Key derivation from Watching Only Root Data

[levino]

Hey Alan,

I would like to generate keys from the Watching Only Root Data of a wallet (when I hit "export read only copy").

What are the rules for this derivation? I can't find them in the documentation so far and I would very much appreciate a hint. I plan to extend the bitcore.io library with this. They have also a derivation algorithm implemented to derive keys from the master public key, but I can't find a way to show it to the user within armory.

Thanks for feedback

Levin