Whitepaper/design/cryptography

We're a team who is working on a device that allow to make transactions of cryptocurrencies (bitcoin) using an usb KEY and a bracelet. These are some features they shoud have : Crypted key (key + core) - encrypted key 512/2048 bit - core bracelet: key works only if you are closer than 1mt - waterproof - i2p Cypher messaging - key alarm VS (Visual and Sound): if you are attacked the key flashes and beeps - built-in hardware wallet So basically we need a paper where we describe how it works. And even a design of it. a scheme that represent the usb key and the bracelet. With an analysis scheme about the cryptography works.