The Republic protocol (ren) is a protocol for a large number of encrypted assets between btc/eth, btc/erc20 and eth/erc20 to be traded in a distributed dark pool. It is the only blockchain enterprise known to have such a technology. In the traditional American and European stock markets, dark pool trading accounts for about 10-30% of the trading volume of all industries. JPMorgan Chase, Goldman Sachs, fidelity, Deutsche Bank and Morgan Stanley are among the few brokers with dark pool trading. "Dark pool" trading is one of the most important forms of "alternative trading system". Normally, when trading in the exchange, all sales orders will be published, but institutional investors operate in the "dark pool" through the high-frequency operation of traders. "Dark pool" trading conveys the "intention" of buying or selling stocks to specific investors. The original purpose of passing these "intentions" is to test whether the instructions can be matched among a small number of investors, but in fact, most of the "executable" intentions have finally completed the transaction without the public knowledge. "The main advantage of dark pool trading is that institutional investors who conduct block trading can not be exposed when looking for buyers and sellers. It can prevent the impact on the entire market and avoid depreciation. The Republic protocol system relies on a well-designed incentive system to ensure that players comply with the rules. Renex" dark nodes "runs a matchmaking engine to ensure the operation of dark pools. At the same time, the existence of multiple dark pools will reduce the risk of counterparties. To prevent malicious attacks, the darknodes must pay 100000 Ren, which is the token of the Republic protocol.