diff --git a/src/models/entities/Participant.ts b/src/models/entities/Participant.ts
index b854160..89fe4c2 100644
--- a/src/models/entities/Participant.ts
+++ b/src/models/entities/Participant.ts
@@ -5,9 +5,11 @@ import {
   IsOptional,
   IsPhoneNumber,
 
+  IsPositive,
+
   IsString
 } from "class-validator";
-import { Column, Entity, PrimaryGeneratedColumn, TableInheritance } from "typeorm";
+import { BeforeInsert, BeforeUpdate, Column, Entity, PrimaryGeneratedColumn, TableInheritance } from "typeorm";
 import { config } from '../../config';
 import { ResponseParticipant } from '../responses/ResponseParticipant';
 import { Address } from "./Address";
@@ -83,6 +85,27 @@ export abstract class Participant {
   @IsString()
   created_via?: string;
 
+  @Column({ type: 'bigint', nullable: true, readonly: true })
+  @IsInt()
+  @IsPositive()
+  created_at: number;
+
+  @Column({ type: 'bigint', nullable: true })
+  @IsInt()
+  @IsPositive()
+  updated_at: number;
+
+  @BeforeInsert()
+  public setCreatedAt() {
+    this.created_at = Math.floor(Date.now() / 1000);
+    this.updated_at = Math.floor(Date.now() / 1000);
+  }
+
+  @BeforeUpdate()
+  public setUpdatedAt() {
+    this.updated_at = Math.floor(Date.now() / 1000);
+  }
+
   /**
    * Turns this entity into it's response class.
    */
diff --git a/src/models/responses/ResponseParticipant.ts b/src/models/responses/ResponseParticipant.ts
index 9171466..6418e42 100644
--- a/src/models/responses/ResponseParticipant.ts
+++ b/src/models/responses/ResponseParticipant.ts
@@ -1,4 +1,4 @@
-import { IsInt, IsObject, IsOptional, IsString } from "class-validator";
+import { IsInt, IsObject, IsOptional, IsPositive, IsString } from "class-validator";
 import { Address } from '../entities/Address';
 import { Participant } from '../entities/Participant';
 import { ResponseObjectType } from '../enums/ResponseObjectType';
@@ -63,6 +63,14 @@ export abstract class ResponseParticipant implements IResponse {
     @IsObject()
     address?: Address;
 
+    @IsInt()
+    @IsPositive()
+    created_at: number;
+
+    @IsInt()
+    @IsPositive()
+    updated_at: number;
+
     /**
      * Creates a ResponseParticipant object from a participant.
      * @param participant The participant the response shall be build for.
@@ -76,5 +84,7 @@ export abstract class ResponseParticipant implements IResponse {
         this.phone = participant.phone;
         this.email = participant.email;
         this.address = participant.address;
+        this.created_at = participant.created_at;
+        this.updated_at = participant.updated_at;
     }
 }