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About Joel Garcia

Founder @AllCodeCom, CTO @ConsejoSano_US, VPE @LiveVox, VPE Med-VantageSan Francisco, CA

Pareto Network’s ERC20 Smart Contract Audit Report

By |August 27th, 2018|

# 1. Introduction

This document is a security audit of Pareto Network’s ERC-20 token contract supporting their decentralized ecosystem.

The scope of the security audit was restricted to:

* Scan the contracts listed above for generic security issues using automated systems and manually inspecting the results.
* Manually auditing the contracts listed above for security issues.

# 2. Files Audited

We […]

Configuring the NEO-GUI and NEO-LUX to use different NEO Seed Nodes

By |August 24th, 2018|

It is important to specify your NEO Seed Nodes, if you want to get the NEO blockchain up and running on your machine.

If you download the neo-gui from the NEO Project or neo-lux or neo-python from the City of Zion, you will run into issues synching the NEO blockchain. These projects are configured by default to […]

How to Deploy a Crowdsale Initial Coin Offering (ICO) to your own Private Testnet

By |September 27th, 2017|

We’ve been trying to deploy a Crowdsale Initial Coin Offering (ICO) Solidity contract to the Ethereum block chain for the better part of 2 months.

We’ve looked into the Open Zeppelins tutorials on How to Create Token an Initial Coin Offering using Truffle and Open Zeppelin. We were able to compile their Crowdsale ICO, but each […]

Ethereum Truffle Pet Shop DApp running on an Amazon EC2 Instance

By |August 24th, 2017|

In this tutorial, we’re going to deploy the Ethereum Truffle Pet Shop DApp demo to an AWS EC2 Micro instance.

If you’ve played with Ethereum’s Solidity programming language to deploy smart contracts to the blockchain, you’ve come to the realization that Ethereum and Solidity are desperately in need of a development framework. Truffle is the best […]

Successful Health Apps Part 2: User-Centered Design

By |August 3rd, 2017|

 

Here is the second part of our blog series on building a successful healthcare application for web or mobile. This post focuses on utilizing ‘user-centered design’ methodologies to enhance the usability and usefulness of your app. But firstly, what is ‘user-centered design’?

User-centered design (UCD) or user-driven development (UDD) is a rigorous, user-focused methodology which […]

Technical Analysis of the $31 Million Dollar Ethereum Hack

By |July 22nd, 2017|

Here’s an interesting analysis of the $31 Million Ethereum Hack.

https://medium.freecodecamp.org/a-hacker-stole-31m-of-ether-how-it-happened-and-what-it-means-for-ethereum-9e5dc29e33ce

From a technical standpoint, it appears as though the software developers who built the Parity wallet put in a catch all function that enables unknown functions that are payable, that send you Ether, to default to depositing the Ether.

function() payable {
//msg.value is […]

How to Serve Up Web Content from Ethereum – Part 4 – Ethereum Mining on TestNet

By |July 21st, 2017|

This tutorial is part of a series of blog posts on getting a web page on your web server to communicate via web3 with your Ethereum test network on localhost.

In our previous post, we created the first block in our testnet using a CustomGenesis.json. In the CustomGenesis.json, we set the difficulty attribute to a very low […]

How to Serve Up Web Content from Ethereum – Part 3 – Setting Up Your Own Private Testnet with a Genesis Block

By |July 20th, 2017|

This tutorial is part of a series of blog posts on getting a web page on your web server to communicate via web3 with your Ethereum test network on localhost.

In our previous post, we installed Geth on Mac OS X. When Geth is initially started on a Mac, Geth will start to synch with the production blockchain. […]

How to Serve Up Web Content from Ethereum – Part 2 – Download Geth on Mac OS X

By |July 13th, 2017|

This tutorial is part of a series of blog posts on getting a web page on your web server to communicate via web3 with your Ethereum on localhost.

In our previous post, we installed the Ethereum Wallet. The Ethereum Wallet is a nice way to visualize what’s going on with Ethereum, but for our purposes initially we don’t […]

How to Serve Up Web Content from Ethereum – Part 1 – Install Ethereum Wallet

By |July 13th, 2017|

This tutorial is part of a series of blog posts on getting a web page on your web server to communicate via web3 with your Ethereum Wallet on localhost.

In the process of trying to build a simple distributed app, Dapp, I encountered a ton of examples that do not work.

The first step in most of the examples that […]