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Ethereum

The Ethereum Project's logo, first used in 2014.
Initial release	30 July 2015
Repository	github.com/ethereum
Written in	C++, Go, Rust
Operating system	Clients available for Linux, Windows, macOS, POSIX, Raspbian
Platform	x86, ARM
Type	Decentralized computing
License	Multiple open-source licenses
Website	www.ethereum.org

Ethereum is an open-source, public, blockchain-based distributed computing platform featuring smart contract (scripting) functionality. It provides a decentralized Turing-complete virtual machine, the Ethereum Virtual Machine (EVM), which can execute scripts using an international network of public nodes. Ethereum also provides a cryptocurrency token called "ether", which can be transferred between accounts and used to compensate participant nodes for computations performed. Gas, an internal transaction pricing mechanism, is used to prevent spam and allocate resources on the network.

Ethereum was proposed in late 2013 by Vitalik Buterin, a cryptocurrency researcher and programmer. Development was funded by an online crowdsale during July–August 2014. The system went live on 30 July 2015.

History

Origin

Ethereum was initially described in a white paper by Vitalik Buterin, a programmer involved with Bitcoin, in late 2013 with a goal of building decentralized applications. Buterin had argued that Bitcoin needed a scripting language for application development. Failing to gain agreement, he proposed development of a new platform with a more general scripting language.

The Ethereum software project was initially developed in early 2014 by a Swiss company, Ethereum Switzerland GmbH (EthSuisse). Subsequently, a Swiss non-profit foundation, the Ethereum Foundation (Stiftung Ethereum) was set up as well. Development was funded by an online public crowdsale during July–August 2014, with the participants buying the Ethereum value token (ether) with another digital currency, bitcoin. While there was early praise for the technical innovations of Ethereum, questions were also raised about its security and scalability.

Launch

Ethereum's live blockchain was launched on 30 July 2015. The initial version of Ethereum—called "Frontier"—uses a proof of work consensus algorithm, although a later version is expected to replace that with a proof of stake algorithm.

Ethereum milestones

Since the initial launch, the Ethereum network has undergone several planned protocol upgrades called milestones, which are important changes affecting the overall design or functionality of the platform.

Features

Ether

The value token of the Ethereum blockchain is called ether. It is listed under the diminutive ETH and traded on cryptocurrency exchanges. It is also used to pay for transaction fees and computational services on the Ethereum network.

Tokens can be volatile per circumstances, such as ether's plunge from $21.50 to $8 when The DAO was hacked on June 17, 2016.

Ethereum Virtual Machine

The Ethereum Virtual Machine (EVM) is the runtime environment for smart contracts in Ethereum. The opcodes available to the EVM are specified in the Ethereum Yellow Paper by Gavin Wood. It is sandboxed and also completely isolated from the network, filesystem or other processes of the host computer system. Every Ethereum node in the network runs an EVM implementation and executes the same instructions. Ethereum Virtual Machines have been implemented in go, C++, Python, Ruby, and WebAssembly (currently under development).

Smart contracts

Smart contracts are applications with a state stored in the blockchain. They can facilitate, verify, or enforce the negotiation or performance of a contract. Ethereum contracts can be implemented in various Turing complete scripting languages. The Ethereum system has been described by the New York Times as "a single shared computer that is run by the network of users and on which resources are parceled out and paid for by Ether."

Contracts on the public blockchain

As the contracts can be public, it opens up the possibility to prove functionality, e.g. self-contained provably fair casinos.

One issue related to using smart contracts on a public blockchain is that bugs, including security holes, are visible to all but cannot be fixed quickly. One example of this is the 17 June 2016 attack on The DAO, which could not be quickly stopped or reversed.

There is ongoing research on how to use formal verification to express and prove non-trivial properties. A Microsoft Research report noted that writing solid smart contracts can be extremely difficult in practice, using The DAO hack to illustrate this problem. The report discussed tools that Microsoft had developed for verifying contracts, and noted that a large-scale analysis of published contracts is likely to uncover widespread vulnerabilities. The report also stated that it is possible to verify the equivalence of a Solidity program and the EVM code.

Programming languages

Smart contracts can be written in Solidity, Serpent and Viper (derivatives of Python), and LLL. The EVM also runs on Mutan (deprecated). The smart contracts are subsequently compiled into the EVM bytecode and deployed to run on the Ethereum blockchain.

Performance

In Ethereum all smart contracts are stored publicly on every node of the blockchain, which has trade-offs. The downside is that performance issues arise in that every node is calculating all the smart contracts in real time, resulting in slower speeds. Ethereum engineers have been working on sharding the calculations, but no solution had been detailed by early 2016. As of January 2016, the Ethereum protocol could process 25 transactions per second. In September 2016, Buterin presented proposals to increase scalability.

Use cases

The Ethereum platform has multiple proposed uses. Bloomberg describes it as "shared software that can be used by all but is tamperproof." Ethereum is used as a platform for decentralized applications, decentralized autonomous organizations and smart contracts, with "dozens of functioning applications built" on it by March 2016 according to the New York Times. The intended scope of applications include projects related to finance, the internet-of-things, farm-to-table produce, electricity sourcing and pricing, and sports betting. Decentralized autonomous organizations may enable a wide range of possible business models that were previously impossible or too costly to run.

Ecosystem

These projects listed in this section are not exhaustive and may be outdated.

Clients and wallets

• Geth — Client implementation in Go.
• Parity — Client implementation in Rust.
• cpp-ethereum — Client implementation in C++.
• Mist — Desktop wallet.
• MyEtherWallet — Web wallet.
• Jaxx — Web wallet.
• Ledger Nano — Hardware wallet

Decentralized applications

• Digital signatures that ensure authenticity and proof of existence of documents: the Luxembourg Stock Exchange has developed such a system
• Secure identity systems for the Internet: uPort
• Interactive grids for the Internet of Things (IoT), such as verification for physical assets utilizing Bluetooth low energy and near field communication chips. Slock.It is developing smart locks
• Digital tokens pegged to fiat currencies: Decentralized Capital. Spanish bank Santander is also involved in such a project
• Digital tokens pegged to gold: Digix
• Improved digital rights management for music: Imogen Heap used the technology
• Platforms for prediction markets: Augur (software), Gnosis
• Platforms for crowdfunding: the DAO (short for decentralized autonomous organization)
• Social media platforms with economic incentives: Backfeed, Akasha
• Decentralized marketplaces for physical items, financial products or energy: FreeMyVunk, Etheropt, TransActive Grid
• Mobile payments services for foreign workers: Everex
• Authenticate users and managing the billing process through smart contracts: RWE car charging

Enterprise software

Ethereum is being tested by enterprise software companies for various applications. Interested parties include Microsoft, IBM, JPMorgan Chase, Deloitte, R3, Innovate UK (cross-border payments prototype)

Permissioned ledgers

Ethereum is used and being investigated as a permissioned blockchain in various projects.

• J.P. Morgan Chase is developing a blockchain, atop Ethereum. The system, dubbed "Quorum," is designed to toe the line between private and public in the realm of shuffling derivatives and payments. The idea is to satisfy regulators who need seamless access to financial goings-on, while protecting the privacy of parties that don’t wish to reveal their identities nor the details of their transactions to the general public.
• Royal Bank of Scotland has announced that it has built a Clearing and Settlement Mechanism (CSM) based on the Ethereum distributed ledger and smart contract platform. According to a technical paper, "The test results evidenced a throughput of 100 payments per second, with 6 simulated banks, and a single trip mean time of 3 seconds and maximum time of 8 seconds. This is the level appropriate for a national level domestic payments system".

Criticism

The DAO hard fork controversy

In June 2016, The DAO, a platform for the autonomous governance of investment capital, was found to contain an unexpected code path which allowed the withdraw of an arbitrary amount of funds from the DAO. This was exploited by an unknown party on the 16th of June, who managed to move about one third of the Ether held then by the DAO (at the time valued at 50 million USD) into a clone of the DAO, a "ChildDAO" whose control was held by only this party. As a consequence of the way the DAO was programmed, these moved funds would remain unavailable for withdrawal for about a month.

The Ethereum community debated how and whether to reclaim the ether, and whether to shut down The DAO, as the decentralised nature of The DAO and of Ethereum meant a lack of a central authority that could take quick action, instead requiring community consensus. After a few weeks' discussion, on July 20, the network majority reached sufficient consensus to hard-fork the Ethereum blockchain and make reparations to The DAO investors for their lost funds. A minority within the community refused to accept the official decision and continued with the original orphaned chain, which has now come to be known as Ethereum Classic. Ethereum Classic (ETC) has retained some users of Ethereum and has also attracted others from the wider cryptocurrency community who reject contentious forks on ideological grounds. The project is considered controversial and is generally not supported by the official post-fork blockchain and its network of developers, business partners, miners, and users.

After The DAO fork, Ethereum subsequently forked multiple times to deal with other attacks. By the end of November 2016, Ethereum had increased its DDoS protection, de-bloated the blockchain, and thwarted further spam attacks by hackers.

References

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External links

• Ethereum Foundation (Stiftung Ethereum)

• Blockchains
• Cross-platform software
• Cryptocurrencies
• Ethereum