This is a prototype.
This tool should only be used for experiments.
There are no alternative implementations, meaning you are totally dependent on this tool if you use it. That is a dangerous situation to be in.
Prototype-1 - for shares starting with shamir39-p1
Initial Unversioned Release - for shares starting with shamir39
Read more about how Shamir Mnemonics are encoded and decoded in the Draft Shamir39 Specification.
The specification is open to feedback. Feedback can be provided by raising a new issue in the github repostiory iancoleman/shamir39.
Read more at the official BIP39 spec
Read more on wikipedia.
This page uses a custom implementation of SSSS based on amper5and/secrets.js.
The implementation used on this page can be found in Shamir39 Library (currently under active development).
You can use this tool without having to be online.
In your browser, select file save-as, and save this page as a file.
Double-click that file to open it in a browser on any offline computer.
Alternatively, download the file from the repository - https://github.com/iancoleman/shamir39
Get the source code from the repository - https://github.com/iancoleman/shamir39
Shamir39 Library (under development) - https://github.com/iancoleman/shamir39/blob/master/src/js/shamir39.js
jsBIP39 - https://github.com/iancoleman/jsbip39
jQuery - https://jquery.com/
Twitter Bootstrap - http://getbootstrap.com/