http://lxqyom6a3p6fdgsy6mpjyhjqjdpzleseck2jojwwzcilmsvduaeo7zyd.onion/2020/06/11/how-to-prove-control-of-a-bitcoin-segwit-address/index.html
This is quite unsatisfactory, given that there are so many upsides to using segwit addresses over old legacy addresses (those that begin with “1”); one of the main reasons is that using segwit addresses significantly decreases transaction fees. There are a number of online services that offer signing services, but all these come with the intrinsic problem that during the process you must disclose your private key, which is something you never want to do online (why we will...