diff --git a/packages/rln/src/contract/rln_base_contract.ts b/packages/rln/src/contract/rln_base_contract.ts
index 2c46810fbe..1a0cff7cf4 100644
--- a/packages/rln/src/contract/rln_base_contract.ts
+++ b/packages/rln/src/contract/rln_base_contract.ts
@@ -546,7 +546,7 @@ export class RLNBaseContract {
         membership: {
           address,
           treeIndex: membershipId,
-          chainId: network.chainId,
+          chainId: network.chainId.toString(),
           rateLimit: decodedData.membershipRateLimit.toNumber()
         }
       };
@@ -640,7 +640,7 @@ export class RLNBaseContract {
         membership: {
           address,
           treeIndex: membershipId,
-          chainId: network.chainId,
+          chainId: network.chainId.toString(),
           rateLimit: decodedData.membershipRateLimit.toNumber()
         }
       };
diff --git a/packages/rln/src/credentials_manager.ts b/packages/rln/src/credentials_manager.ts
index fa3b9cee80..fb60ac0b48 100644
--- a/packages/rln/src/credentials_manager.ts
+++ b/packages/rln/src/credentials_manager.ts
@@ -155,7 +155,7 @@ export class RLNCredentialsManager {
       LINEA_CONTRACT.address;
 
     if (address === LINEA_CONTRACT.address) {
-      chainId = LINEA_CONTRACT.chainId;
+      chainId = LINEA_CONTRACT.chainId.toString();
       log.info(`Using Linea contract with chainId: ${chainId}`);
     }
 
@@ -163,7 +163,7 @@ export class RLNCredentialsManager {
     const currentChainId = await signer.getChainId();
     log.info(`Current chain ID: ${currentChainId}`);
 
-    if (chainId && chainId !== currentChainId) {
+    if (chainId && chainId !== currentChainId.toString()) {
       log.error(
         `Chain ID mismatch: contract=${chainId}, current=${currentChainId}`
       );
@@ -236,7 +236,7 @@ export class RLNCredentialsManager {
     const chainId = credentials.membership.chainId;
     const network = await this.contract.provider.getNetwork();
     const currentChainId = network.chainId;
-    if (chainId !== currentChainId) {
+    if (chainId !== currentChainId.toString()) {
       throw Error(
         `Failed to verify chain coordinates: credentials chainID=${chainId} is not equal to registryContract chainID=${currentChainId}`
       );
diff --git a/packages/rln/src/keystore/keystore.ts b/packages/rln/src/keystore/keystore.ts
index f39bfaf8a0..542970e0fc 100644
--- a/packages/rln/src/keystore/keystore.ts
+++ b/packages/rln/src/keystore/keystore.ts
@@ -275,7 +275,7 @@ export class Keystore {
           treeIndex: _.get(obj, "treeIndex"),
           chainId: _.get(obj, "membershipContract.chainId"),
           address: _.get(obj, "membershipContract.address"),
-          rateLimit: _.get(obj, "membershipContract.rateLimit")
+          rateLimit: _.get(obj, "userMessageLimit")
         }
       };
     } catch (err) {
@@ -284,11 +284,18 @@ export class Keystore {
     }
   }
 
-  private static fromArraylikeToBytes(obj: {
-    [key: number]: number;
-  }): Uint8Array {
-    const bytes = [];
+  private static fromArraylikeToBytes(
+    obj:
+      | number[]
+      | {
+          [key: number]: number;
+        }
+  ): Uint8Array {
+    if (Array.isArray(obj)) {
+      return new Uint8Array(obj);
+    }
 
+    const bytes = [];
     let index = 0;
     let lastElement = obj[index];
 
@@ -316,15 +323,16 @@ export class Keystore {
       JSON.stringify({
         treeIndex: options.membership.treeIndex,
         identityCredential: {
-          idCommitment: options.identity.IDCommitment,
-          idNullifier: options.identity.IDNullifier,
-          idSecretHash: options.identity.IDSecretHash,
-          idTrapdoor: options.identity.IDTrapdoor
+          idCommitment: Array.from(options.identity.IDCommitment),
+          idNullifier: Array.from(options.identity.IDNullifier),
+          idSecretHash: Array.from(options.identity.IDSecretHash),
+          idTrapdoor: Array.from(options.identity.IDTrapdoor)
         },
         membershipContract: {
           chainId: options.membership.chainId,
           address: options.membership.address
-        }
+        },
+        userMessageLimit: options.membership.rateLimit
       })
     );
   }
diff --git a/packages/rln/src/keystore/types.ts b/packages/rln/src/keystore/types.ts
index a14867c1e1..89d240edfe 100644
--- a/packages/rln/src/keystore/types.ts
+++ b/packages/rln/src/keystore/types.ts
@@ -8,7 +8,7 @@ export type Password = string | Uint8Array;
 // see reference
 // https://github.com/waku-org/nwaku/blob/f05528d4be3d3c876a8b07f9bb7dfaae8aa8ec6e/waku/waku_keystore/protocol_types.nim#L111
 export type MembershipInfo = {
-  chainId: number;
+  chainId: string;
   address: string;
   treeIndex: number;
   rateLimit: number;