diff --git a/common/ir.go b/common/ir.go
index fbc813a..a639bf1 100644
--- a/common/ir.go
+++ b/common/ir.go
@@ -25,20 +25,20 @@ func AlphabetNodes() []interop.PublicKey {
 }
 
 // AlphabetAddress returns multi address of alphabet public keys.
-func AlphabetAddress() []byte {
+func AlphabetAddress() interop.Hash160 {
 	alphabet := neo.GetCommittee()
 	return Multiaddress(alphabet, false)
 }
 
 // CommitteeAddress returns multi address of committee.
-func CommitteeAddress() []byte {
+func CommitteeAddress() interop.Hash160 {
 	committee := neo.GetCommittee()
 	return Multiaddress(committee, true)
 }
 
 // Multiaddress returns default multisignature account address for N keys.
 // If committee set to true, it is `M = N/2+1` committee account.
-func Multiaddress(n []interop.PublicKey, committee bool) []byte {
+func Multiaddress(n []interop.PublicKey, committee bool) interop.Hash160 {
 	threshold := len(n)*2/3 + 1
 	if committee {
 		threshold = len(n)/2 + 1