You raise an essential point about the value of digital currencies being derived from their market presence and usability in circulation. In terms of recommending a digital currency that aligns with this criteria, one notable example is Bitcoin (BTC). Bitcoin has established itself as a widely recognized cryptocurrency with a substantial market and increasing acceptance as a medium of exchange. Its decentralized nature and limited supply contribute to its value proposition. However, it's important to note that the cryptocurrency market is dynamic, and thorough research is necessary to evaluate specific projects and their potential for adoption and real-world use. Factors such as transaction speed, scalability, governance, and partnerships play a crucial role in determining a digital currency's viability as a widely used medium of exchange. Stay informed, explore various projects, and consider their technological advancements and real-world applications to identify potential currencies that align with your criteria.

cryptocurrency trading does have various types. Here are some common types of cryptocurrency trading:

1. Spot Trading: This is the most basic form of trading where you buy or sell cryptocurrencies for immediate delivery at the current market price. Spot trading involves the direct exchange of one cryptocurrency for another or for fiat currency.

2. Margin Trading: Margin trading allows traders to borrow funds, often leveraging their initial capital, to increase their trading position. It enables traders to potentially amplify their profits, but it also carries higher risks due to potential losses.

3. Futures Trading: Futures trading involves buying or selling contracts that obligate traders to buy or sell a specific amount of cryptocurrency at a predetermined price and future date. It allows traders to speculate on the price movement of cryptocurrencies without owning the underlying assets.

4. Options Trading: Options trading involves buying or selling contracts that give traders the right, but not the obligation, to buy or sell cryptocurrencies at a predetermined price and within a specified time frame. Options provide traders with flexibility and risk management strategies.

5. Day Trading: Day trading refers to the practice of opening and closing trades within the same day. Day traders aim to profit from short-term price fluctuations and typically use technical analysis and chart patterns to make trading decisions.

6. Swing Trading: Swing trading involves holding positions for a longer period, ranging from a few days to weeks. Swing traders aim to capture medium-term price movements and often rely on both technical and fundamental analysis.

7. Algorithmic Trading: Algorithmic trading involves using automated systems or algorithms to execute trades based on predefined strategies. These algorithms analyze market data, identify patterns, and execute trades without human intervention.

8. Social Trading: Social trading platforms allow users to observe and copy the trades of successful traders. It enables beginners to learn from experienced traders and replicate their strategies.

These are just a few examples of the types of cryptocurrency trading available. Each type has its own characteristics, benefits, and risks, and traders choose the approach that aligns with their trading goals and risk tolerance.

It's understandable that the market instability of 2022 has left many traders feeling confused and concerned about the future of altcoins. While predicting the exact performance of specific altcoins is challenging, I can provide you with a few recommendations based on current trends and developments in the crypto space. Please keep in mind that these suggestions are not financial advice, and conducting your own thorough research is crucial before making any investment decisions. Here are a few altcoins worth considering in 2023:

1. Ethereum (ETH): Despite the recent market fluctuations, Ethereum remains a significant player in the crypto space. With its robust smart contract functionality and growing adoption in decentralized finance (DeFi) and non-fungible tokens (NFTs), Ethereum has the potential for further growth.

2. Cardano (ADA): Cardano is a blockchain platform aiming to provide a secure and scalable infrastructure for decentralized applications. With its focus on academic research, rigorous peer-review processes, and plans for smart contract capabilities, Cardano has generated considerable interest and could be a promising investment.

3. Polkadot (DOT): Polkadot is a multi-chain platform that enables different blockchains to interoperate, creating a more connected and scalable ecosystem. Its unique architecture and focus on interoperability make it an intriguing project to watch.

4. Avalanche (AVAX): Avalanche is a platform designed for decentralized applications, boasting high transaction speeds and low fees. With its focus on scalability and developer-friendly environment, Avalanche has gained attention within the crypto community.

5. Chainlink (LINK): Chainlink is a decentralized oracle network that connects smart contracts with real-world data, enabling the execution of trusted and secure blockchain-based applications. As the demand for reliable external data increases, Chainlink's technology could prove invaluable.