There are no "100% safe" solutions. There will always be weaknesses and vulnerabilities in any system. The sort of criminal who requires or expects 100% safety is quickly going to be caught due to being a dullard. Knowing you're never truly "safe" is what good criminals are keenly aware of at all times: you can plan and prepare for certain eventualities. Once you think you're "safe", it's the beginning of the end.
You don't do something, once, and then are good to go forever. Banks don't just put cash in a safe and forget about it; they have audits, security guards, cameras, threat intelligence profiling criminal gangs, etc.
