3. Important concepts in the currency circle

1. Blockchain technology: Blockchain is a decentralized distributed ledger technology, which is characterized by security, transparency and immutability. Blockchain technology is the foundation of the currency circle and the core of cryptocurrency.

2. Cryptocurrency: Cryptocurrency is a digital currency issued based on blockchain technology, which uses cryptography to achieve secure transactions and control the issuance of currency. Bitcoin, Ethereum and Litecoin are the most well-known cryptocurrencies in the currency circle.

3. ICO (Initial Coin Offering): ICO refers to the first token issuance, similar to the IPO (Initial Public Offering) in the traditional financial field. ICO is a common fundraising method in the currency circle.

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