diff --git a/accounts/abi/reflect_test.go b/accounts/abi/reflect_test.go
index bac4cd9530..cf13a79da8 100644
--- a/accounts/abi/reflect_test.go
+++ b/accounts/abi/reflect_test.go
@@ -202,12 +202,12 @@ func TestConvertType(t *testing.T) {
 	fields = append(fields, reflect.StructField{
 		Name: "X",
 		Type: reflect.TypeOf(new(big.Int)),
-		Tag:  reflect.StructTag("json:\"" + "x" + "\""),
+		Tag:  "json:\"" + "x" + "\"",
 	})
 	fields = append(fields, reflect.StructField{
 		Name: "Y",
 		Type: reflect.TypeOf(new(big.Int)),
-		Tag:  reflect.StructTag("json:\"" + "y" + "\""),
+		Tag:  "json:\"" + "y" + "\"",
 	})
 	val := reflect.New(reflect.StructOf(fields))
 	val.Elem().Field(0).Set(reflect.ValueOf(big.NewInt(1)))
diff --git a/accounts/abi/type_test.go b/accounts/abi/type_test.go
index 48df3aa383..8c3aedca6a 100644
--- a/accounts/abi/type_test.go
+++ b/accounts/abi/type_test.go
@@ -255,7 +255,7 @@ func TestTypeCheck(t *testing.T) {
 		{"bytes", nil, [2]byte{0, 1}, "abi: cannot use array as type slice as argument"},
 		{"bytes", nil, common.Hash{1}, "abi: cannot use array as type slice as argument"},
 		{"string", nil, "hello world", ""},
-		{"string", nil, string(""), ""},
+		{"string", nil, "", ""},
 		{"string", nil, []byte{}, "abi: cannot use slice as type string as argument"},
 		{"bytes32[]", nil, [][32]byte{{}}, ""},
 		{"function", nil, [24]byte{}, ""},
diff --git a/accounts/accounts.go b/accounts/accounts.go
index dc85cba174..08a1f0f2b1 100644
--- a/accounts/accounts.go
+++ b/accounts/accounts.go
@@ -21,7 +21,7 @@ import (
 	"fmt"
 	"math/big"
 
-	ethereum "github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/event"
diff --git a/accounts/keystore/passphrase.go b/accounts/keystore/passphrase.go
index 89cdf0bfca..dd4d7764e4 100644
--- a/accounts/keystore/passphrase.go
+++ b/accounts/keystore/passphrase.go
@@ -230,7 +230,7 @@ func DecryptKey(keyjson []byte, auth string) (*Key, error) {
 	key := crypto.ToECDSAUnsafe(keyBytes)
 
 	return &Key{
-		Id:         uuid.UUID(keyId),
+		Id:         keyId,
 		Address:    crypto.PubkeyToAddress(key.PublicKey),
 		PrivateKey: key,
 	}, nil
diff --git a/accounts/keystore/wallet.go b/accounts/keystore/wallet.go
index 498067d497..fe9d2fe49f 100644
--- a/accounts/keystore/wallet.go
+++ b/accounts/keystore/wallet.go
@@ -19,7 +19,7 @@ package keystore
 import (
 	"math/big"
 
-	ethereum "github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
diff --git a/accounts/scwallet/wallet.go b/accounts/scwallet/wallet.go
index 85fae8c114..6476646d7f 100644
--- a/accounts/scwallet/wallet.go
+++ b/accounts/scwallet/wallet.go
@@ -33,7 +33,7 @@ import (
 	"sync"
 	"time"
 
-	ethereum "github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
diff --git a/accounts/usbwallet/wallet.go b/accounts/usbwallet/wallet.go
index e39c6bdf34..9f74e5554f 100644
--- a/accounts/usbwallet/wallet.go
+++ b/accounts/usbwallet/wallet.go
@@ -25,7 +25,7 @@ import (
 	"sync"
 	"time"
 
-	ethereum "github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
diff --git a/cmd/clef/main.go b/cmd/clef/main.go
index 3207042a6c..273919cb41 100644
--- a/cmd/clef/main.go
+++ b/cmd/clef/main.go
@@ -54,7 +54,7 @@ import (
 	"github.com/ethereum/go-ethereum/signer/rules"
 	"github.com/ethereum/go-ethereum/signer/storage"
 
-	colorable "github.com/mattn/go-colorable"
+	"github.com/mattn/go-colorable"
 	"github.com/mattn/go-isatty"
 	"gopkg.in/urfave/cli.v1"
 )
diff --git a/cmd/devp2p/dnscmd.go b/cmd/devp2p/dnscmd.go
index 13110f21c6..f56f0f34e4 100644
--- a/cmd/devp2p/dnscmd.go
+++ b/cmd/devp2p/dnscmd.go
@@ -30,7 +30,7 @@ import (
 	"github.com/ethereum/go-ethereum/console/prompt"
 	"github.com/ethereum/go-ethereum/p2p/dnsdisc"
 	"github.com/ethereum/go-ethereum/p2p/enode"
-	cli "gopkg.in/urfave/cli.v1"
+	"gopkg.in/urfave/cli.v1"
 )
 
 var (
diff --git a/cmd/evm/compiler.go b/cmd/evm/compiler.go
index c019a2fe70..40ad9313c5 100644
--- a/cmd/evm/compiler.go
+++ b/cmd/evm/compiler.go
@@ -23,7 +23,7 @@ import (
 
 	"github.com/ethereum/go-ethereum/cmd/evm/internal/compiler"
 
-	cli "gopkg.in/urfave/cli.v1"
+	"gopkg.in/urfave/cli.v1"
 )
 
 var compileCommand = cli.Command{
diff --git a/cmd/evm/disasm.go b/cmd/evm/disasm.go
index 5bc743aa88..68a09cbf50 100644
--- a/cmd/evm/disasm.go
+++ b/cmd/evm/disasm.go
@@ -23,7 +23,7 @@ import (
 	"strings"
 
 	"github.com/ethereum/go-ethereum/core/asm"
-	cli "gopkg.in/urfave/cli.v1"
+	"gopkg.in/urfave/cli.v1"
 )
 
 var disasmCommand = cli.Command{
diff --git a/cmd/evm/runner.go b/cmd/evm/runner.go
index d0be6ca1e1..4063767cb8 100644
--- a/cmd/evm/runner.go
+++ b/cmd/evm/runner.go
@@ -38,7 +38,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/vm/runtime"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/params"
-	cli "gopkg.in/urfave/cli.v1"
+	"gopkg.in/urfave/cli.v1"
 )
 
 var runCommand = cli.Command{
diff --git a/cmd/evm/staterunner.go b/cmd/evm/staterunner.go
index f9a6b06b8f..c4df936c75 100644
--- a/cmd/evm/staterunner.go
+++ b/cmd/evm/staterunner.go
@@ -28,7 +28,7 @@ import (
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/tests"
 
-	cli "gopkg.in/urfave/cli.v1"
+	"gopkg.in/urfave/cli.v1"
 )
 
 var stateTestCommand = cli.Command{
diff --git a/cmd/geth/config.go b/cmd/geth/config.go
index 6b51843aa4..bf1fc55b17 100644
--- a/cmd/geth/config.go
+++ b/cmd/geth/config.go
@@ -24,7 +24,7 @@ import (
 	"reflect"
 	"unicode"
 
-	cli "gopkg.in/urfave/cli.v1"
+	"gopkg.in/urfave/cli.v1"
 
 	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/eth"
diff --git a/cmd/geth/main.go b/cmd/geth/main.go
index aa6881bab0..0f50989208 100644
--- a/cmd/geth/main.go
+++ b/cmd/geth/main.go
@@ -42,7 +42,7 @@ import (
 	"github.com/ethereum/go-ethereum/metrics"
 	"github.com/ethereum/go-ethereum/node"
 	gopsutil "github.com/shirou/gopsutil/mem"
-	cli "gopkg.in/urfave/cli.v1"
+	"gopkg.in/urfave/cli.v1"
 )
 
 const (
diff --git a/cmd/geth/usage.go b/cmd/geth/usage.go
index a9b6f53e72..0e70451ed3 100644
--- a/cmd/geth/usage.go
+++ b/cmd/geth/usage.go
@@ -25,7 +25,7 @@ import (
 	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/internal/debug"
 	"github.com/ethereum/go-ethereum/internal/flags"
-	cli "gopkg.in/urfave/cli.v1"
+	"gopkg.in/urfave/cli.v1"
 )
 
 // AppHelpFlagGroups is the application flags, grouped by functionality.
diff --git a/cmd/puppeth/genesis.go b/cmd/puppeth/genesis.go
index b3e1709dbf..46268ec11b 100644
--- a/cmd/puppeth/genesis.go
+++ b/cmd/puppeth/genesis.go
@@ -152,7 +152,7 @@ func newAlethGenesisSpec(network string, genesis *core.Genesis) (*alethGenesisSp
 	spec.Genesis.Author = genesis.Coinbase
 	spec.Genesis.Timestamp = (hexutil.Uint64)(genesis.Timestamp)
 	spec.Genesis.ParentHash = genesis.ParentHash
-	spec.Genesis.ExtraData = (hexutil.Bytes)(genesis.ExtraData)
+	spec.Genesis.ExtraData = genesis.ExtraData
 	spec.Genesis.GasLimit = (hexutil.Uint64)(genesis.GasLimit)
 
 	for address, account := range genesis.Alloc {
@@ -430,7 +430,7 @@ func newParityChainSpec(network string, genesis *core.Genesis, bootnodes []strin
 	spec.Genesis.Author = genesis.Coinbase
 	spec.Genesis.Timestamp = (hexutil.Uint64)(genesis.Timestamp)
 	spec.Genesis.ParentHash = genesis.ParentHash
-	spec.Genesis.ExtraData = (hexutil.Bytes)(genesis.ExtraData)
+	spec.Genesis.ExtraData = genesis.ExtraData
 	spec.Genesis.GasLimit = (hexutil.Uint64)(genesis.GasLimit)
 
 	spec.Accounts = make(map[common.UnprefixedAddress]*parityChainSpecAccount)
diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index 26dbb9faf3..56880768f9 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -64,7 +64,7 @@ import (
 	"github.com/ethereum/go-ethereum/p2p/netutil"
 	"github.com/ethereum/go-ethereum/params"
 	pcsclite "github.com/gballet/go-libpcsclite"
-	cli "gopkg.in/urfave/cli.v1"
+	"gopkg.in/urfave/cli.v1"
 )
 
 func init() {
diff --git a/common/hexutil/json_test.go b/common/hexutil/json_test.go
index 8a6b8643a1..ed7d6fad1a 100644
--- a/common/hexutil/json_test.go
+++ b/common/hexutil/json_test.go
@@ -88,7 +88,7 @@ func TestUnmarshalBytes(t *testing.T) {
 		if !checkError(t, test.input, err, test.wantErr) {
 			continue
 		}
-		if !bytes.Equal(test.want.([]byte), []byte(v)) {
+		if !bytes.Equal(test.want.([]byte), v) {
 			t.Errorf("input %s: value mismatch: got %x, want %x", test.input, &v, test.want)
 			continue
 		}
diff --git a/consensus/ethash/ethash.go b/consensus/ethash/ethash.go
index aa3f002c0d..550d99893d 100644
--- a/consensus/ethash/ethash.go
+++ b/consensus/ethash/ethash.go
@@ -33,7 +33,7 @@ import (
 	"time"
 	"unsafe"
 
-	mmap "github.com/edsrzf/mmap-go"
+	"github.com/edsrzf/mmap-go"
 	"github.com/ethereum/go-ethereum/consensus"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/metrics"
diff --git a/contracts/checkpointoracle/oracle.go b/contracts/checkpointoracle/oracle.go
index 1f273272ab..7f3127d0b8 100644
--- a/contracts/checkpointoracle/oracle.go
+++ b/contracts/checkpointoracle/oracle.go
@@ -65,7 +65,7 @@ func (oracle *CheckpointOracle) LookupCheckpointEvents(blockLogs [][]*types.Log,
 			if err != nil {
 				continue
 			}
-			if event.Index == section && common.Hash(event.CheckpointHash) == hash {
+			if event.Index == section && event.CheckpointHash == hash {
 				votes = append(votes, event)
 			}
 		}
diff --git a/core/state/statedb.go b/core/state/statedb.go
index fe30f595ed..ed9a82379f 100644
--- a/core/state/statedb.go
+++ b/core/state/statedb.go
@@ -318,7 +318,7 @@ func (s *StateDB) GetState(addr common.Address, hash common.Hash) common.Hash {
 func (s *StateDB) GetProof(a common.Address) ([][]byte, error) {
 	var proof proofList
 	err := s.trie.Prove(crypto.Keccak256(a.Bytes()), 0, &proof)
-	return [][]byte(proof), err
+	return proof, err
 }
 
 // GetStorageProof returns the StorageProof for given key
@@ -329,7 +329,7 @@ func (s *StateDB) GetStorageProof(a common.Address, key common.Hash) ([][]byte,
 		return proof, errors.New("storage trie for requested address does not exist")
 	}
 	err := trie.Prove(crypto.Keccak256(key.Bytes()), 0, &proof)
-	return [][]byte(proof), err
+	return proof, err
 }
 
 // GetCommittedState retrieves a value from the given account's committed storage trie.
diff --git a/core/tx_pool_test.go b/core/tx_pool_test.go
index 4fca734e65..dbc49d4f9c 100644
--- a/core/tx_pool_test.go
+++ b/core/tx_pool_test.go
@@ -1139,7 +1139,7 @@ func TestTransactionAllowedTxSize(t *testing.T) {
 		t.Fatalf("expected rejection on slightly oversize transaction")
 	}
 	// Try adding a transaction of random not allowed size
-	if err := pool.addRemoteSync(pricedDataTransaction(2, pool.currentMaxGas, big.NewInt(1), key, dataSize+1+uint64(rand.Intn(int(10*txMaxSize))))); err == nil {
+	if err := pool.addRemoteSync(pricedDataTransaction(2, pool.currentMaxGas, big.NewInt(1), key, dataSize+1+uint64(rand.Intn(10*txMaxSize)))); err == nil {
 		t.Fatalf("expected rejection on oversize transaction")
 	}
 	// Run some sanity checks on the pool internals
diff --git a/core/vm/evm.go b/core/vm/evm.go
index 6c7b2370a5..9afef76643 100644
--- a/core/vm/evm.go
+++ b/core/vm/evm.go
@@ -525,7 +525,7 @@ func (evm *EVM) Create(caller ContractRef, code []byte, gas uint64, value *big.I
 // instead of the usual sender-and-nonce-hash as the address where the contract is initialized at.
 func (evm *EVM) Create2(caller ContractRef, code []byte, gas uint64, endowment *big.Int, salt *uint256.Int) (ret []byte, contractAddr common.Address, leftOverGas uint64, err error) {
 	codeAndHash := &codeAndHash{code: code}
-	contractAddr = crypto.CreateAddress2(caller.Address(), common.Hash(salt.Bytes32()), codeAndHash.Hash().Bytes())
+	contractAddr = crypto.CreateAddress2(caller.Address(), salt.Bytes32(), codeAndHash.Hash().Bytes())
 	return evm.create(caller, codeAndHash, gas, endowment, contractAddr)
 }
 
diff --git a/core/vm/gas_table.go b/core/vm/gas_table.go
index 01249a5388..944b6cf0a5 100644
--- a/core/vm/gas_table.go
+++ b/core/vm/gas_table.go
@@ -96,7 +96,7 @@ var (
 func gasSStore(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) {
 	var (
 		y, x    = stack.Back(1), stack.Back(0)
-		current = evm.StateDB.GetState(contract.Address(), common.Hash(x.Bytes32()))
+		current = evm.StateDB.GetState(contract.Address(), x.Bytes32())
 	)
 	// The legacy gas metering only takes into consideration the current state
 	// Legacy rules should be applied if we are in Petersburg (removal of EIP-1283)
@@ -135,7 +135,7 @@ func gasSStore(evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySi
 	if current == value { // noop (1)
 		return params.NetSstoreNoopGas, nil
 	}
-	original := evm.StateDB.GetCommittedState(contract.Address(), common.Hash(x.Bytes32()))
+	original := evm.StateDB.GetCommittedState(contract.Address(), x.Bytes32())
 	if original == current {
 		if original == (common.Hash{}) { // create slot (2.1.1)
 			return params.NetSstoreInitGas, nil
@@ -183,14 +183,14 @@ func gasSStoreEIP2200(evm *EVM, contract *Contract, stack *Stack, mem *Memory, m
 	// Gas sentry honoured, do the actual gas calculation based on the stored value
 	var (
 		y, x    = stack.Back(1), stack.Back(0)
-		current = evm.StateDB.GetState(contract.Address(), common.Hash(x.Bytes32()))
+		current = evm.StateDB.GetState(contract.Address(), x.Bytes32())
 	)
 	value := common.Hash(y.Bytes32())
 
 	if current == value { // noop (1)
 		return params.SloadGasEIP2200, nil
 	}
-	original := evm.StateDB.GetCommittedState(contract.Address(), common.Hash(x.Bytes32()))
+	original := evm.StateDB.GetCommittedState(contract.Address(), x.Bytes32())
 	if original == current {
 		if original == (common.Hash{}) { // create slot (2.1.1)
 			return params.SstoreSetGasEIP2200, nil
diff --git a/core/vm/instructions.go b/core/vm/instructions.go
index 4ded0239d9..1137505292 100644
--- a/core/vm/instructions.go
+++ b/core/vm/instructions.go
@@ -341,7 +341,7 @@ func opReturnDataCopy(pc *uint64, interpreter *EVMInterpreter, callContext *call
 
 func opExtCodeSize(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx) ([]byte, error) {
 	slot := callContext.stack.peek()
-	slot.SetUint64(uint64(interpreter.evm.StateDB.GetCodeSize(common.Address(slot.Bytes20()))))
+	slot.SetUint64(uint64(interpreter.evm.StateDB.GetCodeSize(slot.Bytes20())))
 	return nil, nil
 }
 
@@ -517,7 +517,7 @@ func opSstore(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx) ([]
 	loc := callContext.stack.pop()
 	val := callContext.stack.pop()
 	interpreter.evm.StateDB.SetState(callContext.contract.Address(),
-		common.Hash(loc.Bytes32()), common.Hash(val.Bytes32()))
+		loc.Bytes32(), val.Bytes32())
 	return nil, nil
 }
 
@@ -817,7 +817,7 @@ func opStop(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx) ([]by
 func opSuicide(pc *uint64, interpreter *EVMInterpreter, callContext *callCtx) ([]byte, error) {
 	beneficiary := callContext.stack.pop()
 	balance := interpreter.evm.StateDB.GetBalance(callContext.contract.Address())
-	interpreter.evm.StateDB.AddBalance(common.Address(beneficiary.Bytes20()), balance)
+	interpreter.evm.StateDB.AddBalance(beneficiary.Bytes20(), balance)
 	interpreter.evm.StateDB.Suicide(callContext.contract.Address())
 	return nil, nil
 }
@@ -832,7 +832,7 @@ func makeLog(size int) executionFunc {
 		mStart, mSize := stack.pop(), stack.pop()
 		for i := 0; i < size; i++ {
 			addr := stack.pop()
-			topics[i] = common.Hash(addr.Bytes32())
+			topics[i] = addr.Bytes32()
 		}
 
 		d := callContext.memory.GetCopy(int64(mStart.Uint64()), int64(mSize.Uint64()))
diff --git a/core/vm/operations_acl.go b/core/vm/operations_acl.go
index 41b0549c51..191953ce5e 100644
--- a/core/vm/operations_acl.go
+++ b/core/vm/operations_acl.go
@@ -73,7 +73,7 @@ func gasSStoreEIP2929(evm *EVM, contract *Contract, stack *Stack, mem *Memory, m
 		//		return params.SloadGasEIP2200, nil
 		return cost + WarmStorageReadCostEIP2929, nil // SLOAD_GAS
 	}
-	original := evm.StateDB.GetCommittedState(contract.Address(), common.Hash(x.Bytes32()))
+	original := evm.StateDB.GetCommittedState(contract.Address(), x.Bytes32())
 	if original == current {
 		if original == (common.Hash{}) { // create slot (2.1.1)
 			return cost + params.SstoreSetGasEIP2200, nil
diff --git a/eth/downloader/api.go b/eth/downloader/api.go
index 57ff3d71af..2024d23dea 100644
--- a/eth/downloader/api.go
+++ b/eth/downloader/api.go
@@ -20,7 +20,7 @@ import (
 	"context"
 	"sync"
 
-	ethereum "github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/rpc"
 )
diff --git a/eth/filters/api.go b/eth/filters/api.go
index 30d7b71c31..664f229a04 100644
--- a/eth/filters/api.go
+++ b/eth/filters/api.go
@@ -25,7 +25,7 @@ import (
 	"sync"
 	"time"
 
-	ethereum "github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/core/types"
@@ -292,7 +292,7 @@ func (api *PublicFilterAPI) NewFilter(crit FilterCriteria) (rpc.ID, error) {
 	logs := make(chan []*types.Log)
 	logsSub, err := api.events.SubscribeLogs(ethereum.FilterQuery(crit), logs)
 	if err != nil {
-		return rpc.ID(""), err
+		return "", err
 	}
 
 	api.filtersMu.Lock()
diff --git a/eth/filters/filter_system.go b/eth/filters/filter_system.go
index a105ec51c3..12f037d0f9 100644
--- a/eth/filters/filter_system.go
+++ b/eth/filters/filter_system.go
@@ -24,7 +24,7 @@ import (
 	"sync"
 	"time"
 
-	ethereum "github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/rawdb"
diff --git a/eth/filters/filter_system_test.go b/eth/filters/filter_system_test.go
index c8d1d43abb..b534c1d47f 100644
--- a/eth/filters/filter_system_test.go
+++ b/eth/filters/filter_system_test.go
@@ -25,7 +25,7 @@ import (
 	"testing"
 	"time"
 
-	ethereum "github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/consensus/ethash"
 	"github.com/ethereum/go-ethereum/core"
diff --git a/eth/tracers/tracer.go b/eth/tracers/tracer.go
index 16a8c7698f..5d806d9026 100644
--- a/eth/tracers/tracer.go
+++ b/eth/tracers/tracer.go
@@ -30,7 +30,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/log"
-	duktape "gopkg.in/olebedev/go-duktape.v3"
+	"gopkg.in/olebedev/go-duktape.v3"
 )
 
 // bigIntegerJS is the minified version of https://github.com/peterolson/BigInteger.js.
diff --git a/event/event_test.go b/event/event_test.go
index cc9fa5d7c8..bdad11f13d 100644
--- a/event/event_test.go
+++ b/event/event_test.go
@@ -29,7 +29,7 @@ func TestSubCloseUnsub(t *testing.T) {
 	// the point of this test is **not** to panic
 	var mux TypeMux
 	mux.Stop()
-	sub := mux.Subscribe(int(0))
+	sub := mux.Subscribe(0)
 	sub.Unsubscribe()
 }
 
diff --git a/event/feed_test.go b/event/feed_test.go
index 93badaaee6..cdf29fdd73 100644
--- a/event/feed_test.go
+++ b/event/feed_test.go
@@ -27,8 +27,8 @@ import (
 func TestFeedPanics(t *testing.T) {
 	{
 		var f Feed
-		f.Send(int(2))
-		want := feedTypeError{op: "Send", got: reflect.TypeOf(uint64(0)), want: reflect.TypeOf(int(0))}
+		f.Send(2)
+		want := feedTypeError{op: "Send", got: reflect.TypeOf(uint64(0)), want: reflect.TypeOf(0)}
 		if err := checkPanic(want, func() { f.Send(uint64(2)) }); err != nil {
 			t.Error(err)
 		}
@@ -37,14 +37,14 @@ func TestFeedPanics(t *testing.T) {
 		var f Feed
 		ch := make(chan int)
 		f.Subscribe(ch)
-		want := feedTypeError{op: "Send", got: reflect.TypeOf(uint64(0)), want: reflect.TypeOf(int(0))}
+		want := feedTypeError{op: "Send", got: reflect.TypeOf(uint64(0)), want: reflect.TypeOf(0)}
 		if err := checkPanic(want, func() { f.Send(uint64(2)) }); err != nil {
 			t.Error(err)
 		}
 	}
 	{
 		var f Feed
-		f.Send(int(2))
+		f.Send(2)
 		want := feedTypeError{op: "Subscribe", got: reflect.TypeOf(make(chan uint64)), want: reflect.TypeOf(make(chan<- int))}
 		if err := checkPanic(want, func() { f.Subscribe(make(chan uint64)) }); err != nil {
 			t.Error(err)
@@ -58,7 +58,7 @@ func TestFeedPanics(t *testing.T) {
 	}
 	{
 		var f Feed
-		if err := checkPanic(errBadChannel, func() { f.Subscribe(int(0)) }); err != nil {
+		if err := checkPanic(errBadChannel, func() { f.Subscribe(0) }); err != nil {
 			t.Error(err)
 		}
 	}
diff --git a/graphql/graphql.go b/graphql/graphql.go
index 559da8aaaa..16a74b4037 100644
--- a/graphql/graphql.go
+++ b/graphql/graphql.go
@@ -77,7 +77,7 @@ func (a *Account) Code(ctx context.Context) (hexutil.Bytes, error) {
 	if err != nil {
 		return hexutil.Bytes{}, err
 	}
-	return hexutil.Bytes(state.GetCode(a.address)), nil
+	return state.GetCode(a.address), nil
 }
 
 func (a *Account) Storage(ctx context.Context, args struct{ Slot common.Hash }) (common.Hash, error) {
@@ -116,7 +116,7 @@ func (l *Log) Topics(ctx context.Context) []common.Hash {
 }
 
 func (l *Log) Data(ctx context.Context) hexutil.Bytes {
-	return hexutil.Bytes(l.log.Data)
+	return l.log.Data
 }
 
 // Transaction represents an Ethereum transaction.
@@ -157,7 +157,7 @@ func (t *Transaction) InputData(ctx context.Context) (hexutil.Bytes, error) {
 	if err != nil || tx == nil {
 		return hexutil.Bytes{}, err
 	}
-	return hexutil.Bytes(tx.Data()), nil
+	return tx.Data(), nil
 }
 
 func (t *Transaction) Gas(ctx context.Context) (hexutil.Uint64, error) {
@@ -410,7 +410,7 @@ func (b *Block) resolveReceipts(ctx context.Context) ([]*types.Receipt, error) {
 		if err != nil {
 			return nil, err
 		}
-		b.receipts = []*types.Receipt(receipts)
+		b.receipts = receipts
 	}
 	return b.receipts, nil
 }
@@ -490,7 +490,7 @@ func (b *Block) Nonce(ctx context.Context) (hexutil.Bytes, error) {
 	if err != nil {
 		return hexutil.Bytes{}, err
 	}
-	return hexutil.Bytes(header.Nonce[:]), nil
+	return header.Nonce[:], nil
 }
 
 func (b *Block) MixHash(ctx context.Context) (common.Hash, error) {
@@ -564,7 +564,7 @@ func (b *Block) ExtraData(ctx context.Context) (hexutil.Bytes, error) {
 	if err != nil {
 		return hexutil.Bytes{}, err
 	}
-	return hexutil.Bytes(header.Extra), nil
+	return header.Extra, nil
 }
 
 func (b *Block) LogsBloom(ctx context.Context) (hexutil.Bytes, error) {
@@ -572,7 +572,7 @@ func (b *Block) LogsBloom(ctx context.Context) (hexutil.Bytes, error) {
 	if err != nil {
 		return hexutil.Bytes{}, err
 	}
-	return hexutil.Bytes(header.Bloom.Bytes()), nil
+	return header.Bloom.Bytes(), nil
 }
 
 func (b *Block) TotalDifficulty(ctx context.Context) (hexutil.Big, error) {
@@ -907,7 +907,7 @@ func (r *Resolver) Block(ctx context.Context, args struct {
 }) (*Block, error) {
 	var block *Block
 	if args.Number != nil {
-		number := rpc.BlockNumber(uint64(*args.Number))
+		number := rpc.BlockNumber(*args.Number)
 		numberOrHash := rpc.BlockNumberOrHashWithNumber(number)
 		block = &Block{
 			backend:      r.backend,
diff --git a/internal/debug/flags.go b/internal/debug/flags.go
index 3b077b6e08..e3a01378ca 100644
--- a/internal/debug/flags.go
+++ b/internal/debug/flags.go
@@ -28,7 +28,7 @@ import (
 	"github.com/ethereum/go-ethereum/metrics"
 	"github.com/ethereum/go-ethereum/metrics/exp"
 	"github.com/fjl/memsize/memsizeui"
-	colorable "github.com/mattn/go-colorable"
+	"github.com/mattn/go-colorable"
 	"github.com/mattn/go-isatty"
 	"gopkg.in/urfave/cli.v1"
 )
diff --git a/internal/ethapi/api.go b/internal/ethapi/api.go
index 0d6ace9b5b..030bdb37a4 100644
--- a/internal/ethapi/api.go
+++ b/internal/ethapi/api.go
@@ -793,7 +793,7 @@ func (args *CallArgs) ToMessage(globalGasCap uint64) types.Message {
 
 	var data []byte
 	if args.Data != nil {
-		data = []byte(*args.Data)
+		data = *args.Data
 	}
 
 	msg := types.NewMessage(addr, args.To, 0, value, gas, gasPrice, data, false)
diff --git a/internal/flags/helpers.go b/internal/flags/helpers.go
index 900fec454c..f61ed4b689 100644
--- a/internal/flags/helpers.go
+++ b/internal/flags/helpers.go
@@ -21,7 +21,7 @@ import (
 	"path/filepath"
 
 	"github.com/ethereum/go-ethereum/params"
-	cli "gopkg.in/urfave/cli.v1"
+	"gopkg.in/urfave/cli.v1"
 )
 
 var (
diff --git a/miner/unconfirmed_test.go b/miner/unconfirmed_test.go
index 42e77f3e64..dc83cb9265 100644
--- a/miner/unconfirmed_test.go
+++ b/miner/unconfirmed_test.go
@@ -19,7 +19,6 @@ package miner
 import (
 	"testing"
 
-	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 )
 
@@ -43,7 +42,7 @@ func TestUnconfirmedInsertBounds(t *testing.T) {
 	for depth := uint64(0); depth < 2*uint64(limit); depth++ {
 		// Insert multiple blocks for the same level just to stress it
 		for i := 0; i < int(depth); i++ {
-			pool.Insert(depth, common.Hash([32]byte{byte(depth), byte(i)}))
+			pool.Insert(depth, [32]byte{byte(depth), byte(i)})
 		}
 		// Validate that no blocks below the depth allowance are left in
 		pool.blocks.Do(func(block interface{}) {
@@ -63,7 +62,7 @@ func TestUnconfirmedShifts(t *testing.T) {
 
 	pool := newUnconfirmedBlocks(new(noopChainRetriever), limit)
 	for depth := start; depth < start+uint64(limit); depth++ {
-		pool.Insert(depth, common.Hash([32]byte{byte(depth)}))
+		pool.Insert(depth, [32]byte{byte(depth)})
 	}
 	// Try to shift below the limit and ensure no blocks are dropped
 	pool.Shift(start + uint64(limit) - 1)
diff --git a/mobile/ethereum.go b/mobile/ethereum.go
index 59da852397..97c46ddca7 100644
--- a/mobile/ethereum.go
+++ b/mobile/ethereum.go
@@ -21,7 +21,7 @@ package geth
 import (
 	"errors"
 
-	ethereum "github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/common"
 )
 
diff --git a/p2p/enode/nodedb.go b/p2p/enode/nodedb.go
index bd066ce857..643fbe5711 100644
--- a/p2p/enode/nodedb.go
+++ b/p2p/enode/nodedb.go
@@ -163,7 +163,7 @@ func splitNodeItemKey(key []byte) (id ID, ip net.IP, field string) {
 	}
 	key = key[len(dbDiscoverRoot)+1:]
 	// Split out the IP.
-	ip = net.IP(key[:16])
+	ip = key[:16]
 	if ip4 := ip.To4(); ip4 != nil {
 		ip = ip4
 	}
diff --git a/signer/core/signed_data.go b/signer/core/signed_data.go
index 19377a521b..3bff1e1f20 100644
--- a/signer/core/signed_data.go
+++ b/signer/core/signed_data.go
@@ -506,7 +506,7 @@ func parseBytes(encType interface{}) ([]byte, bool) {
 	case []byte:
 		return v, true
 	case hexutil.Bytes:
-		return []byte(v), true
+		return v, true
 	case string:
 		bytes, err := hexutil.Decode(v)
 		if err != nil {
diff --git a/trie/database.go b/trie/database.go
index d8fe45f444..7c2f207097 100644
--- a/trie/database.go
+++ b/trie/database.go
@@ -100,7 +100,7 @@ func (n rawNode) cache() (hashNode, bool)   { panic("this should never end up in
 func (n rawNode) fstring(ind string) string { panic("this should never end up in a live trie") }
 
 func (n rawNode) EncodeRLP(w io.Writer) error {
-	_, err := w.Write([]byte(n))
+	_, err := w.Write(n)
 	return err
 }
 
diff --git a/trie/iterator.go b/trie/iterator.go
index bb4025d8f3..76d437c403 100644
--- a/trie/iterator.go
+++ b/trie/iterator.go
@@ -173,7 +173,7 @@ func (it *nodeIterator) LeafKey() []byte {
 func (it *nodeIterator) LeafBlob() []byte {
 	if len(it.stack) > 0 {
 		if node, ok := it.stack[len(it.stack)-1].node.(valueNode); ok {
-			return []byte(node)
+			return node
 		}
 	}
 	panic("not at leaf")