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Blockchain. A blockchain is a distributed ledger with growing lists of records (blocks) that are securely linked together via cryptographic hashes. [1][2][3][4] Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data (generally represented as a Merkle tree, where data nodes are represented by leaves).
Bitcoin wallets were the first cryptocurrency wallets, enabling users to store the information necessary to transact bitcoins. [85][8]: ch. 1, glossary The first wallet program, simply named Bitcoin, and sometimes referred to as the Satoshi client, was released in 2009 by Nakamoto as open-source software. [7]
Bitcoin's blockchain can be loaded with arbitrary data. In 2018 researchers from RWTH Aachen University and Goethe University identified 1,600 files added to the blockchain, 59 of which included links to unlawful images of child exploitation, politically sensitive content, or privacy violations. "Our analysis shows that certain content, e.g ...
Satoshi Nakamoto. Satoshi Nakamoto is the name used by the presumed pseudonymous [1][2][3][4] person or persons who developed Bitcoin, authored the Bitcoin white paper, and created and deployed Bitcoin's original reference implementation. [5] As part of the implementation, Nakamoto also devised the first blockchain database. [6]
Blockchain.com (formerly Blockchain.info) is a cryptocurrency financial services company. The company began as the first Bitcoin blockchain explorer in 2011 and later created a cryptocurrency wallet that accounted for 28% of bitcoin transactions between 2012 and 2020. It also operates a cryptocurrency exchange and provides institutional markets ...
Stuart Haber is an American cryptographer and computer scientist, known for his contributions in cryptography and privacy-preserving technologies and widely recognized as the co-inventor of the blockchain. His 1991 paper "How to Time-Stamp a Digital Document”, [1] co-authored with W. Scott Stornetta, won the 1992 Discover Award for Computer ...
Ethereum. Ethereum is a decentralized blockchain with smart contract functionality. Ether (abbreviation: ETH[a]) is the native cryptocurrency of the platform. Among cryptocurrencies, ether is second only to bitcoin in market capitalization. [2][3] It is open-source software.
According to blockchain data company Chainalysis, criminals laundered US$8,600,000,000 worth of cryptocurrency in 2021, up by 30% from the previous year. [212] The data suggests that rather than managing numerous illicit havens, cybercriminals make use of a small group of purpose built centralized exchanges for sending and receiving illicit ...