There are none. The only practical example where a blockchain does things a centralised database doesn't is a Bitcoin-style cryptocurrency. (Even then, proof-o

There are none. The only practical example where a blockchain does things a centralised database doesn't is a Bitcoin-style cryptocurrency. (Even then, proof-of-work mining naturally recentralises, as we see with Bitcoin. Ethereum claims to be planning to move to proof-of-stake, but there's no working implementation or date for this.)