There were several alternative cryptocurrencies (altcoins) to Bitcoin that were considered potential investment opportunities. Please keep in mind that the cryptocurrency market is highly volatile and can change rapidly, so it's essential to conduct thorough research and consider all risks before making any investment decisions. Here are some popular alternatives to Bitcoin at that time:


1. Ethereum (ETH): Ethereum is the second-largest cryptocurrency by market capitalization and is known for its smart contract functionality. It has a vast ecosystem of decentralized applications (dApps) and is a platform for creating and executing programmable contracts and tokens.

2. Ripple (XRP): Ripple is designed for fast, low-cost international money transfers and is backed by a company called Ripple Labs. It aims to facilitate cross-border payments for financial institutions.


3. Litecoin (LTC): Often referred to as the "silver to Bitcoin's gold," Litecoin is a peer-to-peer cryptocurrency that aims to improve upon some of Bitcoin's limitations, such as transaction speed and scalability.


4. Cardano (ADA): Cardano is a blockchain platform that aims to provide a more secure and scalable infrastructure for the development of decentralized applications and smart contracts.

5. Polkadot (DOT): Polkadot is a multi-chain blockchain platform that enables interoperability between different blockchains, allowing them to share information and functionality.


6. Chainlink (LINK): Chainlink is a decentralized oracle network that connects smart contracts with real-world data, enabling them to interact with external systems and data sources securely.

7. Solana (SOL): Solana is a high-performance blockchain platform known for its fast transaction processing speed and low fees, making it attractive for decentralized applications and DeFi projects.


8. Binance Coin (BNB): Binance Coin is the native cryptocurrency of the Binance exchange and is used to pay for trading fees on the platform. It has expanded its utility beyond the exchange, offering various use cases within the Binance ecosystem.


9. Cardano (ADA): Cardano is a blockchain platform that uses a unique proof-of-stake consensus algorithm called Ouroboros. It aims to provide a secure and scalable infrastructure for the development of decentralized applications and smart contracts.

10. Polygon (MATIC): Polygon, previously known as Matic Network, is a Layer 2 scaling solution for Ethereum that aims to improve transaction speed and reduce fees. It facilitates a more efficient and cost-effective environment for decentralized applications.


Remember that the cryptocurrency market is highly speculative and can be subject to significant fluctuations. If you're considering investing in any cryptocurrency, it's essential to do thorough research, understand the project's fundamentals, and consider the risks involved. Additionally, consider seeking advice from a qualified financial advisor before making any investment decisions.