I have never been a parent, and have only seen the effect of the age of the internet on kids from the outside. I have seen two different approaches to some degree and think neither has served children well. The cloistered internet, or the free-range internet.

Of course, the tempting solution is digital id. You can't access the full internet without it. And that is such a good solution on the surface. The child gets fingerprinted or gets an implant, and they are safe. They can't hack in or break in save maybe on a legacy device that does not require it. Everyone would require one because without it, no internet.

On the flip side to that idea of always being tracked and logged, there could be a blockchain id, only known to you, and only you are responsible for it. You could carry it around, maybe memorize the passphrase, and that is a full internet key you opt into. All material deemed "age sensitive" would require that key.

I am sure there are many things wrong with this idea as well, and it certainly brings up some "mark of the beast" insinuations that again are not pallettable, but decentralized and private anything is the way to go on any of these solutions.