[nickpsecurity]

What you're describing are immutable, crypto-protected logs. They go way back before blockchains without blockchains problems. One was a big business:

https://motherboard.vice.com/en_us/article/j5nzx4/what-was-t...

I mentioned some random examples below showing that people stayed exploring and pushing the useful concepts again without all the bad stuff:

https://news.ycombinator.com/item?id=16776837