These contracts are for implementing the EIP-1559 burn mechanism on the Polygon mainnet and Mumbai testnet. It uses Polygon Plasma implementations to batch-transfer and batch-burn MATIC ERC-20 tokens on the Ethereum mainnet and Goerli testnet, respectively.

The same contract is deployed on both chains at the same address. This can be done using CREATE by having the same nonce on an EOA, or using the Deployer contract to deploy deterministically using CREATE2.

• Deposit native gas token (MRC20) to the contract on the chain child
• Call the contract's withdraw() function to trigger a withdrawal to the root chain (the withdrawal is performed in the contract's context)
• Submit the withdraw() transaction proof to the contract on the root chain, on the initiateExit() function with the appropriate plasma predicate
• Wait for the exit period (7 days for mainnet)
• Call the exit() function with enough gas (> 370k) and the contract will perform the exit for the tokens and transfer them to 0x...dead (MATIC ERC-20 is not burnable).