OK, I somehow managed to register with Mixin and download everything that is needed for testing, so I decided to send my application for review.
I do like the idea of Multisig

Question for cedricfung:
Some people in my local board are not sure what wallets are supported except ones mentioned so far (Ledger, Bitcoin Core, Bitbox, Coldcard, Mornin key, etc), so can we find a list of all supported devices/wallets?
Is Trezor hardware wallet supported?