MakerDAO multi-mortgage Dai (MCD) online

The MakerDAO Multi-Mort Dai (MCD) feature is officially available on the Ethereum mainline, and the associated smart contracts are fully deployed and the ABI interface is also available. All Dai tokens in front of the MCD feature have been renamed Sai, and the stable currency generated by the multi-mortgage in the future will be named Dai and the contract address has been updated.