# Answer
#### Overview
Bitcoin is a decentralized digital currency that operates independently of a central bank. It was invented in 2008 by an unknown person or group of people using the pseudonym Satoshi Nakamoto and started in 2009 when its source code was released as open-source software.
#### Transaction Process
Bitcoin transactions are conducted on a peer-to-peer network and do not require intermediaries. These transactions are verified by network nodes through cryptography and are recorded on a public ledger known as a blockchain. This makes Bitcoin transactions more secure than traditional financial transactions because they do not rely on trust in a specific counterparty. The integrity and the chronological order of the blockchain are enforced with cryptography.
#### Linking Transactions to Individuals
Transactions can be linked to individuals and companies through "idioms of use". For example, transactions that spend coins from multiple inputs indicate that the inputs may have a common owner. This is corroborated by public transaction data with known information on owners of certain addresses.
#### Criticisms and Risks
However, Bitcoin has been criticized for its association with illegal transactions, its high electricity consumption, price volatility, and thefts from exchanges. Some economists and commentators have characterized it as a speculative bubble.
#### Bitcoin as an Investment
Bitcoin has also been used as an investment, although several regulatory agencies have issued investor alerts about bitcoin. Despite the risks and criticisms, Bitcoin has gained popularity and has been adopted by various businesses and institutions as a form of payment.
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# Answer
#### Introduction
Ethereum is an open-source, blockchain-based platform that enables developers to build and deploy decentralized applications (dApps). It was proposed in late 2013 by Vitalik Buterin, a cryptocurrency researcher and programmer, and development was crowdfunded in 2014. The network went live on 30 July 2015.
#### Ethereum's Cryptocurrency: Ether (ETH)
Ethereum's native cryptocurrency is called Ether (ETH). Ether is used to compensate participating nodes for computations performed in the Ethereum network, known as "gas". This is done to prevent spam on the network and allocate resources proportionally to the incentive offered by the request.
#### Key Innovations: Ethereum Virtual Machine (EVM) and Smart Contracts
One of the key innovations of Ethereum is the Ethereum Virtual Machine (EVM), which can execute scripts using an international network of public nodes. This allows for the creation of "smart contracts", which are self-executing contracts with the terms of the agreement directly written into code. These smart contracts can interact with other contracts, make decisions, store data, and send Ether to others.
#### Use Cases: ICOs and DeFi
Ethereum has been used for many initial coin offerings (ICOs) and is also being used as a platform for decentralized finance (DeFi), a use case that has exploded in popularity in 2020.
#### Criticisms and Challenges
However, like Bitcoin, Ethereum has been criticized for its scalability issues and its use in illegal activities. It has also faced challenges with network upgrades and forks.Bitcoin is a decentralized digital currency invented in 2008 by Satoshi Nakamoto and released as open-source software in 2009. Transactions are conducted on a peer-to-peer network, verified through cryptography and recorded on a blockchain. Transactions can be linked to individuals and companies through "idioms of use". However, Bitcoin has been criticized for its association with illegal transactions, high electricity consumption, price volatility, and thefts from exchanges. Despite these risks, Bitcoin has gained popularity and is adopted by businesses and institutions as a payment method.
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