diff --git a/pkg/compiler/codegen.go b/pkg/compiler/codegen.go
index 39b005081..9055abd16 100644
--- a/pkg/compiler/codegen.go
+++ b/pkg/compiler/codegen.go
@@ -898,23 +898,23 @@ func (c *codegen) Visit(node ast.Node) ast.Visitor {
 		c.currentSwitch = label
 
 		ast.Walk(c, n.X)
-		emit.Syscall(c.prog.BinWriter, "Neo.Iterator.Create")
+		emit.Syscall(c.prog.BinWriter, "System.Iterator.Create")
 
 		c.pushStackLabel(label, 1)
 		c.setLabel(start)
 
 		emit.Opcode(c.prog.BinWriter, opcode.DUP)
-		emit.Syscall(c.prog.BinWriter, "Neo.Enumerator.Next")
+		emit.Syscall(c.prog.BinWriter, "System.Enumerator.Next")
 		emit.Jmp(c.prog.BinWriter, opcode.JMPIFNOTL, end)
 
 		if n.Key != nil {
 			emit.Opcode(c.prog.BinWriter, opcode.DUP)
-			emit.Syscall(c.prog.BinWriter, "Neo.Iterator.Key")
+			emit.Syscall(c.prog.BinWriter, "System.Iterator.Key")
 			c.emitStoreVar(n.Key.(*ast.Ident).Name)
 		}
 		if n.Value != nil {
 			emit.Opcode(c.prog.BinWriter, opcode.DUP)
-			emit.Syscall(c.prog.BinWriter, "Neo.Enumerator.Value")
+			emit.Syscall(c.prog.BinWriter, "System.Enumerator.Value")
 			c.emitStoreVar(n.Value.(*ast.Ident).Name)
 		}
 
@@ -1092,7 +1092,7 @@ func (c *codegen) convertBuiltin(expr *ast.CallExpr) {
 			emit.Opcode(c.prog.BinWriter, opcode.THROW)
 		} else if isString(c.typeInfo.Types[arg].Type) {
 			ast.Walk(c, arg)
-			emit.Syscall(c.prog.BinWriter, "Neo.Runtime.Log")
+			emit.Syscall(c.prog.BinWriter, "System.Runtime.Log")
 			emit.Opcode(c.prog.BinWriter, opcode.THROW)
 		} else {
 			c.prog.Err = errors.New("panic should have string or nil argument")
diff --git a/pkg/compiler/panic_test.go b/pkg/compiler/panic_test.go
index e8e506db4..0661f75c0 100644
--- a/pkg/compiler/panic_test.go
+++ b/pkg/compiler/panic_test.go
@@ -55,7 +55,7 @@ func getPanicSource(need bool, message string) string {
 }
 
 func logGetter(logs *[]string) vm.InteropGetterFunc {
-	logID := emit.InteropNameToID([]byte("Neo.Runtime.Log"))
+	logID := emit.InteropNameToID([]byte("System.Runtime.Log"))
 	return func(id uint32) *vm.InteropFuncPrice {
 		if id != logID {
 			return nil
diff --git a/pkg/compiler/syscall.go b/pkg/compiler/syscall.go
index f6bbf3ccf..f4fad18b5 100644
--- a/pkg/compiler/syscall.go
+++ b/pkg/compiler/syscall.go
@@ -1,59 +1,40 @@
 package compiler
 
 var syscalls = map[string]map[string]string{
-	"account": {
-		"GetBalance":    "Neo.Account.GetBalance",
-		"GetScriptHash": "Neo.Account.GetScriptHash",
-		"GetVotes":      "Neo.Account.GetVotes",
-		"IsStandard":    "Neo.Account.IsStandard",
-	},
 	"crypto": {
 		"ECDsaVerify": "Neo.Crypto.ECDsaVerify",
 	},
 	"enumerator": {
-		"Concat": "Neo.Enumerator.Concat",
-		"Create": "Neo.Enumerator.Create",
-		"Next":   "Neo.Enumerator.Next",
-		"Value":  "Neo.Enumerator.Value",
+		"Concat": "System.Enumerator.Concat",
+		"Create": "System.Enumerator.Create",
+		"Next":   "System.Enumerator.Next",
+		"Value":  "System.Enumerator.Value",
 	},
 	"storage": {
-		"ConvertContextToReadOnly": "Neo.StorageContext.AsReadOnly",
-		"Delete":                   "Neo.Storage.Delete",
-		"Find":                     "Neo.Storage.Find",
-		"Get":                      "Neo.Storage.Get",
-		"GetContext":               "Neo.Storage.GetContext",
-		"GetReadOnlyContext":       "Neo.Storage.GetReadOnlyContext",
-		"Put":                      "Neo.Storage.Put",
+		"ConvertContextToReadOnly": "System.Storage.AsReadOnly",
+		"Delete":                   "System.Storage.Delete",
+		"Find":                     "System.Storage.Find",
+		"Get":                      "System.Storage.Get",
+		"GetContext":               "System.Storage.GetContext",
+		"GetReadOnlyContext":       "System.Storage.GetReadOnlyContext",
+		"Put":                      "System.Storage.Put",
 	},
 	"runtime": {
-		"GetTrigger":   "Neo.Runtime.GetTrigger",
-		"CheckWitness": "Neo.Runtime.CheckWitness",
-		"Notify":       "Neo.Runtime.Notify",
-		"Log":          "Neo.Runtime.Log",
-		"GetTime":      "Neo.Runtime.GetTime",
-		"Serialize":    "Neo.Runtime.Serialize",
-		"Deserialize":  "Neo.Runtime.Deserialize",
+		"GetTrigger":   "System.Runtime.GetTrigger",
+		"CheckWitness": "System.Runtime.CheckWitness",
+		"Notify":       "System.Runtime.Notify",
+		"Log":          "System.Runtime.Log",
+		"GetTime":      "System.Runtime.GetTime",
+		"Serialize":    "System.Runtime.Serialize",
+		"Deserialize":  "System.Runtime.Deserialize",
 	},
 	"blockchain": {
-		"GetAccount":              "Neo.Blockchain.GetAccount",
 		"GetBlock":                "System.Blockchain.GetBlock",
-		"GetContract":             "Neo.Blockchain.GetContract",
-		"GetHeader":               "Neo.Blockchain.GetHeader",
-		"GetHeight":               "Neo.Blockchain.GetHeight",
+		"GetContract":             "System.Blockchain.GetContract",
+		"GetHeight":               "System.Blockchain.GetHeight",
 		"GetTransaction":          "System.Blockchain.GetTransaction",
 		"GetTransactionFromBlock": "System.Blockchain.GetTransactionFromBlock",
 		"GetTransactionHeight":    "System.Blockchain.GetTransactionHeight",
-		"GetValidators":           "Neo.Blockchain.GetValidators",
-	},
-	"header": {
-		"GetIndex":         "Neo.Header.GetIndex",
-		"GetHash":          "Neo.Header.GetHash",
-		"GetPrevHash":      "Neo.Header.GetPrevHash",
-		"GetTimestamp":     "Neo.Header.GetTimestamp",
-		"GetVersion":       "Neo.Header.GetVersion",
-		"GetMerkleRoot":    "Neo.Header.GetMerkleRoot",
-		"GetConsensusData": "Neo.Header.GetConsensusData",
-		"GetNextConsensus": "Neo.Header.GetNextConsensus",
 	},
 	"contract": {
 		"GetScript":         "Neo.Contract.GetScript",
@@ -70,15 +51,12 @@ var syscalls = map[string]map[string]string{
 		"GetExecutingScriptHash": "System.ExecutionEngine.GetExecutingScriptHash",
 	},
 	"iterator": {
-		"Concat": "Neo.Iterator.Concat",
-		"Create": "Neo.Iterator.Create",
-		"Key":    "Neo.Iterator.Key",
-		"Keys":   "Neo.Iterator.Keys",
-		"Next":   "Neo.Iterator.Next",
-		"Value":  "Neo.Iterator.Value",
-		"Values": "Neo.Iterator.Values",
-	},
-	"witness": {
-		"GetVerificationScript": "Neo.Witness.GetVerificationScript",
+		"Concat": "System.Iterator.Concat",
+		"Create": "System.Iterator.Create",
+		"Key":    "System.Iterator.Key",
+		"Keys":   "System.Iterator.Keys",
+		"Next":   "System.Enumerator.Next",
+		"Value":  "System.Enumerator.Value",
+		"Values": "System.Iterator.Values",
 	},
 }
diff --git a/pkg/compiler/vm_test.go b/pkg/compiler/vm_test.go
index f841318d2..fab6b6eac 100644
--- a/pkg/compiler/vm_test.go
+++ b/pkg/compiler/vm_test.go
@@ -82,10 +82,10 @@ func newStoragePlugin() *storagePlugin {
 		mem:      make(map[string][]byte),
 		interops: make(map[uint32]vm.InteropFunc),
 	}
-	s.interops[emit.InteropNameToID([]byte("Neo.Storage.Get"))] = s.Get
-	s.interops[emit.InteropNameToID([]byte("Neo.Storage.Put"))] = s.Put
-	s.interops[emit.InteropNameToID([]byte("Neo.Storage.GetContext"))] = s.GetContext
-	s.interops[emit.InteropNameToID([]byte("Neo.Runtime.Notify"))] = s.Notify
+	s.interops[emit.InteropNameToID([]byte("System.Storage.Get"))] = s.Get
+	s.interops[emit.InteropNameToID([]byte("System.Storage.Put"))] = s.Put
+	s.interops[emit.InteropNameToID([]byte("System.Storage.GetContext"))] = s.GetContext
+	s.interops[emit.InteropNameToID([]byte("System.Runtime.Notify"))] = s.Notify
 	return s
 
 }
diff --git a/pkg/core/blockchain_test.go b/pkg/core/blockchain_test.go
index 1b50e88d9..e01dde741 100644
--- a/pkg/core/blockchain_test.go
+++ b/pkg/core/blockchain_test.go
@@ -265,7 +265,7 @@ func TestSubscriptions(t *testing.T) {
 
 	script := io.NewBufBinWriter()
 	emit.Bytes(script.BinWriter, []byte("yay!"))
-	emit.Syscall(script.BinWriter, "Neo.Runtime.Notify")
+	emit.Syscall(script.BinWriter, "System.Runtime.Notify")
 	require.NoError(t, script.Err)
 	txGood1 := transaction.New(script.Bytes(), 0)
 	txGood1.Sender = neoOwner
@@ -276,7 +276,7 @@ func TestSubscriptions(t *testing.T) {
 	// Reset() reuses the script buffer and we need to keep scripts.
 	script = io.NewBufBinWriter()
 	emit.Bytes(script.BinWriter, []byte("nay!"))
-	emit.Syscall(script.BinWriter, "Neo.Runtime.Notify")
+	emit.Syscall(script.BinWriter, "System.Runtime.Notify")
 	emit.Opcode(script.BinWriter, opcode.THROW)
 	require.NoError(t, script.Err)
 	txBad := transaction.New(script.Bytes(), 0)
@@ -287,7 +287,7 @@ func TestSubscriptions(t *testing.T) {
 
 	script = io.NewBufBinWriter()
 	emit.Bytes(script.BinWriter, []byte("yay! yay! yay!"))
-	emit.Syscall(script.BinWriter, "Neo.Runtime.Notify")
+	emit.Syscall(script.BinWriter, "System.Runtime.Notify")
 	require.NoError(t, script.Err)
 	txGood2 := transaction.New(script.Bytes(), 0)
 	txGood2.Sender = neoOwner
diff --git a/pkg/core/interop_neo.go b/pkg/core/interop_neo.go
index d855890f8..a79757cb7 100644
--- a/pkg/core/interop_neo.go
+++ b/pkg/core/interop_neo.go
@@ -8,10 +8,8 @@ import (
 
 	"github.com/nspcc-dev/neo-go/pkg/core/interop"
 	"github.com/nspcc-dev/neo-go/pkg/core/state"
-	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
 	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
 	"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
-	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/nspcc-dev/neo-go/pkg/vm"
 	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
 )
@@ -27,109 +25,6 @@ const (
 	MaxContractStringLen = 252
 )
 
-// headerGetVersion returns version from the header.
-func headerGetVersion(ic *interop.Context, v *vm.VM) error {
-	header, err := popHeaderFromVM(v)
-	if err != nil {
-		return err
-	}
-	v.Estack().PushVal(header.Version)
-	return nil
-}
-
-// headerGetMerkleRoot returns version from the header.
-func headerGetMerkleRoot(ic *interop.Context, v *vm.VM) error {
-	header, err := popHeaderFromVM(v)
-	if err != nil {
-		return err
-	}
-	v.Estack().PushVal(header.MerkleRoot.BytesBE())
-	return nil
-}
-
-// headerGetNextConsensus returns version from the header.
-func headerGetNextConsensus(ic *interop.Context, v *vm.VM) error {
-	header, err := popHeaderFromVM(v)
-	if err != nil {
-		return err
-	}
-	v.Estack().PushVal(header.NextConsensus.BytesBE())
-	return nil
-}
-
-// witnessGetVerificationScript returns current witness' script.
-func witnessGetVerificationScript(ic *interop.Context, v *vm.VM) error {
-	witInterface := v.Estack().Pop().Value()
-	wit, ok := witInterface.(*transaction.Witness)
-	if !ok {
-		return errors.New("value is not a witness")
-	}
-	// It's important not to share wit.VerificationScript slice with the code running in VM.
-	script := make([]byte, len(wit.VerificationScript))
-	copy(script, wit.VerificationScript)
-	v.Estack().PushVal(script)
-	return nil
-}
-
-// bcGetAccount returns or creates an account.
-func bcGetAccount(ic *interop.Context, v *vm.VM) error {
-	accbytes := v.Estack().Pop().Bytes()
-	acchash, err := util.Uint160DecodeBytesBE(accbytes)
-	if err != nil {
-		return err
-	}
-	acc, err := ic.DAO.GetAccountStateOrNew(acchash)
-	if err != nil {
-		return err
-	}
-	v.Estack().PushVal(stackitem.NewInterop(acc))
-	return nil
-}
-
-// accountGetBalance returns balance for a given account.
-func accountGetBalance(ic *interop.Context, v *vm.VM) error {
-	accInterface := v.Estack().Pop().Value()
-	acc, ok := accInterface.(*state.Account)
-	if !ok {
-		return fmt.Errorf("%T is not an account state", acc)
-	}
-	asbytes := v.Estack().Pop().Bytes()
-	ashash, err := util.Uint256DecodeBytesBE(asbytes)
-	if err != nil {
-		return err
-	}
-	balance, ok := acc.GetBalanceValues()[ashash]
-	if !ok {
-		balance = util.Fixed8(0)
-	}
-	v.Estack().PushVal(int64(balance))
-	return nil
-}
-
-// accountGetScriptHash returns script hash of a given account.
-func accountGetScriptHash(ic *interop.Context, v *vm.VM) error {
-	accInterface := v.Estack().Pop().Value()
-	acc, ok := accInterface.(*state.Account)
-	if !ok {
-		return fmt.Errorf("%T is not an account state", acc)
-	}
-	v.Estack().PushVal(acc.ScriptHash.BytesBE())
-	return nil
-}
-
-// accountIsStandard checks whether given account is standard.
-func accountIsStandard(ic *interop.Context, v *vm.VM) error {
-	accbytes := v.Estack().Pop().Bytes()
-	acchash, err := util.Uint160DecodeBytesBE(accbytes)
-	if err != nil {
-		return err
-	}
-	contract, err := ic.DAO.GetContractState(acchash)
-	res := err != nil || vm.IsStandardContract(contract.Script)
-	v.Estack().PushVal(res)
-	return nil
-}
-
 // storageFind finds stored key-value pair.
 func storageFind(ic *interop.Context, v *vm.VM) error {
 	stcInterface := v.Estack().Pop().Value()
diff --git a/pkg/core/interop_neo_test.go b/pkg/core/interop_neo_test.go
index 626e0c5cd..853e9850d 100644
--- a/pkg/core/interop_neo_test.go
+++ b/pkg/core/interop_neo_test.go
@@ -2,7 +2,6 @@ package core
 
 import (
 	"fmt"
-	"math/big"
 	"testing"
 
 	"github.com/nspcc-dev/neo-go/pkg/core/block"
@@ -136,64 +135,6 @@ func TestStorageFind(t *testing.T) {
 	})
 }
 
-func TestHeaderGetVersion(t *testing.T) {
-	v, block, context, chain := createVMAndPushBlock(t)
-	defer chain.Close()
-
-	err := headerGetVersion(context, v)
-	require.NoError(t, err)
-	value := v.Estack().Pop().Value().(*big.Int)
-	require.Equal(t, uint64(block.Version), value.Uint64())
-}
-
-func TestHeaderGetVersion_Negative(t *testing.T) {
-	v := vm.New()
-	block := newDumbBlock()
-	chain := newTestChain(t)
-	defer chain.Close()
-	context := chain.newInteropContext(trigger.Application, dao.NewSimple(storage.NewMemoryStore()), block, nil)
-	v.Estack().PushVal(stackitem.NewBool(false))
-
-	err := headerGetVersion(context, v)
-	require.Errorf(t, err, "value is not a header or block")
-}
-
-func TestHeaderGetMerkleRoot(t *testing.T) {
-	v, block, context, chain := createVMAndPushBlock(t)
-	defer chain.Close()
-
-	err := headerGetMerkleRoot(context, v)
-	require.NoError(t, err)
-	value := v.Estack().Pop().Value()
-	require.Equal(t, block.MerkleRoot.BytesBE(), value)
-}
-
-func TestHeaderGetNextConsensus(t *testing.T) {
-	v, block, context, chain := createVMAndPushBlock(t)
-	defer chain.Close()
-
-	err := headerGetNextConsensus(context, v)
-	require.NoError(t, err)
-	value := v.Estack().Pop().Value()
-	require.Equal(t, block.NextConsensus.BytesBE(), value)
-}
-
-func TestWitnessGetVerificationScript(t *testing.T) {
-	v := vm.New()
-	script := []byte{byte(opcode.PUSHM1), byte(opcode.RET)}
-	witness := transaction.Witness{InvocationScript: nil, VerificationScript: script}
-
-	chain := newTestChain(t)
-	defer chain.Close()
-
-	context := chain.newInteropContext(trigger.Application, dao.NewSimple(storage.NewMemoryStore()), nil, nil)
-	v.Estack().PushVal(stackitem.NewInterop(&witness))
-	err := witnessGetVerificationScript(context, v)
-	require.NoError(t, err)
-	value := v.Estack().Pop().Value().([]byte)
-	require.Equal(t, witness.VerificationScript, value)
-}
-
 func TestECDSAVerify(t *testing.T) {
 	priv, err := keys.NewPrivateKey()
 	require.NoError(t, err)
@@ -270,17 +211,6 @@ func TestECDSAVerify(t *testing.T) {
 	})
 }
 
-func TestAccountGetScriptHash(t *testing.T) {
-	v, accState, context, chain := createVMAndAccState(t)
-	defer chain.Close()
-	v.Estack().PushVal(stackitem.NewInterop(accState))
-
-	err := accountGetScriptHash(context, v)
-	require.NoError(t, err)
-	hash := v.Estack().Pop().Value()
-	require.Equal(t, accState.ScriptHash.BytesBE(), hash)
-}
-
 func TestContractGetScript(t *testing.T) {
 	v, contractState, context, chain := createVMAndContractState(t)
 	defer chain.Close()
diff --git a/pkg/core/interop_system.go b/pkg/core/interop_system.go
index 9a30fbaf8..2c4f6335e 100644
--- a/pkg/core/interop_system.go
+++ b/pkg/core/interop_system.go
@@ -98,21 +98,6 @@ func bcGetContract(ic *interop.Context, v *vm.VM) error {
 	return nil
 }
 
-// bcGetHeader returns block header.
-func bcGetHeader(ic *interop.Context, v *vm.VM) error {
-	hash, err := getBlockHashFromElement(ic.Chain, v.Estack().Pop())
-	if err != nil {
-		return err
-	}
-	header, err := ic.Chain.GetHeader(hash)
-	if err != nil {
-		v.Estack().PushVal([]byte{})
-	} else {
-		v.Estack().PushVal(stackitem.NewInterop(header))
-	}
-	return nil
-}
-
 // bcGetHeight returns blockchain height.
 func bcGetHeight(ic *interop.Context, v *vm.VM) error {
 	v.Estack().PushVal(ic.Chain.BlockHeight())
diff --git a/pkg/core/interops.go b/pkg/core/interops.go
index 889742b3a..c73f48105 100644
--- a/pkg/core/interops.go
+++ b/pkg/core/interops.go
@@ -64,7 +64,6 @@ func getInteropFromSlice(ic *interop.Context, slice []interop.Function) func(uin
 var systemInterops = []interop.Function{
 	{Name: "System.Blockchain.GetBlock", Func: bcGetBlock, Price: 250},
 	{Name: "System.Blockchain.GetContract", Func: bcGetContract, Price: 100},
-	{Name: "System.Blockchain.GetHeader", Func: bcGetHeader, Price: 100},
 	{Name: "System.Blockchain.GetHeight", Func: bcGetHeight, Price: 1},
 	{Name: "System.Blockchain.GetTransaction", Func: bcGetTransaction, Price: 100},
 	{Name: "System.Blockchain.GetTransactionFromBlock", Func: bcGetTransactionFromBlock, Price: 100},
@@ -73,14 +72,19 @@ var systemInterops = []interop.Function{
 	{Name: "System.Contract.CallEx", Func: contractCallEx, Price: 1},
 	{Name: "System.Contract.Destroy", Func: contractDestroy, Price: 1},
 	{Name: "System.Contract.GetStorageContext", Func: contractGetStorageContext, Price: 1},
+	{Name: "System.Enumerator.Concat", Func: enumerator.Concat, Price: 1},
+	{Name: "System.Enumerator.Create", Func: enumerator.Create, Price: 1},
+	{Name: "System.Enumerator.Next", Func: enumerator.Next, Price: 1},
+	{Name: "System.Enumerator.Value", Func: enumerator.Value, Price: 1},
 	{Name: "System.ExecutionEngine.GetCallingScriptHash", Func: engineGetCallingScriptHash, Price: 1},
 	{Name: "System.ExecutionEngine.GetEntryScriptHash", Func: engineGetEntryScriptHash, Price: 1},
 	{Name: "System.ExecutionEngine.GetExecutingScriptHash", Func: engineGetExecutingScriptHash, Price: 1},
 	{Name: "System.ExecutionEngine.GetScriptContainer", Func: engineGetScriptContainer, Price: 1},
-	{Name: "System.Header.GetHash", Func: headerGetHash, Price: 1},
-	{Name: "System.Header.GetIndex", Func: headerGetIndex, Price: 1},
-	{Name: "System.Header.GetPrevHash", Func: headerGetPrevHash, Price: 1},
-	{Name: "System.Header.GetTimestamp", Func: headerGetTimestamp, Price: 1},
+	{Name: "System.Iterator.Concat", Func: iterator.Concat, Price: 1},
+	{Name: "System.Iterator.Create", Func: iterator.Create, Price: 1},
+	{Name: "System.Iterator.Key", Func: iterator.Key, Price: 1},
+	{Name: "System.Iterator.Keys", Func: iterator.Keys, Price: 1},
+	{Name: "System.Iterator.Values", Func: iterator.Values, Price: 1},
 	{Name: "System.Runtime.CheckWitness", Func: runtime.CheckWitness, Price: 200},
 	{Name: "System.Runtime.Deserialize", Func: runtimeDeserialize, Price: 1},
 	{Name: "System.Runtime.GetTime", Func: runtimeGetTime, Price: 1},
@@ -90,22 +94,16 @@ var systemInterops = []interop.Function{
 	{Name: "System.Runtime.Platform", Func: runtimePlatform, Price: 1},
 	{Name: "System.Runtime.Serialize", Func: runtimeSerialize, Price: 1},
 	{Name: "System.Storage.Delete", Func: storageDelete, Price: 100},
+	{Name: "System.Storage.Find", Func: storageFind, Price: 1},
 	{Name: "System.Storage.Get", Func: storageGet, Price: 100},
 	{Name: "System.Storage.GetContext", Func: storageGetContext, Price: 1},
 	{Name: "System.Storage.GetReadOnlyContext", Func: storageGetReadOnlyContext, Price: 1},
 	{Name: "System.Storage.Put", Func: storagePut, Price: 0}, // These don't have static price in C# code.
 	{Name: "System.Storage.PutEx", Func: storagePutEx, Price: 0},
-	{Name: "System.StorageContext.AsReadOnly", Func: storageContextAsReadOnly, Price: 1},
+	{Name: "System.Storage.AsReadOnly", Func: storageContextAsReadOnly, Price: 1},
 }
 
 var neoInterops = []interop.Function{
-	{Name: "Neo.Account.GetBalance", Func: accountGetBalance, Price: 1},
-	{Name: "Neo.Account.GetScriptHash", Func: accountGetScriptHash, Price: 1},
-	{Name: "Neo.Account.IsStandard", Func: accountIsStandard, Price: 100},
-	{Name: "Neo.Blockchain.GetAccount", Func: bcGetAccount, Price: 100},
-	{Name: "Neo.Blockchain.GetContract", Func: bcGetContract, Price: 100},
-	{Name: "Neo.Blockchain.GetHeader", Func: bcGetHeader, Price: 100},
-	{Name: "Neo.Blockchain.GetHeight", Func: bcGetHeight, Price: 1},
 	{Name: "Neo.Contract.Create", Func: contractCreate, Price: 0},
 	{Name: "Neo.Contract.Destroy", Func: contractDestroy, Price: 1},
 	{Name: "Neo.Contract.GetScript", Func: contractGetScript, Price: 1},
@@ -115,42 +113,7 @@ var neoInterops = []interop.Function{
 	{Name: "Neo.Crypto.ECDsaVerify", Func: crypto.ECDSAVerify, Price: 1},
 	{Name: "Neo.Crypto.ECDsaCheckMultiSig", Func: crypto.ECDSACheckMultisig, Price: 1},
 	{Name: "Neo.Crypto.SHA256", Func: crypto.Sha256, Price: 1},
-	{Name: "Neo.Enumerator.Concat", Func: enumerator.Concat, Price: 1},
-	{Name: "Neo.Enumerator.Create", Func: enumerator.Create, Price: 1},
-	{Name: "Neo.Enumerator.Next", Func: enumerator.Next, Price: 1},
-	{Name: "Neo.Enumerator.Value", Func: enumerator.Value, Price: 1},
-	{Name: "Neo.Header.GetHash", Func: headerGetHash, Price: 1},
-	{Name: "Neo.Header.GetIndex", Func: headerGetIndex, Price: 1},
-	{Name: "Neo.Header.GetMerkleRoot", Func: headerGetMerkleRoot, Price: 1},
-	{Name: "Neo.Header.GetNextConsensus", Func: headerGetNextConsensus, Price: 1},
-	{Name: "Neo.Header.GetPrevHash", Func: headerGetPrevHash, Price: 1},
-	{Name: "Neo.Header.GetTimestamp", Func: headerGetTimestamp, Price: 1},
-	{Name: "Neo.Header.GetVersion", Func: headerGetVersion, Price: 1},
-	{Name: "Neo.Iterator.Concat", Func: iterator.Concat, Price: 1},
-	{Name: "Neo.Iterator.Create", Func: iterator.Create, Price: 1},
-	{Name: "Neo.Iterator.Key", Func: iterator.Key, Price: 1},
-	{Name: "Neo.Iterator.Keys", Func: iterator.Keys, Price: 1},
-	{Name: "Neo.Iterator.Values", Func: iterator.Values, Price: 1},
 	{Name: "Neo.Native.Deploy", Func: native.Deploy, Price: 1},
-	{Name: "Neo.Runtime.CheckWitness", Func: runtime.CheckWitness, Price: 200},
-	{Name: "Neo.Runtime.Deserialize", Func: runtimeDeserialize, Price: 1},
-	{Name: "Neo.Runtime.GetTime", Func: runtimeGetTime, Price: 1},
-	{Name: "Neo.Runtime.GetTrigger", Func: runtimeGetTrigger, Price: 1},
-	{Name: "Neo.Runtime.Log", Func: runtimeLog, Price: 1},
-	{Name: "Neo.Runtime.Notify", Func: runtimeNotify, Price: 1},
-	{Name: "Neo.Runtime.Serialize", Func: runtimeSerialize, Price: 1},
-	{Name: "Neo.Storage.Delete", Func: storageDelete, Price: 100},
-	{Name: "Neo.Storage.Find", Func: storageFind, Price: 1},
-	{Name: "Neo.Storage.Get", Func: storageGet, Price: 100},
-	{Name: "Neo.Storage.GetContext", Func: storageGetContext, Price: 1},
-	{Name: "Neo.Storage.GetReadOnlyContext", Func: storageGetReadOnlyContext, Price: 1},
-	{Name: "Neo.Storage.Put", Func: storagePut, Price: 0},
-	{Name: "Neo.StorageContext.AsReadOnly", Func: storageContextAsReadOnly, Price: 1},
-	{Name: "Neo.Witness.GetVerificationScript", Func: witnessGetVerificationScript, Price: 100},
-
-	// Aliases.
-	{Name: "Neo.Iterator.Next", Func: enumerator.Next, Price: 1},
-	{Name: "Neo.Iterator.Value", Func: enumerator.Value, Price: 1},
 }
 
 // initIDinInteropsSlice initializes IDs from names in one given
diff --git a/pkg/core/interops_test.go b/pkg/core/interops_test.go
index 40d4db5ae..b346926e2 100644
--- a/pkg/core/interops_test.go
+++ b/pkg/core/interops_test.go
@@ -32,25 +32,15 @@ func TestUnexpectedNonInterops(t *testing.T) {
 
 	// All of these functions expect an interop item on the stack.
 	funcs := []func(*interop.Context, *vm.VM) error{
-		accountGetBalance,
-		accountGetScriptHash,
 		contractGetScript,
 		contractGetStorageContext,
 		contractIsPayable,
-		headerGetHash,
-		headerGetIndex,
-		headerGetMerkleRoot,
-		headerGetNextConsensus,
-		headerGetPrevHash,
-		headerGetTimestamp,
-		headerGetVersion,
 		storageContextAsReadOnly,
 		storageDelete,
 		storageFind,
 		storageGet,
 		storagePut,
 		storagePutEx,
-		witnessGetVerificationScript,
 	}
 	for _, f := range funcs {
 		for k, v := range vals {
diff --git a/pkg/interop/account/account.go b/pkg/interop/account/account.go
deleted file mode 100644
index f0595eec0..000000000
--- a/pkg/interop/account/account.go
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
-Package account provides getter functions for Account interop structure.
-To use these functions you need to get an Account first via blockchain.GetAccount
-call.
-*/
-package account
-
-// Account represents NEO account type that is used in interop functions, it's
-// an opaque data structure that you can get data from only using functions from
-// this package. It's similar in function to the Account class in the Neo .net
-// framework.
-type Account struct{}
-
-// GetScriptHash returns the script hash of the given Account (20 bytes in BE
-// representation). It uses `Neo.Account.GetBalance` syscall internally.
-func GetScriptHash(a Account) []byte {
-	return nil
-}
-
-// GetVotes returns current votes of the given account represented as a slice of
-// public keys. Keys are serialized into byte slices in their compressed form (33
-// bytes long each). This function uses `Neo.Account.GetVotes` syscall
-// internally.
-func GetVotes(a Account) [][]byte {
-	return nil
-}
-
-// GetBalance returns current balance of the given asset (by its ID, 256 bit
-// hash in BE form) for the given account. Only native UTXO assets can be
-// queiried via this function, for NEP-5 ones use respective contract calls.
-// The value returned is represented as an integer with original value multiplied
-// by 10⁸ so you can work with fractional parts of the balance too. This function
-// uses `Neo.Account.GetBalance` syscall internally.
-func GetBalance(a Account, assetID []byte) int {
-	return 0
-}
-
-// IsStandard checks whether given account uses standard (CHECKSIG or
-// CHECKMULTISIG) contract. It only works for deployed contracts and uses
-// `Neo.Account.IsStandard` syscall internally.
-func IsStandard(a Account) bool {
-	return false
-}
diff --git a/pkg/interop/blockchain/blockchain.go b/pkg/interop/blockchain/blockchain.go
index 5afb272a5..417cd9d76 100644
--- a/pkg/interop/blockchain/blockchain.go
+++ b/pkg/interop/blockchain/blockchain.go
@@ -4,9 +4,7 @@ Package blockchain provides functions to access various blockchain data.
 package blockchain
 
 import (
-	"github.com/nspcc-dev/neo-go/pkg/interop/account"
 	"github.com/nspcc-dev/neo-go/pkg/interop/contract"
-	"github.com/nspcc-dev/neo-go/pkg/interop/header"
 )
 
 // Transaction represents a NEO transaction. It's similar to Transaction class
@@ -63,19 +61,11 @@ type Block struct {
 // Note that when transaction is being run as a part of new block this block is
 // considered as not yet accepted (persisted) and thus you'll get an index of
 // the previous (already accepted) block. This function uses
-// `Neo.Blockchain.GetHeight` syscall.
+// `System.Blockchain.GetHeight` syscall.
 func GetHeight() int {
 	return 0
 }
 
-// GetHeader returns header found by the given hash (256 bit hash in BE format
-// represented as a slice of 32 bytes) or index (integer). Refer to the `header`
-// package for possible uses of returned structure. This function uses
-// `Neo.Blockchain.GetHeader` syscall.
-func GetHeader(heightOrHash interface{}) header.Header {
-	return header.Header{}
-}
-
 // GetBlock returns block found by the given hash or index (with the same
 // encoding as for GetHeader). This function uses `System.Blockchain.GetBlock`
 // syscall.
@@ -108,22 +98,7 @@ func GetTransactionHeight(hash []byte) int {
 // GetContract returns contract found by the given script hash (160 bit in BE
 // format represented as a slice of 20 bytes). Refer to the `contract` package
 // for details on how to use the returned structure. This function uses
-// `Neo.Blockchain.GetContract` syscall.
+// `System.Blockchain.GetContract` syscall.
 func GetContract(scriptHash []byte) contract.Contract {
 	return contract.Contract{}
 }
-
-// GetAccount returns account found by the given script hash (160 bit in BE
-// format represented as a slice of 20 bytes). Refer to the `account` package
-// for details on how to use the returned structure. This function uses
-// `Neo.Blockchain.GetAccount` syscall.
-func GetAccount(scriptHash []byte) account.Account {
-	return account.Account{}
-}
-
-// GetValidators returns a slice of current validators public keys represented
-// as a compressed serialized byte slice (33 bytes long). This function uses
-// `Neo.Blockchain.GetValidators` syscall.
-func GetValidators() [][]byte {
-	return nil
-}
diff --git a/pkg/interop/enumerator/enumerator.go b/pkg/interop/enumerator/enumerator.go
index a47bff76f..ca52f4dcc 100644
--- a/pkg/interop/enumerator/enumerator.go
+++ b/pkg/interop/enumerator/enumerator.go
@@ -11,7 +11,7 @@ type Enumerator struct{}
 
 // Create creates a new enumerator from the given items (slice or structure).
 // New enumerator points at index -1 of its items, so the user of it has to
-// advance it first with Next. This function uses `Neo.Enumerator.Create`
+// advance it first with Next. This function uses `System.Enumerator.Create`
 // syscall.
 func Create(items []interface{}) Enumerator {
 	return Enumerator{}
@@ -20,13 +20,13 @@ func Create(items []interface{}) Enumerator {
 // Next moves position of the given enumerator by one and returns a bool that
 // tells whether there is a new value present in this new position. If it is,
 // you can use Value to get it, if not then there are no more values in this
-// enumerator. This function uses `Neo.Enumerator.Next` syscall.
+// enumerator. This function uses `System.Enumerator.Next` syscall.
 func Next(e Enumerator) bool {
 	return true
 }
 
 // Value returns current enumerator's item value, it's only valid to call it
-// after Next returning true. This function uses `Neo.Enumerator.Value` syscall.
+// after Next returning true. This function uses `System.Enumerator.Value` syscall.
 func Value(e Enumerator) interface{} {
 	return nil
 }
@@ -35,7 +35,7 @@ func Value(e Enumerator) interface{} {
 // a first and then continue with b. Enumerator positions are not reset for a
 // and b, so if any of them was already advanced by Next the resulting
 // Enumerator will point at this new position and never go back to previous
-// values. This function uses `Neo.Enumerator.Concat` syscall.
+// values. This function uses `System.Enumerator.Concat` syscall.
 func Concat(a, b Enumerator) Enumerator {
 	return Enumerator{}
 }
diff --git a/pkg/interop/header/header.go b/pkg/interop/header/header.go
deleted file mode 100644
index 37abe9676..000000000
--- a/pkg/interop/header/header.go
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
-Package header contains functions working with block headers.
-*/
-package header
-
-// Header represents Neo block header type, it's an opaque data structure that
-// can be used by functions from this package. You can create it with
-// blockchain.GetHeader. In its function it's similar to the Header class
-// of the Neo .net framework.
-type Header struct{}
-
-// GetIndex returns the index (height) of the given header. It uses
-// `Neo.Header.GetIndex` syscall.
-func GetIndex(h Header) int {
-	return 0
-}
-
-// GetHash returns the hash (256-bit BE value packed into 32 byte slice) of the
-// given header (which also is a hash of the block). It uses `Neo.Header.GetHash`
-// syscall.
-func GetHash(h Header) []byte {
-	return nil
-}
-
-// GetPrevHash returns the hash (256-bit BE value packed into 32 byte slice) of
-// the previous block stored in the given header. It uses `Neo.Header.GetPrevHash`
-// syscall.
-func GetPrevHash(h Header) []byte {
-	return nil
-}
-
-// GetTimestamp returns the timestamp of the given header. It uses
-// `Neo.Header.GetTimestamp` syscall.
-func GetTimestamp(h Header) int {
-	return 0
-}
-
-// GetVersion returns the version of the given header. It uses
-// `Neo.Header.GetVersion` syscall.
-func GetVersion(h Header) int {
-	return 0
-}
-
-// GetMerkleRoot returns the Merkle root (256-bit BE value packed into 32 byte
-// slice) of the given header. It uses `Neo.Header.GetMerkleRoot` syscall.
-func GetMerkleRoot(h Header) []byte {
-	return nil
-}
-
-// GetConsensusData returns the consensus data (nonce) of the given header.
-// It uses `Neo.Header.GetConsensusData` syscall.
-func GetConsensusData(h Header) int {
-	return 0
-}
-
-// GetNextConsensus returns the next consensus field (verification script hash,
-// 160-bit BE value packed into 20 byte slice) of the given header. It uses
-// `Neo.Header.GetNextConsensus` syscall.
-func GetNextConsensus(h Header) []byte {
-	return nil
-}
diff --git a/pkg/interop/iterator/iterator.go b/pkg/interop/iterator/iterator.go
index ec407ee0a..9e295f11e 100644
--- a/pkg/interop/iterator/iterator.go
+++ b/pkg/interop/iterator/iterator.go
@@ -13,7 +13,7 @@ type Iterator struct{}
 
 // Create creates an iterator from the given items (array, struct or map). A new
 // iterator is set to point at element -1, so to access its first element you
-// need to call Next first. This function uses `Neo.Iterator.Create` syscall.
+// need to call Next first. This function uses `System.Iterator.Create` syscall.
 func Create(items []interface{}) Iterator {
 	return Iterator{}
 }
@@ -24,13 +24,13 @@ func Create(items []interface{}) Iterator {
 // Iterator will point at this new position and never go back to previous
 // key-value pairs. Concatenated iterators also remain completely independent
 // in results they return, so if both contain the same key you'll receive this
-// key twice when iterating. This function uses `Neo.Iterator.Concat` syscall.
+// key twice when iterating. This function uses `System.Iterator.Concat` syscall.
 func Concat(a, b Iterator) Iterator {
 	return Iterator{}
 }
 
 // Key returns iterator's key at current position. It's only valid to call after
-// successful Next call. This function uses `Neo.Iterator.Key` syscall.
+// successful Next call. This function uses `System.Iterator.Key` syscall.
 func Key(it Iterator) interface{} {
 	return nil
 }
@@ -38,20 +38,20 @@ func Key(it Iterator) interface{} {
 // Keys returns Enumerator ranging over keys or the given Iterator. Note that
 // this Enumerator is actually directly tied to the underlying Iterator, so that
 // advancing it with Next will actually advance the Iterator too. This function
-// uses `Neo.Iterator.Keys` syscall.
+// uses `System.Iterator.Keys` syscall.
 func Keys(it Iterator) enumerator.Enumerator {
 	return enumerator.Enumerator{}
 }
 
 // Next advances the iterator returning true if it is was successful (and you
 // can use Key or Value) and false otherwise (and there are no more elements in
-// this Iterator). This function uses `Neo.Iterator.Next` syscall.
+// this Iterator). This function uses `System.Enumerator.Next` syscall.
 func Next(it Iterator) bool {
 	return true
 }
 
 // Value returns iterator's current value. It's only valid to call after
-// successful Next call. This function uses `Neo.Iterator.Value` syscall.
+// successful Next call. This function uses `System.Enumerator.Value` syscall.
 func Value(it Iterator) interface{} {
 	return nil
 }
@@ -59,7 +59,7 @@ func Value(it Iterator) interface{} {
 // Values returns Enumerator ranging over values or the given Iterator. Note that
 // this Enumerator is actually directly tied to the underlying Iterator, so that
 // advancing it with Next will actually advance the Iterator too. This function
-// uses `Neo.Iterator.Values` syscall.
+// uses `System.Iterator.Values` syscall.
 func Values(it Iterator) enumerator.Enumerator {
 	return enumerator.Enumerator{}
 }
diff --git a/pkg/interop/runtime/runtime.go b/pkg/interop/runtime/runtime.go
index 9b7e837d3..ec7c52a8b 100644
--- a/pkg/interop/runtime/runtime.go
+++ b/pkg/interop/runtime/runtime.go
@@ -6,14 +6,14 @@ package runtime
 
 // CheckWitness verifies if the given script hash (160-bit BE value in a 20 byte
 // slice) or key (compressed serialized 33-byte form) is one of the signers of
-// this invocation. It uses `Neo.Runtime.CheckWitness` syscall.
+// this invocation. It uses `System.Runtime.CheckWitness` syscall.
 func CheckWitness(hashOrKey []byte) bool {
 	return true
 }
 
 // Log instructs VM to log the given message. It's mostly used for debugging
 // purposes as these messages are not saved anywhere normally and usually are
-// only visible in the VM logs. This function uses `Neo.Runtime.Log` syscall.
+// only visible in the VM logs. This function uses `System.Runtime.Log` syscall.
 func Log(message string) {}
 
 // Notify sends a notification (collecting all arguments in an array) to the
@@ -21,14 +21,14 @@ func Log(message string) {}
 // notification is saved in application log. It's intended to be used as a
 // part of contract's API to external systems, these events can be monitored
 // from outside and act upon accordingly. This function uses
-// `Neo.Runtime.Notify` syscall.
+// `System.Runtime.Notify` syscall.
 func Notify(arg ...interface{}) {}
 
 // GetTime returns the timestamp of the most recent block. Note that when running
 // script in test mode this would be the last accepted (persisted) block in the
 // chain, but when running as a part of the new block the time returned is the
 // time of this (currently being processed) block. This function uses
-// `Neo.Runtime.GetTime` syscall.
+// `System.Runtime.GetTime` syscall.
 func GetTime() int {
 	return 0
 }
@@ -38,7 +38,7 @@ func GetTime() int {
 // as a part of verification process from running it as a regular application.
 // Some interop functions (especially ones that change the state in any way) are
 // not available when running with verification trigger. This function uses
-// `Neo.Runtime.GetTrigger` syscall.
+// `System.Runtime.GetTrigger` syscall.
 func GetTrigger() byte {
 	return 0x00
 }
@@ -58,13 +58,13 @@ func Verification() byte {
 // Serialize serializes any given item into a byte slice. It works for all
 // regular VM types (not ones from interop package) and allows to save them in
 // storage or pass into Notify and then Deserialize them on the next run or in
-// the external event receiver. It uses `Neo.Runtime.Serialize` syscall.
+// the external event receiver. It uses `System.Runtime.Serialize` syscall.
 func Serialize(item interface{}) []byte {
 	return nil
 }
 
 // Deserialize unpacks previously serialized value from a byte slice, it's the
-// opposite of Serialize. It uses `Neo.Runtime.Deserialize` syscall.
+// opposite of Serialize. It uses `System.Runtime.Deserialize` syscall.
 func Deserialize(b []byte) interface{} {
 	return nil
 }
diff --git a/pkg/interop/storage/storage.go b/pkg/interop/storage/storage.go
index a047eebb1..748157ef6 100644
--- a/pkg/interop/storage/storage.go
+++ b/pkg/interop/storage/storage.go
@@ -17,38 +17,38 @@ type Context struct{}
 // ConvertContextToReadOnly returns new context from the given one, but with
 // writing capability turned off, so that you could only invoke Get and Find
 // using this new Context. If Context is already read-only this function is a
-// no-op. It uses `Neo.StorageContext.AsReadOnly` syscall.
+// no-op. It uses `System.Storage.AsReadOnly` syscall.
 func ConvertContextToReadOnly(ctx Context) Context { return Context{} }
 
 // GetContext returns current contract's (that invokes this function) storage
-// context. It uses `Neo.Storage.GetContext` syscall.
+// context. It uses `System.Storage.GetContext` syscall.
 func GetContext() Context { return Context{} }
 
 // GetReadOnlyContext returns current contract's (that invokes this function)
 // storage context in read-only mode, you can use this context for Get and Find
 // functions, but using it for Put and Delete will fail. It uses
-// `Neo.Storage.GetReadOnlyContext` syscall.
+// `System.Storage.GetReadOnlyContext` syscall.
 func GetReadOnlyContext() Context { return Context{} }
 
 // Put saves given value with given key in the storage using given Context.
 // Even though it accepts interface{} for both, you can only pass simple types
 // there like string, []byte, int or bool (not structures or slices of more
 // complex types). To put more complex types there serialize them first using
-// runtime.Serialize. This function uses `Neo.Storage.Put` syscall.
+// runtime.Serialize. This function uses `System.Storage.Put` syscall.
 func Put(ctx Context, key interface{}, value interface{}) {}
 
 // Get retrieves value stored for the given key using given Context. See Put
 // documentation on possible key and value types. This function uses
-// `Neo.Storage.Get` syscall.
+// `System.Storage.Get` syscall.
 func Get(ctx Context, key interface{}) interface{} { return 0 }
 
 // Delete removes key-value pair from storage by the given key using given
 // Context. See Put documentation on possible key types. This function uses
-// `Neo.Storage.Delete` syscall.
+// `System.Storage.Delete` syscall.
 func Delete(ctx Context, key interface{}) {}
 
 // Find returns an iterator.Iterator over key-value pairs in the given Context
 // that match the given key (contain it as a prefix). See Put documentation on
 // possible key types and iterator package documentation on how to use the
-// returned value. This function uses `Neo.Storage.Find` syscall.
+// returned value. This function uses `System.Storage.Find` syscall.
 func Find(ctx Context, key interface{}) iterator.Iterator { return iterator.Iterator{} }
diff --git a/pkg/interop/witness/witness.go b/pkg/interop/witness/witness.go
deleted file mode 100644
index 5bf742f83..000000000
--- a/pkg/interop/witness/witness.go
+++ /dev/null
@@ -1,14 +0,0 @@
-/*
-Package witness provides functions dealing with transaction's witnesses.
-*/
-package witness
-
-// Witness is an opaque data structure that can only be created by
-// transaction.GetWitnesses and representing transaction's witness.
-type Witness struct{}
-
-// GetVerificationScript returns verification script stored in the given
-// witness. It uses `Neo.Witness.GetVerificationScript` syscall.
-func GetVerificationScript(w Witness) []byte {
-	return nil
-}
diff --git a/pkg/rpc/server/server_test.go b/pkg/rpc/server/server_test.go
index 69af43432..c10180304 100644
--- a/pkg/rpc/server/server_test.go
+++ b/pkg/rpc/server/server_test.go
@@ -49,18 +49,18 @@ type rpcTestCase struct {
 	check  func(t *testing.T, e *executor, result interface{})
 }
 
-const testContractHash = "1b4357bff5a01bdf2a6581247cf9ed1e24629176"
+const testContractHash = "279c86355b30d452386c1717e2ffa01c9dac31f3"
 
 var rpcTestCases = map[string][]rpcTestCase{
 	"getapplicationlog": {
 		{
 			name:   "positive",
-			params: `["5878052c7e9843786d64a9aeab16e74fabffd5abad9a0404aaf4f4bf2b6213e9"]`,
+			params: `["328190e78f1b5b8dcf86e71ec1894d6144f4e4cdb25abc20ea02b618851941dd"]`,
 			result: func(e *executor) interface{} { return &result.ApplicationLog{} },
 			check: func(t *testing.T, e *executor, acc interface{}) {
 				res, ok := acc.(*result.ApplicationLog)
 				require.True(t, ok)
-				expectedTxHash, err := util.Uint256DecodeStringLE("5878052c7e9843786d64a9aeab16e74fabffd5abad9a0404aaf4f4bf2b6213e9")
+				expectedTxHash, err := util.Uint256DecodeStringLE("328190e78f1b5b8dcf86e71ec1894d6144f4e4cdb25abc20ea02b618851941dd")
 				require.NoError(t, err)
 				assert.Equal(t, expectedTxHash, res.TxHash)
 				assert.Equal(t, 1, len(res.Executions))
@@ -484,7 +484,7 @@ var rpcTestCases = map[string][]rpcTestCase{
 	"gettransactionheight": {
 		{
 			name:   "positive",
-			params: `["5878052c7e9843786d64a9aeab16e74fabffd5abad9a0404aaf4f4bf2b6213e9"]`,
+			params: `["328190e78f1b5b8dcf86e71ec1894d6144f4e4cdb25abc20ea02b618851941dd"]`,
 			result: func(e *executor) interface{} {
 				h := 0
 				return &h
diff --git a/pkg/rpc/server/testdata/test_contract.avm b/pkg/rpc/server/testdata/test_contract.avm
index 36266c55e..459d4e221 100755
Binary files a/pkg/rpc/server/testdata/test_contract.avm and b/pkg/rpc/server/testdata/test_contract.avm differ
diff --git a/pkg/rpc/server/testdata/testblocks.acc b/pkg/rpc/server/testdata/testblocks.acc
index b24ef7a0e..bb02750f5 100644
Binary files a/pkg/rpc/server/testdata/testblocks.acc and b/pkg/rpc/server/testdata/testblocks.acc differ
diff --git a/pkg/vm/emit/emit_test.go b/pkg/vm/emit/emit_test.go
index bb0024fb9..67fec612d 100644
--- a/pkg/vm/emit/emit_test.go
+++ b/pkg/vm/emit/emit_test.go
@@ -189,9 +189,9 @@ func TestEmitString(t *testing.T) {
 
 func TestEmitSyscall(t *testing.T) {
 	syscalls := []string{
-		"Neo.Runtime.Log",
-		"Neo.Runtime.Notify",
-		"Neo.Runtime.Whatever",
+		"System.Runtime.Log",
+		"System.Runtime.Notify",
+		"System.Runtime.Whatever",
 	}
 
 	buf := io.NewBufBinWriter()
diff --git a/pkg/vm/interop.go b/pkg/vm/interop.go
index 8003d6a76..4024a09f4 100644
--- a/pkg/vm/interop.go
+++ b/pkg/vm/interop.go
@@ -29,35 +29,31 @@ type interopIDFuncPrice struct {
 type InteropGetterFunc func(uint32) *InteropFuncPrice
 
 var defaultVMInterops = []interopIDFuncPrice{
-	{emit.InteropNameToID([]byte("Neo.Runtime.Log")),
+	{emit.InteropNameToID([]byte("System.Runtime.Log")),
 		InteropFuncPrice{runtimeLog, 1}},
-	{emit.InteropNameToID([]byte("Neo.Runtime.Notify")),
+	{emit.InteropNameToID([]byte("System.Runtime.Notify")),
 		InteropFuncPrice{runtimeNotify, 1}},
-	{emit.InteropNameToID([]byte("Neo.Runtime.Serialize")),
-		InteropFuncPrice{RuntimeSerialize, 1}},
 	{emit.InteropNameToID([]byte("System.Runtime.Serialize")),
 		InteropFuncPrice{RuntimeSerialize, 1}},
-	{emit.InteropNameToID([]byte("Neo.Runtime.Deserialize")),
-		InteropFuncPrice{RuntimeDeserialize, 1}},
 	{emit.InteropNameToID([]byte("System.Runtime.Deserialize")),
 		InteropFuncPrice{RuntimeDeserialize, 1}},
-	{emit.InteropNameToID([]byte("Neo.Enumerator.Create")),
+	{emit.InteropNameToID([]byte("System.Enumerator.Create")),
 		InteropFuncPrice{EnumeratorCreate, 1}},
-	{emit.InteropNameToID([]byte("Neo.Enumerator.Next")),
+	{emit.InteropNameToID([]byte("System.Enumerator.Next")),
 		InteropFuncPrice{EnumeratorNext, 1}},
-	{emit.InteropNameToID([]byte("Neo.Enumerator.Concat")),
+	{emit.InteropNameToID([]byte("System.Enumerator.Concat")),
 		InteropFuncPrice{EnumeratorConcat, 1}},
-	{emit.InteropNameToID([]byte("Neo.Enumerator.Value")),
+	{emit.InteropNameToID([]byte("System.Enumerator.Value")),
 		InteropFuncPrice{EnumeratorValue, 1}},
-	{emit.InteropNameToID([]byte("Neo.Iterator.Create")),
+	{emit.InteropNameToID([]byte("System.Iterator.Create")),
 		InteropFuncPrice{IteratorCreate, 1}},
-	{emit.InteropNameToID([]byte("Neo.Iterator.Concat")),
+	{emit.InteropNameToID([]byte("System.Iterator.Concat")),
 		InteropFuncPrice{IteratorConcat, 1}},
-	{emit.InteropNameToID([]byte("Neo.Iterator.Key")),
+	{emit.InteropNameToID([]byte("System.Iterator.Key")),
 		InteropFuncPrice{IteratorKey, 1}},
-	{emit.InteropNameToID([]byte("Neo.Iterator.Keys")),
+	{emit.InteropNameToID([]byte("System.Iterator.Keys")),
 		InteropFuncPrice{IteratorKeys, 1}},
-	{emit.InteropNameToID([]byte("Neo.Iterator.Values")),
+	{emit.InteropNameToID([]byte("System.Iterator.Values")),
 		InteropFuncPrice{IteratorValues, 1}},
 }
 
@@ -71,21 +67,21 @@ func getDefaultVMInterop(id uint32) *InteropFuncPrice {
 	return nil
 }
 
-// runtimeLog handles the syscall "Neo.Runtime.Log" for printing and logging stuff.
+// runtimeLog handles the syscall "System.Runtime.Log" for printing and logging stuff.
 func runtimeLog(vm *VM) error {
 	item := vm.Estack().Pop()
 	fmt.Printf("NEO-GO-VM (log) > %s\n", item.Value())
 	return nil
 }
 
-// runtimeNotify handles the syscall "Neo.Runtime.Notify" for printing and logging stuff.
+// runtimeNotify handles the syscall "System.Runtime.Notify" for printing and logging stuff.
 func runtimeNotify(vm *VM) error {
 	item := vm.Estack().Pop()
 	fmt.Printf("NEO-GO-VM (notify) > %s\n", item.Value())
 	return nil
 }
 
-// RuntimeSerialize handles syscalls System.Runtime.Serialize and Neo.Runtime.Serialize.
+// RuntimeSerialize handles syscalls System.Runtime.Serialize and System.Runtime.Serialize.
 func RuntimeSerialize(vm *VM) error {
 	item := vm.Estack().Pop()
 	data, err := stackitem.SerializeItem(item.value)
@@ -100,7 +96,7 @@ func RuntimeSerialize(vm *VM) error {
 	return nil
 }
 
-// RuntimeDeserialize handles syscalls System.Runtime.Deserialize and Neo.Runtime.Deserialize.
+// RuntimeDeserialize handles syscalls System.Runtime.Deserialize and System.Runtime.Deserialize.
 func RuntimeDeserialize(vm *VM) error {
 	data := vm.Estack().Pop().Bytes()
 
@@ -121,7 +117,7 @@ func init() {
 	})
 }
 
-// EnumeratorCreate handles syscall Neo.Enumerator.Create.
+// EnumeratorCreate handles syscall System.Enumerator.Create.
 func EnumeratorCreate(v *VM) error {
 	data := v.Estack().Pop().Array()
 	v.Estack().Push(&Element{
@@ -134,7 +130,7 @@ func EnumeratorCreate(v *VM) error {
 	return nil
 }
 
-// EnumeratorNext handles syscall Neo.Enumerator.Next.
+// EnumeratorNext handles syscall System.Enumerator.Next.
 func EnumeratorNext(v *VM) error {
 	iop := v.Estack().Pop().Interop()
 	arr := iop.Value().(enumerator)
@@ -143,7 +139,7 @@ func EnumeratorNext(v *VM) error {
 	return nil
 }
 
-// EnumeratorValue handles syscall Neo.Enumerator.Value.
+// EnumeratorValue handles syscall System.Enumerator.Value.
 func EnumeratorValue(v *VM) error {
 	iop := v.Estack().Pop().Interop()
 	arr := iop.Value().(enumerator)
@@ -152,7 +148,7 @@ func EnumeratorValue(v *VM) error {
 	return nil
 }
 
-// EnumeratorConcat handles syscall Neo.Enumerator.Concat.
+// EnumeratorConcat handles syscall System.Enumerator.Concat.
 func EnumeratorConcat(v *VM) error {
 	iop1 := v.Estack().Pop().Interop()
 	arr1 := iop1.Value().(enumerator)
@@ -169,7 +165,7 @@ func EnumeratorConcat(v *VM) error {
 	return nil
 }
 
-// IteratorCreate handles syscall Neo.Iterator.Create.
+// IteratorCreate handles syscall System.Iterator.Create.
 func IteratorCreate(v *VM) error {
 	data := v.Estack().Pop()
 	var item stackitem.Item
@@ -197,7 +193,7 @@ func NewMapIterator(m *stackitem.Map) *stackitem.Interop {
 	})
 }
 
-// IteratorConcat handles syscall Neo.Iterator.Concat.
+// IteratorConcat handles syscall System.Iterator.Concat.
 func IteratorConcat(v *VM) error {
 	iop1 := v.Estack().Pop().Interop()
 	iter1 := iop1.Value().(iterator)
@@ -214,7 +210,7 @@ func IteratorConcat(v *VM) error {
 	return nil
 }
 
-// IteratorKey handles syscall Neo.Iterator.Key.
+// IteratorKey handles syscall System.Iterator.Key.
 func IteratorKey(v *VM) error {
 	iop := v.estack.Pop().Interop()
 	iter := iop.Value().(iterator)
@@ -223,7 +219,7 @@ func IteratorKey(v *VM) error {
 	return nil
 }
 
-// IteratorKeys handles syscall Neo.Iterator.Keys.
+// IteratorKeys handles syscall System.Iterator.Keys.
 func IteratorKeys(v *VM) error {
 	iop := v.estack.Pop().Interop()
 	iter := iop.Value().(iterator)
@@ -234,7 +230,7 @@ func IteratorKeys(v *VM) error {
 	return nil
 }
 
-// IteratorValues handles syscall Neo.Iterator.Values.
+// IteratorValues handles syscall System.Iterator.Values.
 func IteratorValues(v *VM) error {
 	iop := v.estack.Pop().Interop()
 	iter := iop.Value().(iterator)
diff --git a/pkg/vm/vm_test.go b/pkg/vm/vm_test.go
index bf7d75702..746df0494 100644
--- a/pkg/vm/vm_test.go
+++ b/pkg/vm/vm_test.go
@@ -488,16 +488,16 @@ func getEnumeratorProg(n int, isIter bool) (prog []byte) {
 	prog = []byte{byte(opcode.INITSSLOT), 1, byte(opcode.STSFLD0)}
 	for i := 0; i < n; i++ {
 		prog = append(prog, byte(opcode.LDSFLD0))
-		prog = append(prog, getSyscallProg("Neo.Enumerator.Next")...)
+		prog = append(prog, getSyscallProg("System.Enumerator.Next")...)
 		prog = append(prog, byte(opcode.LDSFLD0))
-		prog = append(prog, getSyscallProg("Neo.Enumerator.Value")...)
+		prog = append(prog, getSyscallProg("System.Enumerator.Value")...)
 		if isIter {
 			prog = append(prog, byte(opcode.LDSFLD0))
-			prog = append(prog, getSyscallProg("Neo.Iterator.Key")...)
+			prog = append(prog, getSyscallProg("System.Iterator.Key")...)
 		}
 	}
 	prog = append(prog, byte(opcode.LDSFLD0))
-	prog = append(prog, getSyscallProg("Neo.Enumerator.Next")...)
+	prog = append(prog, getSyscallProg("System.Enumerator.Next")...)
 
 	return
 }
@@ -512,7 +512,7 @@ func checkEnumeratorStack(t *testing.T, vm *VM, arr []stackitem.Item) {
 
 func testIterableCreate(t *testing.T, typ string) {
 	isIter := typ == "Iterator"
-	prog := getSyscallProg("Neo." + typ + ".Create")
+	prog := getSyscallProg("System." + typ + ".Create")
 	prog = append(prog, getEnumeratorProg(2, isIter)...)
 
 	vm := load(prog)
@@ -546,10 +546,10 @@ func TestIteratorCreate(t *testing.T) {
 
 func testIterableConcat(t *testing.T, typ string) {
 	isIter := typ == "Iterator"
-	prog := getSyscallProg("Neo." + typ + ".Create")
+	prog := getSyscallProg("System." + typ + ".Create")
 	prog = append(prog, byte(opcode.SWAP))
-	prog = append(prog, getSyscallProg("Neo."+typ+".Create")...)
-	prog = append(prog, getSyscallProg("Neo."+typ+".Concat")...)
+	prog = append(prog, getSyscallProg("System."+typ+".Create")...)
+	prog = append(prog, getSyscallProg("System."+typ+".Concat")...)
 	prog = append(prog, getEnumeratorProg(3, isIter)...)
 	vm := load(prog)
 
@@ -589,8 +589,8 @@ func TestIteratorConcat(t *testing.T) {
 }
 
 func TestIteratorKeys(t *testing.T) {
-	prog := getSyscallProg("Neo.Iterator.Create")
-	prog = append(prog, getSyscallProg("Neo.Iterator.Keys")...)
+	prog := getSyscallProg("System.Iterator.Create")
+	prog = append(prog, getSyscallProg("System.Iterator.Keys")...)
 	prog = append(prog, getEnumeratorProg(2, false)...)
 
 	v := load(prog)
@@ -609,8 +609,8 @@ func TestIteratorKeys(t *testing.T) {
 }
 
 func TestIteratorValues(t *testing.T) {
-	prog := getSyscallProg("Neo.Iterator.Create")
-	prog = append(prog, getSyscallProg("Neo.Iterator.Values")...)
+	prog := getSyscallProg("System.Iterator.Create")
+	prog = append(prog, getSyscallProg("System.Iterator.Values")...)
 	prog = append(prog, getEnumeratorProg(2, false)...)
 
 	v := load(prog)
@@ -643,8 +643,8 @@ func getSyscallProg(name string) (prog []byte) {
 }
 
 func getSerializeProg() (prog []byte) {
-	prog = append(prog, getSyscallProg("Neo.Runtime.Serialize")...)
-	prog = append(prog, getSyscallProg("Neo.Runtime.Deserialize")...)
+	prog = append(prog, getSyscallProg("System.Runtime.Serialize")...)
+	prog = append(prog, getSyscallProg("System.Runtime.Deserialize")...)
 	prog = append(prog, byte(opcode.RET))
 
 	return
@@ -749,7 +749,7 @@ func TestSerializeStruct(t *testing.T) {
 }
 
 func TestDeserializeUnknown(t *testing.T) {
-	prog := append(getSyscallProg("Neo.Runtime.Deserialize"), byte(opcode.RET))
+	prog := append(getSyscallProg("System.Runtime.Deserialize"), byte(opcode.RET))
 
 	data, err := stackitem.SerializeItem(stackitem.NewBigInteger(big.NewInt(123)))
 	require.NoError(t, err)
@@ -785,7 +785,7 @@ func TestSerializeMapCompat(t *testing.T) {
 	emit.Bytes(buf.BinWriter, []byte("key"))
 	emit.Bytes(buf.BinWriter, []byte("value"))
 	emit.Opcode(buf.BinWriter, opcode.SETITEM)
-	emit.Syscall(buf.BinWriter, "Neo.Runtime.Serialize")
+	emit.Syscall(buf.BinWriter, "System.Runtime.Serialize")
 	require.NoError(t, buf.Err)
 
 	vm := load(buf.Bytes())