|Original author(s)||Vitalik Buterin|
|Developer(s)||Ethereum Foundation, Hyperledger, Nethermind, OpenEthereum, EthereumJS|
|Initial release||30 July 2015|
|Stable release||London / 5 August 2021|
|Software used||EVM 1 Bytecode|
|Written in||Go, Rust, C#, C++, Java, Python|
|Size||991.56 GB (2021-09-30)|
|Available in||Multilingual, but primarily English|
|Active hosts||3,481 nodes (2021-09-30)|
Ethereum is a decentralized, open-source blockchain with smart contract functionality. Ether (ETH or Ξ) is the native cryptocurrency of the platform. Amongst cryptocurrencies, Ether is second only to Bitcoin in market capitalization.
Ethereum was conceived in 2013 by programmer Vitalik Buterin. In 2014, development work commenced and was crowdfunded, and the network went live on 30 July 2015. The platform allows anyone to deploy permanent and immutable decentralized applications onto it, with which users can interact. Decentralized finance (DeFi) applications provide a broad array of financial services without the need for typical financial intermediaries like brokerages, exchanges, or banks, such as allowing cryptocurrency users to borrow against their holdings or lend them out for interest. Ethereum also allows for the creation and exchange of NFTs, which are non-interchangeable tokens connected to digital works of art or other real-world items and sold as unique digital property. Additionally, many other cryptocurrencies operate as ERC-20 tokens on top of the Ethereum blockchain and have utilized the platform for initial coin offerings.
Ethereum was initially described in a white paper by Vitalik Buterin, a programmer and co-founder of Bitcoin Magazine, in late 2013 with a goal of building decentralized applications. Buterin argued to the bitcoin core developers that Bitcoin and blockchain technology could benefit from other applications besides money and needed a more robust language for application development that could lead to attaching real-world assets, such as stocks and property, to the blockchain. In 2013, Buterin briefly worked with eToro CEO Yoni Assia on the Colored Coins project and drafted its white paper outlining additional use cases for blockchain technology. However, after failing to gain agreement on how the project should proceed, he proposed the development of a new platform with a more robust scripting language—a Turing-complete programming language—that would eventually become Ethereum.
Ethereum was announced at the North American Bitcoin Conference in Miami, in January 2014. During the conference, Gavin Wood, Charles Hoskinson, and Anthony Di Iorio (who financed the project) rented a house in Miami with Buterin to develop a fuller sense of what Ethereum might become. Di Iorio invited friend Joseph Lubin, who invited reporter Morgen Peck, to bear witness. Peck subsequently wrote about the experience in Wired. Six months later the founders met again in a house in Zug, Switzerland, where Buterin told the founders that the project would proceed as a non-profit. Hoskinson left the project at that time.
Ethereum has an unusually long list of founders. Anthony Di Iorio wrote: "Ethereum was founded by Vitalik Buterin, Myself, Charles Hoskinson, Mihai Alisie & Amir Chetrit (the initial 5) in December 2013. Joseph Lubin, Gavin Wood, & Jeffrey Wilcke were added in early 2014 as founders." Formal development of the software began in early 2014 through a Swiss company, Ethereum Switzerland GmbH (EthSuisse). The basic idea of putting executable smart contracts in the blockchain needed to be specified before the software could be implemented. This work was done by Gavin Wood, then the chief technology officer, in the Ethereum Yellow Paper that specified the Ethereum Virtual Machine. Subsequently, a Swiss non-profit foundation, the Ethereum Foundation (Stiftung Ethereum), was created as well. Development was funded by an online public crowdsale from July to 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.
Buterin chose the name Ethereum after browsing a list of elements from science fiction on Wikipedia. He stated, "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 [it] sounded nice and it had the word 'ether', referring to the hypothetical invisible medium that permeates the universe and allows light to travel." Buterin wanted his platform to be the underlying and imperceptible medium for the applications running on top of it.
Launch and milestones
|Code name||Release date||Release block|
|Frontier||30 July 2015||0|
|Ice Age||8 September 2015||200,000|
|Homestead||15 March 2016||1,150,000|
|DAO Fork||20 July 2016||1,920,000|
|Tangerine Whistle||18 October 2016||2,463,000|
|Spurious Dragon||23 November 2016||2,675,000|
|Byzantium||16 October 2017||4,370,000|
|Constantinople||28 February 2019||7,280,000|
|St. Petersburg||28 February 2019||7,280,000|
|Istanbul||8 December 2019||9,069,000|
|Muir Glacier||2 January 2020||9,200,000|
|Berlin||15 April 2021||12,244,000|
|London||5 August 2021||12,965,000|
Several codenamed prototypes of Ethereum were developed over 18 months in 2014 and 2015 by the Ethereum Foundation as part of their proof-of-concept series. "Olympic" was the last prototype and public beta pre-release. The Olympic network provided users with a bug bounty of 25,000 Ether for stress testing the limits of the Ethereum blockchain. In July 2015, "Frontier" marked the official launch of the Ethereum platform as Ethereum created its "genesis block."
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. Protocol upgrades are accomplished by means of a hard fork.
There have been two network upgrades in 2021. The first was the "Berlin" upgrade, implemented on 14 April 2021. The second was "London", which took effect on 5 August. The London upgrade included Ethereum Improvement Proposal ("EIP") 1559, which introduced a mechanism for reducing transaction fee volatility. The mechanism causes a portion of the Ether paid in transaction fees each block to be destroyed rather than given to the miner, reducing the inflation rate of Ether and potentially resulting in periods of deflation.
The DAO event
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 exploited in June 2016 when US$50 million of DAO tokens were stolen by an unknown hacker. The event sparked a debate in the crypto-community about whether Ethereum should perform a contentious "hard fork" to reappropriate the affected funds. It resulted in the network splitting into two blockchains: Ethereum with the theft reversed and Ethereum Classic which continued on the original chain. The hard fork created a rivalry between the two networks. After the hard fork, Ethereum subsequently forked twice in the fourth quarter of 2016 to deal with other attacks.
In March 2017, various blockchain startups, research groups, and Fortune 500 companies announced the creation of the Enterprise Ethereum Alliance (EEA) with 30 founding members. By May 2017, 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. By July 2017, there were over 150 members in the alliance, including MasterCard, Cisco Systems, Sberbank, and Scotiabank.
In March 2021, Visa Inc. announced that it began settling stablecoin transactions using Ethereum. In April 2021, JP Morgan Chase, UBS, and MasterCard announced that they were investing $65 million into ConsenSys, a software development firm that builds Ethereum-related infrastructure.
|Code name||Release date||Release block|
|ETH 2.0 Phase 0 (Beacon Chain)||1 December 2020||0|
|ETH 2.0 Phase 1 (planned)||~Q1/Q2 2021||TBD|
|ETH 2.0 Phase 2 (planned)||~2022||TBD|
Open-source development is currently underway for a major upgrade to Ethereum known as Ethereum 2.0 or Eth2. The main purpose of the upgrade is to increase transaction throughput for the network from the current of about 15 transactions per second to up to tens of thousands of transactions per second.
The stated goal is to increase throughput by splitting up the workload into many blockchains running in parallel (referred to as sharding) and then having them all share a common consensus proof-of-stake blockchain, so that to maliciously tamper with any singular chain would require one to tamper with the common consensus, which would cost the attacker far more than they could ever gain from an attack.
Ethereum 2.0 (also known as Serenity) is designed to be launched in three phases:
- "Phase 0" also known as "The Beacon Chain" was launched on 1 December 2020 and created the Beacon Chain, a proof-of-stake (PoS) blockchain that will act as the central coordination and consensus hub of Ethereum 2.0.
- "Phase 1" also known as "The Merge" will merge the Beacon Chain with the current Ethereum network, transitioning its consensus mechanism from proof-of-work to proof-of-stake. As of August 19, 2021, it is expected to be released in the first half of 2022.
- "Phase 2" also known as "Shard chains" will implement state execution in the shard chains with the current Ethereum 1.0 chain expected to become one of the shards of Ethereum 2.0. Shard chains will spread the network's load across 64 new chains. As of August 28, 2021, it is expected to be released in 2022.
Ethereum is a permissionless, non-hierarchical network of computers (nodes) which build and come to consensus on an ever-growing series of "blocks", or batches of transactions, known as the blockchain. Each block contains an identifier of the block that it must immediately follow in the chain if it is to be considered valid. Whenever a node adds a block to its chain, it executes the transactions therein in their order, thereby altering the ETH balances and other storage values of Ethereum accounts. These balances and values, collectively known as the state, are maintained on the node's computer separately from the blockchain, in a Merkle tree.
Each node communicates with a relatively small subset of the network, known as its peers. Whenever a node wishes to include a new transaction in the blockchain, it sends the transaction to its peers, who then send it to their peers, and so on. In this way, it propagates throughout the network. Certain nodes, called miners, maintain a list of all of these new transactions and use them to create new blocks, which they then send to the rest of the network. Whenever a node receives a block, it checks the validity of the block and of all of the transactions therein and, if valid, adds it to its blockchain and executes all of said transactions. As the network is non-hierarchical, a node may receive competing blocks, which may form competing chains. The network comes to consensus on the blockchain by following the "longest-chain rule", which states that the chain with the most blocks at any given time is the canonical chain. This rule achieves consensus because miners do not want to expend their computational work trying to add blocks to a chain that will be abandoned by the network.
Ether (ETH) is the cryptocurrency generated by the Ethereum protocol as a reward to miners in a proof-of-work system for adding blocks to the blockchain. It is the only currency accepted in the payment of transaction fees, which also go to miners. The block reward together with the transaction fees provide the incentive to miners to keep the blockchain growing (i.e. to keep processing new transactions). Therefore, ETH is fundamental to the operation of the network. Each Ethereum account has an ETH balance and may send ETH to any other account. The smallest subunit of ETH is known as a Wei and is equal to 10−18 ETH. Ether is often erroneously referred to as "Ethereum".
There are two types of accounts on Ethereum: user accounts (also known as externally-owned accounts) and contracts. Both types have an ETH balance, may send ETH to any account, may call any public function of a contract or create a new contract, and are identified on the blockchain and in the state by their address.
User accounts are the only type which may create transactions. For a transaction to be valid, it must be signed using the sending account's private key, a 64-character hexadecimal string that should only be known to the account's owner. The signature algorithm used is ECDSA. Importantly, this algorithm allows one to derive the signer's address from the signature without knowing the private key.
Contracts are the only type of account which has associated code (a set of functions and variable declarations) and contract storage (the values of the variables at any given time). A contract function may take arguments and may have return values. Within the body of a function, in addition to control flow statements, a contract's code may include instructions to send ETH, read from and write to its storage, create temporary storage (memory) that dies at the end of the function, perform arithmetic and hashing operations, call its own functions, call public functions of other contracts, create new contracts, and query information about the current transaction or the blockchain.
Ethereum addresses are composed of the prefix "0x", a common identifier for hexadecimal, concatenated with the rightmost 20 bytes of the Keccak-256 hash of the ECDSA public key (the curve used is the so-called secp256k1). In hexadecimal, two digits represent a byte, meaning addresses contain 40 hexadecimal digits, e.g. 0xb794f5ea0ba39494ce839613fffba74279579268. Contract addresses are in the same format, however, they are determined by sender and creation transaction nonce.
Gas is a unit of account within the EVM used in the calculation of a transaction fee, which is the amount of ETH a transaction's sender must pay to the miner who includes the transaction in the blockchain.
Each type of operation which may be performed by the EVM is hardcoded with a certain gas cost, which is intended to be roughly proportional to the amount of resources (computation and storage) a node must expend to perform that operation. When creating a transaction, the sender must specify a gas limit and gas price. The gas limit is the maximum amount of gas the sender is willing to use in the transaction, and the gas price is the amount of ETH the sender wishes to pay to the miner per unit of gas used. The higher the gas price, the more incentive a miner has to include the transaction in their block, and thus the quicker the transaction will be included in the blockchain. The sender buys the full amount of gas (i.e. the gas limit) up-front, at the start of the execution of the transaction, and is refunded at the end for any gas not used. If at any point the transaction does not have enough gas to perform the next operation, the transaction is reverted but the sender still pays for the gas used. Gas prices are typically denominated in Gwei, a subunit of ETH equal to 10−9 ETH.
This fee mechanism is designed to mitigate transaction spam, prevent infinite loops during contract execution, and provide for a market-based allocation of network resources.
Our governance is inherently social, people who are more connected in the community have more power, a kind of soft power.
Vlad Zamfir, Ethereum core developer, The New Yorker
In October 2015, a development governance was proposed as the Ethereum Improvement Proposal (EIP), standardized on EIP-1. The core development group and community were to gain consensus by a process regulated EIP.
The difficulty bomb is an Ethereum protocol feature that causes the difficulty of mining a block to increase exponentially over time after a certain block is reached, with the intended purpose being to incentivize upgrades to the protocol and prevent miners from having too much control over upgrades. As the protocol is upgraded, the difficulty bomb is typically pushed further out in time. The protocol has included a difficulty bomb from the beginning, and the bomb has been pushed back several times. It was originally placed there primarily to ensure a successful upgrade from proof of work to proof of stake, an upgrade which removes miners entirely from the design of the network. The period during which the mining difficulty is increasing is known as the "Ice Age".
Comparison to Bitcoin
Bitcoin's primary use case is that it is a store of value and a digital currency. Ether can also be used as a digital currency and store of value, but the Ethereum network makes it also possible to create and run decentralized applications and smart contracts. Ethereum blocks are validated approximately every 12 seconds on Ethereum as opposed to approximately every 10 minutes on Bitcoin. Additionally, Bitcoin has a fixed supply of 21,000,000 coins, whereas Ethereum has no supply cap. Ethereum and Bitcoin are both mined through proof-of-work and can be purchased on cryptocurrency exchanges.
The EVM's instruction set is Turing-complete. Popular uses of Ethereum have included the creation of fungible (ERC20) and non-fungible (ERC721) tokens with a variety of properties, crowdfunding (e.g. initial coin offerings), decentralized finance, decentralized exchanges, decentralized autonomous organizations (DAOs), games, prediction markets, and gambling.
Contract source code
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 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.
The ERC-20 (Ethereum Request for Comments 20) Token Standard allows for fungible tokens on the Ethereum blockchain. The standard, proposed by Fabian Vogelsteller in November 2015, implements an API for tokens within smart contracts. The standard provides functions including the transfer of tokens from one account to another, getting the current token balance of an account and getting the total supply of the token available on the network. Smart contracts that correctly implement ERC-20 processes are called ERC-20 Token Contracts, and help keep track of the created tokens on Ethereum. Numerous cryptocurrencies have launched as ERC-20 tokens and have been distributed through initial coin offerings. Fees to send ERC-20 tokens must be paid with Ether.
Non-fungible Tokens (NFTs)
Ethereum also allows for the creation of unique and indivisible tokens, called non-fungible tokens (NFTs). Since tokens of this type are unique, they have been used to represent such things as collectibles, digital art, sports memorabilia, virtual real estate, and items within games. The first NFT project, Etheria, a 3D map of tradable and customizable hexagonal tiles, was deployed to the network in October 2015 and demonstrated live at DEVCON1 in November of that year. In 2021, Christie's sold a digital image with an NFT by Beeple for $69.3 million, making him the third-most valuable living artist in terms of auction prices at the time. Land, buildings and avatars in blockchain-based virtual worlds can also be bought and sold as NFTs, sometimes for hundreds of thousands of dollars.
Decentralized finance (DeFi) is a use case of Ethereum. It offers traditional financial instruments in a decentralized architecture, outside of companies' and governments' control, such as money market funds which let users earn interest. Decentralized finance applications are typically accessed through a Web3-enabled browser extension or application, such as MetaMask, which allows users to directly interact with the Ethereum blockchain through a website. Many of these DApps can connect and work together to create complex financial services.
Examples of DeFi platforms include MakerDAO and Compound. Uniswap, a decentralized exchange for tokens on Ethereum grew from $20 million in liquidity to $2.9 billion in 2020. As of October 2020, over $11 billion was invested in various DeFi protocols. Additionally, through a process called "wrapping", certain DeFi protocols allow synthetic versions of various assets (such as Bitcoin, gold and oil) to become available and tradeable on Ethereum and also compatible with all of Ethereum's major wallets and applications.
Ethereum-based software and networks, independent from the public Ethereum chain, are being tested by enterprise software companies. Interested parties include Microsoft, IBM, JPMorgan Chase, Deloitte, R3, and Innovate UK (cross-border payments prototype). Barclays, UBS, Credit Suisse, Amazon, Visa, and other companies are also experimenting with Ethereum.
Ethereum-based permissioned blockchain variants are used and being investigated for various projects.
- In 2017, JPMorgan Chase proposed developing JPM Coin on a permissioned-variant of Ethereum blockchain dubbed "Quorum". It 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."
- The 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.
In Ethereum, all smart contracts are stored publicly on every node of the blockchain, which has costs. Being a blockchain means it is secure by design[clarification needed] 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. As of January 2016, the Ethereum protocol could process about 25 transactions per second. In comparison, the Visa payment platform processes 45,000 payments per second leading some to question the scalability of Ethereum. On 19 December 2016, Ethereum exceeded one million transactions in a single day for the first time. Visa has also signaled interest in processing NFT and Ethereum transactions.
Ethereum's blockchain uses Merkle trees, for security reasons, to improve scalability, and to optimize transaction hashing. As with any Merkle tree implementation, it allows for storage savings, set membership proofs (called "Merkle proofs"), and light client synchronization. The network has faced congestion problems, such as in 2017 in relation to Cryptokitties.
- "Ethereum Chain Full Sync Data Size". YCharts. 30 September 2021. Retrieved 30 September 2021.
- Szalay, Eva; Venkataramakrishnan, Siddharth (28 May 2021). "What are cryptocurrencies and stablecoins and how do they work?". Financial Times. Archived from the original on 14 August 2021. Retrieved 14 August 2021.
- Vigna, Paul (3 June 2021). "DeFi Is Helping to Fuel the Crypto Market Boom—and Its Recent Volatility". The Wall Street Journal. Archived from the original on 13 August 2021. Retrieved 14 August 2021.
- Tapscott & Tapscott 2016, pp. 87.
- Foundation, Ethereum (30 July 2015). "Ethereum Launches". blog.ethereum.org. Archived from the original on 11 August 2015. Retrieved 9 January 2020.
- Popper, Nathaniel (19 June 2017). "Move Over, Bitcoin. Ether Is the Digital Currency of the Moment. (Published 2017)". The New York Times. Archived from the original on 8 July 2020. Retrieved 18 November 2020.
- "Vapor No More: Ethereum Has Launched". TechCrunch. Archived from the original on 13 November 2020. Retrieved 17 February 2021.
- Vigna, Paul (3 May 2021). "Ethereum Is Booming in the NFT Frenzy—So Is Network Congestion". The Wall Street Journal. ISSN 0099-9660. Archived from the original on 9 May 2021. Retrieved 5 May 2021.
- "There are two very real reasons Ethereum is taking off". Fortune. 6 May 2021. Archived from the original on 10 May 2021. Retrieved 5 August 2021.
- "Ethereum 2.0 Specifications". Github. Archived from the original on 2 June 2020. Retrieved 1 June 2020.
- del Castillo, Michael. "Ethereum Cofounder Joe Lubin Talks Trump, Blockchain's 'Frankenstein' And Willingness To Work With China". Forbes. Archived from the original on 22 June 2020. Retrieved 1 June 2020.
- "White Paper· ethereum/wiki Wiki · GitHub". Archived from the original on 11 January 2014.
- 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.
- 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.
- Russo, Camila (14 July 2020). The infinite machine : how an army of crypto-hackers is building the next internet with Ethereum (First ed.). New York, NY. pp. 40–44. ISBN 9780062886149.
- Russo 2020, pp. 44.
- Tapscott & Tapscott 2016, pp. 278.
- Tapscott, Don; Tapscott, Alex (2016). The Blockchain Revolution: How the Technology Behind Bitcoin is Changing Money, Business, and the World. Portfolio. ISBN 978-0670069972.
- Paumgarten, Nick (22 October 2018). "The Prophets of Cryptocurrency Survey the Boom and Bust". The New Yorker. Archived from the original on 9 January 2020. Retrieved 4 February 2019.
- "The Uncanny Mind That Built Ethereum". Wired. ISSN 1059-1028. Archived from the original on 13 July 2017. Retrieved 4 May 2021.
- Jain, Aman (17 August 2021). "Founders' Fork: The Ethereum Architects Now Locked in Battle". Entrepreneur. Archived from the original on 18 August 2021. Retrieved 19 August 2021.
- "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.
- Dannen, Chris (16 March 2017). Introducing Ethereum and Solidity: Foundations of Cryptocurrency and Blockchain Programming for Beginners. Apress. p. 30. ISBN 978-1484225356. Archived from the original on 23 August 2021. Retrieved 12 November 2018.
- Wood, Gavin (3 February 2018). "Ethereum: A Secure Decentralized Generalised Transaction Ledger (EIP-150)". yellowpaper.io. Archived from the original on 3 February 2018. Retrieved 3 February 2018.
- Shen, Lucinda (8 January 2018). "Ethereum Regains Title as Second Most Valuable Cryptocurrency Behind Bitcoin". Fortune. Fortune Media IP Limited. Archived from the original on 8 January 2018. Retrieved 26 December 2020.
- Ransom, Jan (2 December 2019). "He Gave a Cryptocurrency Talk in North Korea. The U.S. Arrested Him". The New York Times. Archived from the original on 22 November 2020. Retrieved 12 January 2021.
- Mehrotra, Kartikay (28 August 2021). "Most Used Blockchain Averts Crisis After Software Flaw Is Fixed". Bloomberg. Retrieved 28 August 2021.
- Russo 2020, pp. 56.
- 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.
- "Archived copy". Ethereum.org. 28 February 2019. Archived from the original on 30 May 2021. Retrieved 5 August 2021.CS1 maint: archived copy as title (link)
- Foundation, Ethereum. "Ethereum Constantinople/St. Petersburg Upgrade Announcement". blog.ethereum.org. Retrieved 29 September 2021.
- Muir Glacier: Ethereum Hard Forks for Second Time in One Month Archived 5 August 2021 at the Wayback Machine, Blockchain News, retrieved 5 August 2021.
- "Ether rallies to all-time high above $2,200 ahead of Coinbase listing, Berlin hard fork". markets.businessinsider.com. 13 April 2021. Archived from the original on 18 April 2021. Retrieved 18 April 2021.
- Sigalos, MacKenzie (5 August 2021). "Ethereum just activated its 'London' hard fork, and it's a really big deal". CNBC. Archived from the original on 5 August 2021. Retrieved 5 August 2021.
- Gupta, Vinay (3 March 2015). "The Ethereum Launch Process". Ethereum Foundation. Archived from the original on 6 June 2017. Retrieved 5 June 2017.
- Bashir, Imran (2020). Mastering Blockchain – Third Edition : a deep dive into distributed ledgers, consensus protocols,... smart contracts, dapps, cryptocurrencies, ethereum. [S.l.]: Packt Publishing Limited. p. 312. ISBN 978-1839213199.
- "Crypto Coin Outperforming Bitcoin Is About to See Supply Reduced". Bloomberg.com. 7 March 2021. Archived from the original on 18 April 2021. Retrieved 18 April 2021.
- Vigna, Paul (16 May 2016). "Chiefless Company Rakes in More than $100 Million". The Wall Street Journal. Archived from the original on 25 June 2017. Retrieved 14 May 2017.
- 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.
- 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.
- 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.
- Leising, Matthew (13 June 2017). "The Ether Thief". www.bloomberg.com. Archived from the original on 26 December 2018. Retrieved 21 December 2018.
- Popper, Nathaniel (27 February 2017). "Business Giants to Announce Creation of a Computing System Based on Ethereum". The New York Times. Archived from the original on 20 June 2017. Retrieved 5 June 2017.
- 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.
- "Enterprise Ethereum Alliance expands dramatically announcing 86 new members" (PDF) (Press release). Enterprise Ethereum Alliance (EEA). 19 May 2017. Archived (PDF) from the original on 7 June 2017. Retrieved 5 June 2017.
- "The Enterprise Ethereum Alliance Just Got A Whole Lot Stronger". 19 July 2017. Archived from the original on 21 May 2018. Retrieved 31 July 2017.
- "Sberbank joins Enterprise Ethereum Alliance to broaden cooperation" Archived 26 December 2017 at the Wayback Machine(19 October 2017). Fintech Futures News. Retrieved 6 June 2018.
- Hackett, Robert (29 March 2021). "That settles it: Visa is making life way easier for crypto businesses". Fortune. Archived from the original on 5 May 2021. Retrieved 5 August 2021.
- Morris, David Z. (13 April 2021). "Ethereum: Mastercard, UBS, and J.P. Morgan pour $65 million into crypto startup studio Consensys". Fortune. Archived from the original on 30 April 2021. Retrieved 5 August 2021.
- "The merge | etherium.org". ethereum.org. 19 August 2021. Retrieved 29 September 2021.
- "Shard chains | etherium.org". ethereum.org. 28 August 2021. Retrieved 29 September 2021.
- Dillet, Romain. "Justin Drake from the Ethereum Foundation is coming to Disrupt Berlin". TechCrunch. Archived from the original on 6 August 2020. Retrieved 18 August 2020.
- Roberts, Jeff (19 February 2019). "Ethereum, Bitcoin's closest rival, faces its moment of truth". Fortune. Fortune Media IP Limited. Archived from the original on 4 May 2021. Retrieved 5 August 2021.
- "Ethereum Upgrade Adds to Crypto Mania Sparked by Bitcoin's Surge". Bloomberg.com. 25 November 2020. Archived from the original on 28 November 2020. Retrieved 28 November 2020.
- "Ethereum Becoming More Than Crypto Coder Darling, Grayscale Says". Bloomberg.com. 4 December 2020. Archived from the original on 4 December 2020. Retrieved 6 December 2020.
- Browne, Ryan (1 December 2020). "The world's second-biggest cryptocurrency is getting a major upgrade — here's what you need to know". CNBC. Archived from the original on 6 December 2020. Retrieved 6 December 2020.
- "The Beacon Chain". ethereum.org. Retrieved 29 September 2021.
- ethereum/annotated-spec, ethereum, 11 October 2021, retrieved 11 October 2021
- Popper, Nathaniel (27 March 2016). "Ethereum, a Virtual Currency, Enables Transactions That Rival Bitcoin's". The New York Times. Archived from the original on 24 July 2016. Retrieved 2 September 2016.
- Chavez-Dreyfuss, Gertrude (5 February 2021). "Ether seeks to escape bitcoin's shadow with CME futures launch". Reuters. Archived from the original on 5 August 2021. Retrieved 8 February 2021.
- Varshney, Neer (11 June 2018). "Ethereum's supply has crossed 100M, here's what that means". Hard Fork | The Next Web. Archived from the original on 25 May 2019. Retrieved 25 May 2019.
- "Account Types, Gas, and Transactions". EthDocs.org. Archived from the original on 24 February 2021. Retrieved 19 January 2021.
- "Introduction to Smart Contracts". SolidityLang.org. Archived from the original on 27 January 2021. Retrieved 19 January 2021.
- Triantafyllidis, Nikolaos Petros (19 February 2016). "The Ethereum Project: Ethereum History". Developing an Ethereum Blockchain Application (Report). University of Amsterdam. p. 20.
- de Azevedo Sousa, José Eduardo (2020). "An analysis of the fees and pending time correlation in Ethereum" (PDF). International Journal of Network Management (e2113). Archived (PDF) from the original on 9 July 2020. Retrieved 14 October 2020.
- "Update status EIP-1 according to own specification · ethereum/EIPs@db14da1". GitHub. Archived from the original on 5 August 2021. Retrieved 2 July 2018.
- Becze, Martin; Jameson, Hudson. "Ethereum EIP-1 on Github". GitHub. Archived from the original on 12 July 2018. Retrieved 2 July 2018.
- Antonopoulos, Andreas M.; Wood, Gavin (2018). Mastering Ethereum : building smart contracts and DApps (First ed.). Sebastopol, CA: O'Reilly Media, Inc. p. xxvii. ISBN 978-1491971949.
- Benahmed, Daho (August 2020). "Crypto-Spatial AN Open Standards Smart Contracts Library for Building Geospatially Enabled Decentralized Applications on the Ethereum Blockchain". ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. XLIII-B4-2020: 421–426. Bibcode:2020ISPAr43B4..421B. doi:10.5194/isprs-archives-XLIII-B4-2020-421-2020.
- Kharif, Olga (18 January 2019). "Ethereum's Split Pushed Back Until After Valentine's Day". Bloomberg. Archived from the original on 15 February 2020. Retrieved 16 February 2020.
- Anneken Tappe. "Bitcoin? Ethereum? Dogecoin? Your guide to the biggest names in crypto". CNN. Archived from the original on 22 April 2021. Retrieved 22 April 2021.
- Popper, Nathaniel (1 October 2017). "Understanding Ethereum, Bitcoin's Virtual Cousin (Published 2017)". The New York Times. Archived from the original on 10 February 2021. Retrieved 23 October 2020.
- 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.
- "Short Paper: Formal Verification of Smart Contracts" (PDF). microsoft.com/. Microsoft. Archived from the original (PDF) on 27 August 2016. Retrieved 25 August 2016.
- "ERC-20 Token Standard". Ethereum.org. 7 December 2020. Archived from the original on 19 March 2021. Retrieved 23 March 2021.
- Castillo, Michael del. "Ethereum's First ICO Blazes Trail To A World Without Bosses". Forbes. Archived from the original on 5 August 2021. Retrieved 29 December 2020.
- Volpicelli, Gian (24 February 2021). "The bitcoin elite are spending millions on collectable memes". Wired UK. Archived from the original on 5 August 2021. Retrieved 25 February 2021.
- Browne, Ryan (25 February 2021). "Why people are buying crypto art and sports memorabilia for thousands of dollars". CNBC. Archived from the original on 25 February 2021. Retrieved 25 February 2021.
- "The Cult of CryptoPunks". TechCrunch. Archived from the original on 6 May 2021. Retrieved 10 July 2021.
- "Christie's gets digital with the art world's non-fungible craze". www.ft.com. Archived from the original on 23 February 2021. Retrieved 25 February 2021.
- Ostroff, Kelly Crow and Caitlin (11 March 2021). "Beeple NFT Fetches Record-Breaking $69 Million in Christie's Sale". The Wall Street Journal. Archived from the original on 12 March 2021. Retrieved 12 March 2021.
- "The 'metaverse' bet: crypto-rich investors snap up virtual real estate". Reuters. 19 April 2021. Archived from the original on 20 April 2021. Retrieved 20 April 2021.
- Schroeder, Stan. "DeFi could become the next big thing in finance". Mashable. Archived from the original on 25 July 2020. Retrieved 25 July 2020.
- Kauflin, Jeff. "Why Everyone in Crypto Is Talking About DeFi". Forbes. Archived from the original on 31 July 2020. Retrieved 25 July 2020.
- Schroeder, Stan. "Crypto wallet MetaMask finally launches on iOS and Android, and it supports Apple Pay". Mashable. Archived from the original on 5 August 2021. Retrieved 19 April 2021.
- "MetaMask's Blockchain Mobile App Opens Doors For Next-Level Web". Bloomberg.com. 2 September 2020. Retrieved 19 April 2021.
- "Why 'DeFi' Utopia Would Be Finance Without Financiers: QuickTake". Bloomberg. 26 August 2020. Archived from the original on 15 October 2020. Retrieved 6 October 2020.
- "Crypto soars again as traders embrace 'DeFi' and 'yield farming'—but some see echoes of the 2017 bubble". Fortune. 25 August 2020. Archived from the original on 25 May 2021. Retrieved 11 May 2021.
- Konrad, Alex. "These Young Investors Are Still Betting Big On Crypto – And Are Taking Harvard And Stanford Along For The Ride". Forbes. Archived from the original on 20 October 2020. Retrieved 21 October 2020.
- Ehrlich, Steven. "Leading 'Privacy Coin' Zcash Poised For Growth Following Placement On Ethereum". Forbes. Archived from the original on 3 May 2021. Retrieved 2 November 2020.
- "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.
- "Settlement using blockchain to Automate Foreign Exchange in a Regulated environment (SAFER)". Innovate UK. Archived from the original on 4 May 2016.
- Castillo, Michael del. "Blockchain 50". Forbes. Archived from the original on 5 August 2021. Retrieved 4 December 2020.
- "Beyond Bitcoin: These Cryptocurrencies Are Doing Even Better". Bloomberg.com. 3 December 2020. Archived from the original on 4 December 2020. Retrieved 4 December 2020.
- "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.
- Hackett, Robert (4 October 2016). "Why J.P. Morgan Chase Is Building a Blockchain on Ethereum". Fortune. Archived from the original on 2 February 2017.
- Murphy, Hannah (19 October 2018). "The rise and fall of Ethereum". Financial Times. London: The Financial Times Ltd. Archived from the original on 19 October 2018. Retrieved 19 October 2018.
- Filiba, Jack. "Ethereum Breaks One Million Transactions in a Single Day". Archived from the original on 22 December 2017.
- DeCambre, Mark. "Why did Visa just buy a 'CryptoPunk' NFT for $150,000? The payments giant wants 'a seat at the table as the crypto economy evolves'". MarketWatch. Retrieved 3 September 2021.
- Galeon, Dom. "Ethereum's Co-Founder Just Unveiled His Plan for the Future of Cryptocurrency". Archived from the original on 9 November 2017.
- Vitalik Buterin. "Merkling in Ethereum". Ethereum.org. Archived from the original on 8 December 2017. Retrieved 12 January 2018.
- Joon Ian Wong. "The Ethereum network is getting jammed up because people are rushing to buy cartoon cats on its blockchain". QZ.com. Archived from the original on 5 August 2021. Retrieved 15 July 2018.
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