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Besides, he said, the US government restricts the sale of some high-valued products to China based on the argument that they do not want to share some leading-edge technology with China.

Bettina Warburg, the founder and director of Blockchain Futures Lab, said in a talk: "It's basically a public registry of who owns what and who transacts what."

Biden's remarks as he campaigned in the battleground state of Michigan hours after testing negative twice for the virus, served as an implicit criticism of the Republican president. Trump has played down the deadliness of the virus for months, frequently eschews masks and has held campaign rallies of thousands with little social distancing.

Being promoted as "a role model of high-quality development", China's Guangdong-Hong Kong-Macao Greater Bay Area is poised to become "an international first-class bay area" and "a world-class city cluster" with a marked increase in its economic strength and regional competitiveness, according to a development blueprint released by the Chinese government in February.

Biden, 77, has said that he will choose a female running mate, while he has faced pressure within the party to select a woman of color.