Topic: . - page 2. (Read 89871 times)

farnell / element14 will get you them inside a week
rs / allied will get you them in 2 months [not sure may be longer] they fucked up the ordering of the SOC and have a massive backlog to get though
it looks like there will have been >1mil units sold before long [well before Christmas]


N.B.
there are only 44 processors on the GPU so even if we got hold of very low level stuff I doubt that they would be cost efficient to run as miners  however .... you never know

I bought my RPI just for this purpose and it's wonderful for this. You can even print paper bills like the kind you can find at http://print.printcoins.com but it takes a little while to generate the PDFs. My setup is completely offline. I have no block chain there, just wallet and wallet related tools. I have 1 SD card for this task and a couple more SD cards for using the RPI as a media center.

Vanitygen works on the RPI too. (oclvanitygen does not)

The block chain might be the only tricky part.

I got my RPI from element14 3 days after I ordered it. I think I just got incredibly lucky cause they just happened to have 100 in stock the day I ordered. I hear most people are waiting 12 weeks (OMG).

Worth the wait, this is the funnest little hack-box ever.

Just in case you didn't spot it in the newbie thread I posted my build of Armory for Raspbian here.
https://bitcointalksearch.org/topic/introduction-and-raspberry-pi-110107

Everything works for me. RPi is perfect for cold storage.

You're absolutely right. And at a price of only $25 it would be perfect. For that matter, with that specific Edimax Wireless USB there's even more pressure for a Raspberry Pi model A right now. I really hope they just get them done so we can use them.

For posterity's sake, I ended up using the bounty I was going to give for another project, but I still threw some coin to FiloSottile, I would highly encourage anyone else to give him your .1 BTC just to say thanks. I'm really looking forward to seeing what more can be done with this, it's the ultimate in air-gap security with Bitcoin, we should honestly be ranting and raving about it more. Also, don't forget to donate another .1 BTC for Armory development. If enough of us give a little to these guys, it encourages further development.

Where do I buy an stirling engine that provides enough power for a raspberry?

I found only educational models with enough power only for 4 leds.

Thanks.

So tell me.  After reading this wired article, is there someone here who considers actually buying Legos and Raspberry pis to build a giant lego bitcoin miner wall?

That would be so cool...

It's a learning tool. They're probably not running it much except to demonstrate how a super computer works.

Plus, raspberry pis don't get too hot. It's just a wee one.

I linked to this earlier today in my What I Leant Today thread. https://bitcointalksearch.org/topic/m.1191390

~Bruno~

So that was you...   

Wanna Build a Supercomputer? You’ll Need Legos and Raspberry Pis…

cool, i guess... but isn't this just the same as saying "i got bitcoin working on linux"

https://i.imgur.com/IaAHAl.jpg


Here I am, RPi is now your answer!
https://gist.github.com/3646033


I'll leave this here 18p7pUqqxPYtDaK3GytdVxdSKZzs25SihS

I bet if you set up hidden Raspberry Pies in places like cyber cafes and on the outside of network firewalls man-in-the-middle style, you could have a distributed darknet that would be impossible to trace, then operate all the major bitcoin functions on that.

Thanks for the very informative post.  The "alpha" status is why I have not tried Armory yet - but I will now.  Thanks.

Sorry to keep harping on this but this is exactly why I made Armory.  As far as I know, there is just no simpler, safer way to use offline wallets than using Armory.   I use a 10-year-old laptop for the offline wallets, but the Raspberry Pi is the perfect compliment to Armory:

Setup offline wallet:
(1) Generate Armory wallet on offline machine (Raspberry Pi)
(1a) Print off a paper-backup of the wallet:  all coins can be recovered any time in the future with the 64-bytes on one sheet of paper (not encrypted)
(2) Click "Create Watching-Only Copy", import to online computer (no private keys)
(3) Online computer can now generate infinite number of payment addresses and monitor incoming transactions/payments
(4) Online computer only has public keys, wallet cannot be compromised.

Even if other solutions/methods succeed in the above, nothing is easier than Armory for spending those coins:
(1) With the watching-only wallet, click "Prepare Offline Transaction"
(2) Fill out transaction exactly as you would with a regular wallet.  It will ask you to save it to a USB key.
(3) Take USB to offline computer and go to "Sign Offline Transactions"
(4) Review transaction, sign it, it will add the signature(s) to the transaction on the USB key
(5) Take back to online computer and broadcast

You can generate infinite addresses/public keys, and monitor incoming transactions just as you would a full wallet.  And it takes less than 60 seconds to execute a transaction (once you have some practice).  Quite a bargain for the peace of mind that your private keys have never been near an internet connection.  Also, the wallets are encrypted using AES and scrypt-based key-strengthening.  And your single paper-backup protects you for forever (minus imported private keys).

Armory is technically still in alpha, but it's due to setup and usability concerns, not security or stability.  In the 8 months since Armory has been public, and with 1,500 downloads per month, still no reports of anyone ever losing money with it.  Some users have reported using Armory with 10K+ BTC.  It will be beta soon, but most users treat is as beta+ already.   (P.S. - of course Armory is OSS and comes with the usual "I am not liable for anything" clauses, I'm just commenting on its track record)

The point of this story:
(1) If you want cold storage, look into Armory
(2) If you want cold storage, but don't want to deal with laptops, RaspberryPi will soon be your answer
(3) Someone will soon be posting instructions for using it on RPi

I'd be afraid of malware on my phone grabbing the QR codes and thus, stealing my keys.  I'd rather use a simple non-network camera if I was going to take photos of QR codes.  But then, how can you be sure of making backup copies of those without malware stealing those photos?

Here's how I use my Raspberry Pi to generate cold storage wallets.  Start with a freshly formatted SD card, install the Raspbian image to it and copy the bitaddress.org .html file to the partition visible from Windows.  (For the REALLY paranoid, create your own linux image for Rasp-Pi and examine the bitaddress.org .html code for malware.)  Make sure the ethernet cord is NOT plugged in the Rasp-Pi and boot up then configure the keyboard, timezone, etc.  

Start the browser and generate a single new paper wallet key with the bitaddress.org file.  WARNING: Generating a new key takes many seconds on the Rasp-Pi - be patient!  Print the resulting image to a .pdf or .ps file.  (This saves the QR codes for future use.)  Also copy/paste the address and key into a text file.  Save in plain text.  (See note below.)  Also create another similar text file with ONLY the public addresses.  Repeat for as many addresses as you want.

Now, using a spare USB port, copy just the public-address-ONLY files to a USB drive.  Use this in your PC to move money into your wallet.  (Do NOT put the private keys on this USB drive.)  On two or more DIFFERENT USB drives, back up the private key text files, and the files that you "printed" using the browser window.  Instead of USB drives, I use the 16 and 32 MB (not GB) SD cards that come free with digital cameras (w/ a USB adapter).  Store the linux boot SD card and private keys in a bank safety deposit box or home safe - or anywhere you would store a kilogram of gold.  

When you need a private key - use ONLY the Rasp-Pi (when NOT on the network) to copy the ONE private key you need to your "public" USB drive.  Remember to NEVER insert the private key drives in a computer that is on the network.  Assume ANY computer or device (phone) that has ever touched the internet has malware.

Call me paranoid if you want.  But I intend (HOPE!) to never get bitcoins stolen.


NOTE: I prefer to save these keys in plain text because if I die or get a serious brain injury, I want my family to be able to get the coins instead of burying them with my "brain wallet" or secret password.

Tip jar:  1G7KWeWNHNvhfV6m6a7JGss5YGSYeFr8Ci

I've been thinking for some time that the Model A (currently not available, it has 1 USB port and no ethernet) would be a rather good solution for those looking to run a cold storage wallet

Someone just contacted me to let me know he got Armory running offline on the Raspberry Pi.  He emailed to ask if I can get him off the newbie list so he can post:

https://github.com/etotheipi/BitcoinArmory/issues/19

If you can get ahold of him, see if you can get him to post here, then give him the bounty





Steve, you should really look into Armory.  You can do everything you just requested with it, except for the encrypted QR-code thing.  But if you're going to backup the encrypted version online, you might as well just make a copy of the encrypted wallet.  It uses scrypt-based key-strengthening as part of the encryption.  Or grab the rootkey and chaincode, and encrypt it yourself, however you see fit.

As for the second point, I recently added a feature in Armory in Expert-usermode.  It allows you specify your change address for each transaction.  You can either use two recipients -- the recipient + your other offline wallet, and use the "MAX" button to specify your remaining balance to your other wallet after you've entered the recipient.  Or you can specify the recipient only, and use the options on the bottom left to specify the change (which will not necessarily sweep the entire balance, but only send the change from the transaction to the new wallet).

I have a Raspberry PI as well. I actually got it to mine with a handful of Icarus using Archlinux (was far more work than I thought it would be), but I'd rather use it as an offline wallet storage. If someone were to create an offline version of Armory on it, I think I'd be willing to start the bounty at 10 BTC. PM me if anyone starts such a bounty, I'd be willing to contribute if it is relatively easy to use/backup.

Me too, I've got a Raspberry Pi on order …I want an offline address generator (based on bitaddress.org), however I don't want to print stuff out.  Instead, what I would like is to generate the private key and have it encrypted and displayed on screen as a QR code…then I want to snap a photo of it with my phone for backup purposes (and copy that photo to various online locations for backup).

As a further improvement, I would like a wallet that would sweep a specified amount of coins from an address to a new destination while sending change to a second address (which would be another offline generated wallet).  That would provide a convenient means of taking just a specified amount out of an offline wallet while returning change to a newly generated offline wallet.

Stirling engines are much more efficient and put out more power than solar cells.