diff --git a/.env.devnet b/.env.devnet
index 6f114da..2060715 100644
--- a/.env.devnet
+++ b/.env.devnet
@@ -3,7 +3,7 @@ REACT_APP_RPC_URL_SHARD1=https://api.s1.ps.hmny.io/
 REACT_APP_RPC_URL_SHARD2=
 REACT_APP_RPC_URL_SHARD3=
 REACT_APP_AVAILABLE_SHARDS=0,1
-REACT_APP_EXPLORER_V1_API_URL=https://ctrver.t.hmny.io/
+REACT_APP_VERIFICATION_SERVICE_URL=https://ctrver.t.hmny.io/
 REACT_APP_INDEXER_IPFS_GATEWAY=https://ipfs.io/ipfs/
 REACT_APP_PROD_ADDRESS=https://explorer-v2-api.ps.hmny.io
 REACT_APP_CONTRACT_SHARD=0
diff --git a/.env.example b/.env.example
index cb0f159..0d11b7a 100644
--- a/.env.example
+++ b/.env.example
@@ -6,7 +6,7 @@ REACT_APP_RPC_URL_SHARD3=https://api.s3.t.hmny.io/
 # supported shards, comma separated 0,1,2,3
 REACT_APP_AVAILABLE_SHARDS=0,1,2,3
 # api for contract verification
-REACT_APP_EXPLORER_V1_API_URL=https://ctrver.t.hmny.io/
+REACT_APP_VERIFICATION_SERVICE_URL=https://ctrver.t.hmny.io/
 # IPFS gateway for tokens assets
 REACT_APP_INDEXER_IPFS_GATEWAY=https://ipfs.io/ipfs/
 # backend websocket API url
diff --git a/.env.testnet b/.env.testnet
index 0e8e9cd..2ecbd4b 100644
--- a/.env.testnet
+++ b/.env.testnet
@@ -3,7 +3,7 @@ REACT_APP_RPC_URL_SHARD1=https://api.s1.b.hmny.io/
 REACT_APP_RPC_URL_SHARD2=
 REACT_APP_RPC_URL_SHARD3=
 REACT_APP_AVAILABLE_SHARDS=0,1
-REACT_APP_EXPLORER_V1_API_URL=https://ctrver.t.hmny.io/
+REACT_APP_VERIFICATION_SERVICE_URL=https://ctrver.b.hmny.io/
 REACT_APP_INDEXER_IPFS_GATEWAY=https://ipfs.io/ipfs/
 REACT_APP_PROD_ADDRESS=https://api.explorer.pops.one/
 REACT_APP_CONTRACT_SHARD=0
diff --git a/src/api/explorerV1.ts b/src/api/explorerV1.ts
index 9d6e153..a7ad61c 100644
--- a/src/api/explorerV1.ts
+++ b/src/api/explorerV1.ts
@@ -1,6 +1,6 @@
 import { ShardID } from "src/types";
 import { AbiItem } from "web3-utils";
-import { getContractsByField } from "./client";
+import { config } from '../config'
 
 export interface IVerifyContractData {
   contractAddress: string;
@@ -65,7 +65,7 @@ export const verifyContractCode = async (data: IVerifyContractDataSendData) => {
     }
 
     const response = await fetch(
-      `${process.env.REACT_APP_EXPLORER_V1_API_URL}codeVerification`,
+      `${config.verificationServiceUrl}/codeVerification`,
       {
         method: "POST",
         mode: "cors",
@@ -86,7 +86,7 @@ export const verifyContractCode = async (data: IVerifyContractDataSendData) => {
   }
   else {
     const response = await fetch(
-      `${process.env.REACT_APP_EXPLORER_V1_API_URL}codeVerification`,
+      `${config.verificationServiceUrl}/codeVerification`,
       {
         method: "POST",
         mode: "cors",
@@ -113,7 +113,7 @@ export const verifyContractCode = async (data: IVerifyContractDataSendData) => {
 
 export const loadSourceCode = async (address: string, shard: ShardID): Promise<ISourceCode> => {
   const response = await fetch(
-    `${process.env.REACT_APP_EXPLORER_V1_API_URL}fetchContractCode?contractAddress=${address}&shard=${shard}`,
+    `${config.verificationServiceUrl}/fetchContractCode?contractAddress=${address}&shard=${shard}`,
     {
       mode: "cors",
       cache: "no-cache",
diff --git a/src/config/index.ts b/src/config/index.ts
index 84d5248..a5123e1 100644
--- a/src/config/index.ts
+++ b/src/config/index.ts
@@ -31,6 +31,7 @@ const contractShardId = +(process.env.REACT_APP_CONTRACT_SHARD || '0') as ShardI
 const oneCountryContractAddress = process.env.REACT_APP_ONE_COUNTRY_CONTRACT_ADDRESS || ''
 const oneCountryNFTContractAddress = process.env.REACT_APP_ONE_COUNTRY_NFT_CONTRACT_ADDRESS || ''
 const ipfsGateway = process.env.REACT_APP_INDEXER_IPFS_GATEWAY || ''
+const verificationServiceUrl = process.env.REACT_APP_VERIFICATION_SERVICE_URL || 'https://ctrver.t.hmny.io'
 
 export const config = {
   availableShards,
@@ -38,5 +39,6 @@ export const config = {
   contractShardId,
   oneCountryContractAddress,
   oneCountryNFTContractAddress,
-  ipfsGateway
+  ipfsGateway,
+  verificationServiceUrl
 }
diff --git a/src/pages/AddressPage/tabs/transactions/Transactions.tsx b/src/pages/AddressPage/tabs/transactions/Transactions.tsx
index b1b69ab..cedd971 100644
--- a/src/pages/AddressPage/tabs/transactions/Transactions.tsx
+++ b/src/pages/AddressPage/tabs/transactions/Transactions.tsx
@@ -130,18 +130,27 @@ export function Transactions(props: {
 
       // for transactions we display call method if any
       if (props.type === "transaction") {
-        const methodSignatures = await Promise.all(
-          txs.map((tx: any) => {
-            return tx.input && tx.input.length > 10
-              ? getByteCodeSignatureByHash([tx.input.slice(0, 10)])
-              : Promise.resolve([]);
+        const txInputsMap: Record<string, string> = {}
+        txs.forEach((tx) => {
+          if(tx.input && tx.input.length > 10) {
+            txInputsMap[tx.input.slice(0, 10)] = ''
+          }
+        })
+
+        await Promise.all(
+          Object.keys(txInputsMap).map(async (txInput: string) => {
+            txInputsMap[txInput] = await getByteCodeSignatureByHash([txInput]);
           })
         );
 
-        txs = txs.map((l, i) => ({
-          ...l,
-          signatures: methodSignatures[i],
-        }));
+        txs = txs.map((tx, i) => {
+          return {
+            ...tx,
+            signatures: tx.input
+              ? txInputsMap[tx.input.slice(0, 10)] || []
+              : [],
+          }
+        });
       }
 
       txs = txs.map((tx: any) => {