Hi,
I am going to develop an open source cold storage wallet with multiple crypto support and with the following features:

1- we do not save any private key and only ask for the private key when the user decides to send some coin
2- our app will be fully offline and it needs to get online only when the user decides to send some coin or retrieve transactions
3- open source
4- top 10 cryptos will be supported
5- very simple user interface

what do you think? is there any app like this?
I will use nodejs + angular + electron to build this app.
If you like to develop with me, mail me.
we will start our project in GitHub as soon as I get sure this app will be useful enough for cryptocurrency fans.

my email, farhad2161[at][yahoo.com]