I just saw some movie about an ancient king seeking immortal life by uploading his memory into another new body every time he dies.

It is quite similar here, since memory is just lots of data and logic, you could upload your data and special logic onto blockchain using smart contracts, it could run many generations after you died. This has been simulated in many sci-fi games but all those systems failed eventually, since there is a single point of failure. Now it is actually making some sense on blockchain

Constructing the rules of an ideal society, and let the rules run on blockchain for thousands of years, even better, those rules have the ability to self-upgrade, we are just seeing the beginning of this revolution for humanity