First release of the Plasma MVP specification using ETH as the native currency. The contract allows for users to deposit funds which are assigned to a unique nonce. These deposits can subsequently be spent on the plasma chain that is run by the operator. The operator also must publish block headers and metadata to the contract. These committments can be batched into one call to save on gas fees. As in the original spec, this implementation relies on confim signatures to ensure trustlessness between the users and operator. The confirm signatures are embedded into the txBytes upon spends to ensure data availability and are published with each exited output with the exception of deposit exits. See docs for a more detailed explanation of each function call. Our research repository has information about many of the design decisions in this implementation.
There are several improvements such as arbitrary ERC20 support that will be included in upcoming releases!