MAP protocol is an open, fully decentralized chain-to-chain interoperation protocol that enables the interoperability of multiple independently verifiable consensus blockchains. MAP protocol expects to construct an interoperable blockchain network, linking different blockchains together, integrating the resources and capabilities of each chain, provide a complete and available blockchain underlying infrastructure for finance, AI, Internet of things, traceability, governance, and other applications.

The chain itself can achieve lightweight arbitrary interaction without the need to relay through a relay chain under the independent self-verified consensus mechanism. And for the non-independent self-verified consensus mechanism, the chain can achieve lightweight arbitrary interaction through the relay anchoring mechanism. Unlike other chain interoperation solutions, MAP protocol is trying to achieve chain interoperability in a trustless setting. This means there is no trust third party. The security of MAP protocol should rely on cryptographic evidence. Besides, the protocol needs to make sure the size of the cryptographic evidence is reasonably small. Furthermore, the verification procedure should be non-interactive.