Hardware wallets/on-site safe wouldn't work. You'll just be forced to open the safe and transfer funds.
Other idea, is having smaller wallet/alternative exchange account that you keep only small portion of your holdings, but not too small. Then you could say that's all you got and hopefully robbers would take it and f**k off.
This is obviously good advise. Stay anonymous and don't brag about your mad crypto gains.
But not everyone can stay in the shadows, the victim in this case was/is running cryptocurrency trading firm, assuming the operations involve trading on behalf of clients and that his firm was registered, staying anonymous was not an option for the guy.
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Thanks. Updated OP with the link.