The short videos are nice, but I think they should all end with a very brief explanation of the security model and a link to learn more about the security model. If I’m watching this for the first time, my skepticism would be around who has access to my accounts. Hearing that the API keys don’t leave my device also might be over the average user’s head. Somehow nailing that explanation in a brief manner would really help these short videos

This is cool!

I do not see anything "revolutionary" in this. Just a meaningless sell BTC to fiat trade.