# Interoperability The major challenge with collaboration of any kind over blockchain networks is the protocols and complexities involved in the seamless and affordable transferring of assets or data between multiple blockchain systems. Cros proposes to overcome this challenge by deploying Blockchain bridges to enable cross-organizational collaboration across multiple chains. Bridges allow information and assets to be transferred between blockchains, allowing for easier collaboration. ChainBridge is an extensible cross-chain communication protocol. Cros will start using the "ChainBridge" design-pattern, from Polygon, for cross network communication and asses or data transfer. The ChainBridge operates on three types of contracts in each chain, referred to as Bridge/Handler/Target, as well as relayers to communicate between chains. These three types of contracts work with Relayer, an application that listens to the events emitted by these contracts under each chain and votes for a proposal in the destination chain's Bridge contract when it receives a "Deposit" event. Non-fungible token standards (ERC 721, ERC 1155 and others) allow NFTs to move easily across multiple ecosystems. When a developer or creator designs a new NFT ad-space or slot for a game platform, for example, it may be instantly viewed in dozens of wallet providers, tradeable on marketplaces, and displayable in game worlds. This provides another layer of interoperability that Cros aims to utilize and promote through active community participation. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.cros.world/tech-roadmap/interoperability.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.