Goal: This lab will teach you how to create a simple cryptocurrency token based on Ethereum, the next-generation smart contract and decentralized application platform, on your local virtual machine. Token systems and currencies are databases with one primary operation, which is subtracting X units from database A, and correspondingly adding X units to database B, with the following provision:

1. Database A has at least X units before the transaction.

2. The transaction is approved by A.

This logic can be easily implemented into a contract based on Ethereum smart contract platform, many tokens have already been created and utilized for ICO (Initial Coin Offering) projects.

Follow the following direction on how to create your own cryptocurrency token by writing a Solidity program.

Open the Remix Solidity IDE link: https://remix.ethereum.org/

1. Create a new Solidity File, On the far left of the screen press the plus sign within the solid circle name your cryptocurrency whatever you like.
2. Modify, copy and paste the following code into the Remix Solidity IDE code writing and editing section:

3. pragma solidity ^0.5.3;

   contract RattlerCoin {

   string public name = 'RattlerCoin';

   //currency name. Please feel free to change it

   string public symbol = 'rc';

   //choose a currency symbol. Please feel free to change it

   mapping (address => uint) balances;

   //a key-value pair to store addresses and their account balances

   event Transfer(address _from, address _to, uint256 _value);

   //declaration of an event. Event will not do anything but add a record to the log

   constructor () public {

   //when the contract is created, the constructor will be called automatically

   balances[msg.sender] = 10000;

   //set the balances of creator account to be 10000. Please feel free to change it to any number you want.

   }

   function sendCoin(address _receiver, uint _amount) public returns(bool sufficient) {

   if (balances[msg.sender] < _amount) return false;

   // validate transfer

   balances[msg.sender] -= _amount;

   balances[_receiver] += _amount;

   emit Transfer(msg.sender, _receiver, _amount);

   // complete coin transfer and call event to record the log

   return true;

   }

   function getBalance(address _addr) public view returns(uint) {

   //balance check

   return balances[_addr];

   }

4. Now compile

5. Now, click Run button on the right side. It generates a new transaction with parameters
6. Now under the Run tab, hit Deploy to create your own cryptocurrency.
7. Once your currency is deployed a transaction summary will be displayed below the code writing and editing section, fill the information below:
   1. After filling in the information,write the pseudocode for the Cryptocurrency

      1. transaction hash-

         contract address-

         from-

         to-

         gas-

         transaction cost-

         execution cost-

         hash-

         input-

         decoded input-

         decoded output-

         logs-

         value-