[{"type":"report","id":"BLC-STUDY-0305","title":"EXTCODEHASH opcode","author":[{"literal":"Nick Johnson"},{"literal":"Paweł Bylica"}],"issued":{"date-parts":[[2018]]},"publisher":"Nick Johnson , Paweł Bylica","URL":"https://eips.ethereum.org/EIPS/eip-1052","note":"Rights status: Official external source only. Not a licence to republish the paper."}]