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A blockchain is a digitized, decentralized ledger of transactions. Blockchains record a continuously growing list of records, called blocks, which are linked and secured using cryptography.

A cryptocurrency is a digital currency that only has value dependent on those who back it. For security, cryptocurrencies rely on blockchaining: a database organized in such a way that records are kept secure through peer-to-peer networks. Each record is kept within a block, and each block holds a timestamp and link to the block before it. The first cryptocurrency was Bitcoin, implemented in 2009 by Satoshi Nakamoto.

Ethereum is a decentralized platform that runs contract-based applications without any possibility of downtime, censorship, fraud or third-party interference. Ethereum blockchain focuses on running the code of any decentralized application.

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Peer-to-Peer (P2P) applications share resources and communicate in a decentralized or distributed architecture. Often application nodes communicate directly with each other or cooperate to do work which benefits other nodes or the overall P2P system. In a pure P2P system, there is no distinction between client and server.

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Solidity is a statically-typed curly-braces programming language designed for developing smart contracts that run on various blockchain platforms, most notably, Ethereum. The Solidity programming language is an open source, community project governed by a core team. The core team is sponsored by the Ethereum Foundation. The programs compiled by the Solidity are intended to be run on Ethereum Virtual Machine.

Bitcoin is a cryptocurrency developed by Satoshi Nakamoto in 2009. Bitcoin is used as a digital payment system. Rather than use traditional currency (USD, YEN, EURO, etc.) individuals may trade in, or even mine Bitcoin. It is a peer-to-peer system, and transactions may take place between users directly.

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