Blockchains are also DAGs. This is the basis of the 51% attack. It is completely...

		zaphar on Dec 1, 2018 \| parent \| context \| favorite \| on: Blockchain study finds zero success rate and vendo... Blockchains are also DAGs. This is the basis of the 51% attack. It is completely possible for a blockchains to fork. The consensus algorithm is how a particular branch is chosen as the winner. But the reason you need them is because blocks fire DAGs.