The transaction of the outer disk is in US dollars abroad, and the transaction of the inner disk is in RMB at home. The funds in the outer disk are converted into US dollars and traded in the private bank accounts of foreign banks. There is a risk of unsafe funds. The inner disk directly cooperates with domestic banks, and the funds are in their own bank accounts, so the funds are relatively safe.

Because the external market is abroad, it is not subject to legal supervision, the funds are unsafe, and the leverage is relatively large, which is easy to explode. However, under the guise of low discount fees, most of the external markets are at risk of running away, and the principal is easily lost. At present, the foreign over-the-counter trading agency business has not been officially launched in China, and the so-called London Bank or new york Futures crude oil trading agents or brokers are illegal agents. Domestic investors' participation in these so-called overseas agents' underground silver transactions is not protected by law, so it is difficult to generate disputes.

Foreign trade is prohibited in China, and formal foreign trade orders will not enter the mainland without violating the laws and regulations of the China government. Only some small or informal institutions will find some individuals or informal companies as agents in the mainland through some underground channels, which will bring great risks to investors' funds.

The inner disk is regulated by domestic laws, and the funds are managed by the third party of the bank, so there is no risk in the principal and the handling fee is higher than that of the outer disk.