PlasmaVM

Overview

• Derived from Kelvin's great article Why is EVM-on-Plasma hard?
• Not only for value transfer, but also for some simple contract.
• Consisted by Value and Contract paradigm from TxVM
• Fund security model is implemented via migration rather than exit
• Multiple Plasma Network is needed

Folder Structure

rootchain

• Solidity contract for deposit, commit, startExit, exitChallenge, finalizeExit, withdraw

childchain

• Entrypoint for childchain which interacts with ETH, RPC, DB, VM

vm

• Quasi general computation specific virtual machine
• Must remain receipt for state transition especially for owned-asset and locked-asset

rpc

• HTTP based JSON RPC
• plasma_sendTransaction can call embedded-contracts by refering some function name and args

storage

• LevelDB or something for storing Tx, receipt and state

eth

• Adaptor for Ethereum rootchain
• Web3 interface https://github.com/tomusdrw/rust-web3/blob/master/examples/simple_log_sub.rs#L36-L57

watcher

• Observe childchain's merkle tree.
• Clients' must see his own state on childchain via his local proof
• Watcher will do some more complehensive watching but must be decentralized. See Tesuji Plasma.