According to the tweet forwarded by the Cardano Foundation, the Cardano project has made a new breakthrough in the consensus mechanism Hyuroboros' second-tier capacity expansion scheme Hydra. After five years of research, Hydra's white paper for a two-tier expansion plan was released today. The white paper states that "Hydra is a fast isomorphic state channel. As a two-tier capacity expansion solution, it is used to improve the scalability of the blockchain and improve the block delay problem. Hydra can simplify off-chain protocols and contracts . "