In 2018, a crypto boss named Zhang sought help from Jiang Guoqing to ask Yao Qian to assist with his company's token issuance and fundraising project. Yao Qian accepted the request and reached out to a certain cryptocurrency exchange, helping Zhang's company successfully issue tokens and raise 20,000 ETH. Later, Zhang gave Yao Qian 2,000 ETH as a token of gratitude. At its peak valuation, these ETH were worth over 60 million yuan. The reason Yao Qian's influence worked is, of course, inseparable from the power of his position. So, who is Zhang? Which cryptocurrency exchange was involved? And what is the name of this token?