Is it possible to shorten the blockchain? I've been doing some research into Bitcoin and the blockchain in general, and I've come upon a question that I can't find much of an answer to.

With my current understanding of the blockchain, I wonder if it would possible to create a "summary" block, and start the chain over? reducing its size while still maintaining continuity.


The summary would have the hash of the last block in the old chain.
For length calculation, it would be considered an extension of the old chain, and therefore its length calculated by adding its length to that of the old chain.
I'm thinking that it would need to contain a summary of all accounts at the time of the summarization; essentially it would be the net of the old chain.


I found this question from five years ago, which helped a little bit. 

This article states that the current size of the blockchain is over 100GB, and thats from 6 months back.

I'm just trying to learn, and this question has been bugging me for a little while. Is something like this possible?
it is not possible, because there is no consensus rule who, how and when should do it and how sould others accept "new genesis" block