Cross-VM Bridge

Flow provides the cross-VM bridge which enables Cadence to interact with EVM on Flow in order to bridge tokens, fungible and non-fungible, from one VM environment to the other. Specifically, the cross-VM bridge is contract-based, trustless protocol enabling the automated bridging of tokens from Cadence into EVM into the corresponding ERC-20 and ERC-721 token types. In the opposite direction, it supports bridging of arbitrary EVM ERC-20 and ERC-721 tokens into the corresponding Cadence FT or NFT token types. The cross-VM bridge internalizes the capabilities to deploy new token contracts in either VM state as needed and resolves access to, and maintains links between, contracts. It additionally automates account and contract calls to enforce source VM asset burn or lock, and target VM token mint or unlock.

Developers wishing to use the cross-VM bridge will be required to use a Cadence transaction of contract. Cross-VM bridge functionality is currently not available natively in EVM.

The Flow VM bridge outlines the architecture and implementation of the VM bridge. Read the FLIP here.