XDai Chain is a US dollar Stablecoin blockchain jointly launched by the MakerDAO Foundation and POA Network, and is also a side chain compatible with Ethereum. It uses the Stablecoin xDai (converted from the decentralized Stablecoin Dai on Ethereum in a 1:1 ratio on the side chain) as the basic token for transaction and payment of gas fees, and uses the STAKE token to conduct bookkeeping and governance with the unique proof of equity algorithm POSDAO.The mode of single token used by xDai Chain for transaction and payment of gas eliminates the need to hold additional ETH payment gas on the Ethereum main network, and enables fast payment at low cost and stable service charges, which is very suitable for building application scenarios based on payment and DeFi. In the future, this side chain model will be further extended to other Stablecoin except Dai and other main chains except Ethereum, and STAKE will still exist as the governance token of these side chains....