diff --git a/src/interfaces.ts b/src/interfaces.ts
index b87c23a..4795c22 100644
--- a/src/interfaces.ts
+++ b/src/interfaces.ts
@@ -157,6 +157,7 @@ export interface JWTLoginParams {
 export interface Web3AuthState {
   postBoxKey?: string;
   signatures?: string[];
+  postboxKeyNodeIndexes?: number[];
   userInfo?: UserInfo;
   tssShareIndex?: number;
   tssPubKey?: Buffer;
@@ -444,6 +445,7 @@ export interface SessionData {
    */
   oAuthKey?: string;
   postBoxKey?: string;
+  postboxKeyNodeIndexes?: number[];
   factorKey: string;
   tssShareIndex: number;
   tssPubKey: string;
diff --git a/src/mpcCoreKit.ts b/src/mpcCoreKit.ts
index b509543..f66dd1c 100644
--- a/src/mpcCoreKit.ts
+++ b/src/mpcCoreKit.ts
@@ -73,9 +73,9 @@ import {
 export class Web3AuthMPCCoreKit implements ICoreKit {
   public state: Web3AuthState = { accountIndex: 0 };
 
-  private options: Web3AuthOptionsWithDefaults;
+  public torusSp: TSSTorusServiceProvider | null = null;
 
-  private torusSp: TSSTorusServiceProvider | null = null;
+  private options: Web3AuthOptionsWithDefaults;
 
   private storageLayer: TorusStorageLayer | null = null;
 
@@ -333,6 +333,7 @@ export class Web3AuthMPCCoreKit implements ICoreKit {
 
         this.updateState({
           postBoxKey: this._getPostBoxKey(loginResponse),
+          postboxKeyNodeIndexes: loginResponse.nodesData?.nodeIndexes,
           userInfo: loginResponse.userInfo,
           signatures: this._getSignatures(loginResponse.sessionData.sessionTokenData),
         });
@@ -347,6 +348,7 @@ export class Web3AuthMPCCoreKit implements ICoreKit {
 
         this.updateState({
           postBoxKey: this._getPostBoxKey(loginResponse),
+          postboxKeyNodeIndexes: loginResponse.nodesData?.nodeIndexes,
           userInfo: loginResponse.userInfo[0],
           signatures: this._getSignatures(loginResponse.sessionData.sessionTokenData),
         });
@@ -406,6 +408,7 @@ export class Web3AuthMPCCoreKit implements ICoreKit {
 
       this.updateState({
         postBoxKey,
+        postboxKeyNodeIndexes: loginResponse.nodesData?.nodeIndexes || [],
         userInfo: { ...parseToken(idToken), verifier, verifierId },
         signatures: this._getSignatures(loginResponse.sessionData.sessionTokenData),
       });
@@ -438,6 +441,7 @@ export class Web3AuthMPCCoreKit implements ICoreKit {
         }
         this.updateState({
           postBoxKey: this._getPostBoxKey(data),
+          postboxKeyNodeIndexes: data.nodesData?.nodeIndexes || [],
           userInfo: data.userInfo,
           signatures: this._getSignatures(data.sessionData.sessionTokenData),
         });
@@ -450,6 +454,7 @@ export class Web3AuthMPCCoreKit implements ICoreKit {
         }
         this.updateState({
           postBoxKey: this._getPostBoxKey(data),
+          postboxKeyNodeIndexes: data.nodesData?.nodeIndexes || [],
           userInfo: data.userInfo[0],
           signatures: this._getSignatures(data.sessionData.sessionTokenData),
         });
@@ -1121,6 +1126,7 @@ export class Web3AuthMPCCoreKit implements ICoreKit {
       this.updateState({
         factorKey: new BN(result.factorKey, "hex"),
         postBoxKey,
+        postboxKeyNodeIndexes: result.postboxKeyNodeIndexes || [],
         tssShareIndex: result.tssShareIndex,
         tssPubKey: this.tkey.getTSSPub().toSEC1(this.tKey.tssCurve, false),
         signatures: result.signatures,
@@ -1132,14 +1138,14 @@ export class Web3AuthMPCCoreKit implements ICoreKit {
   }
 
   private async createSession() {
-    if (!this.sessionManager) {
+    if (!this.options.disableSessionManager && !this.sessionManager) {
       throw new Error("sessionManager is not available");
     }
 
     try {
       const sessionId = SessionManager.generateRandomSessionKey();
       this.sessionManager.sessionId = sessionId;
-      const { postBoxKey, factorKey, userInfo, tssShareIndex, tssPubKey } = this.state;
+      const { postBoxKey, factorKey, userInfo, tssShareIndex, tssPubKey, postboxKeyNodeIndexes } = this.state;
       if (!this.state.factorKey) {
         throw CoreKitError.factorKeyNotPresent("factorKey not present in state when creating session.");
       }
@@ -1151,6 +1157,7 @@ export class Web3AuthMPCCoreKit implements ICoreKit {
       }
       const payload: SessionData = {
         postBoxKey,
+        postboxKeyNodeIndexes: postboxKeyNodeIndexes || [],
         factorKey: factorKey?.toString("hex"),
         tssShareIndex: tssShareIndex as number,
         tssPubKey: Buffer.from(tssPubKey).toString("hex"),