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Kindly elaborate. Which ones? To what extent? What is the state of the art here?

This was my only issue with bitcoin when I evaluated it several years ago.

Pretty much all the newer ones, Nano, Iota and Eth probably soon to.

There is also a debate to use delegated PoS or a hybrid of PoS and PoW to get both of their upsides with none of tbeir downsides.

Iota is not a blockchain. It's also not a cryptocurrency. It's about 98% scam and 1% insane. and 1% Bosch.

Yes, 3rd gen blockchains aren't blockchains anymore. :)

> There is also a debate to use delegated PoS or a hybrid of PoS and PoW to get both of their upsides with none of tbeir downsides.

Read: PoS has downsides.

Yes that's why they hybrid.

So does cash

The casper-ffg paper is a pretty good spec for a hybrid PoW-PoS system, and is IMO a good place to start before looking into full PoS systems