Init beacon root precompile state for genesis (#5982)

Author: flcl42

src/Nethermind/Nethermind.Consensus/BeaconBlockRoot/BeaconBlockRootHandler.cs src/Nethermind/Nethermind.Blockchain/BeaconBlockRoot/BeaconBlockRootHandler.cs

@@ -15,6 +15,7 @@
 using Nethermind.Evm.TransactionProcessing;
 using Nethermind.Specs.ChainSpecStyle;
 using Nethermind.State;
+using Nethermind.Consensus.BeaconBlockRoot;
 
 namespace Nethermind.Blockchain
 {
@@ -24,6 +25,7 @@ public class GenesisLoader
         private readonly ISpecProvider _specProvider;
         private readonly IWorldState _stateProvider;
         private readonly ITransactionProcessor _transactionProcessor;
+        private readonly BeaconBlockRootHandler _beaconBlockRootHandler;
 
         public GenesisLoader(
             ChainSpec chainSpec,
@@ -35,6 +37,7 @@ public GenesisLoader(
             _specProvider = specProvider ?? throw new ArgumentNullException(nameof(specProvider));
             _stateProvider = stateProvider ?? throw new ArgumentNullException(nameof(stateProvider));
             _transactionProcessor = transactionProcessor ?? throw new ArgumentNullException(nameof(transactionProcessor));
+            _beaconBlockRootHandler = new BeaconBlockRootHandler();
         }
 
         public Block Load()
@@ -45,6 +48,8 @@ public Block Load()
             // we no longer need the allocations - 0.5MB RAM, 9000 objects for mainnet
             _chainSpec.Allocations = null;
 
+            _beaconBlockRootHandler?.HandleBeaconBlockRoot(genesis, _specProvider.GenesisSpec, _stateProvider);
+
             _stateProvider.Commit(_specProvider.GenesisSpec, true);
 
             _stateProvider.CommitTree(0);

src/Nethermind/Nethermind.Consensus/BeaconBlockRoot/IBeaconBlockRootHandler.cs src/Nethermind/Nethermind.Blockchain/BeaconBlockRoot/IBeaconBlockRootHandler.cs

@@ -389,6 +389,12 @@ private static void LoadGenesis(ChainSpecJson chainSpecJson, ChainSpec chainSpec
             genesisHeader.ExcessBlobGas = chainSpecJson.Genesis.ExcessBlobGas;
         }
 
+        bool isEip4788Enabled = chainSpecJson.Params.Eip4788TransitionTimestamp != null && genesisHeader.Timestamp >= chainSpecJson.Params.Eip4788TransitionTimestamp;
+        if (isEip4788Enabled)
+        {
+            genesisHeader.ParentBeaconBlockRoot = chainSpecJson.Genesis.ParentBeaconBlockRoot;
+        }
+
         genesisHeader.AuRaStep = step;
         genesisHeader.AuRaSignature = auRaSignature;
 

src/Nethermind/Nethermind.Blockchain/GenesisLoader.cs

@@ -25,5 +25,6 @@ internal class ChainSpecGenesisJson
 
         public ulong? BlobGasUsed { get; set; }
         public ulong? ExcessBlobGas { get; set; }
+        public Keccak ParentBeaconBlockRoot { get; set; }
     }
 }