Bitcoin Forum

Announcing Piper, a hardware based bitcoin paper wallet generator and printer.  

Learn about Piper and see a prototype in action here: http://youtu.be/XZ2myql_i8w (http://youtu.be/XZ2myql_i8w)

Piper is composed of a tiny linux-based computer, a small printer, and a single button.  Pressing the button causes the computer to generate a public/private key pair, and then print the keypair along with QR codes.

Piper also has an HDMI port and a USB port, so you can hook it up to a TV/Monitor and Mouse and Keyboard and customize your prints, or just hack Piper to do whatever you want.  You can even hook up your own printer to the USB port and print using it.

Piper has no internet connectivity, so your bitcoins are guaranteed to be safe.  No more hassling with LiveCDs.  Just boot up Piper and you're ready to go.

Piper will be shipping in June for $120 or http://fizzisist.com/priceimg/img/120 (BTC value may change and will be based on whatever $120 is worth when we send out the invoices)

If you want to buy Piper, you can preorder on the http://www.piperwallet.com (http://www.piperwallet.com) site (pay later).

You can get more info here on the FAQ page: http://www.piperwallet.com (http://www.piperwallet.com)

Thanks everyone, and feedback appreciated!

Edit: Added slightly better video

It doesn't really bother me that it looks like a thermal printer in a cardboard box. You didn't demonstrate any of the other functionality. So, I'm not sure if this is serious.

As of right now, when you boot it up and it's hooked up to a monitor, bitaddress.org is loaded locally and pops up.  

It's just a standard linux distribution, any more advanced functionality is up to the end user.  The idea is that people would hack it and do whatever they want to do with it.


I'm open to suggestions on what else the software should have.  I was thinking a basic GUI program that takes any image as input and prints it on the printer.

I will make a demo video of it hooked up to a tv/mouse/keyboard so you can see.

From a prior post inquiring about creating this exact type of device:


So from your FAQ you show:


What type of printer will you use?


Can this be powered from a USB port (i.e., made to be portable), or will it require power from an outlet?

Also, I'ld like the ability to print two (or more) copies.   

Additionally I'ld also like to see a time and date on the printout, or maybe just some type of sequential number (so I could easily navigate through a stack of these to  pull a specific one.)

i'll buy. 

First of all, thanks for the feedback!  I wasn't aware of that post, if I had seen it I would've been more clear about the life of the image.

Anyway, I was also concerned about the life of the image.  I made sure to buy "long life" thermal paper, but "long life" wasn't really specific enough for me so I emailed the distributer where I bought the paper about image life, and this is what they said: "Stored under the proper conditions (In a cool, dry environment with no exposure to light) the product will last generally 3 years or more."  

I'm looking into buying a better type of paper though, which will last 20 years.  Here's an image of the manufacturer's spec sheet: http://piperwallet.com/newpaper.png (http://piperwallet.com/newpaper.png)


It's a direct thermal printer (not thermal transfer), but the paper we're using (even the 3 year life one that we currently have) is long life thermal.  The new stuff we're looking at is archival quality.  Think airline tickets.


Due to the power requirements of the printer, it can't be powered from a standard USB port (500mA) although it may work from a high power 1Amp USB port.  


This is a great idea, Thank you!  I will try to make it so that when you press the button multiple times in succession it will queue up multiple copies to print.


That's a great idea, but the Linux computer that powers the device does not have a battery to keep track of the time across reboots.  I think this may be a good feature for the GUI though, where it will force the user to set the time and date if they want a timestamp on the paper wallet.

I will definitely try to add the sequential number as well, thanks for the tip!

You should stick this on kickstarter  :P

Wasn't there a Bitcoin based kickstarter thing? Is it still alive? And is it trustworthy?

Cool project!  CoinFunder.com is still alive and kicking. Growing every day!

Was it called BitStarter before or is that another one?

BitcoinStarter.com is still very much active as well.

I added a few new features to Piper and posted a new video: http://youtu.be/XZ2myql_i8w (http://youtu.be/XZ2myql_i8w) 

First, I added a serial number to every paper wallet that is printed.  

Second, I added the ability to print two identical paper wallets by holding down the button until the printer starts printing.  Here's a demo video of that functionality: http://youtu.be/aYqY19l5cow (http://youtu.be/aYqY19l5cow)

So do we all trust the RNG seed used by Bitaddress.org enough to consider this a good solution? I applaud you for making it, it's quite needed, but want to make sure it's up to snuff before I buy one. It's likely you already have my bitcoin you just don't know it yet :P

How about including a cheap camera inside the case, as a physical source of randomness, using somthing like LavaRnd (http://lavarnd.org/faq/index.html) to interface with it?

Nice to see some more activity in the paper wallet area.

Here's my prototype for a wallet printer.

http://www.youtube.com/watch?v=f7y_emuo68g (http://www.youtube.com/watch?v=f7y_emuo68g)

I'm afraid I didn't have any wood effect paper to wrap it in :)

I agree with the concerns about thermal printing so I'm currently experimenting with the epson m-190 printer.

http://www.youtube.com/watch?v=yWz-9c-KAus (http://www.youtube.com/watch?v=yWz-9c-KAus)

Its dot matrix so I have a good feeling about the longevity of its print outs.

In my opinion $120 seems a bit steep. I'm aiming for $50 for a small run of 100.

I look forward to seeing this develop.

Thanks for the kind words :)

Right now it uses vanitygen for the paper wallets.  Vanitygen is considered pretty safe, but I plan to add unique entropy to /dev/random from random.org which gets its entropy from atmospheric noise, so that every Piper unit is unique.  Don't worry though, I will not release Piper unless the bitcoin community is satisfied with the key generation algorithm/seeding process.

Here's some more info on how vanitygen generates it's keys, from the thread here on bitcointalk:

Cool, what's your final housing expected to be made out of?

I'm watching this closely. I think it would be a great idea for restaurants to print out receipts where users can send the bitcoin to the address on the paper. It's not important that it lasts forever, it would be enough to give the bill to the client, leave it at their table, and they can pay it and wait for 1st confirm while they finish up their meal. Obviously, you would print only the public key and save the private key. :-)

I have seen better ones for less. So a no from me.

Cool. Do you have a link?

https://bitcointalk.org/index.php?topic=202133

These look like they have somewhat different functionality other than the printing part. The extra features of the Piper may be worth the difference. Actually, I can think of ways to improve the Piper since it is customizable.