Cryptocurrency can make a person a millionaire through several pathways, each carrying varying degrees of risk and potential reward:

1. **Early Investment in Successful Coins**: Investing in cryptocurrencies like Bitcoin or Ethereum in their early stages has made many millionaires. These individuals bought the coins when they were worth very little and held onto them as their values skyrocketed.

2. **Trading**: Active trading of cryptocurrencies can also yield significant profits. Traders buy and sell coins based on market trends and price movements. Successful traders use strategies such as day trading, swing trading, and arbitrage.

3. **Staking and Yield Farming**: Some cryptocurrencies offer staking rewards or yield farming opportunities. By locking up their coins for a certain period, users can earn interest or additional coins, which can compound their wealth over time.

4. **Participation in Initial Coin Offerings (ICOs) or Initial Exchange Offerings (IEOs)**: Investing in new cryptocurrency projects through ICOs or IEOs can be highly profitable if the projects succeed. Early investors often buy tokens at very low prices before they are listed on exchanges.

5. **Creating and Selling NFTs**: Non-Fungible Tokens (NFTs) have created new opportunities for artists and creators to monetize their work. Those who have successfully created and sold popular NFTs have made substantial profits.

6. **Developing Blockchain Solutions**: Entrepreneurs and developers who create successful blockchain-based applications, platforms, or services can generate significant revenue, attracting venture capital investment or earning substantial returns from their innovations.

7. **Mining**: Mining cryptocurrencies, particularly in the early days of a coin, can be profitable. Successful miners earn rewards in the form of new coins for verifying transactions on the blockchain.

8. **Holding (HODLing)**: Long-term holding of cryptocurrencies, especially those with strong fundamentals and growth potential, can result in substantial appreciation in value over time.