What is in your opinion the most exciting Bitcoin technologies that are emerging?
In my case, I was pretty impressive when I first heard of LNURL protocol and two particular use cases: authentication via LN and Point Of Sale offline machines. For those who don't know yet, Point of Sale is (i will try to explain my best) a way for merchants to receive LN payments in a more convenient way: instead of having to generate an invoice order via a LN wallet, they can use for example an offline machine that generates QR code enconding a LNURL, the user scans it and pays it right there, even if the merchant is offline (but the user has to be online)