diff --git a/pkg/core/blockchain.go b/pkg/core/blockchain.go
index 03622aa9c..a20a6a5f1 100644
--- a/pkg/core/blockchain.go
+++ b/pkg/core/blockchain.go
@@ -464,7 +464,7 @@ func (bc *Blockchain) storeBlock(block *Block) error {
 func (bc *Blockchain) persist(ctx context.Context) error {
 	var (
 		start     = time.Now()
-		persisted = 0
+		persisted int
 		err       error
 	)
 
diff --git a/pkg/core/contract_state_test.go b/pkg/core/contract_state_test.go
index 1507ec566..9ab2e8233 100644
--- a/pkg/core/contract_state_test.go
+++ b/pkg/core/contract_state_test.go
@@ -18,7 +18,7 @@ func TestEncodeDecodeContractState(t *testing.T) {
 		ParamList:   []smartcontract.ParamType{smartcontract.StringType, smartcontract.IntegerType, smartcontract.Hash160Type},
 		ReturnType:  smartcontract.BoolType,
 		Properties:  smartcontract.HasStorage,
-		Name:        "Contracto",
+		Name:        "Contrato",
 		CodeVersion: "1.0.0",
 		Author:      "Joe Random",
 		Email:       "joe@example.com",
@@ -61,7 +61,7 @@ func TestPutGetDeleteContractState(t *testing.T) {
 		ParamList:   []smartcontract.ParamType{smartcontract.StringType, smartcontract.IntegerType, smartcontract.Hash160Type},
 		ReturnType:  smartcontract.BoolType,
 		Properties:  smartcontract.HasStorage,
-		Name:        "Contracto",
+		Name:        "Contrato",
 		CodeVersion: "1.0.0",
 		Author:      "Joe Random",
 		Email:       "joe@example.com",
diff --git a/pkg/core/interop_neo.go b/pkg/core/interop_neo.go
index 19d9247cf..0dc9a1a75 100644
--- a/pkg/core/interop_neo.go
+++ b/pkg/core/interop_neo.go
@@ -417,7 +417,7 @@ func (ic *interopContext) storageFind(v *vm.VM) error {
 */
 // createContractStateFromVM pops all contract state elements from the VM
 // evaluation stack, does a lot of checks and returns ContractState if it
-// succeedes.
+// succeeds.
 func (ic *interopContext) createContractStateFromVM(v *vm.VM) (*ContractState, error) {
 	if ic.trigger != 0x10 {
 		return nil, errors.New("can't create contract when not triggered by an application")
diff --git a/pkg/core/storage/leveldb_store.go b/pkg/core/storage/leveldb_store.go
index b2637744e..31cf8d40b 100644
--- a/pkg/core/storage/leveldb_store.go
+++ b/pkg/core/storage/leveldb_store.go
@@ -21,7 +21,7 @@ type LevelDBStore struct {
 // NewLevelDBStore return a new LevelDBStore object that will
 // initialize the database found at the given path.
 func NewLevelDBStore(cfg LevelDBOptions) (*LevelDBStore, error) {
-	var opts *opt.Options = nil // should be exposed via LevelDBOptions if anything needed
+	var opts *opt.Options // should be exposed via LevelDBOptions if anything needed
 
 	db, err := leveldb.OpenFile(cfg.DataDirectoryPath, opts)
 	if err != nil {
diff --git a/pkg/io/binaryrw_test.go b/pkg/io/binaryrw_test.go
index dc69a92c4..1c147f8bf 100644
--- a/pkg/io/binaryrw_test.go
+++ b/pkg/io/binaryrw_test.go
@@ -22,7 +22,7 @@ func TestWriteLE(t *testing.T) {
 	var (
 		val     uint32 = 0xdeadbeef
 		readval uint32
-		bin     []byte = []byte{0xef, 0xbe, 0xad, 0xde}
+		bin     = []byte{0xef, 0xbe, 0xad, 0xde}
 	)
 	bw := NewBufBinWriter()
 	bw.WriteLE(val)
@@ -39,7 +39,7 @@ func TestWriteBE(t *testing.T) {
 	var (
 		val     uint32 = 0xdeadbeef
 		readval uint32
-		bin     []byte = []byte{0xde, 0xad, 0xbe, 0xef}
+		bin     = []byte{0xde, 0xad, 0xbe, 0xef}
 	)
 	bw := NewBufBinWriter()
 	bw.WriteBE(val)
@@ -115,7 +115,7 @@ func TestBufBinWriterReset(t *testing.T) {
 
 func TestWriteString(t *testing.T) {
 	var (
-		str string = "teststring"
+		str = "teststring"
 	)
 	bw := NewBufBinWriter()
 	bw.WriteString(str)
diff --git a/pkg/network/discovery.go b/pkg/network/discovery.go
index cbc6464a5..7d3415a6f 100644
--- a/pkg/network/discovery.go
+++ b/pkg/network/discovery.go
@@ -115,7 +115,7 @@ func (d *DefaultDiscovery) BadPeers() []string {
 }
 
 // GoodPeers returns all addresses of known good peers (that at least once
-// succeded handshaking with us).
+// succeeded handshaking with us).
 func (d *DefaultDiscovery) GoodPeers() []string {
 	addrs := make([]string, 0, len(d.goodAddrs))
 	for addr := range d.goodAddrs {
@@ -125,7 +125,7 @@ func (d *DefaultDiscovery) GoodPeers() []string {
 }
 
 // RegisterGoodAddr registers good known connected address that passed
-// handshake successfuly.
+// handshake successfully.
 func (d *DefaultDiscovery) RegisterGoodAddr(s string) {
 	d.goodCh <- s
 }
diff --git a/pkg/network/payload/address.go b/pkg/network/payload/address.go
index eae7bc670..47c7b8b5b 100644
--- a/pkg/network/payload/address.go
+++ b/pkg/network/payload/address.go
@@ -45,7 +45,7 @@ func (p *AddressAndTime) EncodeBinary(bw *io.BinWriter) {
 
 // IPPortString makes a string from IP and port specified.
 func (p *AddressAndTime) IPPortString() string {
-	var netip net.IP = make(net.IP, 16)
+	var netip = make(net.IP, 16)
 
 	copy(netip, p.IP[:])
 	port := strconv.Itoa(int(p.Port))