I suggest using the local wallet of the full block, the encryption of the bitcoin private key, which is currently unbreakable.
But quantum computers could change all that.
The quatumcomputer is fiction.
Common sense tells it can't be done.
There is 0 or 1, left or right, up or down.
It can't be both.
We will see more and more robbery of common people in their own homes.
Far better to rob a building that has the currency like a bank, without the security of a bank.
Like at a bank-robbery, every one at home with a huge amount of bitcoins is like a bank.
I have the idea to make a storage, like an old physical bank,
but then not for gold, diamonds and cash, but mainly for bitcoin.
It is crazy to have your gold in a safe at the bank, and the jackpot at home.
I have a opportunity in a old bank that is empty for 20 years.
It has the big safe and smaller lockers still in the building
If someone kills your dog, and threatens to do the same with your children,
you are likely to take a place behind your computer and make a donation to the robber.