Support for hardware wallets, e.g.: Nano Ledger S

[adrianbrink]

Once the network is live we should already have an integration for some hardware wallets as to allow especially big validators to securely store and transfer their atom holdings.

This issue is designed to gather the necessary resources and ideas to make this a reality.

Ethereum for Nano Ledger S
Ethereum Chrome

Process according to btchip on slack

btchip [5:19 PM] 
good question as I don't know much about Tendermint
[5:19] 
usually the process goes like this
[5:19] 
find out what you need to sign - and the cryptographic algorithms involved (edited)
[5:19] 
find out what you need to be verified (and displayed to the user) in what you sign
[5:20] 
then you can write a device app
[5:20] 
then the client app to talk to it or just a library

There are two parts to the implementation. The first one is a the software that runs on the secure device and the second one is the software that runs in Chrome or on the OS. For the former we have to write it in C or if we write the bindings in Rust. The latter can be implemented in JS.

Resources
https://blog.ledger.co/dynamic-secure-applications-with-bolos-and-ledger-blue-a-use-case-with-ethereum-and-the-dao-6be91260e89f

[ethanfrey]

This is super awesome issue, but too much specialized work for the tendermint dev team.

If anyone sees this issue and wants a contract to build this integration, please get in touch.

[ebuchman]

github.com/cosmos/cosmos-ledger