Chia is a very different beast. Some of the fundamental blockchain concepts aren't radically different from what's gone before, but Chia coin ditches the Proof of Work algorithm for securing the blockchain and instead implements Proof of Space technically Proof of Time and Space, but the latter appears to be the more pertinent factor. Rather than mining coins by dedicating large amounts of processing power to the task, Chia simply requires storage plots but these plots need to be filled with the correct data.