critesjosh

Keybase proof

I hereby claim:

• I am critesjosh on github.
• I am critesjosh (https://keybase.io/critesjosh) on keybase.
• I have a public key ASALHa0sxv6oOg3lRoNaBG2hCwHcVMGGUiXAbF4L-p0bFgo

To claim this, I am signing this object:

critesjosh

pragma solidity ^0.5.0;

import "http://github.com/OpenZeppelin/openzeppelin-solidity/contracts/token/ERC20/ERC20.sol";

contract ERC20Lockable is ERC20 {
    
    mapping (address => uint) unlockTime;
    mapping (address => bool) isLocked;
    uint lockDuration = 1000;
    

critesjosh

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critesjosh

{
  "description": "This token certifies the holder as a graduate of the Devcon V Scholars program.", 
  "image": "https://i.ibb.co/mFz0Zjh/deva2019b-2.png", 
  "name": "Devcon V Scholar NFT",
  "external_url": "https://medium.com/ethereum-foundation-devcon-scholars"
}

critesjosh

pragma solidity ^0.5.0;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC721/ERC721MetadataMintable.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC721/ERC721Enumerable.sol";

contract Cert721 is ERC721MetadataMintable, ERC721Enumerable {
    
    constructor (string memory name, string memory symbol) 
        public 
        ERC721Metadata(name, symbol) 

critesjosh

{
"contractName": "SimpleStorage",
  "abi": [
    {
      "constant": false,
      "inputs": [
        {
          "name": "x",
          "type": "uint256"
        }

critesjosh

[
	{
		"constant": false,
		"inputs": [
			{
				"internalType": "address",
				"name": "account",
				"type": "address"
			}
		],

critesjosh

pragma solidity ^0.5.0; // Step 1

contract ProjectSubmission { // Step 1

    address owner; // Step 1 (state variable)
    uint ownerBalance;  // Step 4 (state variable)
    
    modifier onlyOwner() { // Step 1
      require(msg.sender == owner, "Only the owner can do this.");
      _;

critesjosh

pragma solidity >=0.4.0 <0.7.0;

// Rinkeby address: 0x49Bb098E781eD5C50D85E82d85cbA1a6F03FD3e6

contract SimpleStorage {
    uint storedData;
    
    event storageUpdate(uint newValue, address updatedBy);

    function set(uint x) public {

critesjosh

/*
    This exercise has been updated to use Solidity version 0.5
    Breaking changes from 0.4 to 0.5 can be found here: 
    https://solidity.readthedocs.io/en/v0.5.0/050-breaking-changes.html
    
    Reference Docs: https://solidity.readthedocs.io/en/latest/index.html
*/

pragma solidity ^0.5.0;