diff --git a/backend/src/ipfs.ts b/backend/src/ipfs.ts
index 646b3bdc..3f840e68 100644
--- a/backend/src/ipfs.ts
+++ b/backend/src/ipfs.ts
@@ -7,9 +7,12 @@ dotenv.config();
 interface Proposal {
   text: string;
   address: string;
+  starknet_id?: string;
 }
 
-const PINATA_JWT = process.env.PINATA_JWT || "";
+const ADDRES_REGEX: RegExp = /^0x0[0-9a-fA-F]{63}$/;
+const MAX_LENGTH: number = 200;
+const PINATA_JWT: string = process.env.PINATA_JWT || "";
 
 const pinToIPFS = async (proposal: Proposal) => {
   const url = "https://api.pinata.cloud/pinning/pinFileToIPFS";
@@ -34,22 +37,32 @@ const pinToIPFS = async (proposal: Proposal) => {
 };
 
 export const submitProposal = async (req: Request, res: Response) => {
-  const { text, address } = req.body;
+  const { text, address }: { text: string; address: string } = req.body;
 
   if (!text || !address) {
     return res.status(400).json({ error: "Missing text or address" });
   }
 
+  if (text.length > MAX_LENGTH) {
+    return res.status(400).json({
+      error: `Text exceeds maximum length of ${MAX_LENGTH} characters`
+    });
+  }
+
+  if (!ADDRES_REGEX.test(address)) {
+    return res.status(400).json({ error: "Invalid address" });
+  }
+
   const proposalData: Proposal = {
     text,
     address
   };
 
-  // const starknetId = await getStarknetId(address);
+  const starknetId = await getStarknetId(address);
 
-  // if (starknetId) {
-  //   proposalData.starknet_id = starknetId;
-  // }
+  if (starknetId) {
+    proposalData.starknet_id = starknetId;
+  }
 
   try {
     const pin = await pinToIPFS(proposalData);
diff --git a/backend/src/starknet.ts b/backend/src/starknet.ts
index fd1d46a7..62671bb9 100644
--- a/backend/src/starknet.ts
+++ b/backend/src/starknet.ts
@@ -1,11 +1,17 @@
 import { StarknetIdNavigator } from "starknetid.js";
 import { RpcProvider, constants } from "starknet";
+import * as dotenv from "dotenv";
+
+dotenv.config();
+
+const NODE_URL: string = process.env.NODE_URL || "";
 
 export const getStarknetId = async (
   address: string
 ): Promise<string | null> => {
   const provider = new RpcProvider({
-    nodeUrl: "your_mainnet_node_url",
+    nodeUrl: NODE_URL,
+    chainId: constants.StarknetChainId.SN_MAIN
   });
 
   const starknetIdNavigator = new StarknetIdNavigator(
@@ -13,7 +19,7 @@ export const getStarknetId = async (
     constants.StarknetChainId.SN_MAIN
   );
 
-  const domain = await provider.getStarkName(address);
+  const domain = await starknetIdNavigator.getStarkName(address);
   const id = await starknetIdNavigator.getStarknetId(domain);
 
   return id;