MferSafe

The general Dapp front-end will use their own web3 rpc to query the chain state via functions such as [eth_call], which always returns the real-word state we don't need. In order to correctly simulate state mutation and let the frontend show the simulated state, we need to redirect [eth_*] function call to the MferSafe node to avoid inconsistencies between the state queried via the EIP1193 Provider and the RPC state built into the Dapp front-end.