According to the Sichuan Daily, the world's first “small and medium-sized core enterprise blockchain payment guarantee letter” has been fully launched. Chengdu Bainaohui "Guanyong Specialty Store" with a registered capital of only 30 yuan has recently completed the first single financing with the upstream enterprise Zhongke Daqi on the ant "Double Chain Link". The guarantee for them is Chengdu SME financing guarantee. limited liability company. The entire financing transfer process is clearly marked and cannot be tampered with. All participants use the “Double Chain Link” infrastructure for identity verification and willingness to confirm. Digital signatures are real-time linked and cannot be depreciated. One chain eliminates risks such as misappropriation of funds.