[{"type":"report","id":"BLC-STUDY-0341","title":"Supplant DIFFICULTY opcode with PREVRANDAO","author":[{"literal":"Mikhail Kalinin"},{"literal":"Danny Ryan"}],"issued":{"date-parts":[[2021]]},"publisher":"Mikhail Kalinin , Danny Ryan","URL":"https://eips.ethereum.org/EIPS/eip-4399","note":"Rights status: Official external source only. Not a licence to republish the paper."}]