diff --git a/go.mod b/go.mod
index 6008d15..ff9f5ad 100644
--- a/go.mod
+++ b/go.mod
@@ -2,7 +2,10 @@ module git.frostfs.info/TrueCloudLab/policy-engine
 
 go 1.20
 
-require github.com/stretchr/testify v1.8.4
+require (
+	github.com/nspcc-dev/neo-go v0.103.0
+	github.com/stretchr/testify v1.8.4
+)
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
diff --git a/go.sum b/go.sum
index 07efd47..f3f7b8c 100644
--- a/go.sum
+++ b/go.sum
@@ -7,10 +7,13 @@ github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/nspcc-dev/neo-go v0.103.0 h1:UVyWPhzZdfYFG35ORP3FRDLh8J/raRQ6m8SptDdlgfM=
+github.com/nspcc-dev/neo-go v0.103.0/go.mod h1:x+wmcYqpZYJwLp1l/pHZrqNp3RSWlkMymWGDij3/OPo=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+golang.org/x/crypto v0.14.0 h1:wBqGXzWJW6m1XrIKlAH0Hs1JJ7+9KBwnIO8v66Q9cHc=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
diff --git a/iam/converter_test.go b/iam/converter_test.go
index 4373e30..7ec177d 100644
--- a/iam/converter_test.go
+++ b/iam/converter_test.go
@@ -669,7 +669,7 @@ func TestComplexNativeConditions(t *testing.T) {
 	requireChainRulesMatch(t, expected.Rules, nativeChain.Rules)
 
 	s := inmemory.NewInMemory()
-	err = s.MorphRuleChainStorage().AddMorphRuleChain("name", engine.NamespaceTarget("ns"), nativeChain)
+	_, _, err = s.MorphRuleChainStorage().AddMorphRuleChain("name", engine.NamespaceTarget("ns"), nativeChain)
 	require.NoError(t, err)
 
 	for _, tc := range []struct {
@@ -933,7 +933,7 @@ func TestComplexS3Conditions(t *testing.T) {
 	requireChainRulesMatch(t, expected.Rules, s3Chain.Rules)
 
 	s := inmemory.NewInMemory()
-	err = s.MorphRuleChainStorage().AddMorphRuleChain("name", engine.NamespaceTarget("ns"), s3Chain)
+	_, _, err = s.MorphRuleChainStorage().AddMorphRuleChain("name", engine.NamespaceTarget("ns"), s3Chain)
 	require.NoError(t, err)
 
 	for _, tc := range []struct {
diff --git a/pkg/engine/inmemory/morph_storage.go b/pkg/engine/inmemory/morph_storage.go
index cd4b5a9..72b5439 100644
--- a/pkg/engine/inmemory/morph_storage.go
+++ b/pkg/engine/inmemory/morph_storage.go
@@ -3,6 +3,7 @@ package inmemory
 import (
 	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/chain"
 	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/engine"
+	"github.com/nspcc-dev/neo-go/pkg/util"
 )
 
 type inmemoryMorphRuleChainStorage struct {
@@ -17,7 +18,7 @@ func NewInmemoryMorphRuleChainStorage() engine.MorphRuleChainStorage {
 	}
 }
 
-func (s *inmemoryMorphRuleChainStorage) AddMorphRuleChain(name chain.Name, target engine.Target, c *chain.Chain) (err error) {
+func (s *inmemoryMorphRuleChainStorage) AddMorphRuleChain(name chain.Name, target engine.Target, c *chain.Chain) (_ util.Uint256, _ uint32, err error) {
 	switch target.Type {
 	case engine.Namespace:
 		_, err = s.nameToNamespaceChains.AddOverride(name, target, c)
@@ -29,15 +30,16 @@ func (s *inmemoryMorphRuleChainStorage) AddMorphRuleChain(name chain.Name, targe
 	return
 }
 
-func (s *inmemoryMorphRuleChainStorage) RemoveMorphRuleChain(name chain.Name, target engine.Target, chainID chain.ID) error {
+func (s *inmemoryMorphRuleChainStorage) RemoveMorphRuleChain(name chain.Name, target engine.Target, chainID chain.ID) (_ util.Uint256, _ uint32, err error) {
 	switch target.Type {
 	case engine.Namespace:
-		return s.nameToNamespaceChains.RemoveOverride(name, target, chainID)
+		err = s.nameToNamespaceChains.RemoveOverride(name, target, chainID)
 	case engine.Container:
-		return s.nameToContainerChains.RemoveOverride(name, target, chainID)
+		err = s.nameToContainerChains.RemoveOverride(name, target, chainID)
 	default:
-		return engine.ErrUnknownTarget
+		err = engine.ErrUnknownTarget
 	}
+	return
 }
 
 func (s *inmemoryMorphRuleChainStorage) ListMorphRuleChains(name chain.Name, target engine.Target) ([]*chain.Chain, error) {
diff --git a/pkg/engine/interface.go b/pkg/engine/interface.go
index 14c1301..8d11466 100644
--- a/pkg/engine/interface.go
+++ b/pkg/engine/interface.go
@@ -3,6 +3,7 @@ package engine
 import (
 	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/chain"
 	"git.frostfs.info/TrueCloudLab/policy-engine/pkg/resource"
+	"github.com/nspcc-dev/neo-go/pkg/util"
 )
 
 type ChainRouter interface {
@@ -93,10 +94,13 @@ func ContainerTarget(container string) Target {
 // MorphRuleChainStorage is the interface to manage chains from the chain storage.
 // Basically, this implies that the storage manages rules stored in policy contract.
 type MorphRuleChainStorage interface {
-	AddMorphRuleChain(name chain.Name, target Target, c *chain.Chain) error
+	// AddMorphRuleChain adds a chain rule to the policy contract and returns transaction hash, VUB and error.
+	AddMorphRuleChain(name chain.Name, target Target, c *chain.Chain) (util.Uint256, uint32, error)
 
-	RemoveMorphRuleChain(name chain.Name, target Target, chainID chain.ID) error
+	// RemoveMorphRuleChain removes a chain rule to the policy contract and returns transaction hash, VUB and error.
+	RemoveMorphRuleChain(name chain.Name, target Target, chainID chain.ID) (util.Uint256, uint32, error)
 
+	// ListMorphRuleChains just lists deserialized chains.
 	ListMorphRuleChains(name chain.Name, target Target) ([]*chain.Chain, error)
 }