EthereumJ is a pure-Java implementation of the Ethereum protocol. Harmony is the front end client software and runs on top of EthereumJ. It is capable of fully syncing both ropsten and mainnet and is compatible with the Constantinople hardfork.
EthereumJ is a pure-Java implementation of the Ethereum protocol. Harmony is the front end client software and runs on top of EthereumJ. It is capable of fully syncing both ropsten and mainnet and is compatible with the Constantinople hardfork.