An Arbitrary Message Bridge (AMB) between the Ethereum Mainnet and the Ethereum Classic extends the number of the applications that can leverage cross-chain communications. It was mainly deployed as an experiment to migrate the vanilla TokenBridge serving exchange ETC to WETC to the AMB protocol.
Any application can build its own AMB extension. This is represented by two mediator contracts so that either assets or arbitrary data can be transferred between chains. The deployed mediator contracts do not require a set of oracles to be setup, allowing an application to launch quickly and reducing the cost of application ownership.
The mediator contracts rely on the following information about the ETH-ETC Arbitrary Message Bridge: