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Cryptocurrency — Grokipedia Fact-checked by Grok 20 days ago Cryptocurrency Ara Eve Leo Sal 1x Type Digital asset Category Digital currency Inception Year 2009 First Cryptocurrency Bitcoin Creator Satoshi Nakamoto Whitepaper Date October 31, 2008 Genesis Block Date January 3, 2009 First Real World Transaction May 22, 2010: Laszlo Hanyecz purchased two Papa John's pizzas for 10,000 BTC Underlying Technology Blockchain Decentralization Decentralized Permission Model Permissionless Pseudonymity Level Pseudonymous Transaction Verification Cryptographic methods and consensus mechanisms Consensus Mechanisms proof-of-work proof-of-stake delegated proof-of-stake proof-of-authority Supply Models limited unlimited Primary Uses medium of exchange store of value platform for decentralized applications DeFi NFTs Smart Contract Origin Ethereum Major Examples Bitcoin Ethereum Litecoin Tether Monero Dogecoin Number Of Cryptocurrencies ≈19,000 Total Market Cap $3.1 trillion Largest By Market Cap Bitcoin Second Largest By Market Cap Ethereum Dominant Market Share 57.5% Regulatory Status Varies by jurisdiction; legal and regulated in many countries, banned in some Energy Consumption Note Significant for proof-of-work mechanisms Cryptocurrency is a class of digital assets intended as mediums of exchange. These assets use cryptography to secure their creation and verify transactions. They operate on decentralized networks, such as blockchains, which remove the need for central authorities. [1] [2] [3] This article examines cryptocurrencies through their technological foundations, including blockchain and consensus mechanisms; historical development from early concepts to recent innovations; economic models governing supply, markets, and price dynamics; adoption in transactions, decentralized finance, and emerging applications; regulatory frameworks across jurisdictions; and ongoing controversies alongside societal impacts. Definition and Fundamentals Core Principles and Formal Definition Cryptocurrency constitutes a category of digital assets intended to serve as a medium of exchange, employing cryptographic methods to secure transactions, regulate the issuance of new units, and confirm asset transfers. This framework enables peer-to-peer electronic payments directly between parties, circumventing traditional financial intermediaries by relying on cryptographic proof rather than centralized trust. The inaugural implementation, Bitcoin, was outlined in a whitepaper authored by the pseudonymous Satoshi Nakamoto on October 31, 2008, defining it as "a purely peer-to-peer version of electronic cash" that resolves double-spending through a distributed timestamp server and proof-of-work consensus. [4] Subsequent cryptocurrencies extend these foundations but adhere to analogous structures using decentralized ledgers like blockchain. [5] Central to cryptocurrencies is decentralization , distributing authority across a network of independent nodes that collectively validate and record transactions, thereby mitigating single points of failure and reducing dependence on trusted third parties such as banks. [6] This principle counters the vulnerabilities of centralized systems, where a single entity could censor transactions or manipulate records, a concern highlighted by events like the 2008 financial crisis that provided context for Bitcoin's development. [4] Cryptographic security underpins the system, utilizing public-key cryptography for digital signatures to verify ownership and authorize transfers, and hash functions to ensure data integrity. [4] [5] These principles promote transparency via public ledgers and pseudonymity through address-based identities. [5] Classification of Cryptocurrencies Cryptocurrencies are broadly classified by their technical architecture, consensus mechanisms, and intended functionalities, reflecting diverse design choices since Bitcoin's inception in 2009. Native coins, such as Bitcoin (BTC), operate on independent blockchains and serve primarily as mediums of exchange or stores of value, typically launched by developing a new blockchain or forking an existing one, a process that is technically complex and resource-intensive. Tokens are digital assets issued on existing blockchains, often adhering to standards like Ethereum's ERC-20 protocol, and can be created more simply through smart contracts on established platforms. [7] [8] [9] This distinction arose as platforms like Ethereum enabled programmable contracts, allowing issuance of tokens without independent consensus layers. [10] Consensus mechanisms determine how networks validate transactions and maintain security, with proof-of-work (PoW) used in early designs like Bitcoin, where miners compete to solve cryptographic puzzles and consume significant energy. [11] Proof-of-stake (PoS), adopted by Ethereum, selects validators probabilistically based on staked holdings, reducing energy use compared to PoW while introducing risks like centralization around large stakers. [12] Other variants include delegated proof-of-stake (DPoS), which elects delegates for faster throughput as in EOS, and proof-of-authority (PoA), which relies on trusted nodes for efficiency in permissioned networks but sacrifices decentralization. [13] By primary use case, payment cryptocurrencies like Bitcoin and Litecoin emphasize transaction speed and scarcity, with Bitcoin's 21 million supply cap hardcoded in its protocol. [14] Infrastructure or platform cryptocurrencies, exemplified by Ethereum, support decentralized applications (dApps) via smart contracts, hosting ecosystems for DeFi and NFTs. [8] Stablecoins maintain price stability through fiat or asset pegs; Tether (USDT) is backed by reserves including U.S. Treasuries. [10] [15] Privacy coins, such as Monero (XMR), employ techniques like ring signatures and stealth addresses to obscure transaction details, contrasting with transparent blockchains. [16] Utility tokens grant access to services within ecosystems, like Filecoin (FIL) for decentralized storage, while security tokens represent ownership in real-world assets and are subject to securities laws in jurisdictions like the U.S. [14] Among tokens, hype-driven memecoins exhibit high volatility and low technical barriers to launch, while utility tokens are tied to specific project functionalities. Meme coins, such as Dogecoin created as a joke, derive value from social hype rather than technical innovation, exhibiting high volatility. [17] Central bank digital currencies (CBDCs), such as China's digital yuan, represent centrally issued digital money with state governance and control, contrasting with the decentralized nature of cryptocurrencies. [10] These categories overlap, with many projects evolving; for instance, Ethereum's shift to PoS expanded its utility beyond payments. [18] Shiba Inu (SHIB) Shiba Inu (SHIB) is one of the most popular meme tokens built on the Ethereum blockchain as an ERC-20 standard token. Launched in August 2020 by an anonymous founder using the pseudonym Ryoshi, it was initially positioned as a community-driven experiment and a playful rival to Dogecoin. With an enormous total supply of 1 quadrillion tokens, SHIB quickly attracted a massive following known as the "SHIBArmy" through social media hype and viral marketing, leading to significant price surges during the 2021 bull market. Notable events include the anonymous founder sending a large portion of the supply to Ethereum co-founder Vitalik Buterin, who subsequently burned a substantial amount (reducing circulating supply) and donated the remainder to charitable causes. The project has evolved beyond its meme origins by developing supporting infrastructure, including ShibaSwap (a decentralized exchange launched in 2021) and Shibarium (an Ethereum layer-2 network introduced in 2023 for lower fees and higher throughput). SHIB represents the broader trend of meme coins achieving substantial market presence and ecosystem growth through community engagement rather than traditional technological fundamentals. Historical Development Intellectual Precursors and Early Concepts The intellectual foundations of cryptocurrency trace back to the cypherpunk movement, which emerged in the late 1980s and emphasized strong cryptography for privacy protection and decentralized systems resistant to centralized control. In 1988, Timothy C. May published "The Crypto Anarchist Manifesto," envisioning cryptographic protocols for anonymous transactions and contracts that would bypass traditional enforcement, influencing designs for privacy-preserving digital cash. [19] Early technical precursors focused on anonymous digital payments, starting with David Chaum's 1982 development of blind signatures, which enabled untraceable electronic tokens verifiable without identity linkage. formalized in his 1983 paper "Blind Signatures for Untraceable Payments," this approach informed privacy-centric systems. Chaum's 1989 DigiCash implemented eCash with cryptographic anonymity to prevent double-spending and tracking, though centralized, highlighting challenges in pre-decentralized privacy models before its 1998 bankruptcy. [20] By the mid-1990s, efforts shifted toward decentralization. In 1997, Adam Back proposed Hashcash, a proof-of-work (PoW) system requiring computational puzzles to generate valid stamps, originally for anti-spam but providing a primitive for timestamping and securing ledgers without intermediaries. [21] In 1998, Wei Dai outlined b-money, a distributed electronic cash protocol using PoW for ledger maintenance and contract enforcement, eliminating central authorities. Concurrently, Nick Szabo's bit gold employed timestamped PoW chains to create scarce, unforgeable digital assets stored in distributed registries, mimicking commodity money's properties. In 1999, J. Orlin Grabbe's Digital Monetary Trust represented an issuer-based proto-digital-cash attempt with anonymous bearer accounts via cryptography and off