diff --git a/src/Polkadot/Extrinsic.cpp b/src/Polkadot/Extrinsic.cpp
index 8ec0b509c6e..b88e5e9a843 100644
--- a/src/Polkadot/Extrinsic.cpp
+++ b/src/Polkadot/Extrinsic.cpp
@@ -407,8 +407,8 @@ Data Extrinsic::encodePayload() const {
     }
 
     if (use_new_spec) {
-      // mode (currently always 0)
-      data.push_back(0x00);
+        // mode (currently always 0)
+        data.push_back(0x00);
     }
 
     // specVersion
@@ -421,14 +421,16 @@ Data Extrinsic::encodePayload() const {
     append(data, blockHash);
 
     if (use_new_spec) {
-      // empty metadata hash
-      data.push_back(0x00);
+        // empty metadata hash
+        data.push_back(0x00);
     }
     return data;
 }
 
 Data Extrinsic::encodeSignature(const PublicKey& signer, const Data& signature) const {
     Data data;
+    auto use_new_spec = requires_new_spec_compatbility(network, specVersion);
+
     // version header
     append(data, Data{extrinsicFormat | signedBit});
     // signer public key
@@ -439,10 +441,17 @@ Data Extrinsic::encodeSignature(const PublicKey& signer, const Data& signature)
     append(data, signature);
     // era / nonce / tip
     append(data, encodeEraNonceTip());
+
     // fee asset id
     if (!feeAssetId.empty()) {
         append(data, feeAssetId);
     }
+
+    if (use_new_spec) {
+        // mode (currently always 0)
+        data.push_back(0x00);
+    }
+
     // call
     append(data, call);
     // append length
diff --git a/tests/chains/Polkadot/SignerTests.cpp b/tests/chains/Polkadot/SignerTests.cpp
index ca1631603be..7e712160f51 100644
--- a/tests/chains/Polkadot/SignerTests.cpp
+++ b/tests/chains/Polkadot/SignerTests.cpp
@@ -654,4 +654,43 @@ TEST(PolkadotSigner, Kusama_SignBond_NoController) {
     ASSERT_EQ(hex(output.encoded()), "c101840088dc3417d5058ec4b4503e0c12ea1a0a89be200fe98922423d4334014fa6b0ee00bc4d7a166bd1e7e2bfe9b53e81239c9e340d5a326f17c0a3d2768fcc127f20f4f85d888ecb90aa3ed9a0943f8ae8116b9a19747e563c8d8151dfe3b1b5deb40ca5020c0006000700b08ef01b02");
 }
 
+TEST(PolkadotSigner, SignTransfer_KusamaNewSpec) {
+    auto toAddress = Address("DAbYHrSQTULYZsuA1kvH2cQ33oBsCxxSRPM1XkhzGLeJuHG", ss58Prefix(TWCoinTypeKusama));
+
+    auto input = Proto::SigningInput();
+    auto genesisHashData = parse_hex("0xb0a8d493285c2df73290dfb7e61f870f17b41801197a149ca93654499ea3dafe");
+    input.set_genesis_hash(genesisHashData.data(), genesisHashData.size());
+    auto blockHashData = parse_hex("0x0c731c2b7f5332749432eae61cd5a919592965b28181cf9b73b0a1258ea73303");
+    input.set_block_hash(blockHashData.data(), blockHashData.size());
+    input.set_nonce(150);
+    input.set_spec_version(1002005);
+    {
+        PublicKey publicKey = privateKeyThrow2.getPublicKey(TWPublicKeyTypeED25519);
+        Address address = Address(publicKey);
+        EXPECT_EQ(address.string(), addressThrow2);
+    }
+    input.set_private_key(privateKeyThrow2.bytes.data(), privateKeyThrow2.bytes.size());
+    input.set_network(ss58Prefix(TWCoinTypeKusama));
+    input.set_transaction_version(26);
+
+    // era: for blockhash and block number, use curl -H "Content-Type: application/json" -H "Accept: text/plain" https://<polkadot-rpc-url>/transaction/material?noMeta=true
+    auto era = input.mutable_era();
+    era->set_block_number(23610713);
+    era->set_period(64);
+
+    auto balanceCall = input.mutable_balance_call();
+    auto transfer = balanceCall->mutable_transfer();
+    auto value = store(uint256_t(2000000000)); // 0.2
+    transfer->set_to_address(toAddress.string());
+    transfer->set_value(value.data(), value.size());
+
+    auto extrinsic = Extrinsic(input);
+    auto preimage = extrinsic.encodePayload();
+    EXPECT_EQ(hex(preimage), "0400001a2447c661c9b168bba4a2a178baef7d79eee006c1d145ffc832be76ff6ee9ce0300943577950159020000154a0f001a000000b0a8d493285c2df73290dfb7e61f870f17b41801197a149ca93654499ea3dafe0c731c2b7f5332749432eae61cd5a919592965b28181cf9b73b0a1258ea7330300");
+
+    auto output = Signer::sign(input);
+    EXPECT_EQ(hex(output.encoded()), "450284009dca538b7a925b8ea979cc546464a3c5f81d2398a3a272f6f93bdf4803f2f78300fc5a463d3b6972ac7e0b701110f9d95d377be5b6a2f356765553104c04765fc0066c235c11dabde650d487760dc310003d607abceaf85a0a0f47f1a90e3680029501590200000400001a2447c661c9b168bba4a2a178baef7d79eee006c1d145ffc832be76ff6ee9ce0300943577");
+}
+
+
 } // namespace TW::Polkadot::tests