From 9fbe153bc4144784da0f2d3bdc04c9d70323822e Mon Sep 17 00:00:00 2001
From: Austin Chandra <austinchandra@berkeley.edu>
Date: Wed, 30 Nov 2022 11:37:42 -0800
Subject: [PATCH] fix: add random field to BlockContext using block header hash

---
 x/evm/keeper/state_transition.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/x/evm/keeper/state_transition.go b/x/evm/keeper/state_transition.go
index 3103a45cad..dec2384819 100644
--- a/x/evm/keeper/state_transition.go
+++ b/x/evm/keeper/state_transition.go
@@ -79,6 +79,9 @@ func (k *Keeper) NewEVM(
 	tracer vm.EVMLogger,
 	stateDB vm.StateDB,
 ) evm.EVM {
+	// Use BlockHash for random field
+	random := common.BytesToHash(ctx.HeaderHash())
+
 	blockCtx := vm.BlockContext{
 		CanTransfer: core.CanTransfer,
 		Transfer:    core.Transfer,
@@ -89,6 +92,7 @@ func (k *Keeper) NewEVM(
 		Time:        big.NewInt(ctx.BlockHeader().Time.Unix()),
 		Difficulty:  big.NewInt(0), // unused. Only required in PoW context
 		BaseFee:     cfg.BaseFee,
+		Random:      &random,
 	}
 
 	txCtx := core.NewEVMTxContext(msg)