Open-source blockchain computing platform

Ethereum

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The Ethereum network is a decentralized blockchain platform that stands as a foundational layer for a new generation of digital applications and financial systems. It distinguishes itself not merely as a digital currency, but as a robust, programmable infrastructure that allows for the creation and execution of complex smart contracts . The native cryptocurrency of this expansive ecosystem is Ether, commonly abbreviated as ETH (though, for the record, it lacks a formal ISO 4217 alpha-3 code; “ETH” is purely informal, which seems fitting for something that defies conventional categorization [a] ). In the volatile yet captivating world of digital assets, Ether consistently holds the second position in terms of market capitalization , trailing only its venerable predecessor, bitcoin . [3] [4]

This intricate system is built upon principles of transparency and community contribution, manifested as entirely open-source software . The initial spark for Ethereum came in 2013 from the mind of Vitalik Buterin , a programmer whose vision extended beyond the singular monetary focus of existing blockchain technologies. [5] His ambition quickly attracted a constellation of other notable figures who would become co-founders, including Gavin Wood , Charles Hoskinson , Anthony Di Iorio , and Joseph Lubin . [6] Following this conceptual phase, tangible development commenced in 2014, buoyed by a successful crowdfunding campaign. The network officially sprang to life on 30 July 2015, marking the dawn of a new era in decentralized computing. [7]

Ethereum’s fundamental utility lies in its permissionless nature: it empowers anyone to deploy their own decentralized applications (dApps) onto its network, making them accessible to a global user base without the need for central authorities. [8] This capability has blossomed into entire sectors, most notably Decentralized Finance (DeFi). DeFi applications aim to replicate traditional financial instruments without the direct involvement of conventional financial intermediaries such as brokerages , major exchanges , or established banks . The allure is clear: users can, for example, borrow funds by collateralizing their existing cryptocurrency holdings or lend out their assets to earn interest , all within a transparent and ostensibly trustless framework. [9] [10] Beyond financial instruments, Ethereum also provides the technical bedrock for creating both fungible tokens—such as those adhering to the ERC-20 standard, which are interchangeable like traditional currency—and the now ubiquitous non-fungible tokens (NFTs), each possessing unique digital characteristics. These tokens, alongside the smart contracts that govern them, can receive, hold, and send assets strictly in accordance with their immutable, pre-programmed code and the specific input data of a given transaction.

A monumental shift in Ethereum’s operational philosophy occurred on 15 September 2022, with an upgrade famously dubbed “The Merge.” This transition fundamentally altered the network’s consensus mechanism , moving from the energy-intensive proof-of-work (PoW) model to a more environmentally conscious proof-of-stake (PoS) system. The immediate, verifiable impact was a dramatic reduction in the blockchain’s energy consumption, reported to be over 99%. [11] [12] A commendable feat, if one chooses to ignore the broader implications for energy consumption as displaced miners simply shift their operations elsewhere, a problem that tends to follow humanity like a shadow.

History

Founding (2013–2014)

The genesis of Ethereum can be traced back to late 2013, when Vitalik Buterin , a precocious programmer and co-founder of Bitcoin Magazine , articulated his groundbreaking vision in a concise white paper . [5] [13] This document laid out a novel framework for constructing decentralized applications, moving beyond the limited scope of Bitcoin’s transactional capabilities. [14] [15] Buterin, with a clarity that often eludes seasoned industry veterans, posited to the existing Bitcoin Core developers that blockchain technology possessed far greater potential than simply facilitating digital money. He argued vehemently for a more expressive and robust language for application development [16] : 88 —a language that could potentially bridge the gap between digital assets and real-world assets , enabling the representation of things like stocks and physical property directly on a blockchain. [17]

Earlier in 2013, Buterin had briefly collaborated with eToro CEO Yoni Assia on the Colored Coins project. During this engagement, he drafted a white paper exploring additional applications for blockchain technology. [18] However, a lack of consensus on the future direction of that project led him to propose a radical departure: the development of an entirely new platform. This platform would feature a far more powerful scripting language, specifically a Turing-complete programming language [19]—a system capable of simulating any computer algorithm—which would eventually evolve into the Ethereum we know today. [16] The ambition was clear: to create a universal computer, distributed across the globe.

The formal public unveiling of Ethereum took place at the North American Bitcoin Conference in Miami in January 2014. [20] It wasn’t just a presentation; it was a convergence. During this pivotal conference, Gavin Wood , Charles Hoskinson , and Anthony Di Iorio , the latter of whom provided crucial initial financing for the nascent project, joined Buterin in a rented house in Miami. This informal setting became a crucible where they collectively fleshed out the intricate details and expansive possibilities of what Ethereum could truly become. [20] Di Iorio, understanding the historical weight of their endeavor, extended an invitation to his friend Joseph Lubin , who in turn invited reporter Morgen Peck. Peck’s presence was intended to bear witness to this formative period, offering an external, journalistic perspective. [20] Her subsequent account of the experience, published in Wired , provided an early, influential glimpse into the project’s foundational moments. [21]

A mere six months later, the founders reconvened in Zug , Switzerland, a locale that would become synonymous with blockchain innovation. It was there that Buterin delivered a defining announcement: the project would proceed as a non-profit entity. This decision proved to be a point of divergence, leading to Hoskinson’s departure from the project shortly thereafter. Hoskinson would go on to found IOHK, a prominent blockchain company known for its work on Cardano , a direct competitor to Ethereum. [20] Such is the nature of ambition; paths diverge, and new empires rise.

Ethereum is notable for its rather extensive roster of founders, a testament to the collaborative, yet sometimes fragmented, nature of its early formation. [22] As Anthony Di Iorio himself documented: “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.” The very name “Ethereum” was chosen by Buterin after a rather mundane browsing session through a list of elements from science fiction on Wikipedia . He recounted, “I immediately realized that I liked it better than all of the other alternatives that I had seen; I suppose it was 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.” [20] This choice was deliberate; Buterin envisioned his platform as precisely that: an underlying, pervasive, and largely imperceptible medium, much like the classical concept of the luminiferous aether, through which all subsequent applications would seamlessly operate. [23] A rather poetic ambition for a technical infrastructure.

Development (2014)

The formal engineering phase for Ethereum’s underlying software commenced in early 2014. This crucial stage was spearheaded by Ethereum Switzerland GmbH (EthSuisse), a company based in Switzerland. [24] Before the intricate vision of executable smart contracts could be translated into functional code and embedded within the blockchain, a rigorous theoretical specification was essential. This foundational work fell primarily to Gavin Wood , who served as the project’s initial chief technology officer . Wood’s efforts culminated in the creation of the Ethereum Yellow Paper, a comprehensive technical document that meticulously detailed the specifications for the Ethereum Virtual Machine (EVM), effectively laying out the architectural blueprint for the entire platform. [25] [26]

Following these initial corporate and technical foundations, a Swiss non-profit entity, the Ethereum Foundation (Stiftung Ethereum), was established to guide the project’s long-term development and ensure its decentralized ethos. Funding for this ambitious undertaking was secured through an innovative online public crowd sale, conducted between July and August 2014. During this period, early adopters and enthusiasts purchased Ethereum’s native value token, ether, using bitcoin as the primary medium of exchange. While the technical innovations proposed by Ethereum garnered considerable early acclaim, the nascent project was not without its critics. Concerns were immediately raised regarding the platform’s potential for robust security and its capacity to scale effectively, challenges that continue to plague distributed systems. [14]

To mitigate risks and foster diverse development, the Ethereum Foundation strategically funded multiple independent teams operating from various global locations. These teams were tasked with building distinct implementations of the Ethereum protocol. Notable among these were Geth, developed in Go ; Pyethereum, written in Python ; and a third implementation in C++ . Beyond the core protocol, the Foundation also supported ancillary projects such as Swarm, designed for decentralized file storage , and the Mist Browser, which aimed to serve as a comprehensive wallet, browser , and user interface for interacting with smart contracts (though it has since been deprecated). The rationale behind commissioning three separate core implementations was a pragmatic one: to provide a robust system of checks and balances. If a significant bug were to emerge in one implementation, the other two could serve as a comparative baseline, aiding in identification and rectification, a sensible redundancy for a system upon which so much was expected to be built.

Launch and the DAO event (2014–2016)

The path to Ethereum’s public debut was paved with iterative development, spanning an intensive 18-month period from 2014 to 2015. During this time, the Ethereum Foundation meticulously crafted and refined several codenamed prototypes, each serving as a proof-of-concept in a carefully orchestrated series. [5] The final and most extensive of these pre-release versions was “Olympic,” which functioned as a public beta. To rigorously stress-test the burgeoning Ethereum blockchain, the Olympic network offered a substantial bug bounty of 25,000 ether to users who could identify and exploit vulnerabilities. It was a bold move, effectively pitting the community against the system, and it paid off.

Finally, on 30 July 2015, the “Frontier” release marked the official, production-ready launch of the Ethereum platform. This pivotal moment saw the creation of Ethereum’s “genesis block,” the very first block in its blockchain, forever anchoring its existence. [5] [27] This foundational block was not empty; it contained 8,893 initial transactions, meticulously allocating various amounts of ether to a diverse set of addresses, and notably included a block reward of 5 ETH.

Since that initial launch, Ethereum has been in a continuous state of evolution, marked by a series of meticulously planned protocol upgrades. These are not mere cosmetic changes but rather substantial alterations designed to enhance the platform’s underlying functionality, improve its efficiency, or adjust its incentive structures . [28] [29] Such significant protocol changes are typically implemented through a process known as a hard fork , a contentious but necessary mechanism that effectively creates a divergence in the blockchain’s history.

The year 2016 brought both unprecedented success and profound crisis. A novel entity known as The DAO —a decentralized autonomous organization implemented as a complex set of smart contracts directly on the Ethereum platform—captured global attention. It successfully raised a staggering US$150 million through a crowd sale to fund its ambitious decentralized investment project, a record at the time. [30] However, warning signs were already present. Academics and researchers, including Emin Gün Sirer , Vlad Zamfir, and Dino Mark, had published a prescient paper titled “A Call for a Temporary Moratorium on The DAO,” meticulously outlining the potential vulnerabilities that could expose The DAO to malicious attacks. [31]

Their warnings proved tragically accurate. In June 2016, The DAO was indeed exploited, resulting in the theft of approximately US$50 million worth of DAO tokens by an unidentified hacker. [32] [33] This incident sent shockwaves through the nascent crypto-community, igniting an intense and deeply divisive debate: should the Ethereum network intervene with another, highly controversial “hard fork” to reverse the theft and restore the stolen funds? [34] The philosophical implications were immense, pitting the immutability of the blockchain against the desire for justice and user protection. Ultimately, the community, after much deliberation, chose intervention. This contentious decision led to a permanent split in the network, birthing two distinct blockchains: the “new” Ethereum, where the theft was effectively reversed, and Ethereum Classic , which steadfastly continued on the original, unaltered chain, upholding the principle that “code is law,” regardless of the consequences. [35] A painful lesson learned, etched into the very fabric of the network.

Continued development and milestones (2017–present)

The aftermath of The DAO incident, rather than crippling Ethereum, seemed to galvanize its institutional adoption. In March 2017, a significant turning point arrived with the announcement of the Enterprise Ethereum Alliance (EEA). This ambitious initiative brought together a formidable consortium of diverse entities, including various blockchain startups, prominent research groups, and a host of Fortune 500 companies, starting with 30 founding members. [36] The sheer breadth of corporate interest was undeniable.

By May 2017, the EEA had swelled to an impressive 116 enterprise members, a clear signal of Ethereum’s growing credibility within traditional business circles. This roster included industry titans such as 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 the National Bank of Canada . [37] [38] The momentum continued unabated, and by July 2017, the alliance boasted over 150 members, further expanding its reach to include powerhouses like MasterCard , Cisco Systems , Sberbank , and Scotiabank . [39] This corporate embrace underscored the belief that Ethereum’s underlying technology held immense potential for real-world enterprise solutions, beyond speculative digital currencies.

More recently, in 2024, the EEA announced shifts in its leadership, reflecting the ongoing evolution of the alliance. Paul Brody, an EEA board member representing EY, was appointed as the new chairperson, bringing a wealth of experience from the professional services sector. Concurrently, Karen Scarbrough, a board member from Microsoft, assumed the role of executive director, signaling a continued strong link to major tech players. Vanessa Grellet from Arche Capital also joined the board, further diversifying the leadership’s expertise. [40]

CryptoKitties and the ERC-721 NFT standard

The year 2017 also saw the rather unexpected, yet profoundly impactful, emergence of CryptoKitties . This seemingly whimsical blockchain game and decentralized application (dApp) allowed users to collect, breed, and trade unique digital cat artworks, each represented as a distinct NFT on the Ethereum network. [41] What began as a niche novelty quickly exploded in popularity, captivating users and collectors alike. Its widespread appeal garnered significant mainstream media attention, inadvertently providing Ethereum with an invaluable degree of exposure to a broader public. [42]

At its peak, CryptoKitties was not merely a popular game; it became the most actively used smart contract on the entire Ethereum network. [43] However, this unprecedented popularity came at a cost, serving as a stark, if somewhat adorable, illustration of Ethereum’s nascent scalability challenges. The game’s substantial consumption of network capacity at the time led to significant congestion, highlighting a critical bottleneck that the network would need to address as it matured. [44] It was an inconvenient metaphor for success.

This surge in interest in unique digital assets spurred a crucial development. In January 2018, a community-driven document, an “Ethereum Improvement Proposal” (EIP), was formally published. Authored primarily by civic hacker William Entriken and his collaborators, this paper was titled ERC-721: Non-Fungible Token Standard. [45] Its release was instrumental, as it introduced ERC-721 , establishing the very first official standard for non-fungible tokens on Ethereum. [46] This standardization was a pivotal moment, providing the necessary framework for verifiable uniqueness and ownership, and directly paving the way for Ethereum to become the undisputed epicenter of a multi-billion dollar market for digital collectibles. [47]

Continued developments

By January 2018, Ether had firmly cemented its position as the second-largest cryptocurrency by market capitalization , consistently trailing only bitcoin . [48] This relative standing, a testament to its enduring relevance and utility, was maintained as of 2021, according to subsequent updates. [3] [4]

The intersection of technology and geopolitics, however, can be fraught with unexpected complications. In 2019, Virgil Griffith , an employee of the Ethereum Foundation, found himself arrested by the US government. His alleged offense: presenting at a blockchain conference held in North Korea. [49] The legal fallout was severe; Griffith subsequently pleaded guilty in 2021 to one count of conspiring to violate the International Emergency Economic Powers Act. [50] It’s a sobering reminder that digital borders rarely align with physical ones.

Despite such external complexities, Ethereum’s integration into mainstream financial systems continued apace. In March 2021, Visa Inc. announced a significant step: it had begun settling stablecoin transactions directly using the Ethereum network. [51] This was followed in April 2021 by a substantial investment from major financial players: JP Morgan Chase , UBS , and MasterCard collectively poured US$65 million into ConsenSys , a software development firm deeply entrenched in building Ethereum-related infrastructure. [52]

The year 2021 also brought two crucial network upgrades. The first, codenamed “Berlin,” was implemented on 14 April 2021. [53] This was succeeded by the “London” upgrade, which took effect on 5 August. [54] The London upgrade was particularly noteworthy for its inclusion of Ethereum Improvement Proposal (“EIP”) 1559. This mechanism was designed to address the persistent issue of transaction fee volatility , a common pain point for users. EIP-1559 introduced a dynamic base fee that is “burned” (permanently removed from circulation) with each block, rather than being paid to the block proposer. A separate “tip” component, however, still goes to the proposer, creating an incentive structure. This burning mechanism has the dual effect of reducing the overall inflation rate of ether and, under certain network conditions, can even lead to periods of deflation. [55]

Amidst these planned evolutions, the blockchain experienced a brief, unplanned fork on 27 August 2021. This transient divergence was attributed to various network clients running incompatible software versions, a minor hiccup in the grand scheme of continuous development. [56]

Transition to proof-of-stake

The culmination of years of meticulous planning and development, “The Merge” (a name that elegantly replaced the more technical “Ethereum 2.0”), represented a profound paradigm shift for the Ethereum network. This comprehensive transition involved a sequence of three distinct updates—Bellatrix, Paris, and Shapella—all meticulously orchestrated to migrate Ethereum’s fundamental consensus protocol from the energy-intensive proof-of-work (PoW) model to the more efficient proof-of_stake (PoS) system. The Bellatrix update initiated the process by enhancing the capabilities of the proof-of-stake Beacon chain and integrating robust economic slashing mechanisms designed to penalize validator misbehavior. Paris, the true “Merge” event, occurred at block 15537393 on 15 September 2022, when the execution layer of Ethereum officially merged with the Beacon chain, effectively uniting the two systems. Finally, Shapella (a portmanteau of Shanghai and Capella) delivered the long-awaited functionality for staking withdrawals, providing liquidity to those who had committed their ETH to secure the network. [57]

The immediate and most celebrated consequence of this monumental shift from proof-of-work to proof-of-stake was a dramatic reduction in Ethereum’s energy consumption, estimated to be over 99%. [58] This was lauded as a significant step towards environmental sustainability within the cryptocurrency space. However, the broader impact on global energy consumption and climate change remains a subject of debate. Critics, with a valid point, suggest that the energy-intensive computational resources previously deployed for mining ether may simply be repurposed to mine other cryptocurrencies that still operate on proof-of-work, thus merely shifting the problem rather than solving it wholesale. [12] One can only hope for a more holistic approach, but then, hope isn’t exactly a robust consensus mechanism.

Post-Merge updates

Dencun

The journey of Ethereum’s evolution continued with the “Dencun” upgrade, also known as “Deneb-Cancun,” which officially went live on 13 March 2024. This significant update introduced a suite of enhancements, most notably EIP-4844 , colloquially referred to as “Proto-Danksharding.” The core innovation of Proto-Danksharding was the introduction of “blobs”—temporary, general-purpose data-availability containers. [59]

The fundamental advantage of “Blob” data is its ephemeral nature; it is stored only for a limited duration, making it substantially cheaper than utilizing conventional call data for persistent storage on the Layer 1 (L1) blockchain. This cost-efficiency is particularly beneficial for Ethereum’s Layer 2 (L2) networks, which are designed to scale the main chain. By leveraging blobs, L2 networks can significantly reduce the cost associated with posting their compressed transaction data back to the Layer 1, thereby contributing to lower transaction fees and improved throughput for end-users on these secondary layers. It’s a clever way to keep the underlying structure lean while supporting an ever-growing superstructure.

Pectra

Looking ahead, the Prague-Electra, or “Pectra,” update is slated for launch on 7 May 2025. This forthcoming upgrade promises to introduce several pivotal enhancements to the network. Among these is EIP-7251 , a proposal designed to inject greater flexibility into the staking mechanism. Currently, validators are required to stake precisely 32 ETH. EIP-7251 will expand this range, allowing validators to stake anywhere between 32 ETH and a maximum of 2048 ETH, offering more options for network participants. Furthermore, EIP-7702 is set to enable externally-owned accounts (EOAs), typically controlled by individual users with private keys, to temporarily adopt the advanced functionalities typically reserved for smart contracts. This promises a new layer of programmability and interaction for standard user accounts. [60]

Design

Overview

(Note: This section, like many detailing the bleeding edge of technology, leans heavily on references to primary sources . While informative, a healthy dose of secondary or tertiary sources would undoubtedly offer a more balanced perspective. But then, who has time for that when the future is being built?)

At its core, Ethereum functions as a vast peer-to-peer network . Its primary directive is to meticulously maintain a distributed database that records the precise storage values of all Ethereum accounts and to process every single state-altering transaction that occurs within its ecosystem. [61] The network operates in a rhythmic cycle: approximately every 12 seconds, a new collection of transactions, known as a “block,” is processed. Each block is cryptographically linked to its predecessors through a unique cryptographic hash , forming an unbroken, immutable chain—the very definition of the blockchain . [62]

Every “node”—a participant running the Ethereum software—maintains connections with a relatively small, dynamic subset of the broader network. This decentralized web allows nodes to efficiently broadcast newly discovered blocks and unvalidated transactions (those not yet enshrined in the blockchain) to their peers for download. Conversely, nodes also download any new information from their peers that they do not already possess. Given that each node typically connects to a unique set of peers, this gossiping mechanism ensures the rapid propagation of information throughout the entire network, often within mere seconds. A node’s temporary repository of unvalidated transactions awaiting inclusion in a block is commonly referred to as its “mempool.” [63]

For a node to fully participate and verify the network’s integrity, it must construct an accurate copy of the entire Ethereum state. This laborious but crucial process begins by taking the immutable genesis state and then sequentially executing every single transaction recorded in the blockchain. This execution must adhere strictly to the proper chronological order of blocks and the specific order in which transactions are listed within each block, ensuring a deterministic recreation of the network’s history. [64]

In the proof-of-stake system, any Ethereum account holder has the ability to “stake”—that is, to deposit—32 or more ETH to register as a “validator.” This commitment is the cornerstone of network security. At the conclusion of each “epoch,” which consists of 32 block slots (each slot lasting precisely 12 seconds), a sophisticated pseudorandom mechanism assigns each active validator to a specific slot in the subsequent epoch. In this assignment, a validator is designated either as a block proposer, responsible for creating a new block, or as an attester, tasked with verifying the validity of proposed blocks.

During its designated slot, a block proposer utilizes transactions from its mempool to assemble a new block, aiming for it to become the new “head”—the latest, canonical block—of the blockchain. Simultaneously, attesters review the proposed block and cast their “attestations,” essentially votes confirming which block they believe to be the rightful head of the chain. To maintain the network’s integrity, strict rules are enforced: if a validator engages in self-contradictory proposals or attestations, or if it simply remains inactive during its assigned duties, it incurs a penalty, losing a portion of its staked ETH in a process known as “slashing.” Conversely, any Ethereum account can augment a validator’s stake by sending additional ETH at any time, increasing its influence. A validator’s attestation carries a weight proportional to its stake, up to a maximum of 2,048 ETH. The Ethereum protocol dictates that the blockchain branch with the highest cumulative weight of attestations at any given moment is recognized as the canonical, authoritative chain. Validators are, naturally, compensated for their diligent work in proposing and attesting to valid blocks. These rewards are paid via transactions embedded within the very chain containing their proposals or attestations. This creates a powerful economic incentive: validators are financially motivated to support the chain that they believe will ultimately garner the most consensus from other validators, thereby fostering a high degree of collective agreement and stability across the network. It’s a delicate dance of self-interest and collective good, a recurring theme in decentralized systems. [65]

Ether

Ether (ETH) is not merely a digital token; it is the lifeblood of the Ethereum network, the native cryptocurrency meticulously generated in accordance with the Ethereum protocol. Its primary function is to serve as a reward for validators within the proof-of-stake system, compensating them for their essential role in adding and validating blocks to the blockchain. Within the network’s state, Ether is represented as an unsigned integer tied to each account, reflecting that account’s ETH balance, typically denominated in wei, where 10¹⁸ wei equates to a single ether. A rather large number for something so ethereal.

At the close of each epoch, fresh ETH is minted and distributed, with protocol-specified amounts being added to the balances of all validators who successfully made valid block proposals or attestations in the epoch preceding the last one (i.e., the epoch currently being finalized). Beyond its role as a reward, ether holds a singular distinction: it is the only currency that the protocol accepts for the payment of transaction fees. These fees are cleverly structured into two components: the base fee and the tip. The base fee, once paid, is “burned”—permanently deleted from existence, a deflationary mechanism—while the tip is directed to the block proposer. This combination of validator rewards and transaction tips creates a compelling economic incentive for validators to continuously process new transactions and ensure the blockchain’s uninterrupted growth. Therefore, ETH is not just a currency; it is absolutely fundamental to the operational integrity and sustained activity of the entire network. Functionally, ether can be “sent” from one account to another through a transaction, a process that simply involves decrementing the sender’s balance and incrementing the recipient’s balance by the same specified amount. [66]

A common, albeit persistent, error is the interchangeable use of “Ether” and “Ethereum.” To be clear, Ether is the currency, while Ethereum is the platform—a distinction that, for some, remains stubbornly elusive. [67] For those who appreciate visual identifiers, the uppercase Greek letter Xi , Ξ, has occasionally been adopted as an unofficial currency symbol for ether.

Accounts

Within the Ethereum ecosystem, two primary categories of accounts exist, each with distinct characteristics but sharing fundamental capabilities: user accounts, more formally known as externally-owned accounts (EOAs), and contract accounts. Both types are endowed with an ETH balance, granting them the ability to transfer ETH to any other account. They can also initiate the execution of another contract’s code or even deploy an entirely new contract onto the network. Crucially, both user and contract accounts are uniquely identified on the blockchain and within the network state by a distinct account address. [68]

The key differentiator lies in their programmatic nature. Contract accounts are the exclusive holders of associated bytecode and possess dedicated storage to maintain their contract-specific state. The code embedded within a contract is activated and evaluated whenever a transaction is directed to it. This code is designed to intelligently interpret user-specified data included within the incoming transaction and is capable of generating a return value upon completion. Beyond standard control flow statements, the bytecode of a smart contract is remarkably versatile. It can execute instructions to send ETH, read from and write to its own persistent storage, allocate temporary storage (memory ) that dissipates once the code execution concludes, perform complex arithmetic and hashing operations, initiate transaction-like calls to other contracts (thereby triggering their code execution), deploy new contracts, and even query various pieces of information about the current transaction or the overall blockchain state. [69] It’s a self-contained, programmable entity, capable of intricate interactions.

Addresses

Ethereum account addresses are structured with a specific, identifiable format. They commence with the prefix “0x,” a widely recognized identifier for hexadecimal notation, immediately followed by 40 hexadecimal digits. These digits represent the rightmost 20 bytes derived from the Keccak-256 hash of the ECDSA public key associated with the account, utilizing the specific secp256k1 curve. For clarity, since two hexadecimal digits represent a single byte, this results in a 40-character hexadecimal string after the “0x,” an example being 0xb794f5ea0ba39494ce839613fffba74279579268. Contract addresses adhere to this identical format; however, their generation process differs, being determined by the sender’s address and the creation transaction’s nonce . [70] It’s a system designed for precision, even if it looks like a string of random characters to the uninitiated.

Virtual machine

The Ethereum Virtual Machine (EVM) stands as the crucial runtime environment for the execution of all transactions within the Ethereum network. It is architecturally a stack -based virtual machine, equipped with an instruction set meticulously tailored for the unique demands of Ethereum’s decentralized applications. This instruction set is comprehensive, encompassing operations for managing the stack, manipulating memory, and querying the current execution context. Such context queries might include inspecting the remaining “gas” available for a transaction, retrieving information about the current block, or accessing details pertaining to the ongoing transaction itself.

A cornerstone of the EVM’s design is its commitment to determinism . This means that regardless of the underlying hardware or operating system on which it runs, given an identical pre-transaction state and the same transaction input, every single node on the network will invariably produce an identical post-transaction state. This unwavering determinism is absolutely critical, as it forms the bedrock of network consensus, ensuring that all participants agree on the canonical state of the blockchain. The intricate, formal definition of the EVM is precisely laid out in the aforementioned Ethereum Yellow Paper. [26] [71] The EVM’s design has proven so influential that it has inspired implementations across a wide spectrum of programming languages, including C++ , C# , Go , Haskell , Java , JavaScript , Python , Ruby , Rust , Elixir , and Erlang . There are even plans to integrate it with WebAssembly , further expanding its reach.

Gas

In the intricate machinery of the EVM, “gas” serves as a fundamental unit of account . Its primary purpose is to quantify the computational effort and storage resources required to execute operations, thereby facilitating the calculation of the transaction fee. This fee, denominated in ETH, is the compulsory payment a transaction’s sender must render to the network to ensure their transaction is included and processed within the blockchain. Each distinct operation that the EVM is capable of performing is assigned a specific, hardcoded gas cost. This cost is intentionally designed to be roughly proportional to the real-world monetary value of the resources—such as raw computation cycles and storage allocation—that a network node must expend or dedicate to successfully execute that particular operation. It’s an internal economy, designed to prevent abuse and manage resource allocation.

When initiating a transaction, the sender is required to specify two critical parameters: a gas limit and a gas price. The gas limit represents the absolute maximum amount of gas the sender is willing to consume for that specific transaction, acting as a safeguard against runaway computations. The gas price, conversely, defines the amount of ETH the sender is prepared to pay the network for each unit of gas utilized. A transaction’s inclusion in a block is contingent upon its gas price being greater than or equal to the block slot’s current base gas price. The portion of the gas price that exceeds this base rate is known as the “tip,” and it is directly awarded to the block proposer. This dynamic creates a direct incentive: a higher tip increases a block proposer’s motivation to include that transaction in their block, thereby accelerating its confirmation on the blockchain.

The mechanics of payment are straightforward: the sender’s ETH balance is debited the full potential cost (gas limit × gas price) at the very outset of the transaction’s execution. However, any unused gas at the transaction’s completion is meticulously refunded to the sender. This system ensures that resources are committed but not necessarily consumed. Critically, if a transaction exhausts its allocated gas before completing all operations, it “runs out of gas.” In such a scenario, the transaction is reverted entirely, meaning no state changes are permanently recorded. Despite the reversion, the sender is still charged for all the gas consumed up to the point of failure, receiving a refund only for the unused gas. This mechanism ensures that even failed attempts consume network resources and are appropriately compensated. For practical purposes, especially within user interfaces , gas prices are commonly expressed in gigawei (Gwei), a more manageable subunit of ETH equivalent to 10^-9 ETH. [72]

Applications

The Ethereum Virtual Machine ’s instruction set is famously Turing-complete . [26] This means, in essence, that it can compute anything a universal computer can, provided it has enough time and memory (or, in this context, gas). This fundamental capability has unlocked an astonishing array of applications built upon the Ethereum network. Popular uses have spanned the creation of both fungible (ERC-20) and non-fungible (ERC-721) tokens, each endowed with a diverse set of properties. It has facilitated innovative crowdfunding models, most notably through initial coin offerings . Beyond these, Ethereum is the bedrock for the rapidly expanding decentralized finance (DeFi) sector, enabling decentralized exchanges , and powering decentralized autonomous organizations (DAOs). Its flexibility also extends to more recreational applications, including various games, sophisticated prediction markets , and even gambling platforms. The sheer diversity of these applications underscores the platform’s versatility, a digital canvas for countless innovations.

Contract source code

Ethereum’s smart contracts are typically authored in high-level programming languages to enhance developer accessibility and reduce the propensity for errors. Solidity , a language specifically designed for the EVM with recognizable similarities to C and JavaScript , is the most prevalent choice, though other languages also exist. Once written, this human-readable source code is then compiled down into the more compact and machine-executable EVM bytecode . It is this bytecode, the machine’s direct instructions, that is ultimately deployed onto the Ethereum blockchain.

To foster transparency and enable robust verification, the source code of a contract, along with its compiler information, is generally published on blockchain explorer websites shortly after the contract’s deployment. This practice allows users to meticulously examine the underlying logic and independently verify that the compiled bytecode residing on-chain accurately reflects the intended source code, ensuring trust in the contract’s operations.

However, this inherent transparency, while beneficial for auditing, presents a significant challenge: bugs, particularly critical security vulnerabilities, are immediately visible to anyone scrutinizing the publicly available code. The immutable nature of blockchain technology means that once deployed, these contracts, and any flaws they contain, cannot be quickly or easily rectified. [73] This inflexibility was brutally demonstrated by the infamous 2016 attack on The DAO , an event where a critical vulnerability allowed a substantial theft of funds, a situation that, due to the blockchain’s design, could not be swiftly halted or reversed without a contentious network-wide intervention. [32] The code may be law, but sometimes the law has loopholes that are impossible to patch.

ERC-20 tokens

The ERC-20 (Ethereum Request-for-Comments #20) Token Standard stands as a foundational specification, enabling the creation and management of fungible tokens on the Ethereum blockchain . Proposed by Fabian Vogelsteller in November 2015, this standard essentially implements a standardized API (Application Programming Interface) for tokens residing within smart contracts . This standardization is crucial, as it ensures interoperability across the vast Ethereum ecosystem.

The ERC-20 standard mandates specific functions that any compliant token contract must implement. These include, but are not limited to, capabilities for transferring tokens from one account to another, querying the current token balance of any given account, and retrieving the total supply of the token available on the network. Smart contracts that rigorously adhere to and correctly implement these ERC-20 processes are referred to as ERC-20 Token Contracts. These contracts are responsible for meticulously tracking the issuance and ownership of all tokens created under their purview on Ethereum. The utility and widespread adoption of ERC-20 have been immense, leading to countless cryptocurrencies launching as ERC-20 tokens and being distributed effectively through initial coin offerings . [74] It’s the blueprint that built a thousand digital currencies, for better or worse.

Non-fungible tokens (NFTs)

Main article: Non-fungible token

Beyond the realm of fungible assets, Ethereum also provides the infrastructure for the creation of unique and indivisible digital items, known universally as non-fungible tokens (NFTs). [75] Unlike their fungible counterparts, each NFT possesses distinct characteristics that render it one-of-a-kind, incapable of being replaced by another identical item. This inherent uniqueness has led to their widespread application in representing a diverse range of digital and real-world assets. NFTs have been utilized for everything from digital collectibles and unique pieces of digital art to sports memorabilia, virtual real estate within metaverse environments, and even specific items within blockchain-based games. [76]

The formalization of NFTs on Ethereum began with ERC-721 , which emerged as the first official NFT standard. This was subsequently complemented by ERC-1155, a more advanced standard that introduced the concept of “semi-fungibility,” allowing for contracts to manage both fungible and non-fungible tokens efficiently. Both standards remain widely adopted across the ecosystem. [77] Interestingly, some early NFT projects, such as CryptoPunks , predate these formal standards and, in some cases, utilized fully fungible ERC-20 tokens to represent their unique digital assets, creating a curious historical anomaly. [78]

The very first NFT project, “Etheria,” a pioneering 3D map composed of tradable and customizable hexagonal tiles, was deployed to the Ethereum network as early as October 2015. It was then publicly demonstrated live at DEVCON1 in November of the same year, showcasing the nascent possibilities of digital ownership. [79] The broader phenomenon of NFTs truly exploded into mainstream consciousness in 2021. This was epitomized by Christie’s , the venerable auction house, selling a digital image accompanied by an NFT from the artist Beeple for an astounding US$69.3 million. This sale momentarily positioned Beeple as the third-most-valuable living artist in terms of auction prices at the time. However, it is worth noting, with a hint of cynical realism, that many observers pointed out that both the buyer and seller in this landmark transaction had a vested, financial interest in artificially inflating demand and perceived value for the artist’s work. [80] [81] A classic maneuver, regardless of whether the asset is physical or purely digital.

Decentralized finance

Main article: Decentralized finance

Decentralized finance (DeFi) represents a revolutionary paradigm, offering a suite of financial instruments constructed upon a decentralized architecture. This design fundamentally removes the need for traditional corporate or governmental intermediaries, granting users unprecedented control over their financial activities. DeFi protocols encompass a wide range of services, from sophisticated money market funds that enable users to earn interest on their digital assets to complex lending and borrowing platforms. [82]

Accessing these DeFi applications is typically facilitated through a Web3 -enabled browser extension or a dedicated application, with MetaMask being a prominent example. These tools empower users to directly interact with the Ethereum blockchain through a familiar website interface, bypassing centralized gatekeepers. [83] A key strength of the DeFi ecosystem is its composability: many of these Decentralized Applications (DApps) are designed to seamlessly connect and interoperate, allowing for the creation of incredibly complex and innovative financial services by chaining together various protocols. [84]

Illustrative examples of influential DeFi platforms include MakerDAO, a protocol responsible for the creation of the Dai stablecoin. Another significant player is Uniswap , a decentralized exchange (DEX) specifically built for trading tokens on Ethereum. Uniswap witnessed an explosive growth trajectory, surging from approximately US$20 million in locked liquidity to an impressive US$2.9 billion in 2020 alone. [86] The collective investment in various DeFi protocols also saw remarkable expansion; as of October 2020, over US$11 billion was reportedly invested across the sector. [87] Furthermore, through an ingenious process termed “wrapping,” certain DeFi protocols enable synthetic, tokenized versions of various traditional assets—such as bitcoin, gold, and even oil—to be traded directly on Ethereum. This innovation ensures these wrapped assets are fully compatible with all of Ethereum’s major wallets and applications, further blurring the lines between disparate asset classes. [87]

Enterprise software

The robust and flexible nature of Ethereum’s underlying technology has not gone unnoticed by the corporate world. Numerous enterprise software companies have actively engaged in testing and developing Ethereum-based software and private networks, operating independently from the public Ethereum blockchain. [88] This exploration signals a clear recognition of the blockchain’s potential for streamlined business processes and enhanced data security.

A diverse array of prominent companies has shown keen interest and actively participated in these endeavors. This list includes global technology giants like Microsoft and IBM , as well as major financial institutions such as JPMorgan Chase [66] and Deloitte . Other notable participants include R3, a blockchain software firm, and Innovate UK , which explored Ethereum for cross-border payments prototypes. [89] Further underscoring this trend, Barclays , UBS , Credit Suisse , Amazon , Visa , and a host of other corporations have also undertaken various experiments and pilot projects utilizing Ethereum’s capabilities. [90] [91] It seems even the most staid of institutions are willing to dip their toes into the digital ether, albeit carefully.

Permissioned ledgers

Beyond the public, open-access Ethereum blockchain, there is a growing interest in and deployment of Ethereum-based permissioned blockchain variants. These private or consortium ledgers are specifically designed for environments where access control and data privacy are paramount, making them suitable for various enterprise-level projects:

• In 2017, JPMorgan Chase , ever at the forefront of financial technology, proposed the development of JPM Coin . This digital currency was conceived to operate on a highly customized, permissioned variant of the Ethereum blockchain, which they christened “Quorum.” [92] Quorum was meticulously engineered to navigate the often-conflicting demands of privacy and transparency within the complex realm of derivatives and payments. The stated objective was to strike a delicate balance: to provide seamless access for regulators who require oversight of financial transactions, while simultaneously safeguarding the privacy of participating parties who naturally wish to shield their identities and the granular details of their transactions from the public gaze. [93] It’s an attempt to have the best of both worlds, a compromise that rarely satisfies everyone but often gets the job done.

Performance and scalability

As of December 2025, the theoretical maximum throughput for Ethereum’s Layer 1 (L1) stands at approximately 238 transactions per second (TPS). This figure is derived from its current gas limit of 60 million, a block time of 12 seconds, and an average gas cost of 21,000 for a standard ETH transfer. However, this theoretical peak is rarely achieved in practice. The actual average transaction throughput is considerably lower, primarily because complex smart contracts and batch transactions consume significantly more gas per block. As of January 2016, Ethereum typically averaged around 25 transactions per second, a figure that, somewhat surprisingly, did not substantially change even after the much-anticipated transition to proof-of-stake . [94]

To put this in perspective, the venerable Visa payment platform boasts the capability to process an astonishing 45,000 payments per second. This stark contrast inevitably leads many to question the fundamental scalability of Ethereum’s base layer, especially when contemplating its ambition to underpin a global financial system. [94] It’s a bit like trying to run a marathon on a unicycle; it might work, but it won’t be fast.

Ethereum’s blockchain employs a sophisticated data structure known as a Merkle –Patricia Tree to efficiently store the account state within each block. [95] This trie structure offers several critical advantages, including significant storage savings, the ability to generate concise set membership proofs (often referred to as “Merkle proofs”), and facilitating efficient synchronization for “light clients”—nodes that do not store the entire blockchain history. Despite these optimizations, the network has historically grappled with congestion issues. A notable instance occurred in 2017, when the unexpected popularity of the CryptoKitties game placed an immense strain on network resources, highlighting the need for more robust scaling solutions. [96]

In response to these persistent scalability challenges, the Ethereum ecosystem has been diligently developing and implementing Layer 2 (L2) solutions. These L2 networks represent a crucial approach to expand Ethereum’s capacity, enabling it to handle a far greater volume of transactions with significantly reduced fees. [97] Conceptually, a Layer 2 chain operates as a distinct blockchain that extends the functionality of Ethereum’s Layer 1 (L1) while simultaneously inheriting its fundamental security guarantees. [98] The landscape of L2 chains is diverse, encompassing various technical approaches. Prominent among these are optimistic rollups, which assume transactions are valid unless proven otherwise, and zero-knowledge rollups (zk-rollups), which utilize advanced cryptography to prove transaction validity off-chain. [99] [100] [101] Depending on their specific architectural design and implementation details, some L2 chains are engineered to process thousands of transactions per second, offering a much-needed boost to Ethereum’s overall throughput and user experience. [102] [103] It’s a testament to the ingenuity of the community, building highways on top of a perfectly functional, if somewhat narrow, road.

Legal status and regulation

(Note: The legal landscape surrounding digital assets is a perpetually shifting quagmire, and the perspectives offered here are largely framed within the context of the United States. To truly grasp the global implications, one would need a far more comprehensive, worldwide view , a task that would likely require more legal scholars than available processing power. Consider this a snapshot, subject to immediate obsolescence.)

The legal classification of Ether (ETH), the native token of the Ethereum platform, remains an area rife with ambiguity and considerable variation across different international jurisdictions. This lack of universal clarity creates a complex regulatory environment for participants.

In the United States, there has been a consistent and growing inclination among regulatory authorities to classify Ether as a commodity, placing it squarely under the purview of the Commodity Futures Trading Commission (CFTC). The CFTC has, on multiple occasions, explicitly asserted its regulatory authority over Ethereum. A notable instance occurred in 2019, when former CFTC Chairman Heath Tarbert unequivocally declared that “ETH is a commodity,” a stance that has been consistently upheld by subsequent leadership within the commission. [104] [105] This classification is largely predicated on the inherently decentralized nature of the Ethereum network, a characteristic that differentiates it from traditional securities, which typically represent an investment in a centralized common enterprise.

From the perspective of private law, many jurisdictions have acknowledged Ether as a form of intangible personal property. This recognition implies that ETH can be legally owned, freely transferred, and even utilized as collateral, much like other established forms of personal property. [106] Specifically within the United States, the 2022 Amendments to the Uniform Commercial Code (UCC) introduced a groundbreaking new category of personal property: “controllable electronic records” (CERs). This innovative legal framework explicitly encompasses digital assets like Ether. Under UCC Article 12, ETH is now classified as a CER, providing a comprehensive and much-needed legal structure for its commercial circulation and integration into the broader economy. [107] It’s a slow, grinding process, but even the law eventually catches up to the future, albeit reluctantly.

Notes

• ^ Cryptocurrencies do not have a formal ISO 4217 alpha-3 code. “ETH” is informal only.

References

• [1] Beiko, Tim. “EIP-7607: Hardfork Meta - Fusaka”. Ethereum Improvement Proposals . Ethereum.org. Retrieved 14 December 2025.
• [2] “Clients”. Ethernodes . 6 June 2023. Archived from the original on 11 June 2023. Retrieved 6 June 2023.
• [3] a b 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.
• [4] a b Vigna, Paul (3 June 2021). “DeFi Is Helping to Fuel the Crypto Market Boom—and Its Recent Volatility”. The Wall Street Journal . ISSN 0099-9660. Archived from the original on 13 August 2021. Retrieved 14 August 2021.
• [5] a b c d Tapscott & Tapscott 2016, pp. 87.
• [6] Paumgarten, Nick (15 October 2018). “The Prophets of Cryptocurrency Survey the Boom and Bust”. The New Yorker . Archived from the original on 9 January 2020. Retrieved 7 December 2021.
• [7] Foundation, Ethereum (30 July 2015). “Ethereum Launches”. blog.ethereum.org . Archived from the original on 11 August 2015. Retrieved 9 January 2020.
• [8] 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 . August 2015. Archived from the original on 13 November 2020. Retrieved 17 February 2021.
• [9] 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.
• [10] “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.
• [11] Sarkar, Arijit (29 October 2022). “The Merge brings down Ethereum’s network power consumption by over 99.9%”. Cointelegraph . Retrieved 17 July 2025.
• [12] a b Clark, Aaron (6 December 2022). “Ethereum’s Energy Revamp Is No Guarantee of Global Climate Gains”. Bloomberg.com . Archived from the original on 7 December 2022. Retrieved 1 January 2023.
• [13] “Ethereum Whitepaper”. ethereum.org . Archived from the original on 9 February 2024. Retrieved 10 February 2024.
• [14] 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.
• [15] 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.
• [16] a b Tapscott, Don; Tapscott, Alex (2016). The Blockchain Revolution: How the Technology Behind Bitcoin is Changing Money, Business, and the World . Portfolio. ISBN 978-0670069972 .
• [17] 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: Harper Business. pp. 40–44. ISBN 9780062886149 . OCLC 1117469014.
• [18] Russo 2020, pp. 44.
• [19] Tapscott & Tapscott 2016, pp. 278.
• [20] a b c d e 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.
• [21] “The Uncanny Mind That Built Ethereum”. Wired . ISSN 1059-1028. Archived from the original on 13 July 2017. Retrieved 4 May 2021.
• [22] 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.
• [23] Russo 2020, pp. 56.
• [24] “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.
• [25] 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.
• [26] a b c 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.
• [27] 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.
• [28] Gupta, Vinay (3 March 2015). “The Ethereum Launch Process”. Ethereum Foundation. Archived from the original on 6 June 2017. Retrieved 5 June 2017.
• [29] 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 .
• [30] 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.
• [31] Gün Sirer, Emin (19 July 2016). “A Call for a Temporary Moratorium on “The DAO”” (PDF). Retrieved 16 December 2024.
• [32] 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.
• [33] Price, Rob (17 June 2016). “Digital Currency Ethereum is Cratering Amid Claims of a $50 Million Hack”. Business Insider . Archived from the original on 11 June 2017. Retrieved 14 May 2017.
• [34] 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.
• [35] Leising, Matthew (13 June 2017). “The Ether Thief”. www.bloomberg.com . Archived from the original on 26 December 2018. Retrieved 21 December 2018.
• [36] 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.
• [37] 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.
• [38] “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.
• [39] “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.
• [40] “Enterprise Ethereum Alliance Announces New Leadership and Vision”. Yahoo! . 19 March 2024. Retrieved 13 September 2024.
• [41] Bamakan, Seyed Mojtaba Hosseini; Nezhadsistani, Nasim; Bodaghi, Omid; Qu, Qiang (9 February 2022). “Patents and intellectual property assets as non-fungible tokens; key technologies and challenges”. Scientific Reports . 12 (1): 2178. arXiv:2304.10490. Bibcode:2022NatSR..12.2178B. doi:10.1038/s41598-022-05920-6. ISSN 2045-2322. PMC 8828876. PMID 35140251.
• [42] “CryptoKitties, a game about digital cats, is bringing cryptocurrencies to the mainstream”. Fox News . 14 December 2017. Archived from the original on 3 December 2023. Retrieved 3 December 2023.
• Cheng, Evelyn (6 December 2017). “Meet CryptoKitties, the $100,000 digital beanie babies epitomizing the cryptocurrency mania”. CNBC . Archived from the original on 20 November 2018. Retrieved 3 December 2023.
• Jiang, Xin-Jian; Liu, Xiao Fan (2021). “CryptoKitties Transaction Network Analysis: The Rise and Fall of the First Blockchain Game Mania”. Frontiers in Physics . 9 631665: 57. Bibcode:2021FrP…..9…57X. doi:10.3389/fphy.2021.631665. ISSN 2296-424X.
• [43] Tepper, Fitz (3 December 2017). “People have spent over $1M buying virtual cats on the Ethereum blockchain”. TechCrunch . Archived from the original on 9 December 2019. Retrieved 3 December 2023.
• [44] “CryptoKitties Mania Overwhelms Ethereum Network’s Processing”. Bloomberg.com . 4 December 2017. Archived from the original on 17 November 2021. Retrieved 3 December 2023.
• Wong, Joon Ian (4 December 2017). “CryptoKitties is jamming up the ethereum network”. Quartz . Archived from the original on 15 July 2018. Retrieved 3 December 2023.
• Schroeder, Stan (4 December 2017). “CryptoKitties is Ethereum’s hit game, but it’s threatening the entire network”. Mashable . Archived from the original on 3 December 2023. Retrieved 3 December 2023.
• “CryptoKitties, a game about digital cats, is bringing cryptocurrencies to the mainstream”. Fox News . 14 December 2017. Archived from the original on 3 December 2023. Retrieved 3 December 2023.
• [45] Butler, Michael (3 June 2021). “This local technologist made Philly the birthplace of the leading NFT standard”. Technical.ly . Archived from the original on 28 November 2023. Retrieved 3 December 2023.
• “ERC-721: Non-Fungible Token Standard”. Ethereum Improvement Proposals . Archived from the original on 22 November 2021. Retrieved 3 December 2023.
• Sherwood, Sonja. “40 unded 40 -William Entriken”. Drexel Magazine . Archived from the original on 28 November 2023. Retrieved 3 December 2023.
• [46] Madine, Mohammad; Salah, Khaled; Jayaraman, Raja; Battah, Ammar; Hasan, Haya; Yaqoob, Ibrar (2022). “Blockchain and NFTs for Time-Bound Access and Monetization of Private Data”. IEEE Access . 10 : 94186–94202. Bibcode:2022IEEEA..1094186M. doi:10.1109/ACCESS.2022.3204274. S2CID 252094824.
• Regner, Ferdinand; Urbach, Nils; Schweizer, André. “NFTs in Practice – Non-Fungible Tokens as Core Component of a Blockchain-based Event Ticketing Application”. ICIS 2019 Proceedings . Archived from the original on 23 May 2022. Retrieved 3 December 2023.
• Bamakan, Seyed Mojtaba Hosseini; Nezhadsistani, Nasim; Bodaghi, Omid; Qu, Qiang (9 February 2022). “Patents and intellectual property assets as non-fungible tokens; key technologies and challenges”. Scientific Reports . 12 (1): 2178. arXiv:2304.10490. Bibcode:2022NatSR..12.2178B. doi:10.1038/s41598-022-05920-6. ISSN 2045-2322. PMC 8828876. PMID 35140251.
• [47] Bamakan, Seyed Mojtaba Hosseini; Nezhadsistani, Nasim; Bodaghi, Omid; Qu, Qiang (9 February 2022). “Patents and intellectual property assets as non-fungible tokens; key technologies and challenges”. Scientific Reports . 12 (1): 2178. arXiv:2304.10490. Bibcode:2022NatSR..12.2178B. doi:10.1038/s41598-022-05920-6. ISSN 2045-2322. PMC 8828876. PMID 35140251.
• Karadag, Bulut; Akbulut, Akhan; Zaim, Abdul Halim (2022). “A Review on Blockchain Applications in Fintech Ecosystem”. 2022 International Conference on Advanced Creative Networks and Intelligent Systems (ICACNIS) . pp. 1–5. doi:10.1109/ICACNIS57039.2022.10054910. ISBN 979-8-3503-3444-9 . S2CID 257313812.
• “Ethereum Crash Course”. Fortune . Retrieved 3 December 2023. [permanent dead link]
• Ostroff, Caitlin (8 May 2021). “The NFT Origin Story, Starring Digital Cats”. Wall Street Journal . ISSN 0099-9660. Archived from the original on 12 December 2021. Retrieved 3 December 2023.
• [48] 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.
• [49] 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.
• [50] “Cryptocurrency expert pleads guilty to conspiring to help North Korea dodge sanctions”. Washington Post . Archived from the original on 17 December 2021. Retrieved 24 January 2022.
• [51] 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.
• [52] 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.
• [53] “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.
• [54] 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.
• [55] “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.
• [56] Mehrotra, Kartikay (28 August 2021). “Most Used Blockchain Averts Crisis After Software Flaw Is Fixed”. Bloomberg . Archived from the original on 28 August 2021. Retrieved 28 August 2021.
• [57] “The history of Ethereum”. Ethereum.org . Retrieved 18 March 2025.
• [58] “The Merge”. The Merge . Retrieved 18 March 2025.
• [59] Bambysheva, Nina. “Ethereum’s Dencun Upgrade: A Leap Toward Cheaper Decentralized Applications”. Forbes . Archived from the original on 3 April 2024. Retrieved 3 April 2024.
• [60] “History of Ethereum”. Ethereum.org . Retrieved 28 October 2025.
• [61] “Networking Layer”. Ethereum.org . Retrieved 25 May 2024.
• [62] “Blocks”. Ethereum.org . Retrieved 25 May 2024.
• [63] “Nodes and Clients”. Ethereum.org . Retrieved 25 May 2024.
• [64] “Ethereum Virtual Machine (EVM)”. Ethereum.org . Retrieved 25 May 2024.
• [65] “What is Staking?”. Consensys.io . Retrieved 25 May 2024.
• [66] a b 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.
• [67] 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.
• [68] “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.
• [69] “Introduction to Smart Contracts”. SolidityLang.org . Archived from the original on 27 January 2021. Retrieved 19 January 2021.
• [70] “How Ethereum address are derived (EOAs, CREATE, and CREATE2)”. RareSkills . 2025. Retrieved 7 November 2025.
• [71] Triantafyllidis, Nikolaos Petros (19 February 2016). “The Ethereum Project: Ethereum History”. Developing an Ethereum Blockchain Application (Report). University of Amsterdam. p. 20.
• [72] 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.
• [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.
• [74] 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.
• [75] 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.
• [76] 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.
• [77] Bamakan, Seyed Mojtaba Hosseini; Nezhadsistani, Nasim; Bodaghi, Omid; Qu, Qiang (9 February 2022). “Patents and intellectual property assets as non-fungible tokens; key technologies and challenges”. Scientific Reports . 12 (1): 2178. arXiv:2304.10490. Bibcode:2022NatSR..12.2178B. doi:10.1038/s41598-022-05920-6. ISSN 2045-2322. PMC 8828876. PMID 35140251.
• Arcenegui, Javier; Arjona, Rosario; Baturone, Iluminada (11 August 2023). “Non-Fungible Tokens Based on ERC-4519 for the Rental of Smart Homes”. Sensors (Basel, Switzerland) . 23 (16): 7101. Bibcode:2023Senso..23.7101A. doi:10.3390/s23167101. ISSN 1424-8220. PMC 10459112. PMID 37631638.
• Sitaru, Sebastian; Kaczmarczyk, Robert; Zink, Alexander (20 December 2022). “Nonfungible tokens (NFTs) in dermatology and health care: A guide for health care professionals”. JEADV Clinical Practice . 2 (1): 32–37. doi:10.1002/jvc2.95. ISSN 2768-6566. S2CID 254965788.
• Di Angelo, Monika; Salzer, Gernot (1 September 2023). “Identification of token contracts on Ethereum: standard compliance and beyond”. International Journal of Data Science and Analytics . 16 (3): 333–352. doi:10.1007/s41060-021-00281-1. ISSN 2364-4168. S2CID 239710307.
• Karadag, Bulut; Akbulut, Akhan; Zaim, Abdul Halim (2022). “A Review on Blockchain Applications in Fintech Ecosystem”. 2022 International Conference on Advanced Creative Networks and Intelligent Systems (ICACNIS) . pp. 1–5. doi:10.1109/ICACNIS57039.2022.10054910. ISBN 979-8-3503-3444-9 . S2CID 257313812.
• [78] Upson, Sandra. “The 10,000 Faces That Launched an NFT Revolution”. Wired . ISSN 1059-1028. Archived from the original on 3 December 2023. Retrieved 3 December 2023.
• Ross, Dian; Cretu, Edmond; Lemieux, Victoria (2021). “NFTS: Tulip Mania or Digital Renaissance?”. 2021 IEEE International Conference on Big Data (Big Data) . pp. 2262–2272. doi:10.1109/BigData52589.2021.9671707. ISBN 978-1-6654-3902-2 . S2CID 245956102.
• [79] “The Cult of CryptoPunks”. TechCrunch . 8 April 2021. Archived from the original on 6 May 2021. Retrieved 10 July 2021.
• [80] Gerlis, Melanie (18 February 2021). “Christie’s gets digital with the art world’s non-fungible craze”. Financial Times . 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.
• [81] Ravenscraft, Eric (12 March 2022). “NFTs Don’t Work the Way You Might Think They Do”. Wired. Archived from the original on 10 November 2022. Retrieved 5 April 2022.
• [82] Kauflin, Jeff. “Why Everyone in Crypto Is Talking About DeFi”. Forbes . Archived from the original on 31 July 2020. Retrieved 25 July 2020.
• [83] “MetaMask’s Blockchain Mobile App Opens Doors For Next-Level Web”. Bloomberg.com . 2 September 2020. Archived from the original on 9 September 2020. Retrieved 19 April 2021.
• [84] “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.
• [85] “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.
• [86] 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.
• [87] a b 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.
• [88] “Big Business Giants From Microsoft to J.P. Morgan Are Getting Behind Ethereum”. Fortune . Archived from the original on