Good info. I use a few hot wallets (Mycellium, Jaxx, blockchain.info) and I use Trezor for long term store. As I gather more altcoins, I need a cold store for these. Maybe a mobile phone with no connectivity or paper wallets for each.
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Or a bootable usb stick running linux in offline mode. Busy experimenting with various options to support multiple altcoins. Trying to print paper wallets for 10+ different coin can be a pain. Will be sharing my findings shortly, I like to test it thoroughly myself before sharing the detail