diff --git a/src/application/clients/crux-wallet-client.ts b/src/application/clients/crux-wallet-client.ts
index 2c1fba37..3f3d40de 100644
--- a/src/application/clients/crux-wallet-client.ts
+++ b/src/application/clients/crux-wallet-client.ts
@@ -8,6 +8,7 @@ import {
     IAddress,
     IAddressMapping,
     IAssetMatcher,
+    ICruxDecryptedPrivateInformation,
     ICruxUserRegistrationStatus,
     SubdomainRegistrationStatus,
     SubdomainRegistrationStatusDetail,
@@ -233,7 +234,7 @@ export class CruxWalletClient {
     }
 
     @throwCruxClientError
-    public blacklistUsers = async (fullCruxIDs: string[]): Promise<{success: string[], failures: string[]}> => {
+    public putBlacklistedUsers = async (fullCruxIDs: string[]): Promise<{success: string[], failures: string[]}> => {
         await this.initPromise;
         const cruxUserWithKey = await this.getCruxUserByKey();
         if (!cruxUserWithKey) {
@@ -249,11 +250,24 @@ export class CruxWalletClient {
                 registeredCruxUsers.push(fullCruxID);
             }
         }
-        cruxUserWithKey.setBlacklistedCruxIDs(registeredCruxUsers);
+        const decryptedPrivateInfo: ICruxDecryptedPrivateInformation = (await this.keyManager!.symmetricDecrypt!(cruxUserWithKey.privateInformation)) as ICruxDecryptedPrivateInformation;
+        decryptedPrivateInfo.blacklistedCruxUsers = registeredCruxUsers;
+        cruxUserWithKey.setPrivateInformation(decryptedPrivateInfo, this.keyManager!);
         await this.cruxUserRepository.save(cruxUserWithKey, this.getKeyManager());
         return {success: registeredCruxUsers, failures};
     }
 
+    @throwCruxClientError
+    public getBlacklistedUsers = async (): Promise<string[]> => {
+        await this.initPromise;
+        const cruxUserWithKey = await this.getCruxUserByKey();
+        if (!cruxUserWithKey) {
+            throw ErrorHelper.getPackageError(null, PackageErrorCode.UserDoesNotExist);
+        }
+        const decryptedPrivateInfo: ICruxDecryptedPrivateInformation = (await this.keyManager!.symmetricDecrypt!(cruxUserWithKey.privateInformation)) as ICruxDecryptedPrivateInformation;
+        return decryptedPrivateInfo.blacklistedCruxUsers;
+    }
+
     // @throwCruxClientError
     public putPrivateAddressMap = async (fullCruxIDs: string[], newAddressMap: IAddressMapping): Promise<IPutPrivateAddressMapResult> => {
         await this.initPromise;
diff --git a/src/core/entities/crux-user.ts b/src/core/entities/crux-user.ts
index 5a68f730..a72453e7 100644
--- a/src/core/entities/crux-user.ts
+++ b/src/core/entities/crux-user.ts
@@ -30,10 +30,15 @@ export interface ICruxUserInformation {
 export interface ICruxUserData {
     configuration: ICruxUserConfiguration;
     privateAddresses: ICruxUserPrivateAddresses;
+    privateInformation: string;
 }
 
 export interface ICruxUserConfiguration {
     enabledAssetGroups: string[];
+    // blacklistedCruxUsers: string[];
+}
+
+export interface ICruxDecryptedPrivateInformation {
     blacklistedCruxUsers: string[];
 }
 
@@ -63,6 +68,7 @@ export class CruxUser {
     private cruxUserConfig!: ICruxUserConfiguration;
     private cruxUserPrivateAddresses!: ICruxUserPrivateAddresses;
     private cruxDomain!: CruxDomain;
+    private cruxPrivateInformation!: string;
 
     constructor(cruxUserSubdomain: string, cruxDomain: CruxDomain, addressMap: IAddressMapping, cruxUserInformation: ICruxUserInformation, cruxUserData: ICruxUserData, publicKey?: string) {
         this.setCruxDomain(cruxDomain);
@@ -72,6 +78,7 @@ export class CruxUser {
         this.setCruxUserConfig(cruxUserData.configuration);
         this.setPublicKey(publicKey);
         this.setCruxUserPrivateAddresses(cruxUserData.privateAddresses);
+        this.setCruxUserPrivateInformation(cruxUserData.privateInformation);
         log.debug("CruxUser initialised");
     }
     get cruxID() {
@@ -92,6 +99,9 @@ export class CruxUser {
     get privateAddresses() {
         return this.cruxUserPrivateAddresses;
     }
+    get privateInformation() {
+        return this.cruxPrivateInformation;
+    }
     public setSupportedAssetGroups = () => {
         this.cruxUserConfig.enabledAssetGroups = this.cruxDomain.config.supportedAssetGroups;
     }
@@ -112,8 +122,9 @@ export class CruxUser {
             throw new BaseError(null, "Not supported by the keyManager in use");
         }
     }
-    public setBlacklistedCruxIDs = (blacklistedCruxIDs: string[]) => {
-        this.cruxUserConfig.blacklistedCruxUsers = blacklistedCruxIDs;
+    public setPrivateInformation = async (decryptedPrivateInfo: ICruxDecryptedPrivateInformation, keyManager: IKeyManager) => {
+        const encryptedPrivateInfo: string = await keyManager.symmetricEncrypt!(decryptedPrivateInfo);
+        this.cruxPrivateInformation = encryptedPrivateInfo;
     }
     public getAddressFromAsset = async (asset: IGlobalAsset, keyManager?: IKeyManager): Promise<IAddress|undefined> => {
         let address: IAddress|undefined;
@@ -178,7 +189,7 @@ export class CruxUser {
     private setCruxUserConfig = (cruxUserConfiguration: ICruxUserConfiguration) => {
         // TODO: validation of the configurations
         this.cruxUserConfig = {
-            blacklistedCruxUsers: cruxUserConfiguration.blacklistedCruxUsers,
+            // blacklistedCruxUsers: cruxUserConfiguration.blacklistedCruxUsers,
             enabledAssetGroups: cruxUserConfiguration.enabledAssetGroups || [],
         };
     }
@@ -194,6 +205,9 @@ export class CruxUser {
             this.cruxUserPrivateAddresses = cruxUserPrivateAddresses;
         }
     }
+    private setCruxUserPrivateInformation = async (privateInfo: string) => {
+        this.cruxPrivateInformation = privateInfo;
+    }
 }
 
 export interface IAssetMatcher {
diff --git a/src/core/interfaces/key-manager.ts b/src/core/interfaces/key-manager.ts
index e4373134..46ba9dd9 100644
--- a/src/core/interfaces/key-manager.ts
+++ b/src/core/interfaces/key-manager.ts
@@ -3,6 +3,8 @@ export interface IKeyManager {
     getPubKey: () => Promise<string>;
     deriveSharedSecret?: (publicKey: string) => Promise<string>;
     decryptMessage?: (encryptedMessage: string) => Promise<string>;
+    symmetricEncrypt?: (content: object) => Promise<string>;
+    symmetricDecrypt?: (encryptedContent: string) => Promise<object>;
 }
 
 export const isInstanceOfKeyManager = (object: any) => {
diff --git a/src/infrastructure/implementations/basic-key-manager.ts b/src/infrastructure/implementations/basic-key-manager.ts
index 27901749..af98d380 100644
--- a/src/infrastructure/implementations/basic-key-manager.ts
+++ b/src/infrastructure/implementations/basic-key-manager.ts
@@ -43,6 +43,15 @@ export class BasicKeyManager implements IKeyManager {
         const decrypted = await ECIESEncryption.decrypt(toDecrypt, privateKey);
         return decrypted.toString();
     }
+    public symmetricEncrypt = async (content: object): Promise<string> => {
+        const encrypted = await Encryption.encryptJSON(content, await this.getDecryptedPrivateKey());
+        return JSON.stringify(encrypted);
+    }
+    public symmetricDecrypt = async (encryptedContent: string): Promise<object> => {
+        const encryptedContentObj = JSON.parse(encryptedContent);
+        const decrypted = await Encryption.decryptJSON(encryptedContentObj.encBuffer, encryptedContentObj.iv, await this.getDecryptedPrivateKey());
+        return decrypted;
+    }
     private init = async (privateKey: string, getEncryptionKey?: () => Promise<string>): Promise<void> => {
         let encryptionConstant: string;
         if (getEncryptionKey) {
diff --git a/src/infrastructure/implementations/blockstack-crux-user-repository.ts b/src/infrastructure/implementations/blockstack-crux-user-repository.ts
index b24086e7..a6023c1b 100644
--- a/src/infrastructure/implementations/blockstack-crux-user-repository.ts
+++ b/src/infrastructure/implementations/blockstack-crux-user-repository.ts
@@ -1,7 +1,8 @@
 import { publicKeyToAddress } from "blockstack";
+import { Encryption } from "src/packages/encryption";
 import {CruxDomain} from "../../core/entities/crux-domain";
 import { CruxSpec } from "../../core/entities/crux-spec";
-import { CruxUser, IAddressMapping, ICruxUserConfiguration, ICruxUserData, ICruxUserInformation, ICruxUserPrivateAddresses, SubdomainRegistrationStatus } from "../../core/entities/crux-user";
+import { CruxUser, IAddressMapping, ICruxDecryptedPrivateInformation, ICruxUserConfiguration, ICruxUserData, ICruxUserInformation, ICruxUserPrivateAddresses, SubdomainRegistrationStatus } from "../../core/entities/crux-user";
 import { ICruxBlockstackInfrastructure } from "../../core/interfaces";
 import {ICruxUserRepository, ICruxUserRepositoryOptions} from "../../core/interfaces/crux-user-repository";
 import { IKeyManager } from "../../core/interfaces/key-manager";
@@ -57,12 +58,15 @@ export class BlockstackCruxUserRepository implements ICruxUserRepository {
     }
     public create = async (cruxIdSubdomain: string, keyManager: IKeyManager): Promise<CruxUser> => {
         // Publishing an empty addressMap while registering the name to be fail safe
+        const privateInfo = {
+            blacklistedCruxUsers: [],
+        };
         const cruxUserData: ICruxUserData = {
             configuration: {
-                blacklistedCruxUsers: [],
                 enabledAssetGroups: [],
             },
             privateAddresses: {},
+            privateInformation: await keyManager.symmetricEncrypt!(privateInfo),
         };
         await this.putCruxpayObject(this.getCruxDomain().id, {}, keyManager);
         const cruxUserInformation = await this.blockstackService.registerCruxId(this.getCruxIdFromSubdomain(cruxIdSubdomain), this.infrastructure.gaiaHub, keyManager);
@@ -79,10 +83,10 @@ export class BlockstackCruxUserRepository implements ICruxUserRepository {
         let addressMap = {};
         let cruxUserData: ICruxUserData = {
             configuration: {
-                blacklistedCruxUsers: [],
                 enabledAssetGroups: [],
             },
             privateAddresses: {},
+            privateInformation: "",
         };
         let cruxpayPubKey;
         if (cruxUserInformation.registrationStatus.status === SubdomainRegistrationStatus.DONE) {
@@ -107,12 +111,15 @@ export class BlockstackCruxUserRepository implements ICruxUserRepository {
             return;
         }
         let addressMap = {};
+        const privateInfo = {
+            blacklistedCruxUsers: [],
+        };
         let cruxUserData: ICruxUserData = {
             configuration: {
-                blacklistedCruxUsers: [],
                 enabledAssetGroups: [],
             },
             privateAddresses: {},
+            privateInformation: await keyManager.symmetricEncrypt!(privateInfo),
         };
         let cruxpayPubKey = await keyManager.getPubKey();
         if ([SubdomainRegistrationStatus.DONE, SubdomainRegistrationStatus.PENDING].includes(cruxUserInformation.registrationStatus.status)) {
@@ -122,13 +129,13 @@ export class BlockstackCruxUserRepository implements ICruxUserRepository {
             const dereferencedCruxpayObject = this.dereferenceCruxpayObject(cruxpayObject);
             addressMap = dereferencedCruxpayObject.addressMap;
             if (dereferencedCruxpayObject.cruxUserData) {
-                cruxUserData = dereferencedCruxpayObject.cruxUserData;
+                cruxUserData = Object.assign(cruxUserData, dereferencedCruxpayObject.cruxUserData);
             }
         }
         return new CruxUser(cruxID.components.subdomain, this.getCruxDomain(), addressMap, cruxUserInformation, cruxUserData, cruxpayPubKey);
     }
     public save = async (cruxUser: CruxUser, keyManager: IKeyManager): Promise<CruxUser> => {
-        const cruxpayObject = this.constructCruxpayObject(cruxUser.getAddressMap(), cruxUser.info, cruxUser.config, cruxUser.privateAddresses);
+        const cruxpayObject = this.constructCruxpayObject(cruxUser.getAddressMap(), cruxUser.info, cruxUser.config, cruxUser.privateAddresses, cruxUser.privateInformation);
         await this.putCruxpayObject(cruxUser.domain.id, cruxpayObject, keyManager);
         return cruxUser;
     }
@@ -217,11 +224,12 @@ export class BlockstackCruxUserRepository implements ICruxUserRepository {
         const finalURL = await new GaiaService(gaiaHub, this.cacheStorage).uploadContentToGaiaHub(filename, content, keyManager);
         return finalURL;
     }
-    private constructCruxpayObject = (addressMap: IAddressMapping, userInformation: ICruxUserInformation, userConfiguration: ICruxUserConfiguration, privateAddresses: ICruxUserPrivateAddresses): ICruxpayObject => {
+    private constructCruxpayObject = (addressMap: IAddressMapping, userInformation: ICruxUserInformation, userConfiguration: ICruxUserConfiguration, privateAddresses: ICruxUserPrivateAddresses, privateInformation: string): ICruxpayObject => {
         const cruxpayObject: ICruxpayObject = cloneValue(addressMap);
         cruxpayObject.__userData__ = {
             configuration: userConfiguration,
             privateAddresses,
+            privateInformation,
         };
         return cruxpayObject;
     }