This tool calculates the public key of any sealed Opendime based on the contents of its advanced/verify2.txt
file.
You can use the tool here or you can run it locally on your computer.
-
Clone this repository.
-
Run
npm install
to install the dependencies, including Browserify. -
Run
browserify app.js -o opendime-pubkey.js
to compile the Javascript file to be used in the browser. -
Open
opendime-pubkey.html
in your browser to use.
-
Plug in your sealed Opendime. There is no need to reveal the private key for this to work.
-
Navigate to the
advanced
folder and findverify2.txt
. Copy the contents into the text area. -
Click on the
Calculate Public Key
button; you should see your Opendime's public key. -
Optional: Click on the
Copy to clipboard
button to copy the public key. An alert will appear if successful.
Opendime devices have a unique property that allow ownership of a private key without knowledge of it. Opendimes are also much cheaper than hardware cryptocurrency wallets. Finally, revealing the private key requires irreversible physical tampering (destruction).
I believe these qualities give the Opendime potential to be used as a physical access key, e.g. a physical multisig key. Since the complex issue of cybersecurity is reduced to the simple issue of physical security, storage is much more operationally simple than most other options such as a raw private key, encrypted private key, paper wallet, seed phrase, etc.
Use at your own risk. I will not be held accountable for any bugs or errors.
Most of the code in app.js is directly copied from bitcoinjs-message. I would like to thank the developers who made this library.