The TokenBridge allows users to transfer data (e.g. digital asset ownership information) between two chains in the Ethereum ecosystem. Cross-chain bridges provide fast and secure connections between blockchains, creating scalability and connection - interoperability - between Ethereum networks.
TokenBridge operates in several modes depending on the network requirements. A simple UI allows any user to bridge assets to and from active chains.
The following bridges are fully-functional in production environments:
POA Bridge (POA network to Eth Mainnet):The POA Bridge was the first EVM cross-chain production bridge in existence.
xDai Bridge (Eth Mainnet to xDai Network): The xDai chain uses the ERC20-to-Native TokenBridge functionality to provide fast, inexpensive and stable transactions.
Eth Classic Bridge (Eth Classic to Eth Mainnet): The Eth Classic Bridge connects ETC to ETH, where ETC is available as WETC.