diff --git a/eth/api.go b/eth/api.go
index 03ac74247e..bdbbd1ba38 100644
--- a/eth/api.go
+++ b/eth/api.go
@@ -35,7 +35,6 @@ import (
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/internal/ethapi"
-	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/ethereum/go-ethereum/trie"
@@ -70,7 +69,7 @@ func (api *PublicEthereumAPI) Hashrate() hexutil.Uint64 {
 // ChainId is the EIP-155 replay-protection chain id for the current ethereum chain config.
 func (api *PublicEthereumAPI) ChainId() hexutil.Uint64 {
 	chainID := new(big.Int)
-	if config := api.e.chainConfig; config.IsEIP155(api.e.blockchain.CurrentBlock().Number()) {
+	if config := api.e.blockchain.Config(); config.IsEIP155(api.e.blockchain.CurrentBlock().Number()) {
 		chainID = config.ChainID
 	}
 	return (hexutil.Uint64)(chainID.Uint64())
@@ -288,14 +287,13 @@ func (api *PublicDebugAPI) DumpBlock(blockNr rpc.BlockNumber) (state.Dump, error
 // PrivateDebugAPI is the collection of Ethereum full node APIs exposed over
 // the private debugging endpoint.
 type PrivateDebugAPI struct {
-	config *params.ChainConfig
-	eth    *Ethereum
+	eth *Ethereum
 }
 
 // NewPrivateDebugAPI creates a new API definition for the full node-related
 // private debug methods of the Ethereum service.
-func NewPrivateDebugAPI(config *params.ChainConfig, eth *Ethereum) *PrivateDebugAPI {
-	return &PrivateDebugAPI{config: config, eth: eth}
+func NewPrivateDebugAPI(eth *Ethereum) *PrivateDebugAPI {
+	return &PrivateDebugAPI{eth: eth}
 }
 
 // Preimage is a debug API function that returns the preimage for a sha3 hash, if known.
diff --git a/eth/api_backend.go b/eth/api_backend.go
index a48815e0db..7e90f80101 100644
--- a/eth/api_backend.go
+++ b/eth/api_backend.go
@@ -44,7 +44,7 @@ type EthAPIBackend struct {
 
 // ChainConfig returns the active chain configuration.
 func (b *EthAPIBackend) ChainConfig() *params.ChainConfig {
-	return b.eth.chainConfig
+	return b.eth.blockchain.Config()
 }
 
 func (b *EthAPIBackend) CurrentBlock() *types.Block {
@@ -130,7 +130,7 @@ func (b *EthAPIBackend) GetEVM(ctx context.Context, msg core.Message, state *sta
 	vmError := func() error { return nil }
 
 	context := core.NewEVMContext(msg, header, b.eth.BlockChain(), nil)
-	return vm.NewEVM(context, state, b.eth.chainConfig, *b.eth.blockchain.GetVMConfig()), vmError, nil
+	return vm.NewEVM(context, state, b.eth.blockchain.Config(), *b.eth.blockchain.GetVMConfig()), vmError, nil
 }
 
 func (b *EthAPIBackend) SubscribeRemovedLogsEvent(ch chan<- core.RemovedLogsEvent) event.Subscription {
diff --git a/eth/api_tracer.go b/eth/api_tracer.go
index 3a31db87e0..2800ff659c 100644
--- a/eth/api_tracer.go
+++ b/eth/api_tracer.go
@@ -201,7 +201,7 @@ func (api *PrivateDebugAPI) traceChain(ctx context.Context, start, end *types.Bl
 
 			// Fetch and execute the next block trace tasks
 			for task := range tasks {
-				signer := types.MakeSigner(api.config, task.block.Number())
+				signer := types.MakeSigner(api.eth.blockchain.Config(), task.block.Number())
 
 				// Trace all the transactions contained within
 				for i, tx := range task.block.Transactions() {
@@ -295,7 +295,7 @@ func (api *PrivateDebugAPI) traceChain(ctx context.Context, start, end *types.Bl
 				break
 			}
 			// Finalize the state so any modifications are written to the trie
-			root, err := statedb.Commit(api.eth.chainConfig.IsEIP158(block.Number()))
+			root, err := statedb.Commit(api.eth.blockchain.Config().IsEIP158(block.Number()))
 			if err != nil {
 				failed = err
 				break
@@ -460,7 +460,7 @@ func (api *PrivateDebugAPI) traceBlock(ctx context.Context, block *types.Block,
 	}
 	// Execute all the transaction contained within the block concurrently
 	var (
-		signer = types.MakeSigner(api.config, block.Number())
+		signer = types.MakeSigner(api.eth.blockchain.Config(), block.Number())
 
 		txs     = block.Transactions()
 		results = make([]*txTraceResult, len(txs))
@@ -501,7 +501,7 @@ func (api *PrivateDebugAPI) traceBlock(ctx context.Context, block *types.Block,
 		msg, _ := tx.AsMessage(signer)
 		vmctx := core.NewEVMContext(msg, block.Header(), api.eth.blockchain, nil)
 
-		vmenv := vm.NewEVM(vmctx, statedb, api.config, vm.Config{})
+		vmenv := vm.NewEVM(vmctx, statedb, api.eth.blockchain.Config(), vm.Config{})
 		if _, _, _, err := core.ApplyMessage(vmenv, msg, new(core.GasPool).AddGas(msg.Gas())); err != nil {
 			failed = err
 			break
@@ -561,7 +561,7 @@ func (api *PrivateDebugAPI) standardTraceBlockToFile(ctx context.Context, block
 
 	// Execute transaction, either tracing all or just the requested one
 	var (
-		signer = types.MakeSigner(api.config, block.Number())
+		signer = types.MakeSigner(api.eth.blockchain.Config(), block.Number())
 		dumps  []string
 	)
 	for i, tx := range block.Transactions() {
@@ -595,7 +595,7 @@ func (api *PrivateDebugAPI) standardTraceBlockToFile(ctx context.Context, block
 			}
 		}
 		// Execute the transaction and flush any traces to disk
-		vmenv := vm.NewEVM(vmctx, statedb, api.config, vmConf)
+		vmenv := vm.NewEVM(vmctx, statedb, api.eth.blockchain.Config(), vmConf)
 		_, _, _, err = core.ApplyMessage(vmenv, msg, new(core.GasPool).AddGas(msg.Gas()))
 		if writer != nil {
 			writer.Flush()
@@ -756,7 +756,7 @@ func (api *PrivateDebugAPI) traceTx(ctx context.Context, message core.Message, v
 		tracer = vm.NewStructLogger(config.LogConfig)
 	}
 	// Run the transaction with tracing enabled.
-	vmenv := vm.NewEVM(vmctx, statedb, api.config, vm.Config{Debug: true, Tracer: tracer})
+	vmenv := vm.NewEVM(vmctx, statedb, api.eth.blockchain.Config(), vm.Config{Debug: true, Tracer: tracer})
 
 	ret, gas, failed, err := core.ApplyMessage(vmenv, message, new(core.GasPool).AddGas(message.Gas()))
 	if err != nil {
@@ -796,7 +796,7 @@ func (api *PrivateDebugAPI) computeTxEnv(blockHash common.Hash, txIndex int, ree
 		return nil, vm.Context{}, nil, err
 	}
 	// Recompute transactions up to the target index.
-	signer := types.MakeSigner(api.config, block.Number())
+	signer := types.MakeSigner(api.eth.blockchain.Config(), block.Number())
 
 	for idx, tx := range block.Transactions() {
 		// Assemble the transaction call message and return if the requested offset
@@ -806,7 +806,7 @@ func (api *PrivateDebugAPI) computeTxEnv(blockHash common.Hash, txIndex int, ree
 			return msg, context, statedb, nil
 		}
 		// Not yet the searched for transaction, execute on top of the current state
-		vmenv := vm.NewEVM(context, statedb, api.config, vm.Config{})
+		vmenv := vm.NewEVM(context, statedb, api.eth.blockchain.Config(), vm.Config{})
 		if _, _, _, err := core.ApplyMessage(vmenv, msg, new(core.GasPool).AddGas(tx.Gas())); err != nil {
 			return nil, vm.Context{}, nil, fmt.Errorf("transaction %#x failed: %v", tx.Hash(), err)
 		}
diff --git a/eth/backend.go b/eth/backend.go
index 07c14163d4..ac2f903e86 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -61,8 +61,7 @@ type LesServer interface {
 
 // Ethereum implements the Ethereum full node service.
 type Ethereum struct {
-	config      *Config
-	chainConfig *params.ChainConfig
+	config *Config
 
 	// Channel for shutting down the service
 	shutdownChan chan bool // Channel for shutting down the Ethereum
@@ -134,7 +133,6 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 	eth := &Ethereum{
 		config:         config,
 		chainDb:        chainDb,
-		chainConfig:    chainConfig,
 		eventMux:       ctx.EventMux,
 		accountManager: ctx.AccountManager,
 		engine:         CreateConsensusEngine(ctx, chainConfig, &config.Ethash, config.MinerNotify, config.MinerNoverify, chainDb),
@@ -169,7 +167,7 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 		}
 		cacheConfig = &core.CacheConfig{Disabled: config.NoPruning, TrieCleanLimit: config.TrieCleanCache, TrieDirtyLimit: config.TrieDirtyCache, TrieTimeLimit: config.TrieTimeout}
 	)
-	eth.blockchain, err = core.NewBlockChain(chainDb, cacheConfig, eth.chainConfig, eth.engine, vmConfig, eth.shouldPreserve)
+	eth.blockchain, err = core.NewBlockChain(chainDb, cacheConfig, chainConfig, eth.engine, vmConfig, eth.shouldPreserve)
 	if err != nil {
 		return nil, err
 	}
@@ -184,13 +182,13 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 	if config.TxPool.Journal != "" {
 		config.TxPool.Journal = ctx.ResolvePath(config.TxPool.Journal)
 	}
-	eth.txPool = core.NewTxPool(config.TxPool, eth.chainConfig, eth.blockchain)
+	eth.txPool = core.NewTxPool(config.TxPool, chainConfig, eth.blockchain)
 
-	if eth.protocolManager, err = NewProtocolManager(eth.chainConfig, config.SyncMode, config.NetworkId, eth.eventMux, eth.txPool, eth.engine, eth.blockchain, chainDb, config.Whitelist); err != nil {
+	if eth.protocolManager, err = NewProtocolManager(chainConfig, config.SyncMode, config.NetworkId, eth.eventMux, eth.txPool, eth.engine, eth.blockchain, chainDb, config.Whitelist); err != nil {
 		return nil, err
 	}
 
-	eth.miner = miner.New(eth, eth.chainConfig, eth.EventMux(), eth.engine, config.MinerRecommit, config.MinerGasFloor, config.MinerGasCeil, eth.isLocalBlock)
+	eth.miner = miner.New(eth, chainConfig, eth.EventMux(), eth.engine, config.MinerRecommit, config.MinerGasFloor, config.MinerGasCeil, eth.isLocalBlock)
 	eth.miner.SetExtra(makeExtraData(config.MinerExtraData))
 
 	eth.APIBackend = &EthAPIBackend{eth, nil}
@@ -302,7 +300,7 @@ func (s *Ethereum) APIs() []rpc.API {
 		}, {
 			Namespace: "debug",
 			Version:   "1.0",
-			Service:   NewPrivateDebugAPI(s.chainConfig, s),
+			Service:   NewPrivateDebugAPI(s),
 		}, {
 			Namespace: "net",
 			Version:   "1.0",