Congrats
I love electrum it has so many features.
However the depth of features may not be apparent to the novice user. Some sort of UX change to bring some of the buttons like freeze etc to the fore front may be useful. Eg I like to control what addresses send and recieve what.
The only technical nag I have is as posited before....If repeated public spending from addresses some how builds up a picture of the original MPK and private key....which was answered no, but it some how sits in the back of my mind that there must be some sort of backwards linkage.
Apart from that I struggle to thing of anything I could even want electrum to do better....it does everything so well.
Well I'm not an expert, but here's what I think:
Seems unlikely because each address is created using a double sha-256 hash of the sum of the address sequence and the MPK. So you'd have to have some pretty advanced crypto cracking there just to figure out
The MPK.
Even if you knew the MPK, the master private key would be protected by ECDSA.
But what may be dangerous is revealing one private key in the wallet may compromise the whole wallet.
It says so in a warning message if you try to export your keys.
If you want extra security for a cold wallet, simply create a new cold wallet and send your funds to a single address there.
