Worldcoin and Humanity are both projects for web3 digital identity. How can we see the differences and competitive relationships between them? If we look at it from a technical perspective, the main difference is that the two use different biometric technologies. Humanity (@ Humanityprot) uses Palm Vein Scanning, which simply captures subcutaneous vein patterns using near-infrared light; And Worldcoin (@ worldcoin) uses Iris Scanning, which performs iris scanning through dedicated machine hardware devices. Due to the use of different biometric technologies, there are differences in the collection process between the two. Huamanity users can capture data by scanning their palms with a smartphone camera; Worldcoin requires going to specific stores (with dedicated hardware devices for iris scanning). There are some controversies regarding the security and encryption of the device itself, and whether there may be privacy issues. If we follow its explanation about adopting ZK technology and only retaining the corresponding hash, it seems to protect privacy. But the specific situation is not enough. In addition, due to the fact that palm print scanning can be achieved through smartphones without the need for specialized hardware to participate in collection, the participation threshold is lowered, which is helpful for some underdeveloped areas to participate in web3, especially in the future stablecoin payment scenarios. From a compliance perspective, palmprint scanning is less invasive than iris scanning and has a higher likelihood of being approved by some countries in terms of regulation and compliance. Of course, Worldcoin also has its advantages, firstly, it has developed over 10 million users; Secondly, dedicated hardware can be equipped with multispectral sensors and AI anti fraud algorithms, providing a high level of security protection; Thirdly, it was personally endorsed by Sam Altman. Worldcoin is already one of the most important customized L2 in the Ethereum ecosystem. From a long-term competitive perspective, Humanity and Worldcoin each have their own advantages. Worldcoin's advantage lies in its higher security level, as it is a biometric technology combined with iris scanning and specialized hardware; Humanity, on the other hand, relies on low entry barriers to participate, lowering the threshold for user adoption and having the opportunity to achieve greater adoption speed. In addition, the most crucial aspect is how to embed it into various application scenarios and how to comply with regulations and rules in different countries or regions around the world, which will be key points in future competition. One possible scenario is that Worldcoin receives high support for certain scenarios with extremely high security levels; In scenarios where security requirements are not as high, Humanity may have more adoption advantages for web3 application interaction, game identity interaction, DAO governance interaction, etc. under a certain amount of money scale.