However, in addition to the gas cost issue, in terms of data verification mechanisms, Chainlink and the DOS Network, which is also a mainstream decentralized oracle project, have systemic risks. This systemic risk lies in the cost of attack caused by the indirect verification mechanism and the credit system of nodes. The contracts of these two projects only verify the identity and credit of the data uploader, and ensure the accuracy of the data through such indirect verification. In this way, the node's attack cost is almost dependent on the credit stake, and will not change as the data provision behavior changes. The mechanism of indirect verification can effectively improve the efficiency of the system, but it is also accompanied by a high success rate of malicious nodes. When dealing with small-scale, non-financial scenarios, because the benefits of malicious attacks are small, the simple verification mechanism has almost no security risks. However, once the scale of assets derived from the data provision behavior is much larger than the staked funds of nodes, the profit of malicious attack will be much greater than the credit risk, and the tendency of the malicious attack will greatly increase. This is an inherent problem of this type of indirect verification mechanism. If you only modify the superficial logical relationship (such as increasing the nodes’ credit risk control, etc.), the risk cannot be substantially eliminated. Based on the above considerations, such a mechanism is only suitable for small-scale and non-financial application scenarios, and is difficult to apply to large-scale, financial markets.