Lottery as a Smart Contract: The Business Logic

Lottery as a Smart Contract: The Business Logic

Writing a lottery contract is a great way to learn important Smart Contract concepts such as State, Event and Visibility. In this 3 part series, I will describe the logic and codes behind a Lottery Smart Contract. In developing my Lottery Contract, I used Oraclize, a data carrier service that executes external JSON web services.

Motivation

Escrow Service as a Smart Contract: The Business Logic

Escrow Service as a Smart Contract: The Business Logic

An area of Smart Contract development that has consistently intrigued me is its real world usage to disintermediate the middleman. There's one gem of a Smart Contract that achieves this in the Solidity documentation called Safe Remote Purchase.  This is the first blog post of a 2-parter where I will document how to execute Safe Remote Purchase using a combination of Remix and MetaMask.

Syncing Geth to the Ethereum Blockchain

Syncing Geth to the Ethereum Blockchain

(Updated, 29th May 2018: I have written an update to this article. Consider reading Ethereum Geth Syncing 101 in 2018 instead)

I run geth on my cloud server to sync with the Ethereum Blockchain. I start geth whenever I code and it goes into a round of resynchronization with the Blockchain. This takes anything from minutes (that's if the last time I code is yesterday), or hours (if the last time I did this was months ago). 

A DApp to capture supper expenses for buddies

Going Dutch - A Dapp to capture supper expenses for buddies

This is a continuation of the Going Dutch Smart Contract project that I started on 2nd Sep 2017. It has been a month, which is probably the equivalent of a year if you count in blockchain-time. Geth has gone from 1.6.7 to 1.7.2 and after upgrading my setup, I had to let it run overnight (in fast mode!) to sync my node to the block again.

Objective