Opendime is a small USB stick that allows you to spend Bitcoin like a dollar bill. Pass 'em around!
This is a copy of contents of an example Opendime unit running the latest version of the firmware. You can use this to look at how it works, and to read the open-source code we provide.
There are three states for an Opendime:
- New unit (does not have a bitcoin address yet)
- Sealed (normal; has a payment address)
- Un-Sealed (private key is revealed; sweep your funds)
Because there are major difference between version 1 and 2, they have been placed in different directories.
How to view?
Clone this repo and look in the
new directory. That's exactly
what you would see on the Opendime when you first plug it in. For
example, on MacOS, this would be exactly the contents of
In this example, we copied
entropy.bin onto the drive to help it pick a random
private key. Once that's done, the disk drive will look like
sealed and that's
how you'd use the Opendime most of the time.
Finally, look at
unsealed to see what it looks like when you break the tab on
the Opendime. The private key is revealed, and in combination with the original
entropy file, you can verify we picked the private key in the manner we asserted.
Checking the private key math
To prove we are using the algorithm we claim, perform these steps:
pip install pycoin cd unsealed/advanced python rngverify.py ../../entropy.bin
Of course, you should also contemplate the python
... but it's pretty simple and only 75 lines.
What else is there to see?
You can unzip
support/pycode.zip file to see the simple balance
check and spending code, written in python.