eth_sendRawTransactionSync (EIP-7966) is live on testnet, and will go live on mainnet shortly This allows developers to submit transactions and wait for a receipt instead of having to poll More generally, version v0.12.3 is live on testnet, introducing - a wire authentication protocol for UDP communication between nodes - improved eth_getLogs performance - improved peer discovery logic - improvements to RaptorCast - and other robustness and performance improvements Changelog linked in the next post