1/ The more I read about what @billbarhydt and the @AbraGlobal team are doing, the more I'm impressed by their ingenuity. I regret I haven't looked into their project sooner.

Here are the basics:
1. non-custodial and #d14n exchange
2. multi-sig
3. smart contracts 2/ Decentralized Exchange:

Abra is a non-custodial decentralized exchange. That means they don't own your private keys or hold your coins. When you log into the app, they give you seedkeys which you MUST write down. This is the first half of the 2-2 multisig.