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 use an OpenSource hardware  
 Which one?
 
 Good question, depends on your preferences, but seems like one of the market leaders is Trezor 
 i thought you mean an open-source diy Wallet 
 oh that sounds pretty complex, keep in mind the hardware wallet to be secure it must have a secure element (besides other hardware complex stuff)  
 I heard something about devices which didn´t safe the passphrase.
So maybe that devices don´t need a secure element. 
But i´m not sure about that