[IBFT] Block difficulty is one

chain/chain.go

@@ -17,7 +17,7 @@ var (
 	GenesisGasLimit uint64 = 4712388
 
 	// GenesisDifficulty is the default difficulty of the Genesis block.
-	GenesisDifficulty = big.NewInt(131072)
+	GenesisDifficulty = big.NewInt(1)
 )
 
 // Chain is the blockchain chain configuration

consensus/ibft/ibft.go

@@ -351,7 +351,7 @@ func (i *Ibft) buildBlock(snap *Snapshot, parent *types.Header) (*types.Block, e
 		Miner:      types.Address{},
 		Nonce:      types.Nonce{},
 		MixHash:    IstanbulDigest,
-		Difficulty: parent.Number + 1,   // we need to do this because blockchain needs difficulty to organize blocks and forks
+		Difficulty: 1,                   // we need to do this because blockchain needs difficulty to organize blocks and forks
 		StateRoot:  types.EmptyRootHash, // this avoids needing state for now
 		Sha3Uncles: types.EmptyUncleHash,
 		GasLimit:   parent.GasLimit, // Inherit from parent for now, will need to adjust dynamically later.
@@ -901,7 +901,7 @@ func (i *Ibft) verifyHeaderImpl(snap *Snapshot, parent, header *types.Header) er
 	}
 
 	// difficulty has to match number
-	if header.Difficulty != header.Number {
+	if header.Difficulty != 1 {
 		return fmt.Errorf("wrong difficulty")
 	}
 

consensus/ibft/ibft_test.go

@@ -474,7 +474,7 @@ func (m *mockIbft) DummyBlock() *types.Block {
 	block := &types.Block{
 		Header: &types.Header{
 			Number:     num,
-			Difficulty: num,
+			Difficulty: 1,
 			ParentHash: parent.Hash,
 			ExtraData:  parent.ExtraData,
 			MixHash:    IstanbulDigest,