diff --git a/packages/provider/src/tasks/powCaptcha/powTasks.ts b/packages/provider/src/tasks/powCaptcha/powTasks.ts
index ad0e3618ed..0e1edb424c 100644
--- a/packages/provider/src/tasks/powCaptcha/powTasks.ts
+++ b/packages/provider/src/tasks/powCaptcha/powTasks.ts
@@ -60,11 +60,13 @@ export class PowCaptchaManager {
 		powDifficulty?: number,
 	): Promise<PoWCaptcha> {
 		const difficulty = powDifficulty || DEFAULT_POW_DIFFICULTY;
-
 		const requestedAtTimestamp = Date.now();
 
+		// Create nonce for the challenge
+		const nonce = Math.floor(Math.random() * 1000000);
+
 		// Use blockhash, userAccount and dappAccount for string for challenge
-		const challenge: PoWChallengeId = `${requestedAtTimestamp}___${userAccount}___${dappAccount}`;
+		const challenge: PoWChallengeId = `${requestedAtTimestamp}___${userAccount}___${dappAccount}___${nonce}`;
 		const challengeSignature = u8aToHex(this.pair.sign(stringToHex(challenge)));
 		return {
 			challenge,
diff --git a/packages/types/src/datasets/captcha.ts b/packages/types/src/datasets/captcha.ts
index ced1d4af58..deec4a478a 100644
--- a/packages/types/src/datasets/captcha.ts
+++ b/packages/types/src/datasets/captcha.ts
@@ -128,7 +128,7 @@ export const PowChallengeIdSchema = custom<PoWChallengeId>((val: any) => {
 	const valSplit = val.split(POW_SEPARATOR);
 	try {
 		Number.parseInt(valSplit[0]);
-		return valSplit.length === 3;
+		return valSplit.length === 4;
 	} catch (e) {
 		return false;
 	}