diff --git a/src/app/lib/genesisAPI/index.ts b/src/app/lib/genesisAPI/index.ts
index a3abf4a57..9647ffa3a 100644
--- a/src/app/lib/genesisAPI/index.ts
+++ b/src/app/lib/genesisAPI/index.ts
@@ -23,7 +23,7 @@
 import queryString from 'query-string';
 import urlJoin from 'url-join';
 import urlTemplate from 'url-template';
-import { IUIDResponse, ILoginRequest, ILoginResponse, IRowRequest, IRowResponse, IPageResponse, IBlockResponse, IMenuResponse, IContentRequest, IContentResponse, IContentTestRequest, IContentJsonRequest, IContentJsonResponse, ITableResponse, ISegmentRequest, ITablesResponse, IDataRequest, IDataResponse, ISectionsRequest, ISectionsResponse, IHistoryRequest, IHistoryResponse, INotificationsRequest, IParamResponse, IParamsRequest, IParamsResponse, IParamRequest, ITemplateRequest, IContractRequest, IContractResponse, IContractsResponse, ITableRequest, TConfigRequest, ISystemParamsRequest, ISystemParamsResponse, IContentHashRequest, IContentHashResponse, TTxCallRequest, TTxCallResponse, TTxStatusRequest, TTxStatusResponse, ITxStatus, IKeyInfo } from 'genesis/api';
+import { IUIDResponse, ILoginRequest, ILoginResponse, IRowRequest, IRowResponse, IPageResponse, IBlockResponse, IMenuResponse, IContentRequest, IContentResponse, IContentTestRequest, IContentJsonRequest, IContentJsonResponse, ITableResponse, ISegmentRequest, ITablesResponse, IDataRequest, IDataResponse, ISectionsRequest, ISectionsResponse, IHistoryRequest, IHistoryResponse, INotificationsRequest, IParamResponse, IParamsRequest, IParamsResponse, IParamRequest, ITemplateRequest, IContractRequest, IContractResponse, IContractsResponse, ITableRequest, TConfigRequest, ISystemParamsRequest, ISystemParamsResponse, IContentHashRequest, IContentHashResponse, TTxCallRequest, TTxCallResponse, TTxStatusRequest, TTxStatusResponse, ITxStatus, IKeyInfo, IPageValidatorsResponse, IPageValidatorsRequest } from 'genesis/api';
 
 export type TRequestMethod =
     'get' |
@@ -291,6 +291,10 @@ class GenesisAPI {
         })
     });
 
+    public pageValidatorsCount = this.setEndpoint<IPageValidatorsRequest, IPageValidatorsResponse>('get', 'page/validators_count/{name}', {
+        requestTransformer: request => null
+    });
+
     // Transactions
     private _txSend = this.setSecuredEndpoint<{ [key: string]: Blob }, { hashes: { [key: string]: string } }>('post', 'sendTx');
     public txSend = <T>(params: TTxCallRequest<T>) => this._txSend(params) as Promise<TTxCallResponse<T>>;
diff --git a/src/app/modules/engine/util/NodeObservable.ts b/src/app/modules/engine/util/NodeObservable.ts
index 23b66825f..92a2301ef 100644
--- a/src/app/modules/engine/util/NodeObservable.ts
+++ b/src/app/modules/engine/util/NodeObservable.ts
@@ -23,8 +23,22 @@
 import { Observable } from 'rxjs';
 import { IAPIDependency } from 'modules/dependencies';
 
+function shuffle<T>(array: Array<T>) {
+    let currentIndex = array.length, temporaryValue, randomIndex;
+    while (0 !== currentIndex) {
+        randomIndex = Math.floor(Math.random() * currentIndex);
+        currentIndex -= 1;
+
+        temporaryValue = array[currentIndex];
+        array[currentIndex] = array[randomIndex];
+        array[randomIndex] = temporaryValue;
+    }
+
+    return array;
+}
+
 const NodeObservable = (params: { nodes: string[], count: number, timeout?: number, concurrency?: number, api: IAPIDependency }) =>
-    Observable.from(params.nodes)
+    Observable.from(shuffle(params.nodes.slice()))
         .distinct()
         .flatMap(l => {
             const client = params.api({ apiHost: l });
diff --git a/src/app/modules/sections/epics/renderPageEpic.ts b/src/app/modules/sections/epics/renderPageEpic.ts
index 7e1922d9b..2f018d2df 100644
--- a/src/app/modules/sections/epics/renderPageEpic.ts
+++ b/src/app/modules/sections/epics/renderPageEpic.ts
@@ -23,6 +23,12 @@
 import { Epic } from 'modules';
 import { Observable } from 'rxjs/Observable';
 import { renderPage } from '../actions';
+import NodeObservable from 'modules/engine/util/NodeObservable';
+import keyring from 'lib/keyring';
+
+const invalidationError = {
+    error: 'E_INVALIDATED'
+};
 
 const renderPageEpic: Epic = (action$, store, { api }) => action$.ofAction(renderPage.started)
     .flatMap(action => {
@@ -45,27 +51,62 @@ const renderPageEpic: Epic = (action$, store, { api }) => action$.ofAction(rende
                 locale: state.storage.locale
             }) : Promise.resolve(null)
 
-        ])).map(payload => {
+        ])).flatMap(payload => {
             const page = payload[0];
             const defaultPage = payload[1];
 
-            return renderPage.done({
-                params: action.payload,
-                result: {
-                    defaultMenu: defaultPage && defaultPage.menu !== page.menu && {
-                        name: defaultPage.menu,
-                        content: defaultPage.menutree
-                    },
-                    menu: {
-                        name: page.menu,
-                        content: page.menutree
-                    },
-                    page: {
-                        params: action.payload.params,
+            return NodeObservable({
+                nodes: state.storage.fullNodes,
+                count: Math.min(state.storage.fullNodes.length, 3),
+                api
+            }).flatMap(node => client.to(node).pageValidatorsCount({
+                name: action.payload.name
+
+            })).map(v => v.validate_count).max().defaultIfEmpty(0).flatMap(count => {
+                return NodeObservable({
+                    nodes: state.storage.fullNodes,
+                    count,
+                    concurrency: 3,
+                    api
+
+                }).flatMap(apiHost => Observable.from(
+                    api({ apiHost }).contentHash({
                         name: action.payload.name,
-                        content: page.tree
+                        ecosystem: state.auth.wallet.access.ecosystem,
+                        walletID: state.auth.wallet.wallet.id,
+                        role: state.auth.wallet.role ? Number(state.auth.wallet.role.id) : null,
+                        locale: state.storage.locale,
+                        params: action.payload.params
+
+                    })
+                )).catch(e => Observable.empty<never>()).toArray().map(result => {
+                    const contentHash = keyring.hashData(page.plainText.trim());
+
+                    for (let i = 0; i < result.length; i++) {
+                        if (contentHash !== result[i].hash) {
+                            throw invalidationError;
+                        }
                     }
-                }
+
+                    return renderPage.done({
+                        params: action.payload,
+                        result: {
+                            defaultMenu: defaultPage && defaultPage.menu !== page.menu && {
+                                name: defaultPage.menu,
+                                content: defaultPage.menutree
+                            },
+                            menu: {
+                                name: page.menu,
+                                content: page.menutree
+                            },
+                            page: {
+                                params: action.payload.params,
+                                name: action.payload.name,
+                                content: page.tree
+                            }
+                        }
+                    });
+                });
             });
 
         }).catch(e =>
diff --git a/src/defs/api.d.ts b/src/defs/api.d.ts
index f490d02ba..84b3bea9a 100644
--- a/src/defs/api.d.ts
+++ b/src/defs/api.d.ts
@@ -201,7 +201,6 @@ declare module 'genesis/api' {
         tree: TProtypoElement[];
         menutree?: TProtypoElement[];
         plainText: string;
-        nodesCount: number;
     }
 
     interface IContentTestRequest {
@@ -237,6 +236,14 @@ declare module 'genesis/api' {
         hash: string;
     }
 
+    interface IPageValidatorsRequest {
+        name: string
+    }
+
+    interface IPageValidatorsResponse {
+        validate_count: number
+    }
+
     interface ISegmentRequest {
         offset?: number;
         limit?: number;