[{"type":"report","id":"BLC-STUDY-0297","title":"Add `blockHash` to JSON-RPC filter options.","author":[{"literal":"Micah Zoltu"}],"issued":{"date-parts":[[2017]]},"publisher":"Micah Zoltu","URL":"https://eips.ethereum.org/EIPS/eip-234","note":"Rights status: Official external source only. Not a licence to republish the paper."}]