trace every transaction back to you. This is why you need to use fake emails, many multiple addresses, and a VPN service with heavy encryption. Even with the knowledge and the technology to map the blockchain, the FEDS will have a hell of a time tracking multiple address though VPN tunneling back to a cold storage wallet that you created offline and only use to send coins over TOR. There are just too many roadblocks. Of course nothing is impossible. But I sleep very good at night knowing that my door is not going to be kicked in by the Men in Black. And even if you're not doing anything illegal, this sort of behavior is certainly suspicious.
If you were lucky enough to receive a tip from Reddit's own bitcoinbillionaire (I myself was not) and you haven't cashed out. Create a VPN-tunneled throwaway account and tip yourself before claiming your coins. Then send them through a mixing service and to your cold storage address. Now you're on your way to being an anonymous spender.
I hope this guide helps. I really do. The purpose of Bitcoin isn't to make money. It's to protect the money that you already have, and to protect your identity in places where your identity is compromised. Everybody in the world wants your money, especially the richest of the rich. You ought to do everything you can to keep yourself safe. Especially if you live in a compromised geography.
TL;DR: Go directly to jail. Do not pass Go. Do not collect $200.
EDIT: Some typos.
submitted by anon_spender to Bitcoin [link] [comments]

Bitcoin as a long-term investment - Best way to buy and store? Did I get that right?

Hi, I'm pretty new to this but just for the sake of not regretting it in a few years, I want to buy a small amount of bitcoins (maybe just 200 - 300 EUR).
Do you think this is worth the effort? I mean, even in the best case, where will BTC go? Double the value in 5 years or anything like that?
Anyway, I'm just wondering if I got everything right:
1.) I buy BTC at coinbase (I'm from Germany)
2.) I generate a paper wallet at
3.) I transfer my BTC to the "share"-key
4.) I print the "share" and the "secret" key and keep them at a secure place
5.) In 5 years my BTC's hopefully increased its value so that I can send them back to any marketplace via my "secret" key and trade them to get real money back
Is that correct? Thank you very much.
submitted by zlep to Bitcoin [link] [comments]

My Heir Wallet. Any suggestions?

My Heir Wallet
I decided I needed something slightly different than a paper wallet or a brain wallet. I am calling it an Heir Wallet. The idea is to have an offline wallet to store Bitcoins, with a private key that is defined by a hash of some answers that are commonly known by my heirs. My spouse and children should know the answers to all of the clues. Others will likely know the answers, if they combine efforts. Worst case, if they know most of the answers, a brute force attempt can be made to recover the bitcoins.
My Heir Wallet can appear in plain sight in my house, in multiple locations, with little risk of someone stealing my wealth. (I still will protect it as I would my checkbook or credit cards in the traditional banking system, but it’s nice to know that my heirs will be able to access the bitcoins when I am gone.) For the benefit of this subreddit, I have created an illustrative example (fake), so you can see how this might work:
To my survivors:
I have stored some of my assets in the form of Bitcoin, which is a virtual currency. These instructions contains the information necessary to retrieve the bitcoins located at this address 14koNnJrrUWmDLPeAjVQYv2bA22szm63fM . To estimate the value of these bitcoins, you can view the current balance at , and you can see the current value of a single Bitcoin at or a number of other sites online. [These links are accurate as of March 2013.]
To gain access to the above Bitcoin Address, you must possess the "Private Key". If you can answer the following questions, then you have access to the private key. The Private Key is a "hash" of a pass phrase, which is defined below. To determine the Private Key, go to and use their Brain Wallet feature. Use the Algorithm SHA256(passphrase), with the passphrase that is defined using the clues below. [These instructions are accurate as of March 2013.]
The Pass Phrase is 100 characters, made up of the answers to the ten questions listed below. Each answer is ten characters long. If the answer is longer than ten characters, truncate it at ten characters. If it is shorter than ten characters, then pad it with the following characters until it is ten characters long: *^^$!!$#^
Example: If the answer to a clue is “Apple”, then pad it with 5 extra characters, making the answer “Apple*^^$!”. Note that capitalization, punctuation, and spacing are all critically important.
Once you know all of the answers, key in the passphrase into's "Brain Wallet" feature, and the above Bitcoin Address should be displayed, along with the correct Private Key. Import that Private Key into a service that allows you to import it, and then you can spend the Bitcoins, exchange them for Dollars, or distribute them to others. Currently, several services allow you to import private keys, including,,, and various bitcoin clients.
Here are the clues. Note that capitalization is important in all answers (as defined by normal rules of English), but I remind you in the first few clues.
  1. What nickname did my college roommates call me? (capitalize the first letter)
  2. What first name did we give our baby that was stillborn? (capitalize the first letter)
  3. What middle name did we give our baby that was stillborn? (capitalize the first letter)
  4. Someone from my childhood got extreme cases of poison ivy. What was his/her first name? (capitalize the first letter)
  5. What company did I work at, for six years from high school through college? (Formal name)
  6. Last name of my extremely tall, good friend who I went to high school with.
  7. Last name of the friends that we go on cruises with (2000-2013).
  8. College that I got my undergraduate degree from. (Just the first word; leave off University / College, etc.)
  9. Street I grew up on (include “Rd.”, “Ave.”, “Cir.” Etc., and put a space between the street name and the “Rd.” part)
  10. Name of the company that I started my professional career with, out of college, and worked at for 15 years. (2 words, dash between)
Remember, each answer is ten characters, so the total passphrase is 100 characters long.

My wife and children all were able to pass this test (on paper) to answer these questions. My wallet was created offline, and the money resides in the derived Bitcoin Address, which is different from my sample, above). These instructions are in several places in my house and away from my house (and also in my email).
I hope someone benefits from this. Any suggestions on how to make it better?
Edit: fixed formatting of the carat.
submitted by 17chk4u to Bitcoin [link] [comments]

I'm giving out some Bitcoin paper wallets as Christmas gifts this year. This is the letter I'm enclosing. You can use it yourself if you like. How can I make it better?

I thought it would be cool to give out some Bitcoins for Christmas this year. I used the paper wallet generator which now includes nice graphics that make it look more like money. I printed them out, loaded some BTC on each, wrote in the amount, and laminated each one.
Here's the letter I'm enclosing with each gift to explain what it is. I wanted a personal way of explaining what Bitcoin is, how it's useful, and how they could actually use the coins stored on the card. I'd appreciate any comments you have on how to improve it. If you'd like to use or adapt this for your own purposes, please do. Here's the google docs formatted letter better suited for printing and basing your own letter off of, but here's the text for the lazy:
December 11th 2012 This gift to you is meant to show you something that I think is interesting and worthwhile. It’s something that I have been devoting a lot of time to recently, and I wanted to share it with you. Inside this envelope is a card that holds Bitcoins. Bitcoins are a type of money that can be freely sent over the internet to anyone in the world, in any amount big or small, without any middleman (peer-to-peer). Unlike US Dollars, whose value is diminished by the government printing more dollars every day, Bitcoins are created at a predictable and known rate by individuals all over the world. It is impossible to make a counterfeit Bitcoin and there will only be a finite number ever created. No one person controls Bitcoin and therefore no one can control what you do with Bitcoin. All of these qualities add up to make Bitcoin a solid platform for both saving and spending money. Bitcoin is new, and like any investment, it comes with its own risks. A year ago, one Bitcoin was worth about $4. The value of one Bitcoin today is worth $13.63 with the total market capitalization of all Bitcoins just over $140 million. But Bitcoin is still in its infancy, and as more and more people hear about it and acquire Bitcoin, the value of it will likely rise. You can see the realtime value of your Bitcoins at - the number in the top right is the current value in US Dollars, that is the price that people are actively buying Bitcoins for right now on an exchange market. What can you do with Bitcoins? * You can send them to people. * You can setup an online ‘wallet’ at and send them to anyone in the world for free. To use the Bitcoins on the card, login to your new account and click on Import/Export. If you have a webcam, click Import Using Paper Wallet and hold the QR code on the right hand side of the card to the camera (the code that says Spend) If you don’t have a webcam, enter the long Private Key text into the Import Private Key text box instead. You can then go to the Send Money tab to send someone your Bitcoins. * You can buy things. * - is like Ebay, but you use Bitcoins instead of Paypal. * - sells a lot of electronics. * - sells gift cards, so you can use Bitcoins to make purchases, albeit indirectly. * - Sometime soon there will be a Bitcoin debit card, so you can buy anything with Bitcoins. * You can hold onto them as an investment. * Just put this card away somewhere safe, and in a few years time you may be surprised at the value that your Bitcoins accrue. * You can convert them back to US Dollars at anytime. and are two popular sites that allow you to buy and sell Bitcoins and withdraw or deposit US dollars back into your bank account. If you’d like to know even more, you can go to or and read some more. Merry Christmas, Ryan McGuire 
submitted by EnigmaCurry to Bitcoin [link] [comments]

Newbie question about paper wallet encryption

Hello Reddit ! I want to safely store my bitcoins using a paper wallet. The method I chose is to create a BIP38 encrypted wallet (using with a strong password on an offline computer with Ubuntu booted from a CD.
I was able to do all this. I sent a small amount if bitcoins to the wallet then imported the private key. Everything worked well.
So, maybe I am a little paranoiac, but I don't like the idea of having only paper copies. What I would like to do, is to print a .pdf of my paper wallet, encrypt the .pdf file and upload it on dropbox. That way, I would have an encrypted private key, in an encrypted pdf document (with 2 different passwords) accessible from everywhere in the world. I think that by doing this, the paranoiac side of me would be in peace !
So here is my question. Do you guys know a safe way to encrypt a .pdf file ? I would prefer a free software, but considering the rising value of bitcoins, I am willing to pay for a reliable software too.
Thanks !
submitted by Space_People to Bitcoin [link] [comments]

Tips to Store Cryptocurrency Securely

Security is a spectrum. The amount of effort, cost, and paranoia dedicated to storing cryptocurrency should be proportional to the value being protected and its significance to the holder.
To avoid loss of funds, here are some tips to generate cold storage as securely as possible:
submitted by cryptostorage to cryptostorage [link] [comments]

Bitcoin and Bitcoin Cash in the same paper wallet

Hey everyone, For an Xmas present I am getting a family member bitcoin and bitcoin cash (same USD value). I just made them a paper wallet using bitaddress. Can I put both coins on the same paper wallet?
submitted by 12manyNs to btc [link] [comments]

Paper Wallets

Paper Wallets
One of the most exciting things you can do with your bitcoins is to send them to a piece of paper. It sounds sort of mundane but think about it for a while. Before bitcoin you, the average citizen, couldn’t do this. Sure you could create a painting, write a book or compose a symphony and sell it but you couldn’t just take the fruits of your labor and funnel them into a QR-code. Now you can. The implications of this are huge. Hiding money under your mattress is actually a viable alternative to a bank vault now because inflation or regulation won’t suck the value out of it anymore. So how do you do it? First of all, the first rule of crypto-club is: Your keys — Your bitcoin, Not your keys — Not your bitcoin. What you need to do to assure that you’re the one in control of your private keys is to follow these simple steps. Create a bitcoin address with a public and a private key offline Print these keys offline Erase any trace of the private key offline Send bitcoin to this newly created address There are many ways of creating your own keys but arguably one of the best is to use an open source based web service such as Open source software can be trusted because anyone can review the code. You don’t have to know what every part of the code does because you can trust that someone does. The same thing is true for your web browser as well. Download and install an open source web browser you don’t normally use such as Go to Go offline Create an address by moving your mouse around Print a paper wallet offline. Make sure your printer is offline too or, if you’re really paranoid, write the keys down manually Erase your browser’s cache memory. This is where all the information about the website you just visited is stored temporarily, including that very secret key you just created. You can do this in from your settings menu in Firefox. Uninstall the browser and erase all files associated with it It’s essential that you understand what each steps does and why you can trust each step of the process. There are even more bullet proof steps if you’re into conspiracy theories such as buying a dedicated computer and printer just for this purpose and running them over with a steamroller before you go online again but the method above should suffice if you know what you’re doing. The website can create three different addresses for you from the same seed and you can easily check if they work by sending a small amount of bitcoin to one of them to see if they work as intended. After you’ve completed the steps above, scan the public key with the QR-code reader in your bitcoin wallet on your phone. Make sure that your phone camera does not see the private key! Again, if you’re paranoid, just type the public key into your wallet. Most bitcoin wallets can do this. Go online again and send bitcoin to this address. This address is now worth exactly what you sent to it in bitcoin. This in turn means that you just assigned a specific value to the paper. As long as the paper isn’t compromised you own whatever amount you just sent to it. For example, if you made a paper wallet worth a 1000 US dollars on the 1st of February 2017 it would have 1 bitcoin assigned to it. Change the date to the 1st of January 2011 and you would have had 3333 bitcoins assigned to it. Good luck!
submitted by hitno00 to Bitcoin [link] [comments]

Paranoia and wallet security. Any thoughts about's RNG?

I have an online wallet with 2FA. Problem is, as the price of bitcoin goes higher and higher, the value of my stash has crossed my level of "don't care what happens to it". I'm really anxious about the coins now and I only access my wallet from my home PC.
I'm thinking of moving all my coins to cold storage and bitaddress seems to be the best bet. However, it seems to use ARC4 for random number generation, which has had some issues. I would have loved it if it used a crypto-safe RNG. The idea is to print the BIP38 encrypted paper wallets and move my coins to them and have a watch-only address list in my wallet. (Yes, I'll keep a coin or two for day-to-day stuff in a warm address)
Any thoughts on alternatives to generate cold storage wallets?
submitted by no_face to Bitcoin [link] [comments]

I want to consolidate my tiny amount of BTC and need some advice.

Back in the day when the Bitcoin crashed, I thought it was all over so I went ahead and used it all on SatoshiDice. I see that was a huge mistake as it is no longer worth mining without specialized hardware and Bitcoins are trading at a record high. I would like to consolidate my now pauper sum of 0.00225552 onto paper form using the paper wallet, but my Bitcoin client is Bitcoin-QT and it refuses to transfer the sum to an address without a fee of 0.01 BTC. What can I do?
Edit for more information: When I splurged on SatoshiDice my wallet became fragmented with addresses so I have about a dozen addresses that makes up the total 0.00225552 BTC wallet. I can't figure out a way to consolidate the total sum to one address in order to send it to a Paper Wallet.
Edit2: Managed to import all my addresses into but I can't send it anywhere as I am getting an error of "Insufficient funds. Value Needed 0.00325552 BTC. Available amount 0.00225552 BTC". Even though I put the Miners Fee to Zero it still wants a cut.
submitted by SonOfJaak to Bitcoin [link] [comments]

What is the best way to help the homeless with bitcoin?

Every time I see an apparently homeless person, I imagine that they could be much better off with a bitcoin QR code.
I need a resource that I can hand to them easily so that they can profit from bitcoin.
I thought I'd make a kit by: 1. Printing a few paper wallets 2. List a few resources a person might need to get started like for selling bitcoins received,, for printing new wallets. 3. Including a glyph cloaked email address they can write to me for help if they need it.
There are a few points of failure that concern me, and that's why I'm writing this.
  1. If someone takes their picture and replaces the QR code, they could effectively have money stolen.
  2. They would need to waterproof their QR codes.
  3. They would need to safeguard their paper wallets against theft. (Perhaps a quick course on security when working with library computers?)
There are many more, I'm sure.
I'm hoping you bitcoin will be able to help me create a proper beginners kit so that we can start directly benefitting those in need. I have a feeling this will be a huge year for bitcoin, so anything they can save will have increased in value by the end of the year.
submitted by collapsing_effigy to Bitcoin [link] [comments]

Brain/Paper Wallet

Alright folks.
I know this isn't a "OMG THE PRICE JUST HIT ____" post, but try to stay with me anyway.
Seeing more and more people lose there bitcoins, along with my bitcoins substantially growing in value, I would really like to switch to putting most of my bitcoins in a Brain wallet. (I currently store them using electrum)
I suppose my question is.. Is it really as simple as what I am understanding it to be. I go to say,, hit brain wallet, type in a lengthy, complicated passphrase, and it generates a public and private address for me. All I need to do is simply write down, or print off both the public, and private key (and I suppose my passphrase used to generate private key as well?) and I'm good to go? Just send them all to said public address and keep printout of keys in a safe?
So I suppose what I am asking is if this is indeed a safe way to set it up, and if there are any other issues that I am not seeing.
submitted by Bronc27 to Bitcoin [link] [comments]

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Bitaddress with Balance, Bitcoin Address Generator with Balance

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