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Ethereum Software

Original author(s)	Vitalik Buterin, Gavin Wood
Developer(s)	Gavin Wood, Jeffrey Wilcke, Vitalik Buterin, et al
Repository	github.com/ethereum
Written in	C++, Go, JavaScript, Python, Java, node.js, Haskell
Operating system	Linux, Windows, OS X, POSIX compliant
Type	Decentralized computing
License	GPL3, MIT, LGPL, et al
Website	www.ethereum.org

Ethereum is a cryptocurrency which includes a programmable smart contract platform. The unit of currency is called the ether.

Ethereum was initially described by Vitalik Buterin in late 2013, formally described by Gavin Wood in early 2014 in the so-called "yellow paper" and launched 30 July 2015. It is among a group of "next generation" (or "Bitcoin 2.0") platforms.

Purpose

The stated purpose of the Ethereum Project is to build and proliferate a decentralised Web 3.0 by introducing four components as part of its roadmap: incentivized static content publication (Swarm), pseudonymous low-level messaging system (Whisper), trustless transactions (Ethereum) and an integrated user-interface (Mist). Each of these services is designed to replace some aspect of the systems currently used in the modern web, but to do so in a fully decentralised and pseudonymous manner.

Development

Ethereum is an open source project. Development began in December 2013, with the first Go and C++ proof of concept builds (PoC1) being released in early February 2014. Since then, several further PoC builds have been released, culminating with the public launch of the Ethereum blockchain on 30 July 2015.

Ether

The currency unit of Ethereum is the ether, used to pay for computational services on the network.

To finance development, Ethereum distributed the initial allocation of ether via a 42-day public crowdsale, netting 31,591 bitcoins, worth $18,439,086 at that time, in exchange for about 60,102,216 ether.

Ether is divided into smaller units of currency called finney, szabo, shannon, babbage, lovelace, and wei (named after Wei Dai, the creator of b-money). Each larger unit is equal to 1000 of the next lower unit. In practice, however, the developers encourage the use of ether and wei. Wei is the base unit of implementation and cannot be further divided.

Contracts

Smart contracts are a set of promises, specified in digital form, including protocols within which the parties perform on these promises. In Ethereum, contracts are one of the two main types of accounts (the other being normal or externally controlled accounts), and can be implemented in one of the following three higher-level languages:

• Solidity, a JavaScript-like language officially supported by Ethereum and co-created by Gavin Wood and Christian Reitweissner. It has extensive documentation and a browser-based development environment.
• Serpent, a Python-like language created by Vitalik Buterin
• LLL, a Lisp-like language

They are compiled into bytecode for the Ethereum Virtual Machine before being deployed to the blockchain.

Every contract is run on every full Ethereum node simultaneously and the result is the consensus of the output. The documentation notes that computation on the EVM is "very expensive" and that "you will not be able to do anything on the EVM that you cannot do on a smartphone from 1999."

Implementations

The following full-node implementations of Ethereum are available:

• Geth, written in Go
• Eth, written in C++
• Ethereum J, written in Java
• pyethapp, written in Python
• ethereumjs, written in JavaScript
• ethereumH, written in Haskell

Media

The platform has been covered in The Wall Street Journal, Wired, The Globe and Mail, SiliconANGLE, Al Jazeera, The Telegraph and the Keiser Report.

References

1. Buterin, Vitalik. "The Problem of Censorship". Ethereum Blog. Retrieved 6 June 2015.
2. Buterin, Vitalik (2014-01-23). "Ethereum: A Next-Generation Cryptocurrency and Decentralized Application Platform". Bitcoin Magazine. Retrieved 9 April 2014.
3. Wood, Gavin (2014-04-06). "Ethereum: A Secure Decentralised Generalised Transaction Ledger" (PDF). Self published. Retrieved 20 February 2015.
4. Tual, Stephan. "Ethereum Launches". blog.ethereum.org. Retrieved 31 July 2015.
5. Kharif, Olga (2014-03-28). "Bitcoin 2.0 Shows Technology Evolving Beyond Use as Money". Bloomberg News. Retrieved 11 April 2014.
6. Gerring, Taylor (2014-08-18). "building the decentralized web 3.0". Retrieved 20 April 2015.
7. Winters, Tristan (2014-04-25). "Web 3.0 – A Chat With Ethereum's Gavin Wood". Retrieved January 2015. {{cite web}}: Check date values in: |accessdate= (help)
8. Tual, Stephan. "C++ Code+Build FAQ". Ethereum. Retrieved 3 September 2014.
9. What is ether?
10. "The symbol for Ether is..." 7 June 2014. Retrieved August 14, 2014.
11. Genesis block
12. The Issuance Model in Ethereum
13. "Crypto 2.0 Roundup: Block Chain Bloat, Ethereum Completes Presale and a Crypto Football Team". CoinDesk. https://plus.google.com/+Coindesk/. Retrieved 2015-11-13. {{cite web}}: External link in |publisher= (help)
14. ^ Buterin, Vitalik. "[English] White Paper: A Next-Generation Smart Contract and Decentralized Application Platform". ethereum / wiki on GitHub. Self-published. Retrieved 11 April 2014.
15. "Solidity Documentation". Ethereum. Retrieved 29 November 2015.
16. "Solidity Origin". stackedit. Retrieved 18 December 2015.
17. Solidity documentation
18. Solidity realtime compiler and runtime
19. https://github.com/ethereum/wiki/Ethereum-Development-Tutorial
20. go-ethereum homepage
21. Ethereum C++ Client GitHub repository
22. Ethereum J homepage
23. pyethapp GitHub repository
24. ethereumjs homepage
25. ethereum-client-haskell GitHub repository
26. Paul Vigna (28th October 2015). Microsoft to Offer Ethereum Based Services. The Wall Street Journal. Retrieved 7 November 2015.
27. Finley, Kurt (2014-01-27). "Out in the Open: Teenage Hacker Transforms Web Into One Giant Bitcoin Network". Wired. Retrieved 6 April 2014.
28. Gray, Jeff (2014-04-07). "Bitcoin believers: Why digital currency backers are keeping the faith". The Globe and Mail. Phillip Crawley. Retrieved 6 April 2014.
29. Cox, Ryan. "Can Ethereum kill Bitcoin with self-executing contracts?". SiliconANGLE. Retrieved 6 April 2014.
30. Nathan Schneider (7 April 2014). Code your own utopia: Meet Ethereum, bitcoin's most ambitious successor. Al Jazeera America. Retrieved 10 June 2014.
31. Soon, the internet will be impossible to control. Jamie Bartlett. Retrieved 19 December 2014.
32. Keiser Report: New Crypto Phenomenon Ethereum. Max Keiser. Retrieved 10 June 2014.

External links

• Official website

• Cross-platform software
• Cryptocurrencies