Recently, I’ve been organizing some thoughts about digital currencies and realized that this topic is actually much more complex than many people think.

When it comes to digital currencies, many people's first reaction is Bitcoin. But actually, the core logic of digital currencies is quite interesting — it is based on a network of nodes and cryptographic algorithms, with no central issuing authority, a fixed total supply, and transactions that require network node approval. These three features fundamentally change the rules of the traditional monetary game.

I’ve noticed that compared to traditional payment methods, digital currencies have several obvious advantages. First, transaction costs are much lower, eliminating the need to pay third-party fees, especially for cross-border transfers. According to McKinsey data, blockchain applications can reduce the cost of each transaction from $26 to $15, saving about 40%, which is a significant expense for cross-border e-commerce. Second, transaction speed is faster because decentralization eliminates the need for clearing centers, enabling real-time settlement 24/7. Additionally, they offer high anonymity, although this also introduces some risks.

But this is a double-edged sword. If digital currencies are widely adopted, the impact on the existing financial system could be substantial. Monetary policy might become ineffective because the issuance volume depends entirely on the issuer’s discretion, making it difficult for authorities to monitor precisely. The intermediary role of banks could also be weakened, requiring a redesign of financial infrastructure. There are also security concerns — just look at Bitcoin’s price volatility. In May 2010, 10k BTC bought a pizza for only $25; by the end of 2013, it surged to $1,200; and between 2017 and 2018, it skyrocketed to $20,000. Such volatility poses a serious threat to financial stability.

However, the application prospects are indeed promising. In cross-border payments, digital currencies can help promote the internationalization of the Chinese yuan. In 2018, the total cross-border payment settlement volume was about 8 trillion RMB; using digital currency solutions could greatly improve efficiency. Bank collateral management can also be automated through smart contracts, reducing manual repetitive work. In the fields of bill finance and supply chain finance, about 70% of transactions in China are still paper-based, leaving huge room for digital transformation. Shenzhen has already developed a blockchain-based electronic bill system, which is a good practical example.

Currently, there are many types of digital currencies. Some are fully closed virtual currencies that can only be used within specific communities; others can be purchased with real money but cannot be exchanged back; and some, like Bitcoin, can be exchanged both ways. At this stage, digital currencies are still mostly investment products because they lack price stability and have not yet become a true means of payment. Trading platforms profit from transaction fees and premiums, while investors seek opportunities within this space.

Overall, digital currencies are a field worth continuous attention, with both challenges and opportunities.