diff --git a/contracts/gamma/GammaCards.v2.sol b/contracts/gamma/GammaCards.v2.sol
index 830fe48..e7b5bf0 100644
--- a/contracts/gamma/GammaCards.v2.sol
+++ b/contracts/gamma/GammaCards.v2.sol
@@ -47,6 +47,7 @@ contract NofGammaCardsV2 is ERC721, ERC721URIStorage, ERC721Burnable, Ownable {
     uint256 public secondaryAlbumPrize = 1e18; // 1 DAI por album secundario completado
     string public mainUri;
     string public secondaryUri;
+    bool public requireOpenPackSignerValidation;
     mapping (uint256 cardNumber => uint256 amount) public cardsInventory; // maximos: 119 => 4999
     mapping (uint256 tokenId => Card) public cards;
     mapping(address user => mapping(uint8 cardNumber => uint8 amount)) public cardsByUser;
@@ -69,6 +70,21 @@ contract NofGammaCardsV2 is ERC721, ERC721URIStorage, ERC721Burnable, Ownable {
     event NewSigner(address newSigner);
     event NewUris(string newMainUri, string newSecondaryUri);
 
+    constructor(address _daiTokenAddress, address _packsContract, string memory _baseUri, address _signer) 
+        ERC721("GammaCards", "NOF_GC") {
+        packsContract = IGammaPacks(_packsContract);
+        DAI_TOKEN = _daiTokenAddress;
+        baseUri = _baseUri;
+        mainUri = string(abi.encodePacked(bytes(baseUri), bytes("/"), bytes("120"), bytes("F.json")));
+        secondaryUri = string(abi.encodePacked(bytes(baseUri), bytes("/"), bytes("121"), bytes("F.json")));
+        signers[_signer] = true;
+        requireOpenPackSignerValidation = false;
+        for(uint256 i;i<122;i++){
+            cardsInventory[i] = 1;
+        }
+        owners[msg.sender] = true;
+    }
+
     modifier onlyPacksContract {
         require(msg.sender == address(packsContract), "Solo contrato de packs");
         _;
@@ -105,40 +121,39 @@ contract NofGammaCardsV2 is ERC721, ERC721URIStorage, ERC721Burnable, Ownable {
         signers[_signerToRemove] = false;
     }
 
-    constructor(address _daiTokenAddress, address _packsContract, string memory _baseUri, address _signer) 
-        ERC721("GammaCards", "NOF_GC") {
-        packsContract = IGammaPacks(_packsContract);
-        DAI_TOKEN = _daiTokenAddress;
-        baseUri = _baseUri;
-        mainUri = string(abi.encodePacked(bytes(baseUri), bytes("/"), bytes("120"), bytes("F.json")));
-        secondaryUri = string(abi.encodePacked(bytes(baseUri), bytes("/"), bytes("121"), bytes("F.json")));
-        signers[_signer] = true;
-        for(uint256 i;i<122;i++){
-            cardsInventory[i] = 1;
-        }
-        owners[msg.sender] = true;
+    function changeRequireOpenPackSignerValidation(bool required) external onlyOwners {
+        requireOpenPackSignerValidation = required;
+    }
+
+    function verifyPackSigner(uint256 packNumber, uint8[] memory packData, bytes calldata signature) public view 
+        returns (address signer) {
+        bytes32 messageHash = keccak256(abi.encodePacked(msg.sender, packNumber, 
+            packData, '0xf1dD71895e49b1563693969de50898197cDF3481')).toEthSignedMessageHash();
+        address recoveredSigner = messageHash.recover(signature);
+        console.log('open pack signer recovered', recoveredSigner);
+        return recoveredSigner;
     }
 
     function openPack(uint256 packNumber, uint8[] memory packData, bytes calldata signature) external {
         require(packsContract.getPackOwner(packNumber) == msg.sender, "Este sobre no es tuyo");
         require(packData.length < 15, "Limite de cartas excedido"); // chequear este length
         
-        packsContract.openPack(packNumber, msg.sender);
-        prizesBalance += packPrice - packPrice / 6;
-
-        // Recreates the message present in the `signature`
-        bytes32 messageHash = 
-            keccak256(abi.encodePacked(
-                msg.sender, packNumber, 
+        if (requireOpenPackSignerValidation) {
+            // Recreates the message present in the `signature`
+            bytes32 messageHash = keccak256(abi.encodePacked(msg.sender, packNumber, 
                 packData, '0xf1dD71895e49b1563693969de50898197cDF3481')).toEthSignedMessageHash();
 
-        address recoveredSigner = messageHash.recover(signature);
-        console.log('open pack signer recovered', recoveredSigner);
-        require(signers[recoveredSigner], "Invalid signature");
+            address recoveredSigner = messageHash.recover(signature);
+            console.log('open pack signer recovered', recoveredSigner);
+            require(signers[recoveredSigner], "Invalid signature");
+        }
 
+        packsContract.openPack(packNumber, msg.sender);
+        prizesBalance += packPrice - packPrice / 6;
         uint256 length = packData.length;
         for(uint8 i;i<length;i++){
-            require(packData[i] == 120 ? cardsInventory[120] < 3001 : cardsInventory[packData[i]] < 5001);
+            require(packData[i] == 120 ? cardsInventory[120] < 3001 : cardsInventory[packData[i]] < 5001, 
+                'invalid cardInventory position');
             cardsInventory[packData[i]]++; // 280k gas aprox.
             cardsByUser[msg.sender][packData[i]]++; // 310k gas aprox.
         }
diff --git a/scripts/common.ts b/scripts/common.ts
index cda020e..b0af169 100644
--- a/scripts/common.ts
+++ b/scripts/common.ts
@@ -5,8 +5,8 @@ import { SignerWithAddress } from '@nomiclabs/hardhat-ethers/signers';
 import Web3 from 'web3';
 import { config } from 'hardhat';
 
-const isLocalhost = (network.name === 'localhost') || (network.name === '127.0.0.1')
-const isHardhat = (network.name === 'hardhat') 
+export const isLocalhost = (network.name === 'localhost') || (network.name === '127.0.0.1')
+export const isHardhat = (network.name === 'hardhat') 
 
 export async function getInitData() {
   if (isHardhat) {
@@ -43,7 +43,9 @@ export async function deployContracts(addresses: SignerWithAddress[]) {
   const additionalOwners = (process.env.ADDITIONAL_OWNERS_WALLETS_ADDRESSES 
       || '0x35dad65F60c1A32c9895BE97f6bcE57D32792E83,0x8a8F5e5ae88532c605921f320a92562c9599fB9E').split(',')
   const balanceReceiverAddress = 
-    (isLocalhost || isHardhat) ? addresses[0].address : (process.env.BALANCE_RECEIVER_WALLET_ADDRESS || '0x6b510284C49705eA14e92aD35D86FD3075eC56e0')
+    (isLocalhost || isHardhat) 
+      ? addresses[0].address 
+      : (process.env.BALANCE_RECEIVER_WALLET_ADDRESS || '0x6b510284C49705eA14e92aD35D86FD3075eC56e0')
 
   console.log(`deploying contract ${nofDaiContractName}`)
   const TestDAI = await ethers.getContractFactory(nofDaiContractName);
@@ -52,7 +54,7 @@ export async function deployContracts(addresses: SignerWithAddress[]) {
 
   console.log(`deploying contract ${nofAlphaContractName}`)
   const Alpha = await ethers.getContractFactory(nofAlphaContractName);
-  const alpha = await Alpha.deploy('https://nof.town', testDAI.address, balanceReceiverAddress);
+  const alpha = await Alpha.deploy('https://storage.googleapis.com/nof-alfa/T1', testDAI.address, balanceReceiverAddress);
   await alpha.deployed();
 
   console.log(`deploying contract ${nofGammaPacksContractName}`)
@@ -62,7 +64,8 @@ export async function deployContracts(addresses: SignerWithAddress[]) {
 
   console.log(`deploying contract ${nofGammaCardsContractName}`)
   const GammaCards = await ethers.getContractFactory(nofGammaCardsContractName);
-  const gammaCards = await GammaCards.deploy(testDAI.address, gammaPacks.address, 'https://storage.googleapis.com/nof-gamma/T1', microServiceSignatureWalletsAddresses[0]);
+  const gammaCards = await GammaCards.deploy(testDAI.address, gammaPacks.address, 
+    'https://storage.googleapis.com/nof-gamma/T1', microServiceSignatureWalletsAddresses[0]);
   await gammaCards.deployed();
   await gammaPacks.setCardsContract(gammaCards.address);
 
diff --git a/scripts/deploy-mock-data.ts b/scripts/deploy-mock-data.ts
index dd2ff3f..f260b89 100644
--- a/scripts/deploy-mock-data.ts
+++ b/scripts/deploy-mock-data.ts
@@ -2,7 +2,7 @@ import "@nomiclabs/hardhat-ethers";
 import { ethers } from "hardhat"; 
 import { SignerWithAddress } from "@nomiclabs/hardhat-ethers/signers";
 import { Contract } from "ethers";
-import { generateSignature, getInitData, deployContracts } from "./common";
+import { generateSignature, getInitData, deployContracts, isHardhat, isLocalhost } from "./common";
 
 async function createAlphaMockData( addresses: SignerWithAddress[], testDAI: Contract, alpha: Contract ) {
   // Alpha Data
@@ -61,66 +61,62 @@ async function createGammaMockData(
   const allowance = await testDAI.allowance(addresses[0].address, gammaPacks.address)
   console.log(`${addresses[0].address} allowance to use with $ gamaPackAddress (${gammaPacks.address}): `, allowance)
 
-  console.log('buying Pack...')
-  const estimatedGas = await gammaPacks.estimateGas.buyPack();
-  console.log('buying Pack, estimated gas', estimatedGas)
-
-  const gasLimit = estimatedGas.add(10000) // security-margin
-  const tokenId = await gammaPacks.buyPack({ gasLimit, from: addresses[0].address });
-  console.log('Buyed Pack token Id', tokenId.value)
-
-  console.log('Verifing testDai balance...')
-  const balance2 = await testDAI.balanceOf(addresses[0].address)
-  console.log(`${addresses[0].address} balance: `, balance2)
-
-  console.log('Verifing testDai allowance...')
-  const allowance2 = await testDAI.allowance(addresses[0].address, gammaPacks.address)
-  console.log(`${addresses[0].address} allowance to use with $ gamaPackAddress (${gammaPacks.address}): `, allowance2)
-
-  console.log('Verifing pack owner...')
-  const packOwner = await gammaPacks.getPackOwner(tokenId.value)
-  console.log(`Owner of TokenId ${tokenId.value}: ${packOwner}`)
-
-  console.log('buying 3 Packs...')
-  const estimatedGasTenPacks = await gammaPacks.estimateGas.buyPacks(3);
-  console.log('buying 3 Packs, estimated gas', estimatedGasTenPacks)
-
-  const gasLimitTenPacks = estimatedGasTenPacks.add(10000) // security-margin
-  await gammaPacks.buyPacks(3, { gasLimit: gasLimitTenPacks, from: addresses[0].address });
-
-  console.log('Verifing user\'s packs...')
-  const packs:[any] = await gammaPacks.getPacksByUser(addresses[0].address)
+  if (isHardhat || isLocalhost) {
+    console.log('buying Pack (estimating gas)...')
+    const estimatedGas = await gammaPacks.estimateGas.buyPack({ from: addresses[0].address });
+    console.log('buying Pack, estimated gas', estimatedGas)
+  
+    const gasLimit = estimatedGas.add(20000) // security-margin
+    console.log('buying Pack (real operation)...')
+    const tokenId = await gammaPacks.connect(addresses[0]).buyPack({ gasLimit });
+    console.log('Buyed Pack token Id', tokenId.value)
+  
+    console.log('Verifing testDai balance...')
+    const balance2 = await testDAI.balanceOf(addresses[0].address)
+    console.log(`${addresses[0].address} balance: `, balance2)
+  
+    console.log('Verifing testDai allowance...')
+    const allowance2 = await testDAI.allowance(addresses[0].address, gammaPacks.address)
+    console.log(`${addresses[0].address} allowance to use with $ gamaPackAddress (${gammaPacks.address}): `, allowance2)
+  
+    console.log('Verifing pack owner...')
+    const packOwner = await gammaPacks.getPackOwner(tokenId.value)
+    console.log(`Owner of TokenId ${tokenId.value}: ${packOwner}`)
+  
+    console.log('buying 2 Packs (estimating gas)...')
+    const estimatedGasTenPacks = await gammaPacks.estimateGas.buyPacks(2);
+    console.log('buying 2 Packs, estimated gas', estimatedGasTenPacks)
+  
+    console.log('buying 2 Packs (operation)...')
+    const gasLimitTenPacks = estimatedGasTenPacks.add(20000) // security-margin
+    await gammaPacks.connect(addresses[0]).buyPacks(2, { gasLimit: gasLimitTenPacks });
+  
+    console.log('Verifing user\'s packs...')
+    const packs:[any] = await gammaPacks.getPacksByUser(addresses[0].address)
+  
+    console.log('User\'s packs')
+    for (let i = 0; i < packs.length-1; i++) {
+      console.log(`\tPack ${i+1} Id: ${packs[i]}`)
+    }
 
-  console.log('User\'s packs')
-  for (let i = 0; i < packs.length-1; i++) {
-    console.log(`\tPack ${i+1} Id: ${packs[i]}`)
-  }
+    /*
+    //
+    TO-FIX: reason: 'invalid arrayify value',
+    //
+    console.log('Opening Pack with cardData simulating backend signature...')
+    const packNumber = ethers.BigNumber.from(packs[0]).toNumber()
+    const signatureData: any = await generateSignature(signatureMethod, addresses[0].address, packNumber)
+    const { packet_data, signature } = signatureData
 
-  /*
-  console.log('Opening Pack with cardData simulating backend signature...')
-  if (signatureMethod === '1') {
-    // tiene que cambiar la wallet del signer a la misma que hace la 
-    // firma en el método generateSignature1  (la wallet 0 de hardhat). 
-    // Se hace eso para que luego en el SC, al comparar ambas wallets, 
-    // funciones bien (wallet de firma = signer)
-    gammaCards.setSigner(addresses[0].address)
-
-    // en el caso de deploy fuera de local, el SC tiene que tener como signer
-    // la dirección de la clave privada que usa el micro-servicio:
-    // 0x20517cf8c140f7f393f92cea6158f57385a75733 
+    await gammaCards.openPack(packNumber, packet_data, signature)
+    
+    console.log('User\'s packs')
+    for (let i = 0; i < packs.length-1; i++) {
+      console.log(`\tPack ${i+1} Id: ${packs[i]}`)
+    }
+    */
   }
 
-  const signatureData: any = await generateSignature(signatureMethod, addresses[0].address, 0)
-  const packNumber = ethers.BigNumber.from(packs[0]).toNumber()
-  const { packet_data, signature } = signatureData
-
-  await gammaCards.openPack(packNumber, packet_data, signature)
-  */
-  
-  console.log('User\'s packs')
-  for (let i = 0; i < packs.length-1; i++) {
-    console.log(`\tPack ${i+1} Id: ${packs[i]}`)
-  }
 }
 
 async function main() {
diff --git a/test/gamma.test.ts b/test/gamma.test.ts
index fe0816f..0611680 100644
--- a/test/gamma.test.ts
+++ b/test/gamma.test.ts
@@ -70,7 +70,7 @@ describe('NoF - Gamma Tests', function () {
     expect(packOwner).to.equal(address0.address)
   })
 
-  it("Pack could be open by its owner", async () => {
+  it('Pack could be open by its owner', async () => {
     const { testDAI, gammaPacks, gammaCards, address0 } = await loadFixture(deployNofFixture)
     const TenPacksPrice = ethers.BigNumber.from('10000000000000000000'.toString())
     await testDAI._mint(address0.address, TenPacksPrice)