diff --git a/shared_model/interfaces/common_objects/signable_hash.hpp b/shared_model/interfaces/common_objects/signable_hash.hpp
index 40c091533b..da16dd7cc4 100644
--- a/shared_model/interfaces/common_objects/signable_hash.hpp
+++ b/shared_model/interfaces/common_objects/signable_hash.hpp
@@ -18,7 +18,6 @@
 #ifndef IROHA_SHARED_MODEL_SIGNABLE_HASH_HPP
 #define IROHA_SHARED_MODEL_SIGNABLE_HASH_HPP
 
-#include <boost/functional/hash.hpp>
 #include <unordered_set>
 
 #include "interfaces/common_objects/signature.hpp"
@@ -28,23 +27,28 @@ namespace shared_model {
 
   namespace interface {
     /**
-     * Hash class for SigWrapper type. It's required since std::unordered_set
-     * uses hash inside and it should be declared explicitly for user-defined
-     * types.
+     * Property class for SignatureSetType that contains hashing and comparison
+     * operations.
      */
-    class SignableHash {
+    class SignatureSetTypeOps {
      public:
       /**
-       * Operator which actually calculates hash. Uses boost::hash_combine to
-       * calculate hash from several fields.
-       * @param sig - item to find hash from
-       * @return calculated hash
+       * @param sig is item to find hash from
+       * @return calculated hash of public key
        */
       size_t operator()(const types::SignatureType &sig) const {
-        std::size_t seed = 0;
-        boost::hash_combine(seed, sig->publicKey().blob());
-        boost::hash_combine(seed, sig->signedData().blob());
-        return seed;
+        return std::hash<std::string>{}(sig->publicKey().hex());
+      }
+
+      /**
+       * Function for set elements uniqueness by public key
+       * @param lhs
+       * @param rhs
+       * @return true, if public keys are the same
+       */
+      bool operator()(const types::SignatureType &lhs,
+                      const types::SignatureType &rhs) const {
+        return lhs->publicKey() == rhs->publicKey();
       }
     };
     /**
@@ -54,8 +58,9 @@ namespace shared_model {
      * limitations: it requires to have write access for elements for some
      * internal operations.
      */
-    using SignatureSetType =
-        std::unordered_set<types::SignatureType, SignableHash>;
+    using SignatureSetType = std::unordered_set<types::SignatureType,
+                                                SignatureSetTypeOps,
+                                                SignatureSetTypeOps>;
   }  // namespace interface
 }  // namespace shared_model
 
diff --git a/test/module/irohad/consensus/yac/CMakeLists.txt b/test/module/irohad/consensus/yac/CMakeLists.txt
index d216caa87a..3cf40ea7c0 100644
--- a/test/module/irohad/consensus/yac/CMakeLists.txt
+++ b/test/module/irohad/consensus/yac/CMakeLists.txt
@@ -102,4 +102,6 @@ target_link_libraries(yac_crypto_provider_test
 addtest(supermajority_checker_test supermajority_checker_test.cpp)
 target_link_libraries(supermajority_checker_test
     yac
+    shared_model_cryptography
+    shared_model_stateless_validation
     )
diff --git a/test/module/irohad/consensus/yac/supermajority_checker_test.cpp b/test/module/irohad/consensus/yac/supermajority_checker_test.cpp
index 4ff61d4624..1714cb3c90 100644
--- a/test/module/irohad/consensus/yac/supermajority_checker_test.cpp
+++ b/test/module/irohad/consensus/yac/supermajority_checker_test.cpp
@@ -17,7 +17,14 @@
 
 #include <gtest/gtest.h>
 
+#include "backend/protobuf/common_objects/signature.hpp"
+#include "builders/protobuf/common_objects/proto_peer_builder.hpp"
+#include "builders/protobuf/common_objects/proto_signature_builder.hpp"
 #include "consensus/yac/impl/supermajority_checker_impl.hpp"
+#include "cryptography/public_key.hpp"
+#include "cryptography/signed.hpp"
+#include "interfaces/common_objects/peer.hpp"
+#include "interfaces/common_objects/types.hpp"
 #include "logger/logger.hpp"
 
 using namespace iroha::consensus::yac;
@@ -87,3 +94,38 @@ TEST_F(SupermajorityCheckerTest, RejectProofNegativeCase) {
   ASSERT_FALSE(hasReject(5, 6, 7));
   ASSERT_FALSE(hasReject(6, 6, 7));
 }
+
+/**
+ * @given a pair of peers and a pair different signatures by the first peer
+ * @when hasSupermajority is called
+ * @then it return false
+ */
+TEST_F(SupermajorityCheckerTest, PublicKeyUniqueness) {
+  using namespace shared_model::crypto;
+  std::vector<std::shared_ptr<shared_model::interface::Peer>> peers;
+  auto make_peer_key = [&peers](const std::string &key) {
+    PublicKey pub_key(key);
+    peers.emplace_back(clone(shared_model::proto::PeerBuilder()
+                                 .address("localhost")
+                                 .pubkey(pub_key)
+                                 .build()));
+    return pub_key;
+  };
+
+  auto peer_key = make_peer_key(std::string(32, '0'));
+  make_peer_key(std::string(32, '1'));
+
+  auto make_sig = [](const PublicKey &peer_key, const std::string &sig) {
+    return shared_model::interface::types::SignatureType(
+        std::static_pointer_cast<shared_model::interface::Signature>(
+            std::make_shared<shared_model::proto::Signature>(
+                shared_model::proto::SignatureBuilder()
+                    .publicKey(peer_key)
+                    .signedData(Signed(sig))
+                    .build())));
+  };
+  shared_model::interface::SignatureSetType signatures{make_sig(peer_key, "1"),
+                                                       make_sig(peer_key, "2")};
+
+  ASSERT_FALSE(hasSupermajority(signatures, peers));
+}