Some of China’s cryptocurrency heavyweights have called off a US$500 million ether digital asset treasury (DAT) project, as the broader crypto market remains in a slump, according to people familiar with the matter.The project was initiated earlier this year by Huobi founder Leon Li Lin, HashKey Group chairman and CEO Xiao Feng, Meitu co-founder Mike Cai Wensheng and Fenbushi Capital founder Bo Shen, who aimed to raise US$500 million to launch a DAT firm that would invest in the world’s...