Interoperability is the ability of different systems or platforms to communicate and exchange data seamlessly. In the metaverse, interoperability means that various different metaverse platforms can all host each individual user’s identity in a seamless way, avoiding people having to cross unnecessary barriers as they traverse between them. The concept of digital passports allows users to act with a single digital identity, which can be used to identify them and carry their information across different metaverse platforms. However, there are concerns that the implementation of digital passports may result in centralization and lack of privacy, so it is important to consider the implications of this technology carefully.