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About Joel Garcia

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

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 […]

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 […]

Setting up your Ethereum Eth Environment on a Mac OS X

By |June 27th, 2017|

Setting up your Ethereum Eth Development Environment on a Mac OS X
Firstly, to install Ethereum Eth download the latest stable binary of cpp-ethereum, and install on your chosen operating system.

I’m running on Mac so I’ll install via Homebrew
brew update
brew upgrade
brew tap ethereum/ethereum
brew install cpp-ethereum

In the installation of cpp-ethereum, I ran into a compilation error

[…]

“How Do I Raise Investment?” Advice for Healthcare Startups

By |June 16th, 2017|

Hi Healthcare Startup Innovators!
We are scheduling our next Meetup for June 22nd in Arent Fox LLP, Downtown SF. The evening will kick-off at 6pm with snacks and networking, with the event proper starting at 6:30 / 6:40pm and run until 8pm. Of course you are welcome to join us for as much or as little […]

Migrate PostgreSQL AWS Database Instances Quickly

By |April 15th, 2017|

Learn how to migrate PostgreSQL AWS database instances like an expert.

We had the need to migrate a Postgres AWS database from a Production to Staging EC2 yesterday, so we decided to write it up for posterity.

Navigate out to the production instance via ssh. I will typically write a shell script that executes the following command. You […]