As an emerging public chain ecological cluster, Polkadot has shown its power. Through its excellent multi-chain slice architecture design, Polkadot has become the most anticipated alternative to Ethereum at present. With the bidding of the Kusama slot, smart-contract platforms like Moonriver (Moonbeam first network), Acala (Karura), and Shiden (Astar) have been put into use. These platforms give us a long-awaited low-Gas...