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Bitcoin is a cryptocurrency, a form of money that uses cryptography to control its creation and management, rather than relying on central authorities. However, not all of the technologies and concepts that make up bitcoin are new; the presumed pseudonymous Satoshi Nakamoto (the creator of bitcoin, see below) integrated many existing ideas from the cypherpunk community when creating bitcoin. ==Pre-history== Prior to the release of bitcoin there were a number of digital cash technologies starting with the issuer based ecash protocols of David Chaum 〔 * * 〕 and Stefan Brands. Adam Back developed hashcash, a proof-of-work scheme for spam control. The first proposals for distributed digital scarcity based cryptocurrencies were Wei Dai's b-money and Nick Szabo's bit gold. Hal Finney developed RPOW. Bit gold, b-money and RPOW all used hashcash as their proof-of-work algorithm. Independently and at around the same time, Wei Dai proposed b-money and Nick Szabo proposed bit gold. Subsequently, Hal Finney implemented and deployed RPOW a reusable form of hashcash based on IBM secure TPM hardware and remote attestation (centralized but with no issuer inflation risk). In the bit gold proposal which proposed a collectible market based mechanism for inflation control, Nick Szabo also investigated some additional enabling aspects including a Byzantine fault-tolerant asset registry to store and transfer the chained proof-of-work solutions.〔 There has been much speculation as to the identity of Satoshi Nakamoto with suspects including Wei Dai, Hal Finney and accompanying denials. The possibility that Satoshi Nakamoto was a computer collective in the European financial sector has also been bruited.〔(Bitcoin Inventor Satoshi Nakamoto is Anonymous-style Cell from Europe ) 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「History of Bitcoin」の詳細全文を読む スポンサード リンク
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