Good interview! Nothing is ever 100% safe, but you just do the best you can. Single sig for most people is enough. There is usually a weak link at fault, like storing keys unsafely, etc. Weak links like when many homes in the Pacific Palisades had extremely heavy expensive fire proof safes that were built to withstand fires. They just never expected massive inferno type apocalypse level fires destroying every thing in sight. Most of the safes didn't save what was in side of them. Gold and other metals melted into piles of blobs. Paper files were entirely gone.