One of the issues with Bitcoin and other crypto coins is the ever growing size of the blockchain, which contains every transaction.
Some coins are looking at ways around this.
Pascal is one.
Heat is another.
Are there more coins trying to do this?
As far as I know, bitcoin is (or will be soon?) be able to function pretty much as safe as reasonably needed with the pruned mode. I think you can already enable pruned mode, but you need to download the entire thing once the first time. I think they are working on this.
If you hold 1 year worth of blockchain data, it should be reasonably safe. Who the hell is going to be able to go 1 year back in time anyway?
Of course entire blockchain copies are always ideal and they can't disappear.
Im not sure how those coins work. I remember reading about Pascalcoin but I have no idea.