||This article appears to contain a large number of buzzwords. (June 2017)|
The Ethereum Project's logo, first used in 2014
|Initial release||30 July 2015|
|Written in||C++, Go, Rust|
|Operating system||Clients available for Linux, Windows, macOS, POSIX, Raspbian|
Ethereum is an open-source, public, blockchain-based distributed computing platform featuring smart contract (scripting) functionality, which facilitates online contractual agreements. 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 mitigate 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, with 11.9 million coins "premined" for the crowdsale. This accounts for approximately 13 percent of the total circulating supply.[when?]
In 2016 Ethereum was forked into two blockchains, as a result of the collapse of The DAO project. The two chains have different numbers of users, and the minority fork was renamed to Ethereum Classic. The majority fork has retained the name Ethereum (the subject of this article).
- 1 History
- 2 Architecture
- 3 Ecosystem
- 4 References
- 5 External links
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.:88
The original four members of the Ethereum team were Vitalik Buterin, Mihai Alisie, Anthony Di Iorio, and Charles Hoskinson. Formal development of the Ethereum software project began in early 2014 through 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.
Several prototypes of the Ethereum platform were developed by the Foundation, as part of their Proof-of-Concept series, prior to the official launch of the Frontier network. The last of these prototypes culminated in a public beta pre-release known as "Olympic". The Olympic network provided users with a bug bounty of 25,000 ether for stress testing the limits of the Ethereum blockchain.
After Olympic, the Foundation announced the beginning of the Frontier network to mark the tentative experimental release of the Ethereum platform in July of 2015. Since the initial launch, Ethereum has undergone several planned protocol upgrades called milestones, which are important changes affecting the underlying functionality and/or incentive structures of the platform.
The current milestone is named "Homestead" and is considered stable. It includes improvements to transaction processing, gas pricing, and security. There are at least two other protocol upgrades planned in the future, i.e. Metropolis and Serenity. Metropolis is intended to reduce the complexity of the EVM and provide more flexibility for smart contract developers. The move to Serenity is still uncertain, but should include a fundamental change to Ethereum's consensus algorithm to enable a basic transition from hardware mining (proof-of-work) to virtual mining (proof-of-stake). Improvements to scalability, specifically sharding, are also said to be a key objective on the development roadmap.
|Version||Code name||Release date|
|Old version, no longer supported: 0||Olympic||May, 2015|
|Old version, no longer supported: 1||Frontier||30 July 2015|
|Current stable version: 2||Homestead||14 March 2016|
|Future release: 3||Metropolis||TBA|
|Future release: 4||Serenity||TBA|
The DAO hard fork
|This section may require cleanup to meet Wikipedia's quality standards. The specific problem is: WP:OVERKILL and WP:NPOV (June 2017) (Learn how and when to remove this template message)|
In 2016 a decentralized autonomous organization called The DAO, a set of smart contracts developed on the platform, raised a record US$150 million in a crowdsale to fund the project. The DAO was subjected to an exploit in June where US$50 million in ether were claimed by an anonymous entity. The event sparked a debate in the crypto-community about whether Ethereum should perform a contentious "hard fork" to reappropriate the stolen funds. As a result of the dispute, the network split in two. A minority who rejected the protocol update adopted the pre-fork version of the Ethereum blockchain and called it Ethereum Classic, while the majority who supported have moved forward with the official post-fork Ethereum blockchain.
The hard fork created a rivalry between the two networks. The people who continued with Ethereum Classic advocate for blockchain immutability, code is law, and essentially rebellion against the pro-fork side (Ethereum) which largely argued for extra-protocol intentionality, decentralized decision-making, and conflict resolution. Various critics of Ethereum Classic have denounced it as a scam and a potential theft of intellectual property, with similar controversial remarks being made on behalf of the opposing camp. Ethereum Classic has retained some users of Ethereum and has also attracted others from the wider crypto-community who reject contentious forks on ideological grounds. The project, however, is not officially supported by the Ethereum Foundation, nor is it generally endorsed by the consortium of developers, business partners, miners, and users of the Ethereum ecosystem.
After the initial hard fork, Ethereum subsequently forked two times in the fourth quarter of 2016 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.
|Symbol||Ξ or ETH|
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 17 June 2016. As of June 2017, the value of ether had risen to more than $400, a 5,000% rise since the beginning of the year. Volatility continued, however, including a "flash crash" triggered by a large sell order on one exchange which briefly dropped the price to $0.10, after which it recovered to more than $300.
Ethereum Virtual Machine
The Ethereum Virtual Machine (EVM) is the runtime environment for smart contracts in Ethereum. The formal definition of the EVM is 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 C++, Go, Haskell, Java, Python, Ruby, Rust, and WebAssembly (currently under development).
Smart contracts are deterministic exchange mechanisms controlled by digital means that can carry out the direct transaction of value between untrusted agents. They can be used to facilitate, verify, and enforce the negotiation or performance of economically-laden procedural instructions and potentially circumvent censorship, collusion, and counter-party risk. In Ethereum, smart contracts are treated as autonomous scripts or stateful decentralized applications that are stored in the Ethereum blockchain for later execution by the EVM. Instructions embedded in Ethereum contracts are paid for in ether (or more technically "gas") and can be implemented in a variety of Turing complete scripting languages.
Contracts on the public blockchain
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.
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 lower 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.
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.
The projects listed in this section are not exhaustive and may be outdated.
Clients and wallets
- cpp-ethereum — Client implementation in C++.
- Geth — Client implementation in Go.
- Hyperledger Burrow - Ethereum virtual machine implementation in Go, built by Monax.
- Jaxx — Web wallet.
- KeepKey — Hardware wallet.
- Ledger Nano S — Hardware wallet.
- Mist — Desktop wallet.
- MyEtherWallet — Web wallet.
- Parity — Client implementation in Rust.
- 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
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).
Enterprise Ethereum Alliance (EEA)
In March 2017, various blockchain start-ups, research groups, and Fortune 500 companies announced the creation of the Enterprise Ethereum Alliance (EEA) — a nonprofit organization with over 116 enterprise members — including ConsenSys, Cornell University's research group, Toyota Research Institute, Samsung SDS, Microsoft, Intel, J.P. Morgan, Merck & Co., DTCC, Deloitte, Accenture, Banco Santander, BNY Mellon, ING, and National Bank of Canada. The purpose of the EEA is to coordinate the engineering of an open-source standard and private "permissioned" version of the Ethereum blockchain that can address the common interests of enterprises in banking, management, consulting, automotive, pharmaceutical, health, technology, mobile, entertainment, and other industries, while working with developers from the Ethereum ecosystem. Certain members of the alliance have also indicated a desire to investigate and collaborate on hybrid architectures to potentially anchor private blockchains to the public Ethereum blockchain in the future, although concerns remain over the security, compliance, and regulations involved in bridging such permissioned and "permissionless" blockchains.
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.
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Media related to Ethereum at Wikimedia Commons