Devon Wesley devonwesley

☕

Probably at coffee shop in Oakland, CA.

I Blockchain

devonwesley / status.html

Created November 8, 2017 19:55

A status bar that helps us keep track of were we're at, in the compiling process.

	<div class="mui-container" style="float: left;">
	<p id="status" style="float: right; margin-top:20px"></p>
	</div>

devonwesley / compiler_select.html

Last active December 22, 2017 01:17

A way to select solidity compiler versions in a ui.

	<section class="mui-container-fluid">
	<div class="mui-row">
	<div class="mui-col-md-6">
	<div class="mui-select">
	<select id="versions"></select>
	</div>
	</div>
	</div>
	</section>

devonwesley / compile.html

Last active November 14, 2017 19:27

Code snippet for Web3JS blog

	<div class="mui-container-fluid">
	<div class="mui-row">
	<div class="mui-col-md-6">
	<div class="mui-panel">
	<p style="font-size:25px; font-weight:bold">
	Compile Contract
	</p>
	<textarea id="source" onclick="this.select()" style="height:360px; width: 600px; display:block; margin-left:20px"></textarea>
	<button class="mui-btn mui-btn--primary">
	Compile

devonwesley / HelloWorld.sol

Last active November 20, 2017 23:08

Simple hello world contract for a blog being written.

	pragma solidity ^0.4.18;

	contract HelloWorld {
	function displayMessage() constant returns (string) {
	return "Whale hello there!";
	}
	}

devonwesley / withdrawShares_zero_out.sol

Created October 14, 2017 00:40

	function withdrawShares() insureShareholder {
	uint shareCount = shares[msg.sender].shareCount;
	shares[msg.sender].shareCount = 0;

	if (msg.sender.send(shareCount)){
	SharesWithdrawn(msg.sender, shareCount);
	} else {
	shares[msg.sender].shareCount = shareCount;
	FailedSend(msg.sender, shareCount);
	}

devonwesley / Victim_mutex_solution.sol

Created October 13, 2017 23:57

	pragma solidity ^0.4.8;

	contract Victim {
	bool locked;

	/**
	@dev Modifier to insure that functions cannot be reentered
	during execution. Note there is only one global "locked" var, so
	there is a potential to be locked out of all functions that use
	the modifier at the same time.

devonwesley / 2_deploy_contracts.js

Created October 9, 2017 01:05

This is the flow of how we're going to deploy our contracts for our reentrancy attack demonstration.

	const Victim = artifacts.require('./Victim.sol')
	const Attacker = artifacts.require('./Attacker.sol')

	module.exports = function(deployer) {
	deployer
	.deploy(Victim)
	.then(() =>
	deployer.deploy(Attacker, Victim.address)
	)
	}

devonwesley / Attacker.sol

Created October 8, 2017 21:14

This is an "Attacker"s smart contract that drains the balance of a "Victim"s contract that it calls recursively.

	pragma solidity ^0.4.8;

	import './Victim.sol';

	contract Attacker {
	Victim v;
	uint public count;

	event LogFallback(uint c, uint balance);

devonwesley / Victim.sol

Created October 8, 2017 21:02

A Ethereum contract with the "Reentrancy" vulnerability (DO NOT DEPLOY, for demonstration only).

	pragma solidity ^0.4.8;

	contract Victim {

	function withdraw() {
	uint transferAmt = 1 ether;
	if (!msg.sender.call.value(transferAmt)()) throw;
	}

	function deposit() payable {}

devonwesley / gist:5ebc063fa95135d195af5e6ff2a4f047

Created August 13, 2017 07:22

jusdev89_ethereum_address_wallet

0x1418191f236A1ADdAC71848f09461593415084d9