Ethereum development accelerated significantly in August with the release of Proof of Concept 5 (PoC5) just before the crowdsale. This milestone marked the first time Ethereum had two functional clients - one written in C++ and another in Go - demonstrating important progress in the platform's multi-client ecosystem development.
Serpent blockchain protocol has completed upgrades to PoC5 compatibility over the past two weeks, focusing on updating all clients. The upgrades include changes to the virtual machine, particularly a new init/code mechanism for contract creation.
This article appears to be a programming tutorial for Pyethereum and Serpent targeting Ethereum's Proof of Concept 5 (PoC5) implementation. The tutorial notes that instructions are incompatible with older PoC4 implementations and references recent protocol changes to Ethereum.
