As someone already mentioned multisig wallets will be a must for future institutions being able to have crypto, shared signatures managed by a corporation of several directors or governance heads, and I only add that smart-contracts and timelocks could be usefull as well , I would expect example to see in future "legal testament", the private keys (or the recovery phrases) of crypto wallets, such documents are already 'secret' legal documents holded in secret untill one dies (by legal nature official assured) like patent holding agency cannot disclose the whole secret of coke or a cancer drugs, or a wealthy person testament, or the closed-sw-hashgraph (so there are valued secrets that can be registered by in some official legal systems) , these will end up being re-used depending on the big/huge amount of wealth that crypto will be recognized ... and that only depends on adoption and recognition by other civilized human organizations. For small amounts no trust in anyone is enough and your head should sufice, or make some puzzles like "The Da Vinci Code" just for the fun of it... do a pirate treasure map as to where you dig and hide your "cryptotag" then split it in half leave hints in your skin tatoos... LoL