diff --git a/ETHPool.sol b/ETHPool.sol
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+++ b/ETHPool.sol
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+// SPDX-License-Identifier: GPL-3.0
+pragma solidity ^0.8.0;
+
+    ///@title ETHPool Challenge
+    ///@author Juan Pablo Poujade (jppoujade@gmail.com)
+    /**
+    @notice ETHPool provides a service where 
+    people can deposit ETH and they will receive weekly rewards
+    */   
+contract ETHPool {
+    
+    // Total rewards deposited by the team
+    uint256 public totalRewards;
+    // Total amount deposited by users
+    uint256 public totalUsersDeposits;
+
+    // Main users data:
+    struct userData {
+        uint256 depositedAmount;
+        uint256 rewardAmount;
+        bool isRegistered;
+    }
+    mapping(address => userData) public users;
+
+    // Whitepages for users participating in the protocol:
+    address[] usersAddressList;
+
+    // Mapping with information about the team's members addresses:
+    mapping(address => bool) public usersTeam;
+    
+    ///@dev Emitted when the team deposits rewards
+    ///@param from Address from which the rewards are sent
+    ///@param value ETH value deposited
+    ///@param date Date of the deposit
+    event rewardsDeposited(
+        address from,
+        uint256 value,
+        uint256 date
+    );
+
+    ///@dev Emitted when a user makes a new deposit
+    ///@param from The address of the user who made the deposit
+    ///@param value ETH value deposited by the user
+    ///@param date Date of the deposit
+    event userDeposited(
+        address from, 
+        uint256 value, 
+        uint256 date
+    );
+
+    ///@dev Emitted when a user makes a partial or full withdrawal of its current deposits
+    ///@param from The address of the user who made the withdrawal
+    ///@param value ETH value retired by the user
+    ///@param date Date of the withdrawal
+    event userWithdrawalDeposit(
+        address from, 
+        uint256 value, 
+        uint256 date
+    );
+
+    ///@dev Emitted when a user makes a partial or full withdrawal of its accumulated rewards
+    ///@param from The address of the user who made the withdrawal
+    ///@param value ETH value retired by the user
+    ///@param date Date of the withdrawal
+    event userWithdrawalRewards(
+        address from, 
+        uint256 value, 
+        uint256 date
+    );
+
+    // Modifier to ensure allowed operations
+    modifier onlyTeam() {
+        require(
+            usersTeam[msg.sender] == true,
+            "Only team members are allowed to execute this operation"
+        );
+        _;
+    }  
+
+    // Contract constructor:
+    constructor() {
+        usersTeam[msg.sender] = true;
+    }
+
+    // Function intendended for the users to make deposits into the protocol.
+    // The same user can make many different deposits along the time (will be accumulated)
+    function userDeposit() external payable {
+        // If this is a new user (first deposit), then we should add him to the registered/whitepages:
+        if (users[msg.sender].isRegistered == false) {
+            // Set flag as registered:
+            users[msg.sender].isRegistered = true;
+            // Add to whitepages:
+            usersAddressList.push(msg.sender);
+        }
+        // Update user total deposited amount:
+        users[msg.sender].depositedAmount += msg.value;
+        // Update total amount deposited by users:
+        totalUsersDeposits += msg.value;
+        // Trigger corresponding event:
+        emit userDeposited(msg.sender, msg.value, block.timestamp);
+    }
+
+
+    // Rewards deposits are expected to happen on weekly basis, but no restrictions were coded.
+    // In this way, additional unexpected rewards can be given by the team at any moment ;)
+    function depositRewards() external payable onlyTeam {
+        // If there are no deposits, it makes no sense to allow rewards to be deposited:
+        require(totalUsersDeposits > 0, "Cannot deposit rewards if there are no users deposits");
+        // Update total rewards tracking variable:
+        totalRewards += msg.value;
+        // Update the amount of rewards for each active user:
+        // Every time a reward is deposited (at the very same moment) the fractional reward corresponding to each user is computed (based on its current deposits)
+        // We are iterating over a list, this is probably not an elegant nor efficient solution (gas consumption)
+        for (uint i=0; i<usersAddressList.length; i++) {
+            address _addr = usersAddressList[i];
+            // Compute new reward to be added to this user (fraction):
+            // [OpenZeppelin safe math functions could be used here]
+            uint newUserReward = ((msg.value * users[_addr].depositedAmount) / totalUsersDeposits);
+            // Accumulate rewards corresponding to this user:
+            users[_addr].rewardAmount += newUserReward; 
+        }
+        // Trigger corresponding event:
+        emit rewardsDeposited(msg.sender, msg.value, block.timestamp);
+    }
+
+    // Allow users to check their deposits:
+    function queryUserDeposit() public view returns(uint256) {
+        return users[msg.sender].depositedAmount;
+    }
+    
+    // Function intended for the user to be able to withdraw (partial or full) deposits:
+    function withdrawalUserDeposit(uint256 amount) external {
+        // Users should not be able to withdraw more than they currently have deposited:
+        require(users[msg.sender].depositedAmount >= amount, "Trying to withdraw an amount higher than current deposits");
+        // Update total deposited amount:
+        totalUsersDeposits -= amount;
+        // Update user deposited amount:
+        users[msg.sender].depositedAmount -= amount;
+        // Transfer funds to the user:
+        (bool success, ) = payable(msg.sender).call{
+            value: amount
+            }("");
+        require(success, "Transfer failed");
+        emit userWithdrawalDeposit(msg.sender, amount, block.timestamp);
+
+    }
+
+    // Allow users to check their available rewards:
+    function queryUserRewards() public view returns(uint256) {
+        return users[msg.sender].rewardAmount;
+    }
+    
+    // Function intended for the user to be able to withdraw (partial or full) rewards:
+    function withdrawalUserReward(uint256 amount) external {
+        // Users should not be able to withdraw more than they currently have as rewards:
+        require(users[msg.sender].rewardAmount >= amount, "Trying to withdraw an amount higher than current rewards");
+        // Update total deposited rewards:
+        totalRewards -= amount;
+        // Update user deposited amount:
+        users[msg.sender].rewardAmount -= amount;
+        // Transfer funds to the user:
+        (bool success, ) = payable(msg.sender).call{
+            value: amount
+            }("");
+        require(success, "Transfer failed");
+        emit userWithdrawalRewards(msg.sender, amount, block.timestamp);
+    }
+
+}
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