diff --git a/pkg/compiler/debug_test.go b/pkg/compiler/debug_test.go
index 5e1c0346d..08d5da8f9 100644
--- a/pkg/compiler/debug_test.go
+++ b/pkg/compiler/debug_test.go
@@ -1,6 +1,7 @@
 package compiler
 
 import (
+	"encoding/json"
 	"testing"
 
 	"github.com/nspcc-dev/neo-go/internal/testserdes"
@@ -265,7 +266,7 @@ func _deploy(data interface{}, isUpdate bool) {}
 			Trusts: manifest.WildUint160s{
 				Value: []util.Uint160{},
 			},
-			Extra: nil,
+			Extra: json.RawMessage("null"),
 		}
 		require.ElementsMatch(t, expected.ABI.Methods, actual.ABI.Methods)
 		require.Equal(t, expected.ABI.Events, actual.ABI.Events)
diff --git a/pkg/core/native/ledger.go b/pkg/core/native/ledger.go
index b521238ce..15817910d 100644
--- a/pkg/core/native/ledger.go
+++ b/pkg/core/native/ledger.go
@@ -53,12 +53,12 @@ func newLedger() *Ledger {
 	l.AddMethod(md, desc)
 
 	desc = newDescriptor("getTransaction", smartcontract.ArrayType,
-		manifest.NewParameter("hash", smartcontract.ByteArrayType))
+		manifest.NewParameter("hash", smartcontract.Hash256Type))
 	md = newMethodAndPrice(l.getTransaction, 1000000, callflag.ReadStates)
 	l.AddMethod(md, desc)
 
 	desc = newDescriptor("getTransactionHeight", smartcontract.IntegerType,
-		manifest.NewParameter("hash", smartcontract.ByteArrayType))
+		manifest.NewParameter("hash", smartcontract.Hash256Type))
 	md = newMethodAndPrice(l.getTransactionHeight, 1000000, callflag.ReadStates)
 	l.AddMethod(md, desc)
 
diff --git a/pkg/core/native/management.go b/pkg/core/native/management.go
index 8b7e534a1..a2787ac80 100644
--- a/pkg/core/native/management.go
+++ b/pkg/core/native/management.go
@@ -72,26 +72,26 @@ func newManagement() *Management {
 	m.AddMethod(md, desc)
 
 	desc = newDescriptor("deploy", smartcontract.ArrayType,
-		manifest.NewParameter("script", smartcontract.ByteArrayType),
+		manifest.NewParameter("nefFile", smartcontract.ByteArrayType),
 		manifest.NewParameter("manifest", smartcontract.ByteArrayType))
 	md = newMethodAndPrice(m.deploy, 0, callflag.WriteStates|callflag.AllowNotify)
 	m.AddMethod(md, desc)
 
 	desc = newDescriptor("deploy", smartcontract.ArrayType,
-		manifest.NewParameter("script", smartcontract.ByteArrayType),
+		manifest.NewParameter("nefFile", smartcontract.ByteArrayType),
 		manifest.NewParameter("manifest", smartcontract.ByteArrayType),
 		manifest.NewParameter("data", smartcontract.AnyType))
 	md = newMethodAndPrice(m.deployWithData, 0, callflag.WriteStates|callflag.AllowNotify)
 	m.AddMethod(md, desc)
 
 	desc = newDescriptor("update", smartcontract.VoidType,
-		manifest.NewParameter("script", smartcontract.ByteArrayType),
+		manifest.NewParameter("nefFile", smartcontract.ByteArrayType),
 		manifest.NewParameter("manifest", smartcontract.ByteArrayType))
 	md = newMethodAndPrice(m.update, 0, callflag.WriteStates|callflag.AllowNotify)
 	m.AddMethod(md, desc)
 
 	desc = newDescriptor("update", smartcontract.VoidType,
-		manifest.NewParameter("script", smartcontract.ByteArrayType),
+		manifest.NewParameter("nefFile", smartcontract.ByteArrayType),
 		manifest.NewParameter("manifest", smartcontract.ByteArrayType),
 		manifest.NewParameter("data", smartcontract.AnyType))
 	md = newMethodAndPrice(m.updateWithData, 0, callflag.WriteStates|callflag.AllowNotify)
diff --git a/pkg/core/native/native_neo.go b/pkg/core/native/native_neo.go
index 57f83d713..6c35b1b22 100644
--- a/pkg/core/native/native_neo.go
+++ b/pkg/core/native/native_neo.go
@@ -125,7 +125,7 @@ func newNEO() *NEO {
 
 	desc = newDescriptor("vote", smartcontract.BoolType,
 		manifest.NewParameter("account", smartcontract.Hash160Type),
-		manifest.NewParameter("pubkey", smartcontract.ByteArrayType))
+		manifest.NewParameter("voteTo", smartcontract.ByteArrayType))
 	md = newMethodAndPrice(n.vote, 5000000, callflag.WriteStates)
 	n.AddMethod(md, desc)
 
diff --git a/pkg/core/native/native_nep17.go b/pkg/core/native/native_nep17.go
index 7c2a0f1c7..359f65f25 100644
--- a/pkg/core/native/native_nep17.go
+++ b/pkg/core/native/native_nep17.go
@@ -258,13 +258,19 @@ func (c *nep17TokenNative) addTokens(ic *interop.Context, h util.Uint160, amount
 	if err := c.incBalance(ic, h, si, amount); err != nil {
 		panic(err)
 	}
-	if err := ic.DAO.PutStorageItem(c.ID, key, si); err != nil {
+	var err error
+	if si.Value == nil {
+		err = ic.DAO.DeleteStorageItem(c.ID, key)
+	} else {
+		err = ic.DAO.PutStorageItem(c.ID, key, si)
+	}
+	if err != nil {
 		panic(err)
 	}
 
 	supply := c.getTotalSupply(ic.DAO)
 	supply.Add(supply, amount)
-	err := c.saveTotalSupply(ic.DAO, supply)
+	err = c.saveTotalSupply(ic.DAO, supply)
 	if err != nil {
 		panic(err)
 	}
diff --git a/pkg/core/native/nonfungible.go b/pkg/core/native/nonfungible.go
index afbfd7292..0aa2239ba 100644
--- a/pkg/core/native/nonfungible.go
+++ b/pkg/core/native/nonfungible.go
@@ -95,11 +95,11 @@ func newNonFungible(name string, id int32, symbol string, decimals byte) *nonfun
 	md = newMethodAndPrice(n.Properties, 1000000, callflag.ReadStates)
 	n.AddMethod(md, desc)
 
-	desc = newDescriptor("tokens", smartcontract.InteropInterfaceType)
+	desc = newDescriptor("tokens", smartcontract.AnyType)
 	md = newMethodAndPrice(n.tokens, 1000000, callflag.ReadStates)
 	n.AddMethod(md, desc)
 
-	desc = newDescriptor("tokensOf", smartcontract.InteropInterfaceType,
+	desc = newDescriptor("tokensOf", smartcontract.AnyType,
 		manifest.NewParameter("owner", smartcontract.Hash160Type))
 	md = newMethodAndPrice(n.tokensOf, 1000000, callflag.ReadStates)
 	n.AddMethod(md, desc)
diff --git a/pkg/core/native_management_test.go b/pkg/core/native_management_test.go
index b0ba0082a..1445fd901 100644
--- a/pkg/core/native_management_test.go
+++ b/pkg/core/native_management_test.go
@@ -481,7 +481,7 @@ func TestContractUpdate(t *testing.T) {
 		})
 	})
 
-	cs1.Manifest.Extra = "update me"
+	cs1.Manifest.Extra = []byte(`"update me"`)
 	manif1, err = json.Marshal(cs1.Manifest)
 	require.NoError(t, err)
 	cs1.UpdateCounter++
@@ -504,7 +504,7 @@ func TestContractUpdate(t *testing.T) {
 	cs1.NEF.Checksum = cs1.NEF.CalculateChecksum()
 	nef1b, err = cs1.NEF.Bytes()
 	require.NoError(t, err)
-	cs1.Manifest.Extra = "update me once more"
+	cs1.Manifest.Extra = []byte(`"update me once more"`)
 	manif1, err = json.Marshal(cs1.Manifest)
 	require.NoError(t, err)
 	cs1.UpdateCounter++
diff --git a/pkg/smartcontract/manifest/manifest.go b/pkg/smartcontract/manifest/manifest.go
index c7bbd0fe7..31a3011a4 100644
--- a/pkg/smartcontract/manifest/manifest.go
+++ b/pkg/smartcontract/manifest/manifest.go
@@ -34,7 +34,7 @@ type Manifest struct {
 	// Trusts is a set of hashes to a which contract trusts.
 	Trusts WildUint160s `json:"trusts"`
 	// Extra is an implementation-defined user data.
-	Extra interface{} `json:"extra"`
+	Extra json.RawMessage `json:"extra"`
 }
 
 // NewManifest returns new manifest with necessary fields initialized.
@@ -48,6 +48,7 @@ func NewManifest(name string) *Manifest {
 		Groups:             []Group{},
 		Permissions:        []Permission{},
 		SupportedStandards: []string{},
+		Extra:              json.RawMessage("null"),
 	}
 	m.Trusts.Restrict()
 	return m
@@ -143,11 +144,7 @@ func (m *Manifest) ToStackItem() (stackitem.Item, error) {
 	}
 	extra := stackitem.Make("null")
 	if m.Extra != nil {
-		e, err := json.Marshal(m.Extra)
-		if err != nil {
-			return nil, err
-		}
-		extra = stackitem.NewByteArray(e)
+		extra = stackitem.NewByteArray(m.Extra)
 	}
 	return stackitem.NewStruct([]stackitem.Item{
 		stackitem.Make(m.Name),
@@ -238,8 +235,6 @@ func (m *Manifest) FromStackItem(item stackitem.Item) error {
 	if err != nil {
 		return err
 	}
-	if string(extra) == "null" {
-		return nil
-	}
-	return json.Unmarshal(extra, &m.Extra)
+	m.Extra = extra
+	return nil
 }
diff --git a/pkg/smartcontract/manifest/manifest_test.go b/pkg/smartcontract/manifest/manifest_test.go
index 60a917252..4532dcbba 100644
--- a/pkg/smartcontract/manifest/manifest_test.go
+++ b/pkg/smartcontract/manifest/manifest_test.go
@@ -278,7 +278,7 @@ func TestManifestToStackItem(t *testing.T) {
 			Trusts: WildUint160s{
 				Value: []util.Uint160{{1, 2, 3}},
 			},
-			Extra: "some extra data",
+			Extra: []byte(`even not a json allowed`),
 		}
 		check(t, expected)
 	})
@@ -335,14 +335,6 @@ func TestManifest_FromStackItemErrors(t *testing.T) {
 			stackitem.NewArray([]stackitem.Item{}),
 			stackitem.NewArray([]stackitem.Item{}),
 			stackitem.Null{}}),
-		"invalid extra": stackitem.NewStruct([]stackitem.Item{
-			stackitem.NewByteArray([]byte{}),
-			stackitem.NewArray([]stackitem.Item{}),
-			stackitem.NewArray([]stackitem.Item{}),
-			stackitem.NewStruct([]stackitem.Item{stackitem.NewArray([]stackitem.Item{}), stackitem.NewArray([]stackitem.Item{})}),
-			stackitem.NewArray([]stackitem.Item{}),
-			stackitem.NewArray([]stackitem.Item{}),
-			stackitem.NewByteArray([]byte("not a json"))}),
 	}
 	for name, errCase := range errCases {
 		t.Run(name, func(t *testing.T) {
diff --git a/scripts/compare-dumps.go b/scripts/compare-dumps.go
index f3ca4e48c..d18897d29 100644
--- a/scripts/compare-dumps.go
+++ b/scripts/compare-dumps.go
@@ -1,6 +1,9 @@
 package main
 
 import (
+	"bytes"
+	"encoding/base64"
+	"encoding/binary"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -12,6 +15,8 @@ import (
 	"github.com/urfave/cli"
 )
 
+var ledgerContractID = -2
+
 type dump []blockDump
 
 type blockDump struct {
@@ -39,15 +44,27 @@ func readFile(path string) (dump, error) {
 }
 
 func (d dump) normalize() {
+	ledgerIDBytes := make([]byte, 4)
+	binary.LittleEndian.PutUint32(ledgerIDBytes, uint32(ledgerContractID))
 	for i := range d {
+		var newStorage []storageOp
 		for j := range d[i].Storage {
+			keyBytes, err := base64.StdEncoding.DecodeString(d[i].Storage[j].Key)
+			if err != nil {
+				panic(fmt.Errorf("invalid key encoding: %w", err))
+			}
+			if bytes.HasPrefix(keyBytes, ledgerIDBytes) {
+				continue
+			}
 			if d[i].Storage[j].State == "Changed" {
 				d[i].Storage[j].State = "Added"
 			}
+			newStorage = append(newStorage, d[i].Storage[j])
 		}
-		sort.Slice(d[i].Storage, func(k, l int) bool {
-			return d[i].Storage[k].Key < d[i].Storage[l].Key
+		sort.Slice(newStorage, func(k, l int) bool {
+			return newStorage[k].Key < newStorage[l].Key
 		})
+		d[i].Storage = newStorage
 	}
 	// assume that d is already sorted by Block
 }
@@ -72,9 +89,6 @@ func compare(a, b string) error {
 		if blockA.Block != blockB.Block {
 			return fmt.Errorf("block number mismatch: %d vs %d", blockA.Block, blockB.Block)
 		}
-		if blockA.Size != blockB.Size {
-			return fmt.Errorf("block %d, changes number mismatch: %d vs %d", blockA.Block, blockA.Size, blockB.Size)
-		}
 		if len(blockA.Storage) != len(blockB.Storage) {
 			return fmt.Errorf("block %d, changes length mismatch: %d vs %d", blockA.Block, len(blockA.Storage), len(blockB.Storage))
 		}