Doroidotchi - The Tamagotchi-like Smart Contract

I've wanted to sit down and get a bit more familiar with ethereum and Solidity, but I tend to do best with an idea to pull off. Although it's a big job to be involved in the financial revolution, sometimes you just need something silly to hack out in an…

Hey, can I see your yellow badge?

The Yellow Badge is a mark found on some of the most tired, stressed, and driven patrons of DEF CON. These people walk with a purpose, talk with a coarse throat, and are always eager to share what they have been working on (assuming nothing is on fire at the…

Coin Canaries

Knowing when a breach has taken place is extremely important - nobody in an organization will begin to react appropriately if everything appears to be running smoothly. Unfortunately, it can be quite difficult to actually detect, at least until it's too late. Our hot wallet sure is running low! Time…

Generating Addresses in PostgreSQL

During my initial dirty-hack of the coindroids system for defcon/defcoin, we took a lazy step and just pre-populated an address table with a boatload of addresses generated outside the system. While this was great for preparing for a three day conference, it obviously isn't ideal for a real production…

Introducing Coindroids

It's the year 20XX, long since the original accounting droid, the EconoDroid, had been created by the humans. The droids have since learned quite a bit from their once squishy overlords and now conduct war purely with money, specifically the blunt ample math based instrument that are cryptocurrencies. Droids themselves…

The Honeypot of Cryptocurrencies: DEFCOIN

As I spoke about in a previous post, I am fairly drawn to details about DEFCOIN, the cryptocurrency set to make its major debut at DEF CON 22. Under the hood, DEFCOIN is just another altcoin, a find/replace of the litecoin source with the word defcoin instead. There really…