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=== Virtual Machine ===
=== Virtual Machine ===
The Ethereum Virtual Machine (EVM)<ref>{{cite web |url=http://ethdocs.org/en/latest/introduction/what-is-ethereum.html#ethereum-virtual-machine |title=What Is Ethereum?—Ethereum Homestead 0.1 documentation |website=ethdocs.org |deadurl=no |archiveurl=https://web.archive.org/web/20170427192602/http://ethdocs.org/en/latest/introduction/what-is-ethereum.html#ethereum-virtual-machine |archivedate=27 April 2017 |df=dmy-all}}</ref><ref name="IESevm">{{cite book |last=Dannen |first=Chris |date=2017 |chapter=The EVM |title=Introducing Ethereum and Solidity: Foundations of Cryptocurrency and Blockchain Programming for Beginners |publisher=Apress |pages=47–67 |ISBN=9781484225356}}</ref> is the runtime environment for smart contracts in Ethereum. It is a 256-bit register stack, designed to run the same code exactly as intended. It is the fundamental consensus mechanism for Ethereum. The formal definition of the EVM is specified in the Ethereum Yellow Paper.<ref name=":0" /><ref name="DEBA20">{{cite report |last=Triantafyllidis |first=Nikolaos Petros |date=19 February 2016 |chapter=The Ethereum Project: Ethereum History |title=Developing an Ethereum Blockchain Application |publisher=University of Amsterdam |page=20}}</ref> 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. On February 1, 2018, there were 27,500 nodes in the main Ethereum network.<ref>{{cite web |url= https://www.ethernodes.org/network/1 |title= ethernodes.org - The Network number 1 |website= ethernodes.org |accessdate= 2018-02-01}}</ref> Ethereum Virtual Machines have been implemented in [[C++]], [[Go (programming language)|Go]], [[Haskell (programming language)|Haskell]], [[Java (programming language)|Java]], [[JavaScript]], [[Python (programming language)|Python]], [[Ruby (programming language)|Ruby]], [[Rust (programming language)|Rust]], and [[WebAssembly]] (currently under development).<ref name="eWASM">{{cite web |url=https://www.crypto-news.net/ethereum-devs-publish-roadmap-for-evm-upgrade/ |last=Dannen |first=Chris |date=27 March 2017 |title=Ethereum Devs Publish Roadmap for EVM Upgrade |publisher=CryptoNews |deadurl=no |archiveurl=https://web.archive.org/web/20171225221125/https://www.crypto-news.net/ethereum-devs-publish-roadmap-for-evm-upgrade/ |archivedate=25 December 2017 |df=dmy-all}}</ref><ref>{{cite web |url=https://entethalliance.atlassian.net/wiki/display/EEA/Ethereum+Client+Implementations |title=Ethereum Client Implementations - EntEthAlliance - Confluence |website=entethalliance.atlassian.net}}</ref>
The Ethereum Virtual Machine (EVM)<ref>{{cite web |url=http://ethdocs.org/en/latest/introduction/what-is-ethereum.html#ethereum-virtual-machine |title=What Is Ethereum?—Ethereum Homestead 0.1 documentation |website=ethdocs.org |deadurl=no |archiveurl=https://web.archive.org/web/20170427192602/http://ethdocs.org/en/latest/introduction/what-is-ethereum.html#ethereum-virtual-machine |archivedate=27 April 2017 |df=dmy-all}}</ref><ref name="IESevm">{{cite book |last=Dannen |first=Chris |date=2017 |chapter=The EVM |title=Introducing Ethereum and Solidity: Foundations of Cryptocurrency and Blockchain Programming for Beginners |publisher=Apress |pages=47–67 |ISBN=9781484225356}}</ref> <ref>{{Cite news|url=https://www.ethos.io/what-is-ethereum/|title=What is Ethereum ETH? What is the Ethereum Blockchain?|work=Ethos|access-date=2018-11-13|language=en-US}}</ref>is the runtime environment for smart contracts in Ethereum. It is a 256-bit register stack, designed to run the same code exactly as intended. It is the fundamental consensus mechanism for Ethereum. The formal definition of the EVM is specified in the Ethereum Yellow Paper.<ref name=":0" /><ref name="DEBA20">{{cite report |last=Triantafyllidis |first=Nikolaos Petros |date=19 February 2016 |chapter=The Ethereum Project: Ethereum History |title=Developing an Ethereum Blockchain Application |publisher=University of Amsterdam |page=20}}</ref> 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. On February 1, 2018, there were 27,500 nodes in the main Ethereum network.<ref>{{cite web |url= https://www.ethernodes.org/network/1 |title= ethernodes.org - The Network number 1 |website= ethernodes.org |accessdate= 2018-02-01}}</ref> Ethereum Virtual Machines have been implemented in [[C++]], [[Go (programming language)|Go]], [[Haskell (programming language)|Haskell]], [[Java (programming language)|Java]], [[JavaScript]], [[Python (programming language)|Python]], [[Ruby (programming language)|Ruby]], [[Rust (programming language)|Rust]], and [[WebAssembly]] (currently under development).<ref name="eWASM">{{cite web |url=https://www.crypto-news.net/ethereum-devs-publish-roadmap-for-evm-upgrade/ |last=Dannen |first=Chris |date=27 March 2017 |title=Ethereum Devs Publish Roadmap for EVM Upgrade |publisher=CryptoNews |deadurl=no |archiveurl=https://web.archive.org/web/20171225221125/https://www.crypto-news.net/ethereum-devs-publish-roadmap-for-evm-upgrade/ |archivedate=25 December 2017 |df=dmy-all}}</ref><ref>{{cite web |url=https://entethalliance.atlassian.net/wiki/display/EEA/Ethereum+Client+Implementations |title=Ethereum Client Implementations - EntEthAlliance - Confluence |website=entethalliance.atlassian.net}}</ref>


===Smart contracts===
===Smart contracts===

Revision as of 09:21, 13 November 2018

Ethereum
Original author(s)Vitalik Buterin, Gavin Wood, Joseph Lubin
Initial release30 July 2015
Repository
Written inGo, C++, Rust
Operating systemClients available for Linux, Windows, macOS, POSIX, Raspbian
Platformx86, AMD64, ARM
TypeDecentralized computing, Blockchain, Cryptocurrency
LicenseGPLv3, LGPLv3, MIT[1][2]
Websitewww.ethereum.org Edit this on Wikidata

Ethereum is an open-source, public, blockchain-based distributed computing platform and operating system featuring smart contract (scripting) functionality.[3] It supports a modified version of Nakamoto consensus via transaction-based state transitions.

Ether is a cryptocurrency whose blockchain is generated by the Ethereum platform. Ether can be transferred between accounts and used to compensate participant mining nodes for computations performed.[4] Ethereum provides a decentralized Turing-complete virtual machine, the Ethereum Virtual Machine (EVM), which can execute scripts using an international network of public nodes. "Gas", an internal transaction pricing mechanism, is used to mitigate spam and allocate resources on the network.[3][5]

Ethereum was proposed in late 2013 by Vitalik Buterin, a cryptocurrency researcher and programmer. Development was funded by an online crowdsale that took place between July and August 2014.[6] The system went live on 30 July 2015, with 72 million coins "premined".[7] This accounts for about 70 percent of the total circulating supply in 2018.

In 2016, as a result of the exploitation of a flaw in The DAO project's smart contract software, and subsequent theft of $50 million worth of Ether,[8] Ethereum was split into two separate blockchains – the new separate version became Ethereum (ETH) with the theft reversed,[9] and the original continued as Ethereum Classic (ETC).[10][11][12] The value of the Ethereum currency grew over 13,000 percent in 2017, to over $1400.[13] By September 2018, it had fallen back to $200.[14]

Etymology

Vitalik Buterin picked the name Ethereum after browsing Wikipedia articles about elements and science fiction, when he found the name, noting, "I immediately realized that I liked it better than all of the other alternatives that I had seen; I suppose it was the fact that sounded nice and it had the word 'ether', referring to the hypothetical invisible medium that permeates the universe and allows light to travel."[15]

History

Ethereum was initially described in a white paper by Vitalik Buterin,[16] a programmer involved with Bitcoin Magazine, in late 2013 with a goal of building decentralized applications.[17][18] 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.[19]: 88 

At the time of public announcement in January 2014, the core Ethereum team was Vitalik Buterin, Mihai Alisie, Anthony Di Iorio, and Charles Hoskinson.[20] Formal development of the Ethereum software project began in early 2014 through a Swiss company, Ethereum Switzerland GmbH (EthSuisse).[21][22] Subsequently, a Swiss non-profit foundation, the Ethereum Foundation (Stiftung Ethereum), was created 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.[6] While there was early praise for the technical innovations of Ethereum, questions were also raised about its security and scalability.[17]

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) with 30 founding members.[23] By May, the nonprofit organization had 116 enterprise members—including ConsenSys, CME Group, Cornell University's research group, Toyota Research Institute, Samsung SDS, Microsoft, Intel, J. P. Morgan, Cooley LLP, Merck KGaA, DTCC, Deloitte, Accenture, Banco Santander, BNY Mellon, ING, and National Bank of Canada.[24][25][26] By July 2017, there were over 150 members in the alliance, including recent additions MasterCard, Cisco Systems, Sberbank and Scotiabank.[27][28]

Milestones

Version Code name Release date
Old version, no longer maintained: 0 Olympic May, 2015
Old version, no longer maintained: 1 Frontier 30 July 2015
Old version, no longer maintained: 2 Homestead 14 March 2016
Current stable version: 3 Metropolis (vByzantium) 16 October 2017
Future release: 3.5 Metropolis (vConstantinople) TBA[29]
Future release: 4 Serenity TBA
Legend:
Old version
Old version, still maintained
Latest version
Latest preview version
Future release

Several codenamed 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. "Olympic" was the last of these prototypes, and public beta pre-release.[30][31] The Olympic network provided users with a bug bounty of 25,000 ether for stress testing the limits of the Ethereum blockchain. "Frontier" marked the tentative experimental release of the Ethereum platform in July 2015.[32][33]

Since the initial launch, Ethereum has undergone several planned protocol upgrades, which are important changes affecting the underlying functionality and/or incentive structures of the platform.[34][35] Protocol upgrades are accomplished by means of a soft fork of the open source code base.

"Homestead" was the first to be considered stable.[36][37] It included improvements to transaction processing, gas pricing, and security[38][36][39] and the soft fork occurred on 31 July 2015.[19]: 87 

The "Metropolis Part 1: Byzantium" soft fork took effect on 16 October 2017, and included changes to reduce the complexity of the EVM and provide more flexibility for smart contract developers.[35] Byzantium also adds supports for zk-SNARKs (from Zcash); with the first zk-SNARK transaction occurring on testnet on September 19, 2017.[29]

There are at least two other protocol upgrades planned in the future: "Metropolis Part 2: Constantinople" will lay the foundations for the transition to proof-of-stake (Casper).[40]

The DAO event

Main article: The DAO (organization)

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.[41] The DAO was exploited in June when US$50 million in Ether were taken by an unknown hacker.[42][43] The event sparked a debate in the crypto-community about whether Ethereum should perform a contentious "hard fork" to reappropriate the affected funds.[44] As a result of the dispute, the network split in two. Ethereum (the subject of this article) continued on the forked blockchain, while Ethereum Classic continued on the original blockchain.[45] The hard fork created a rivalry between the two networks.[46]

After the hard fork related to The DAO, Ethereum subsequently forked twice in the fourth quarter of 2016 to deal with other attacks.[47] By the end of November 2016, Ethereum had increased its DDoS protection, de-bloated the blockchain, and thwarted further spam attacks by hackers.[39]

Ether

Ether
Denominations
SymbolΞ
CodeETH
Subunits
 10−9Gwei
 10−18Wei, after cryptocurrency pionneer Wei Dai
Ledger
Timestamping schemeProof-of-work Ethash
Hash functionKeccak
Issuance scheduleBlock and Uncle/Ommer reward
Block reward3 ETH (non-deterministic)
Block time14-15 seconds on average
Block exploreretherscan.io
Circulating supplyΞ98,316,894 (as of 20 March 2018)
Valuation
Exchange rateDecrease US$563.13  (as of 20 March 2018)

Ether is a fundamental cryptocurrency for operation of Ethereum, which thereby provides a public distributed ledger for transactions. It is used to pay for gas, a unit of computation used in transactions and other state transitions. Mistakenly, this currency is also referred to as Ethereum.[48] It is listed under the code ETH and traded on cryptocurrency exchanges, and the Greek uppercase Xi character (Ξ) is generally used for its currency symbol. It is also used to pay for transaction fees and computational services on the Ethereum network.[49]

Characteristics

Further information: Cryptocurrency

As with other cryptocurrencies, the validity of each ether is provided by a blockchain, which is a continuously growing list of records, called blocks, which are linked and secured using cryptography.[50][51] By design, the blockchain is inherently resistant to modification of the data. It is an open, distributed ledger that records transactions between two parties efficiently and in a verifiable and permanent way.[52] Unlike Bitcoin, Ethereum operates using accounts and balances in a manner called state transitions. This does not rely upon unspent transaction outputs (UTXOs). State denotes the current balances of all accounts and extra data. State is not stored on the blockchain, it is stored in a separate Merkle Patricia tree. A cryptocurrency wallet stores the public and private "keys" or "addresses" which can be used to receive or spend Ether. These can be generated through BIP 39 style mnemonics for a BIP 32 "HD Wallet". In Ethereum, this is unnecessary as it does not operate in a UTXO scheme. With the private key, it is possible to write in the blockchain, effectively making an ether transaction.[53] To send ether to an account, you need the public key of that account. Ether accounts are pseudonymous in that they are not linked to individual persons, but rather to one or more specific addresses.[54] Owners can store these addresses in software, on paper and possibly in memory ("brain wallet").

Addresses

Ethereum addresses are composed of the prefix "0x", a common identifier for hexadecimal, concatenated with the rightmost 20 bytes of the Keccak-256 hash (big endian) of the ECDSA public key. In hexadecimal, 2 digits represents a byte, meaning addresses contain 40 hexadecimal digits. One example is 0xb794F5eA0ba39494cE839613fffBA74279579268, the Poloniex ColdWallet. Contract addresses are in the same format, however they are determined by sender and creation transaction nonce.[55] User accounts are indistinguishable from contract accounts given only an address for each and no blockchain data. Any valid Keccak-256 hash put into the described format is valid, even if it does not correspond to an account with a private key or a contract. This is unlike Bitcoin, which uses base58check to ensure that addresses are properly typed.

Comparison to bitcoin

Ether is different from Bitcoin (the cryptocurrency with the largest market capitalization as of June 2018) in several aspects:

  • Its block time is 14 to 15 seconds, compared with 10 minutes for bitcoin.[56]
  • Mining of ether generates new coins at a usually consistent rate, occasionally changing during hard forks, while for bitcoin the rate halves every 4 years.[56]
  • For proof-of-work, it uses the Ethash algorithm which reduces the advantage of specialized ASICs in mining.
  • Transaction fees differ by computational complexity, bandwidth use and storage needs (in a system known as gas), while bitcoin transactions compete by means of transaction size, in bytes.[56]
  • Ethereum gas units each have a price that can be specified in a transaction. This is typically measured in Gwei. Bitcoin transactions usually have fees specified in satoshis per byte.
  • Transaction fees are generally considerably lower for ether than for Bitcoin. In December 2017, the median transaction fee for ether corresponded to $0.33, while for bitcoin it corresponded to $23.[57]
  • Ethereum uses an account system where values in Wei are debited from accounts and credited to another, as opposed to Bitcoin's UTXO system, which is more analogous to spending cash and receiving change in return. Both systems have their pros and cons: in terms of storage space, complexity, and security/anonymity.

Supply

The total supply of ether was Ξ100 million as of June 2018.[58] In 2017, mining generated 9.2 million new ether, corresponding to a 10% increase in its total supply.[59] Casper FFG and CBC are expected to reduce the inflation rate to between 0.5% to 2%.[60] There is no currently implemented hard cap on the total supply of ETH, but it is expected to end at a certain point, and become deflationary.

Markets and stores

Ether can be traded by regular currency brokers, cryptocurrency exchanges, as well as many online cryptocurrency wallets.[61] As of January 2018, at least 150 stores accept ether.[62]

Platform

Virtual Machine

The Ethereum Virtual Machine (EVM)[63][64] [65]is the runtime environment for smart contracts in Ethereum. It is a 256-bit register stack, designed to run the same code exactly as intended. It is the fundamental consensus mechanism for Ethereum. The formal definition of the EVM is specified in the Ethereum Yellow Paper.[55][66] 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. On February 1, 2018, there were 27,500 nodes in the main Ethereum network.[67] Ethereum Virtual Machines have been implemented in C++, Go, Haskell, Java, JavaScript, Python, Ruby, Rust, and WebAssembly (currently under development).[68][69]

Smart contracts

Ethereum's smart contracts are based on different computer languages, which developers use to program their own functionalities.[70] Smart contracts are high-level programming abstractions that are compiled down to EVM bytecode and deployed to the Ethereum blockchain for execution. They can be written in Solidity (a language library with similarities to C and JavaScript), Serpent (similar to Python, but deprecated), LLL (a low-level Lisp-like language), and Mutan (Go-based, but deprecated). There is also a research-oriented language under development called Viper (a strongly-typed Python-derived decidable language).[71]

Smart contracts can be public, which opens up the possibility to prove functionality, e.g. self-contained provably fair casinos.[72]

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.[73] One example of this is the 17 June 2016 attack on The DAO, which could not be quickly stopped or reversed.[42]

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.[74]

Applications

Ethereum is written in Turing complete language, which includes seven different programming languages.[75] Developers use the language to create and publish applications which they know will run inside Ethereum.[76][77] It’s a cumbersome system, but that’s not deterring developers from writing Ethereum programs.[78]

Ethereum blockchain applications are usually referred to as DApps (decentralized application), since they are based on the decentralized Ethereum Virtual Machine, and its smart contracts.[5] Many uses have been proposed for Ethereum platform, including ones that are impossible or unfeasible.[79][80][49] Use case proposals have included finance, the internet-of-things, farm-to-table produce, electricity sourcing and pricing, and sports betting.[49][81] Ethereum is (as of 2017) the leading blockchain platform for initial coin offering projects, with over 50% market share.[82]

As of January 2018, there are more than 250 live DApps, with hundreds more under development.[83] Some application examples include: digital signature algorithms, securitized tokens, digital rights management, crowdfunding, prediction markets, remittance, online gambling, social media platforms, financial exchanges and identity systems.

Enterprise software

Ethereum-based customized software and networks, independent from the public Ethereum chain, are being tested by enterprise software companies.[84] Interested parties include Microsoft, IBM, JPMorgan Chase,[49][85] Deloitte,[86] R3,[87] Innovate UK (cross-border payments prototype).[88][89] Barclays, UBS and Credit Suisse are experimenting with Ethereum blockchain to automate Markets in Financial Instruments Directive (MiFID) II requirements.[90]

Permissioned ledgers

Ethereum-based permissioned blockchain variants are used and being investigated for various projects.

  • J. P. Morgan Chase is developing a permissioned-variant of Ethereum blockchain dubbed "Quorum".[91] It's 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.[92]
  • 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.[93][94]

Performance

In Ethereum all smart contracts are stored publicly on every node of the blockchain, which has costs.[95] Being a blockchain means it is secure by design and is an example of a distributed computing system with high Byzantine fault tolerance. The downside is that performance issues arise in that every node is calculating all the smart contracts in real time, resulting in lower speeds.[95] As of January 2016, the Ethereum protocol could process 25 transactions per second.[95] In comparison, the Visa payment platform processes 45,000 payments per second leading some to question the scalability of Ethereum.[96] On 19 December 2016, Ethereum exceeded one million transactions in a single day for the first time.[97]

  • Micro Raiden was launched November 2017.[98]
  • Buterin and Joseph Poon (a co-author of Bitcoin's Lightning Network whitepaper) announced in 2017 their plan to launch a scaling solution called Plasma which creates "child" blockchains to the "main" parent blockchain.[99] The plasma project has skeptics; specifically, Vlad Zamfir (Ethereum's lead researcher on proof of stake) has publicly questioned the plasma project's viability.[99]
  • Ethereum engineers have been working on sharding the calculations, and the next step (called Ethereum 2) was presented at Ethereum's Devcon 3 in November 2017.[100]

Ethereum's blockchain uses Merkle trees, for security reasons, to improve scalability, and to optimize transaction hashing.[101] As with any Merkle tree implementation, it allows for storage savings, set membership proofs (called "Merkle proofs"), and light client synchronization. The Ethereum network has at times faced congestion problems, for example, congestion occurred during late 2017 in relation to Cryptokitties.[102]

Development Governance and EIP

In October 2015,[103] a development governance was proposed as Ethereum Improvement Proposal, aka EIP, standardized on EIP-1.[104] The core development group and community were to gain consensus by a process regulated EIP. A few notable decisions were made in the process of EIP, such as EIP-160 (EXP cost increase caused by Spurious Dragon Hardfork)[105] and EIP-20 (ERC-20 Token Standard).[106] In January 2018, the EIP process was finalized and published as EIP-1 status turned "active".[103]

Criticisms

Izabella Kaminska, the editor of FT Alphaville, has pointed out that criminals are using Ethereum to run Ponzi schemes and other forms of investment fraud.[107] The article was based on a paper from the University of Cagliari, which placed the number of Ethereum smart contracts which facilitate Ponzi schemes at nearly 10% of 1384 smart contracts examined. However, it also estimated that only 0.05% of the transactions on the network were related to such contracts.[108]

References

  1. ^ "ethereum". GitHub. Retrieved 11 January 2018.
  2. ^ "Go Ethereum GitHub repository". Archived from the original on 3 October 2016. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  3. ^ a b Understanding Ethereum (Report). CoinDesk. 24 June 2016.
  4. ^ Cryptocurrencies: A Brief Thematic Review Archived 25 December 2017 at the Wayback Machine. Social Science Research Network. Date accessed 28 August 2017.
  5. ^ a b ConsenSys (23 June 2016). "Ethereum, Gas, Fuel, & Fees". ConsenSys Media. Archived from the original on 23 May 2017. Retrieved 15 January 2017. {{cite news}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  6. ^ a b Aitken, Roger (23 April 2016). "Digital Gold 'Done Right' With DigixDAO Crypto-Trading on OpenLedger". Forbes. Archived from the original on 28 April 2016. Retrieved 28 April 2016. {{cite news}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  7. ^ "Ethereum Market Capitalization And Supply Statistics (etherscan.io archived)". Etherscan. 8 October 2018. Retrieved 8 October 2018. {{cite web}}: Check |archiveurl= value (help); Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  8. ^ Waters, Richard (18 June 2016). "'Ether' brought to earth by theft of $50m in cryptocurrency". ft.com. The Financial Times. Retrieved 19 October 2018.
  9. ^ Leising, Matthew (13 June 2017). "Ether thief remains mystery year after $55 million heist". www.bloomberg.com. Bloomberg News.
  10. ^ De Jesus, Cecille (19 July 2016). "The DAO Heist Undone: 97% of ETH Holders Vote for the Hard Fork". Futurism, LLC. Archived from the original on 7 August 2017. Retrieved 16 May 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  11. ^ Quentson, Andrew (17 July 2016). "Miners Vote Overwhelmingly in Support of Ethereum's Hardfork". Cryptocoinnews. Archived from the original on 26 June 2017. Retrieved 14 May 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  12. ^ Bradley, Miles (17 November 2016). "CoinDesk Research: Ethereum Hard Fork Had Little Impact on Sentiment". Coindesk. Archived from the original on 8 July 2017. Retrieved 14 May 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  13. ^ "Ethereum hits a fresh record high and is up over 13,000% in a year". CNBC. 8 January 2017.
  14. ^ "Beaten-down cryptocurrency ether is about to 'rally strongly,' says Wall Street's Tom Lee". CNBC. 27 September 2018.
  15. ^ Vitalik Buterin (2014). "So where did the name Ethereum come from?".
  16. ^ "White Paper· ethereum/wiki Wiki · GitHub". Archived from the original on 28 March 2015. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  17. ^ a b Finley, Klint (27 January 2014). "Out in the Open: Teenage Hacker Transforms Web Into One Giant Bitcoin Network". Wired. Archived from the original on 18 March 2016. Retrieved 21 March 2016. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  18. ^ Schneider, Nathan (7 April 2014). "Code your own utopia: Meet Ethereum, bitcoin's most ambitious successor". Al Jazeera. Archived from the original on 23 February 2016. Retrieved 21 February 2016. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  19. ^ a b Tapscott, Don; Tapscott, Alex (7 May 2016). The Blockchain Revolution: How the Technology Behind Bitcoin is Changing Money, Business, and the World. Portfolio. ISBN 978-0670069972.
  20. ^ Vitalik Buterin (23 January 2014). "Ethereum: Now Going Public". Archived from the original on 2 March 2014.
  21. ^ Schmid, Valentin (10 May 2014). "The Entrepreneur: Joe Lubin, COO of Ethereum". Epoch Times. Archived from the original on 25 April 2016. Retrieved 31 March 2016. {{cite news}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  22. ^ "Company Overview of Ethereum Switzerland GmbH". Bloomberg. 20 August 2016. Archived from the original on 20 August 2016. Retrieved 20 August 2016. The company was founded in 2014 and is based in Baar, Switzerland. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  23. ^ Popper, Nathaniel (27 February 2017). "Business Giants to Announce Creation of a Computing System Based on Ethereum". New York Times. Archived from the original on 20 June 2017. Retrieved 5 June 2017. {{cite news}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  24. ^ Peck, Morgan (2 March 2017). "Corporate Titans Unite to Build an Enterprise Version of the Ethereum Blockchain". Institute of Electrical and Electronics Engineers (IEEE). Archived from the original on 17 June 2017. Retrieved 5 June 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  25. ^ "Enterprise Ethereum Alliance expands dramatically announcing 86 new members" (PDF) (Press release). Enterprise Ethereum Alliance (EEA). 19 May 2017. Archived from the original (PDF) on 7 June 2017. Retrieved 5 June 2017. {{cite press release}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  26. ^ Shin, Laura (22 May 2017). "Ethereum Enterprise Alliance Adds 86 New Members Including DTCC, State Street And Infosys". Forbes. Archived from the original on 22 May 2017. Retrieved 22 May 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  27. ^ "The Enterprise Ethereum Alliance Just Got A Whole Lot Stronger".
  28. ^ "Sberbank joins Enterprise Ethereum Alliance to broaden cooperation"(19 Oct 2017). Fintech Futures News. Retrieved 6 June 2018.
  29. ^ a b O'Leary, Rachel Rose (19 September 2017). "Ethereum's Byzantium Testnet Just Verified A Private Transaction". CoinDesk. Archived from the original on 23 September 2017. Retrieved 24 September 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  30. ^ Buterin, Vitalik (9 May 2015). "Olympic: Frontier Pre-Release". Ethereum Foundation. Archived from the original on 2 June 2017. Retrieved 5 June 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  31. ^ Lombardo, Hans (17 May 2015). "Ethereum Debuts "eπ" Ethereum-on-Raspberry Pi as Olympic Whirs before Frontier Release". Allcoinsnews. Archived from the original on 20 August 2017. Retrieved 5 June 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  32. ^ Gupta, Vinay (12 March 2015). "Getting to the Frontier". Ethereum Foundation. Archived from the original on 8 May 2015. Retrieved 5 June 2015. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  33. ^ Vigna, Paul (31 July 2015). "BitBeat: Ethereum Opens Its 'Frontier' for Business". The Wall Street Journal. Archived from the original on 6 September 2017. Retrieved 5 June 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  34. ^ Gupta, Vinay (3 March 2015). "The Ethereum Launch Process". Ethereum Foundation. Archived from the original on 6 June 2017. Retrieved 5 June 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  35. ^ a b Silva, Los (25 February 2017). "Ethereum's Road Map for 2017". ETHNews. Archived from the original on 2 June 2017. Retrieved 5 June 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  36. ^ a b "Ethereum Homestead Documentation: The Homestead Release". Ethereum Foundation. n.d. Archived from the original on 6 June 2017. Retrieved 5 June 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  37. ^ Donnelly, Jacob (14 March 2016). "Ethereum Blockchain Project Launches First Production Release". CoindDesk. Archived from the original on 6 June 2017. Retrieved 5 June 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  38. ^ Wilcke, Jeffrey (29 February 2016). "Homestead Release". Ethereum Foundation. Archived from the original on 3 June 2017. Retrieved 5 June 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  39. ^ a b Hertig, Alyssa (22 November 2016). "Ethereum's Fourth Blockchain Fork: So Far, So Good". CoinDesk. Archived from the original on 27 May 2017. Retrieved 5 June 2017. {{cite news}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  40. ^ "Metropolis Part 2: Constantinople & What's In Store for Etheruem?". CryptoCanucks. 4 November 2017. Retrieved 21 February 2018.
  41. ^ Vigna, Paul (16 May 2016). "Chiefless Company Rakes in More than $100 Million". Wall Street Journal. Archived from the original on 25 June 2017. Retrieved 14 May 2017. {{cite news}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  42. ^ a b Popper, Nathaniel (18 June 2016). "Hacker May Have Taken $50 Million From Cybercurrency Project". The New York Times. Archived from the original on 20 June 2017. Retrieved 14 May 2017. {{cite news}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  43. ^ Price, Rob (17 June 2016). "Digital Currency Ethereum is Cratering Amid Claims of a $50 Million Hack". Business Insider. Business Insider. Archived from the original on 11 June 2017. Retrieved 14 May 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  44. ^ Peck, Morgan (19 July 2016). ""Hard Fork" Coming to Restore Ethereum Funds to Investors of Hacked DAO". IEEE Spectrum: Technology, Engineering, and Science News. IEEE. Archived from the original on 3 March 2017. Retrieved 14 May 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  45. ^ "What is Ethereum? | The Ultimate Beginners' Guide – CoinCentral". coincentral.com. Archived from the original on 11 September 2017. Retrieved 11 September 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  46. ^ Hertig, Alyssa (28 July 2016). "Ethereum's Two Ethereums Explained". CoinDesk. Archived from the original on 24 May 2017. Retrieved 15 May 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  47. ^ Redman, Jamie (14 October 2016). "Ethereum to Hard Fork Two More Times Following Recent Attacks". Bitcoin.com. Bitcoin.com. Archived from the original on 2 November 2016. Retrieved 22 November 2016. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  48. ^ "What Is Ethereum?". weusecoins.com. Retrieved 1 February 2018.
  49. ^ a b c d Popper, Nathaniel (27 March 2016). "Ethereum, a Virtual Currency, Enables Transactions That Rival Bitcoin's". New York Times. Archived from the original on 24 July 2016. Retrieved 2 September 2016. {{cite news}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  50. ^ "Blockchains: The great chain of being sure about things". The Economist. 31 October 2015. Retrieved 18 June 2016. The technology behind bitcoin lets people who do not know or trust each other build a dependable ledger. This has implications far beyond the crypto currency.
  51. ^ Narayanan, Arvind; Bonneau, Joseph; Felten, Edward; Miller, Andrew; Goldfeder, Steven (2016). Bitcoin and Cryptocurrency Technologies: a Comprehensive Introduction. Princeton: Princeton University Press. ISBN 978-0-691-17169-2.
  52. ^ Iansiti, Marco; Lakhani, Karim R. (January 2017). "The Truth About Blockchain". Harvard Business Review. Harvard University. Retrieved 17 January 2017. The technology at the heart of bitcoin and other virtual currencies, blockchain is an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way.
  53. ^ Juchisth, Smith. "Wat is cryptocurrency? Een introductie in de blockchain". Cryptostart (in Dutch). Retrieved 9 December 2017.
  54. ^ "Bitcoin Basics Lesson 2: Essentials of Bitcoin". Medium.com. Retrieved 21 January 2018.
  55. ^ a b Wood, Gavin (3 February 2018). "ETHEREUM: A SECURE DECENTRALISED GENERALISED TRANSACTION LEDGER (EIP-150)". yellowpaper.io. Archived from the original on 3 February 2018. Retrieved 3 February 2018. {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  56. ^ a b c Antonio Madeira (12 January 2018). "Why is Ethereum different to Bitcoin?". CryptoCompare.
  57. ^ Kyle Torpey (28 December 2017). "Will Bitcoin's Lightning Network Kill Off Altcoins Focused On Cheap Transactions?". Forbes.
  58. ^ "Total Ether Supply and Market Capitalization". Etherscan. Retrieved 21 January 2018.
  59. ^ "Evolution of total ether supply". etherchain.org. Retrieved 21 January 2018.
  60. ^ Hertig, Alyssa (18 January 2017). "Where's Casper? Inside Ethereum's Race to Reinvent its Blockchain". CoinDesk. Archived from the original on 27 June 2017. Retrieved 4 July 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  61. ^ Olga Kharif (11 October 2017). "Fans of Digital Currency Ether Can Now Buy ETNs—In Sweden". Bloomberg.
  62. ^ "Store Directory". CoinPayments. Retrieved 26 January 2018.
  63. ^ "What Is Ethereum?—Ethereum Homestead 0.1 documentation". ethdocs.org. Archived from the original on 27 April 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  64. ^ Dannen, Chris (2017). "The EVM". Introducing Ethereum and Solidity: Foundations of Cryptocurrency and Blockchain Programming for Beginners. Apress. pp. 47–67. ISBN 9781484225356.
  65. ^ "What is Ethereum ETH? What is the Ethereum Blockchain?". Ethos. Retrieved 13 November 2018.
  66. ^ Triantafyllidis, Nikolaos Petros (19 February 2016). "The Ethereum Project: Ethereum History". Developing an Ethereum Blockchain Application (Report). University of Amsterdam. p. 20.
  67. ^ "ethernodes.org - The Network number 1". ethernodes.org. Retrieved 1 February 2018.
  68. ^ Dannen, Chris (27 March 2017). "Ethereum Devs Publish Roadmap for EVM Upgrade". CryptoNews. Archived from the original on 25 December 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  69. ^ "Ethereum Client Implementations - EntEthAlliance - Confluence". entethalliance.atlassian.net.
  70. ^ "How Do Ethereum Smart Contracts Work?". CoinDesk.
  71. ^ Rivlin, Brianne (14 November 2016). "Geth, Viper, and Wafr: New Ethereum Developments". ETHNews. Archived from the original on 4 September 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  72. ^ Piasecki, Piotr J. (2016). "Gaming Self-Contained Provably Fair Smart Contract Casinos". Ledger. 1: 99–110. doi:10.5195/ledger.2016.29. Archived from the original on 24 December 2016. {{cite journal}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  73. ^ Peck, M. (28 May 2016). "Ethereum's $150-Million Blockchain-Powered Fund Opens Just as Researchers Call For a Halt". IEEE Spectrum. Institute of Electrical and Electronics Engineers. Archived from the original on 30 May 2016. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  74. ^ "Short Paper: Formal Verification of Smart Contracts" (PDF). microsoft.com/. Microsoft. Archived from the original (PDF) on 27 August 2016. Retrieved 25 August 2016. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  75. ^ "Ethereum vs. Bitcoin" (PDF). Economist. 20 August 2018.
  76. ^ "Bitcoin Vs Ethereum: Driven by Different Purposes". Investopedia. 20 August 2018.
  77. ^ "Litecoin vs. Ethereum". 20 August 2018.
  78. ^ "ETHEREUM IS CODING'S NEW WILD WEST". Wired. 20 August 2018.
  79. ^ Greenspan, Gideon (17 April 2016). "Why Many Smart Contract Use Cases Are Simply Impossible - CoinDesk". CoinDesk. Archived from the original on 7 August 2017. {{cite news}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  80. ^ "This Is Your Company on Blockchain". Bloomberg Businessweek. Archived from the original on 14 September 2016. Retrieved 14 September 2016. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  81. ^ Bordet, Julián (21 March 2016). "Decentralized Autonomous Organizations: Ethereum Sparks Up Googles of Tomorrow". The Cointelegraph. Archived from the original on 27 June 2016. Retrieved 21 July 2016. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  82. ^ "ICO Market Research: The Leading Blockchain Platforms Of 2017 - ICO Watch List Blog". ICO Watch List Blog. 17 August 2017. Archived from the original on 17 August 2017. Retrieved 20 August 2017. {{cite news}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  83. ^ "How Did Ethereum's Price Perform In 2017?". Investopedia. 2 January 2018.
  84. ^ "Big Business Giants From Microsoft to J.P. Morgan Are Getting Behind Ethereum". Fortune. Archived from the original on 29 September 2017. Retrieved 8 November 2017. {{cite news}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  85. ^ "Hyperledger blockchain code almost comes together for IoT". Rethink Research. Archived from the original on 16 August 2016. Retrieved 23 April 2016. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  86. ^ Allison, Ian (3 May 2016). "Deloitte to build Ethereum-based 'digital bank' with New York City's ConsenSys". International Business Times. Archived from the original on 6 May 2016. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  87. ^ Allison, Ian (20 January 2016). "R3 connects 11 banks to distributed ledger using Ethereum and Microsoft Azure". International Business Times. Archived from the original on 23 February 2016. Retrieved 23 February 2016. {{cite news}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  88. ^ "UK Government Awards £248k for Ethereum Prototype". CoinDesk. Archived from the original on 5 June 2016. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  89. ^ "Settlement using blockchain to Automate Foreign Exchange in a Regulated environment (SAFER)". Innovate UK. Archived from the original on 4 May 2016. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  90. ^ "Barclays, UBS, Credit Suisse Seek Ethereum Blockchain Solution For MiFID II Regulations". ETHNews.com. Retrieved 29 December 2017.
  91. ^ "JP Morgan's Quorum blockchain powers new correspondent banking network " Banking Technology". www.bankingtech.com. Archived from the original on 9 November 2017. Retrieved 8 November 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  92. ^ Hacket, Robert. "Why J.P. Morgan Chase Is Building a Blockchain on Ethereum". Fortune. Archived from the original on 2 February 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  93. ^ "Proving Ethereum for the Clearing Use Case" (PDF). Archived from the original (PDF) on 10 October 2016. {{cite news}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  94. ^ Allison, Ian (7 December 2016). "Blockchain: RBS builds Ethereum-based distributed clearing house". IB Times. Archived from the original on 13 April 2017. Retrieved 8 May 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  95. ^ a b c Allison, Ian (25 January 2016). "How are banks actually going to use blockchains and smart contracts?". International Business Times. Archived from the original on 8 May 2016. Retrieved 4 May 2016. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  96. ^ Murphy, Hannah (19 October 2018). "The rise and fall of Ethereum". Financial Times. London: The Financial Times Ltd. Retrieved 19 October 2018.
  97. ^ Filiba, Jack. "Ethereum Breaks One Million Transactions in a Single Day". Archived from the original on 22 December 2017. {{cite web}}: Unknown parameter |dead-url= ignored (|url-status= suggested) (help)
  98. ^ Higgins, Stan. "'Microraiden' Payment Channels Go Live on Ethereum Network". Archived from the original on 22 December 2017. {{cite web}}: Unknown parameter |dead-url= ignored (|url-status= suggested) (help)
  99. ^ a b Hertig, Alyssa (12 August 2017). "Ethereum + Lightning? Buterin and Poon Unveil 'Plasma' Scaling Plan". CoinDesk. Archived from the original on 24 August 2017. Retrieved 23 August 2017. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  100. ^ Galeon, Dom. "Ethereum's Co-Founder Just Unveiled His Plan for the Future of Cryptocurrency". Archived from the original on 9 November 2017. {{cite web}}: Unknown parameter |dead-url= ignored (|url-status= suggested) (help)
  101. ^ Vitalik Buterin. "Merkling in Ethereum". Ethereum.org.
  102. ^ Joon Ian Wong. "The ethereum network is getting jammed up because people are rushing to buy cartoon cats on its blockchain". QZ.com.
  103. ^ a b "Update status EIP-1 according to own specification · ethereum/EIPs@db14da1". GitHub. Retrieved 2 July 2018.
  104. ^ Becze, Martin; Jameson, Hudson. "Ethereum EIP-1 on Github". GitHub. Retrieved 2 July 2018. {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  105. ^ Vitalik, Buterin. "Ethereum EIP-160 EXP cost increase". GitHub. Retrieved 2 July 2018. {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  106. ^ "Ethereum EIP-20:ERC-20 Token Standard". GitHub. Retrieved 2 July 2018. {{cite web}}: Cite has empty unknown parameter: |dead-url= (help)
  107. ^ Kaminska, Izabella (1 June 2017). "It's not a ponzi, it's a smart ponzi". FT Alphaville. Archived from the original on 23 July 2017. {{cite news}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  108. ^ Bartoletti, Carta; et al. "Dissecting Ponzi schemes on Ethereum: identification, analysis, and impact" (PDF). Universita di Cagliari. Archived from the original (PDF) on 17 August 2017. Retrieved 30 July 2017. {{cite journal}}: Cite journal requires |journal= (help); Explicit use of et al. in: |last1= (help); Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
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