diff --git a/README.md b/README.md
index 2f6f855..35444aa 100644
--- a/README.md
+++ b/README.md
@@ -29,4 +29,55 @@ Separation of contract logic and data is extremely important in the case of vers
 
 * Run normal tests with `clarinet test`
 
-* Run chainhook tests with `clarinet test --chainhooks ./chainhooks/marketplace.chainhook.yaml ./tests_chainhook/integration_test.ts`
\ No newline at end of file
+* Run chainhook tests with `clarinet test --chainhooks ./chainhooks/marketplace.chainhook.yaml ./tests_chainhook/integration_test.ts`
+
+## How to run the POC
+
+* Run 
+
+```
+> cd infrastructure && docker-compose up
+```
+
+This will create the infrastructure (RabbitMq, Prometheus, Grafana, Postgresql)
+
+* Start up the consumer
+
+```
+> cd chainhook-consumer && yarn start:dev
+```
+
+Make sure to install dependencies first of course
+
+* Start up the subscriber
+
+```
+> cd chainhook-subscriber && yarn start:dev
+```
+
+Make sure that you installed the dependencies first, and that you've run the migrations 
+
+```
+> yarn migration:run
+```
+
+You can also drop the migrations: 
+
+```
+> yarn schema:drop
+```
+
+* Run the integration test and then have a look at `http://localhost:3003/api/v1/auctionhistory/0`
+
+You should be getting the history of the auction entity you just inserted
+
+```
+[
+   "Auction with the id \"0\" was created at 7/28/2023, 3:46:30 PM. The id was changed to \"10b289cf-1684-4544-b1e0-f2c3b4548b87\". The createdAt was changed to \"2023-07-28T12:46:30.742Z\". The updatedAt was changed to \"2023-07-28T09:46:30.706Z\". The hash was changed to \"5b13b317d797e65992c2064d058cc8ace0dbe490b3026b8a1a76073f02342aa1\". The auctionId was changed to \"0\". The endBlock was changed to \"1000\". The highestBid was changed to \"0\". The maker was changed to \"ST1SJ3DTE5DN7X54YDH5D64R3BCB6A2AG2ZQ8YPD5\". The nftAsset was changed to \"ST1PQHQKV0RJXZFY1DGX8MNSNYVE3VGZJSRTPGZGM.sip009-nft\". The highestBidder was changed to \"null\". The status was changed to \"OPEN\".",
+   "Auction bid with the amount \"1200.00\" and bidder \"ST2CY5V39NHDPWSXMW9QDT3HC3GD6Q6XX4CFRK9AG\" was created at 7/28/2023, 3:46:30 PM. The id was changed to \"997d1955-349e-4a00-bfb8-6d722d0b590d\". The createdAt was changed to \"2023-07-28T12:46:30.935Z\". The updatedAt was changed to \"2023-07-28T09:46:30.883Z\". The hash was changed to \"2ea36fd6353a3b87da323c95fa71ae881c830f7ac6529600242817f9894f9603\". The amount was changed to \"1200.00\". The bidder was changed to \"ST2CY5V39NHDPWSXMW9QDT3HC3GD6Q6XX4CFRK9AG\".",
+   "Auction with the id \"0\" was updated at 7/28/2023, 3:46:31 PM. The updatedAt was changed to \"2023-07-28T12:46:30.961Z\". The hash was changed to \"95f95053620e826235584568dfd452ea5af14a9fd5aec0cb6d26b697d27c2e4d\". The highestBid was changed to \"1200.00\". The highestBidder was changed to \"ST2CY5V39NHDPWSXMW9QDT3HC3GD6Q6XX4CFRK9AG\".",
+   "Auction bid with the amount \"5000.00\" and bidder \"ST2JHG361ZXG51QTKY2NQCVBPPRRE2KZB1HR05NNC\" was created at 7/28/2023, 3:46:31 PM. The id was changed to \"01ebce17-9dc9-4dbc-91e6-a4ad4d299711\". The createdAt was changed to \"2023-07-28T12:46:31.056Z\". The updatedAt was changed to \"2023-07-28T09:46:31.026Z\". The hash was changed to \"6a70cc66d818027a29dd5f5af4a12c225be09b6bb7d36dcb610e84194c938500\". The amount was changed to \"5000.00\". The bidder was changed to \"ST2JHG361ZXG51QTKY2NQCVBPPRRE2KZB1HR05NNC\".",
+   "Auction with the id \"0\" was updated at 7/28/2023, 3:46:31 PM. The updatedAt was changed to \"2023-07-28T12:46:31.076Z\". The hash was changed to \"2f25544ed3b1e3d32a593e8193be8526f87f0923ee748a535f605771f822b963\". The highestBid was changed to \"5000.00\". The highestBidder was changed to \"ST2JHG361ZXG51QTKY2NQCVBPPRRE2KZB1HR05NNC\".",
+   "Auction with the id \"0\" was updated at 7/28/2023, 3:46:31 PM. The updatedAt was changed to \"2023-07-28T12:46:31.225Z\". The hash was changed to \"1bc7cc24cc3bd580a457e26a8cb12a1738b906f1b9f1e43c99f18d6f76931006\". The status was changed to \"CANCELLED\"."
+]
+```
\ No newline at end of file
diff --git a/chainhook-subscriber/src/common/decorators/track-changes.decorator.ts b/chainhook-subscriber/src/common/decorators/track-changes.decorator.ts
new file mode 100644
index 0000000..0c64b2a
--- /dev/null
+++ b/chainhook-subscriber/src/common/decorators/track-changes.decorator.ts
@@ -0,0 +1,15 @@
+import "reflect-metadata";
+
+export const METADATA_KEY = Symbol('TrackChanges');
+
+export function TrackChanges(): PropertyDecorator {
+    return function (target: Object, propertyKey: string | symbol): void {
+      let existingProperties: Array<string | symbol> = Reflect.getMetadata(METADATA_KEY, target.constructor);
+      if (existingProperties) {
+        existingProperties.push(propertyKey);
+      } else {
+        existingProperties = [propertyKey];
+        Reflect.defineMetadata(METADATA_KEY, existingProperties, target.constructor);
+      }
+    };
+  }
diff --git a/chainhook-subscriber/src/common/entity/custom-base.entity.ts b/chainhook-subscriber/src/common/entity/custom-base.entity.ts
index b00b7bb..685880e 100644
--- a/chainhook-subscriber/src/common/entity/custom-base.entity.ts
+++ b/chainhook-subscriber/src/common/entity/custom-base.entity.ts
@@ -7,20 +7,28 @@ import {
   PrimaryGeneratedColumn,
   UpdateDateColumn,
 } from 'typeorm';
+import { TrackChanges } from '../decorators/track-changes.decorator';
 
 /**
  * custom base entity
  */
 export abstract class CustomBaseEntity extends BaseEntity {
   @PrimaryGeneratedColumn('uuid')
+  @TrackChanges()
   id: string;
 
   @Column({ type: 'timestamp', precision: 3, default: () => 'CURRENT_TIMESTAMP(3)' })
+  @TrackChanges()
   createdAt: Date;
 
   @Column({ type: 'timestamp', precision: 3, default: () => 'CURRENT_TIMESTAMP(3)' })
+  @TrackChanges()
   updatedAt: Date;
 
+  @Column({ type: 'char', length: 64 })
+  @TrackChanges()
+  hash: string;
+
   @BeforeInsert()
   createTimestamp() {
     this.createdAt = new Date();
diff --git a/chainhook-subscriber/src/database/migrations/1690548214447-Hash.ts b/chainhook-subscriber/src/database/migrations/1690548214447-Hash.ts
new file mode 100644
index 0000000..9c27a49
--- /dev/null
+++ b/chainhook-subscriber/src/database/migrations/1690548214447-Hash.ts
@@ -0,0 +1,20 @@
+import {MigrationInterface, QueryRunner} from "typeorm";
+
+export class Hash1690548214447 implements MigrationInterface {
+    name = 'Hash1690548214447'
+
+    public async up(queryRunner: QueryRunner): Promise<void> {
+        await queryRunner.query(`ALTER TABLE "Auctions" ADD "hash" character(64) NOT NULL`);
+        await queryRunner.query(`ALTER TABLE "Bids" ADD "hash" character(64) NOT NULL`);
+        await queryRunner.query(`ALTER TABLE "auction_bids_history" ADD "hash" character(64) NOT NULL`);
+        await queryRunner.query(`ALTER TABLE "auctions_history" ADD "hash" character(64) NOT NULL`);
+    }
+
+    public async down(queryRunner: QueryRunner): Promise<void> {
+        await queryRunner.query(`ALTER TABLE "auctions_history" DROP COLUMN "hash"`);
+        await queryRunner.query(`ALTER TABLE "auction_bids_history" DROP COLUMN "hash"`);
+        await queryRunner.query(`ALTER TABLE "Bids" DROP COLUMN "hash"`);
+        await queryRunner.query(`ALTER TABLE "Auctions" DROP COLUMN "hash"`);
+    }
+
+}
diff --git a/chainhook-subscriber/src/modules/auctionhistory/services/base.service.ts b/chainhook-subscriber/src/modules/auctionhistory/services/base.service.ts
index 599ac01..bccf212 100644
--- a/chainhook-subscriber/src/modules/auctionhistory/services/base.service.ts
+++ b/chainhook-subscriber/src/modules/auctionhistory/services/base.service.ts
@@ -1,10 +1,11 @@
-import { BaseSimpleRepository } from "src/common/repository/base.simple.repository";
+import { createHash } from "crypto";
+import { METADATA_KEY } from "src/common/decorators/track-changes.decorator";
 import { runOnTransactionCommit, runOnTransactionComplete, runOnTransactionRollback } from "src/common/transaction/hook";
 import { BaseHistory } from "src/modules/history/entities/base.history.entity";
 
 import * as winston from 'winston';
 
-export abstract class BaseService<T extends { id: string }, H extends BaseHistory> {
+export abstract class BaseService {
     protected readonly Logger = winston.createLogger({
         level: 'info',
         format: winston.format.combine(winston.format.timestamp(), winston.format.json()),
@@ -15,30 +16,29 @@ export abstract class BaseService<T extends { id: string }, H extends BaseHistor
     });
 
     protected constructor(
-        protected entity: new () => T,
-        protected history: new () => H,
-        protected readonly HRepository: BaseSimpleRepository<H>,
+        
     ) {
     }
 
     protected setupTransactionHooks() {
         runOnTransactionRollback((cb) =>
-            this.Logger.info(`[ROLLBACK] Error: ${cb.message}`),
+            this.Logger.error(`[ROLLBACK] Error: ${cb.message}`),
         );
 
-
         runOnTransactionComplete((_) => this.Logger.info('[COMMIT] Transaction Complete'));
         runOnTransactionCommit(() => this.Logger.info('[COMMIT] Transaction Commit'));
     }
 
-    protected async insertIntoHistory(oldEntity: T, newEntity: T, action: H['action'], 
+    protected async insertIntoHistory<T extends { id: string }, H extends BaseHistory>(
+        historyFunc: new () => H,
+        oldEntity: T, newEntity: T, action: H['action'], 
         copyEntityToHistory: (entity: T, history: H) => void, 
         save: (history: H) => Promise<H>) {
         this.Logger.info('Inside insertIntoHistory');
         
         const entity = newEntity;
 
-        const history = new this.history();
+        const history = new historyFunc();
         history.action = action;
         history.createdAt = new Date();
 
@@ -51,38 +51,65 @@ export abstract class BaseService<T extends { id: string }, H extends BaseHistor
         copyEntityToHistory(entity, history);
 
         this.Logger.info('Inside insertIntoHistory - awaiting save');
+        console.log(this.stringify(history));
 
-        const cache = new Set();
-        const replacer = (key, value) => {
-        if (typeof value === 'object' && value !== null) {
-            if (cache.has(value)) {
-            // Duplicate reference found, discard key
-            return;
+        await save(history);
+    }
+
+    protected calculateHash(entity: any): string {
+        const properties: Array<string | symbol> = Reflect.getMetadata(METADATA_KEY, entity.constructor) || [];
+    
+        const obj: { [key: string]: any } = {};
+    
+        for (const key of properties) {
+            if (entity.hasOwnProperty(key)) {
+                obj[String(key)] = entity[key];
             }
-            // Store value in our set
-            cache.add(value);
         }
-        return value;
-        };  
-
-        console.log(JSON.stringify(history, replacer, 2));
-
-        await save(history);
+    
+        const str = this.stringify(obj);
+        const hash = createHash('sha256');
+        hash.update(str);
+        return hash.digest('hex');
     }
 
-    buildChanges(oldEntity: T, newEntity: T): Array<{ name: string, old_value: any, new_value: any }> {
+    private buildChanges<T extends { id: string }>(oldEntity: T, newEntity: T): Array<{ name: string, old_value: any, new_value: any }> {
         const changes = [];
     
-        for (const key in newEntity) {
-          if (!oldEntity || newEntity[key] !== oldEntity[key]) {
-            changes.push({
-              name: key,
-              old_value: oldEntity ? oldEntity[key] : null,
-              new_value: newEntity[key],
-            });
-          }
+        const decoratedProperties: Array<string | symbol> = Reflect.getMetadata(METADATA_KEY, newEntity.constructor);
+
+        for (const key of decoratedProperties) {
+            // Skip if the property is not a direct property of newEntity
+            if (!newEntity.hasOwnProperty(key)) {
+                continue;
+            }
+
+            if (!oldEntity || newEntity[key] !== oldEntity[key]) {
+                changes.push({
+                    name: key,
+                    old_value: oldEntity ? oldEntity[key] : null,
+                    new_value: newEntity[key],
+                });
+            }
         }
     
         return changes;
     }
+
+    private stringify(obj: any): string {
+        const cache = new Set();
+        const replacer = (key, value) => {
+            if (typeof value === 'object' && value !== null) {
+                if (cache.has(value)) {
+                // Duplicate reference found, discard key
+                return;
+                }
+                // Store value in our set
+                cache.add(value);
+            }
+            return value;
+        };  
+
+        return JSON.stringify(obj, replacer, 2);
+    }
 }
\ No newline at end of file
diff --git a/chainhook-subscriber/src/modules/auctionhistory/services/cancel.auction.service.ts b/chainhook-subscriber/src/modules/auctionhistory/services/cancel.auction.service.ts
index 71970a0..bb924dc 100644
--- a/chainhook-subscriber/src/modules/auctionhistory/services/cancel.auction.service.ts
+++ b/chainhook-subscriber/src/modules/auctionhistory/services/cancel.auction.service.ts
@@ -13,14 +13,14 @@ import { AuctionHistoryEntityRepositoryToken } from "../providers/auction.histor
 import { AuctionHistoryEntityRepository } from "../repositories/auction.history.repository";
 
 @Injectable()
-export class CancelAuctionService extends BaseService<AuctionEntity, AuctionHistoryEntity> {
+export class CancelAuctionService extends BaseService {
   constructor(
     @Inject(AuctionEntityRepositoryToken)
     private auctionRepository: AuctionEntityRepository,
     @Inject(AuctionHistoryEntityRepositoryToken)
     private auctionHistoryRepository: AuctionHistoryEntityRepository,
   ) {
-    super(AuctionEntity, AuctionHistoryEntity, auctionHistoryRepository);
+    super();
   }
 
   @Transactional({
@@ -37,15 +37,21 @@ export class CancelAuctionService extends BaseService<AuctionEntity, AuctionHist
         relations: ['bids'],
     });
 
+    if (auction != null && auction.status == AuctionStatus.CANCELLED) {
+      this.Logger.info('Auction already cancelled');  
+      return;
+    }
+
     const oldAuction = Object.assign(Object.create(Object.getPrototypeOf(auction)), auction) as AuctionEntity;
 
     auction.status = AuctionStatus.CANCELLED;
+    auction.hash = this.calculateHash(auction);
 
     await this.auctionRepository.save(auction);
 
     this.Logger.info('Auction Saved');
 
-    await this.insertIntoHistory(oldAuction, auction, "update", (entity: AuctionEntity, history: AuctionHistoryEntity) => {
+    await this.insertIntoHistory(AuctionHistoryEntity, oldAuction, auction, "update", (entity: AuctionEntity, history: AuctionHistoryEntity) => {
       history.auctionId = entity.auctionId;
       history.endBlock = entity.endBlock;
       history.createdAt = new Date();
@@ -56,6 +62,7 @@ export class CancelAuctionService extends BaseService<AuctionEntity, AuctionHist
       history.highestBidder = entity.highestBidder;
       history.nftAsset = entity.nftAsset;
       history.status = entity.status;
+      history.hash = entity.hash;
     }, (entity: AuctionHistoryEntity) => this.auctionHistoryRepository.save(entity));
   }
 }
\ No newline at end of file
diff --git a/chainhook-subscriber/src/modules/auctionhistory/services/place.bid.service.ts b/chainhook-subscriber/src/modules/auctionhistory/services/place.bid.service.ts
index e7ef045..c3e0844 100644
--- a/chainhook-subscriber/src/modules/auctionhistory/services/place.bid.service.ts
+++ b/chainhook-subscriber/src/modules/auctionhistory/services/place.bid.service.ts
@@ -11,9 +11,13 @@ import { BaseService } from "./base.service";
 import { AuctionBidHistoryEntityRepositoryToken } from "../providers/auction.bid.history.repository.provider";
 import { AuctionBidHistoryEntityRepository } from "../repositories/auction.bid.history.repository";
 import { AuctionBidHistoryEntity } from "../entities/auction.bid.history.entity";
+import { AuctionEntity } from "src/modules/auctions/entities/auction.entity";
+import { AuctionHistoryEntity } from "../entities/auction.history.entity";
+import { AuctionHistoryEntityRepositoryToken } from "../providers/auction.history.repository.provider";
+import { AuctionHistoryEntityRepository } from "../repositories/auction.history.repository";
 
 @Injectable()
-export class PlaceBidService extends BaseService<AuctionBidEntity, AuctionBidHistoryEntity> {
+export class PlaceBidService extends BaseService {
   
   constructor(
     @Inject(AuctionEntityRepositoryToken)
@@ -22,8 +26,10 @@ export class PlaceBidService extends BaseService<AuctionBidEntity, AuctionBidHis
     private auctionBidRepository: AuctionBidEntityRepository,
     @Inject(AuctionBidHistoryEntityRepositoryToken)
     private auctionBidHistoryRepository: AuctionBidHistoryEntityRepository,
+    @Inject(AuctionHistoryEntityRepositoryToken)
+    private auctionHistoryRepository: AuctionHistoryEntityRepository,
   ) {
-    super(AuctionBidEntity, AuctionBidHistoryEntity, auctionBidHistoryRepository);
+    super();
   }
 
   @Transactional({
@@ -40,9 +46,18 @@ export class PlaceBidService extends BaseService<AuctionBidEntity, AuctionBidHis
         relations: ['bids'],
     });
 
+    const oldAuction = Object.assign(Object.create(Object.getPrototypeOf(auction)), auction) as AuctionEntity;
+
     const bid = new AuctionBidEntity();
     bid.amount = Number(placeBidModel.bid.value);
     bid.bidder = placeBidModel.bidder.value;
+    bid.hash = this.calculateHash(auction);
+
+    if (auction.bids.find(b => b.bidder === bid.bidder && b.amount == bid.amount)) {
+      // same bid, do nothing
+      this.Logger.info('Same bid, do nothing');
+      return;
+    }
 
     await this.auctionBidRepository.save(bid);
 
@@ -50,6 +65,7 @@ export class PlaceBidService extends BaseService<AuctionBidEntity, AuctionBidHis
 
     auction.highestBidder = bid.bidder;
     auction.highestBid = String(bid.amount);
+    auction.hash = this.calculateHash(auction);
 
     await this.auctionRepository.save(auction);
 
@@ -57,12 +73,27 @@ export class PlaceBidService extends BaseService<AuctionBidEntity, AuctionBidHis
 
     this.Logger.info('Inserting into history');
 
-    await this.insertIntoHistory(null, bid, "insert", (entity: AuctionBidEntity, history: AuctionBidHistoryEntity) => {
+    await this.insertIntoHistory(AuctionBidHistoryEntity, null, bid, "insert", (entity: AuctionBidEntity, history: AuctionBidHistoryEntity) => {
       history.auctionId = auction.auctionId;
       history.createdAt = new Date();
       history.bidder = entity.bidder;
       history.amount = entity.amount;
-    }, (entity: AuctionBidHistoryEntity) => this.HRepository.save(entity));
+      history.hash = entity.hash;
+    }, (entity: AuctionBidHistoryEntity) => this.auctionBidHistoryRepository.save(entity));
+
+    await this.insertIntoHistory(AuctionHistoryEntity, oldAuction, auction, "update", (entity: AuctionEntity, history: AuctionHistoryEntity) => {
+      history.auctionId = entity.auctionId;
+      history.endBlock = entity.endBlock;
+      history.createdAt = new Date();
+  
+      history.highestBid = entity.highestBid;
+      history.maker = entity.maker;
+  
+      history.highestBidder = entity.highestBidder;
+      history.nftAsset = entity.nftAsset;
+      history.status = entity.status;
+      history.hash = entity.hash;
+    }, (entity: AuctionHistoryEntity) => this.auctionHistoryRepository.save(entity));
 
     
     this.Logger.info('Inserted into history');
diff --git a/chainhook-subscriber/src/modules/auctionhistory/services/start.auction.service.ts b/chainhook-subscriber/src/modules/auctionhistory/services/start.auction.service.ts
index 71dbba8..a663649 100644
--- a/chainhook-subscriber/src/modules/auctionhistory/services/start.auction.service.ts
+++ b/chainhook-subscriber/src/modules/auctionhistory/services/start.auction.service.ts
@@ -12,7 +12,7 @@ import { AuctionHistoryEntityRepositoryToken } from "../providers/auction.histor
 import { AuctionHistoryEntityRepository } from "../repositories/auction.history.repository";
 
 @Injectable()
-export class StartAuctionService extends BaseService<AuctionEntity, AuctionHistoryEntity> {
+export class StartAuctionService extends BaseService {
   
   constructor(
     @Inject(AuctionEntityRepositoryToken)
@@ -21,7 +21,7 @@ export class StartAuctionService extends BaseService<AuctionEntity, AuctionHisto
     @Inject(AuctionHistoryEntityRepositoryToken)
     private auctionHistoryRepository: AuctionHistoryEntityRepository,
   ) {
-    super(AuctionEntity, AuctionHistoryEntity, auctionHistoryRepository);
+    super();
   }
 
   @Transactional({
@@ -36,6 +36,7 @@ export class StartAuctionService extends BaseService<AuctionEntity, AuctionHisto
     });
 
     if (existingAuction != null) {
+        this.Logger.info('Auction already exists');
         return;
     }
     
@@ -61,11 +62,13 @@ export class StartAuctionService extends BaseService<AuctionEntity, AuctionHisto
 
     auction.nftAsset = startAuctionModel["nft-asset-contract"].value;
 
+    auction.hash = this.calculateHash(auction);
+
     await this.auctionRepository.save(auction);
 
     this.Logger.info('Auction Saved');
 
-    await this.insertIntoHistory(null, auction, "insert", (entity: AuctionEntity, history: AuctionHistoryEntity) => {
+    await this.insertIntoHistory(AuctionHistoryEntity, null, auction, "insert", (entity: AuctionEntity, history: AuctionHistoryEntity) => {
       history.auctionId = entity.auctionId;
       history.endBlock = entity.endBlock;
       history.createdAt = new Date();
@@ -76,6 +79,7 @@ export class StartAuctionService extends BaseService<AuctionEntity, AuctionHisto
       history.highestBidder = entity.highestBidder;
       history.nftAsset = entity.nftAsset;
       history.status = entity.status;
+      history.hash = entity.hash;
     }, (entity: AuctionHistoryEntity) => this.auctionHistoryRepository.save(entity));
   }
 }
\ No newline at end of file
diff --git a/chainhook-subscriber/src/modules/auctions/entities/auction.bid.entity.ts b/chainhook-subscriber/src/modules/auctions/entities/auction.bid.entity.ts
index d1875ad..33aa6ad 100644
--- a/chainhook-subscriber/src/modules/auctions/entities/auction.bid.entity.ts
+++ b/chainhook-subscriber/src/modules/auctions/entities/auction.bid.entity.ts
@@ -3,6 +3,7 @@ import { CustomBaseEntity } from "src/common/entity/custom-base.entity";
 import { Column, Entity, ManyToOne } from "typeorm";
 import { AuctionEntity } from "./auction.entity";
 import { Exclude } from 'class-transformer';
+import { TrackChanges } from "src/common/decorators/track-changes.decorator";
 
 
 @Entity({ name: 'Bids' })
@@ -10,10 +11,12 @@ export class AuctionBidEntity extends CustomBaseEntity {
 
     @Column({ type: 'decimal', precision: 10, scale: 2, default: 0 })
     @Allow()
+    @TrackChanges()
     amount: number;
 
     @Column()
     @Allow()
+    @TrackChanges()
     bidder: string;
 
     @ManyToOne(() => AuctionEntity, auction => auction.bids, {
diff --git a/chainhook-subscriber/src/modules/auctions/entities/auction.entity.ts b/chainhook-subscriber/src/modules/auctions/entities/auction.entity.ts
index 7035955..af06248 100644
--- a/chainhook-subscriber/src/modules/auctions/entities/auction.entity.ts
+++ b/chainhook-subscriber/src/modules/auctions/entities/auction.entity.ts
@@ -8,35 +8,42 @@ import {
 } from 'typeorm';
 import { AuctionStatus } from './auction.status';
 import { AuctionBidEntity } from './auction.bid.entity';
+import { TrackChanges } from 'src/common/decorators/track-changes.decorator';
 
 @Entity({ name: 'Auctions' })
 export class AuctionEntity extends CustomBaseEntity {
   @Column()
   @Allow()
+  @TrackChanges()
   auctionId: number;
 
   @Column()
   @Allow()
+  @TrackChanges()
   endBlock: string;
 
   @Column({
     nullable: true,
   })
   @Allow()
+  @TrackChanges()
   highestBid: string;
 
   @Column()
   @Allow()
+  @TrackChanges()
   maker: string;
 
   @Column()
   @Allow()
+  @TrackChanges()
   nftAsset: string;
 
   @Column({
     nullable: true,
   })
   @Allow()
+  @TrackChanges()
   highestBidder: string;
 
   @Column({
@@ -44,6 +51,7 @@ export class AuctionEntity extends CustomBaseEntity {
       enum: AuctionStatus,
       default: AuctionStatus.OPEN
   })
+  @TrackChanges()
   status: AuctionStatus;
 
   @OneToMany(
diff --git a/chainhook-subscriber/src/modules/history/entities/base.history.entity.ts b/chainhook-subscriber/src/modules/history/entities/base.history.entity.ts
index 3896156..c0f01b2 100644
--- a/chainhook-subscriber/src/modules/history/entities/base.history.entity.ts
+++ b/chainhook-subscriber/src/modules/history/entities/base.history.entity.ts
@@ -24,6 +24,9 @@ import {
     @Column('json', { default: {} })
     changes: any;
 
+    @Column({ type: 'char', length: 64 })
+    hash: string;
+
     @BeforeInsert()
     createTimestamp() {
       this.createdAt = new Date();