we have developed a custom fork of R55 (an Ethereum Execution Environment that seamlessly integrates RISCV smart contracts alongside traditional EVM smart contracts) to handle signed raw transaction input and return the resulted computed EVM db.
After getting R55 to work with the OOTB interpretation of signed raw transaction, we built on top of it a hyperbeam device offering RISC-V compatible Ethereum appchains.
For example, this erc20.rs Rust smart contract was deployed on a hb risc-v appchain: github.com/loadnetwork/r55
