diff --git a/src/logic/trades/utils.ts b/src/logic/trades/utils.ts
index b2f8f6f..f4c550e 100644
--- a/src/logic/trades/utils.ts
+++ b/src/logic/trades/utils.ts
@@ -1,15 +1,5 @@
 /* eslint-disable @typescript-eslint/naming-convention */
-import {
-  Contract,
-  TypedDataField,
-  hexlify,
-  TypedDataDomain,
-  verifyTypedData,
-  toBeArray,
-  toUtf8Bytes,
-  zeroPadValue,
-  JsonRpcProvider
-} from 'ethers'
+import { Contract, TypedDataField, TypedDataDomain, verifyTypedData, toBeArray, zeroPadValue, JsonRpcProvider } from 'ethers'
 import { ChainId, ERC721TradeAsset, Network, TradeAsset, TradeAssetType, TradeCreation } from '@dcl/schemas'
 import { ContractData, ContractName, getContract } from 'decentraland-transactions'
 import { InvalidECDSASignatureError, MarketplaceContractNotFound } from '../../ports/trades/errors'
@@ -98,7 +88,8 @@ export function validateTradeSignature(trade: TradeCreation, signer: string): bo
       externalChecks: trade.checks.externalChecks?.map(externalCheck => ({
         contractAddress: externalCheck.contractAddress,
         selector: externalCheck.selector,
-        value: hexlify(toUtf8Bytes(externalCheck.value)),
+        // '0x' is the default value for the value bytes (0 bytes)
+        value: externalCheck.value ? externalCheck.value : '0x',
         required: externalCheck.required
       }))
     },
@@ -106,13 +97,15 @@ export function validateTradeSignature(trade: TradeCreation, signer: string): bo
       assetType: asset.assetType,
       contractAddress: asset.contractAddress,
       value: getValueFromTradeAsset(asset),
-      extra: hexlify(toUtf8Bytes(asset.extra))
+      // '0x' is the default value for extra bytes (0 bytes)
+      extra: asset.extra ? asset.extra : '0x'
     })),
     received: trade.received.map(asset => ({
       assetType: asset.assetType,
       contractAddress: asset.contractAddress,
       value: getValueFromTradeAsset(asset),
-      extra: hexlify(toUtf8Bytes(asset.extra)),
+      // '0x' is the default value for extra bytes (0 bytes)
+      extra: asset.extra ? asset.extra : '0x',
       beneficiary: asset.beneficiary
     }))
   }
diff --git a/test/unit/trades-component.spec.ts b/test/unit/trades-component.spec.ts
index ab4181c..3be1a8d 100644
--- a/test/unit/trades-component.spec.ts
+++ b/test/unit/trades-component.spec.ts
@@ -70,7 +70,7 @@ describe('when adding a new trade', () => {
           assetType: TradeAssetType.ERC20,
           contractAddress: '0xabcdef',
           amount: '2',
-          extra: ''
+          extra: '0x'
         }
       ],
       received: [
@@ -78,7 +78,7 @@ describe('when adding a new trade', () => {
           assetType: TradeAssetType.ERC721,
           contractAddress: '0x789abc',
           tokenId: '1',
-          extra: '',
+          extra: '0x',
           beneficiary: '0x9876543210'
         }
       ]
@@ -335,7 +335,7 @@ describe('when getting a trade', () => {
             assetType: TradeAssetType.ERC20,
             contractAddress: '0xabcdef',
             amount: '2',
-            extra: ''
+            extra: '0x'
           }
         ],
         received: [
@@ -343,7 +343,7 @@ describe('when getting a trade', () => {
             assetType: TradeAssetType.ERC721,
             contractAddress: '0x789abc',
             tokenId: '1',
-            extra: '',
+            extra: '0x',
             beneficiary: '0x9876543210'
           }
         ]
diff --git a/test/unit/trades-logic.spec.ts b/test/unit/trades-logic.spec.ts
index dee6637..e73e760 100644
--- a/test/unit/trades-logic.spec.ts
+++ b/test/unit/trades-logic.spec.ts
@@ -1,5 +1,5 @@
 /* eslint-disable @typescript-eslint/naming-convention */
-import { HDNodeWallet, TypedDataDomain, Wallet, zeroPadValue, toBeArray, hexlify, toUtf8Bytes } from 'ethers'
+import { HDNodeWallet, TypedDataDomain, Wallet, zeroPadValue, toBeArray } from 'ethers'
 import { ChainId, Network, TradeAssetType, TradeCreation, TradeType } from '@dcl/schemas'
 import { ContractData, ContractName, getContract } from 'decentraland-transactions'
 import { fromMillisecondsToSeconds } from '../../src/logic/date'
@@ -82,13 +82,13 @@ describe('when verifying the trade signature', () => {
         assetType: asset.assetType,
         contractAddress: asset.contractAddress,
         value: getValueFromTradeAsset(asset),
-        extra: hexlify(toUtf8Bytes(asset.extra))
+        extra: asset.extra
       })),
       received: trade.received.map(asset => ({
         assetType: asset.assetType,
         contractAddress: asset.contractAddress,
         value: getValueFromTradeAsset(asset),
-        extra: hexlify(toUtf8Bytes(asset.extra)),
+        extra: asset.extra,
         beneficiary: asset.beneficiary
       }))
     }