Stake pool cold keys HD derivation

(Hierarchical) deterministic derivation of cold keys allows for their restorability from a seed and most importantly, their management on hardware wallet devices which in turn mitigates man-in-the middle attacks to which pool operators would otherwise be vulnerable if they managed their stake pool cold keys on a device not specifically hardened against alteration of the data to be signed/serialized without operator’s explicit consent.

Here’s a CIP that tackles this by proposing a standard to derive stake pool cold keys: