As of now, there are no specific rankings or lists available for the top ten Bitcoin exchanges in Harvard, an American city. However, there are several popular and reputable exchanges that are commonly used by residents and investors in the area.

Some of the top Bitcoin exchanges that are commonly used in Harvard include Coinbase, Kraken, Binance, Bitfinex, Gemini, and Bittrex. These exchanges offer a user-friendly interface, secure trading platform, and a wide range of cryptocurrencies for trading.

Coinbase is one of the most well-known and widely used Bitcoin exchanges in the United States. It offers a simple and easy-to-use platform for buying, selling, and storing cryptocurrencies. Kraken is another popular exchange that is known for its strong security features and advanced trading options.

Binance is a global cryptocurrency exchange that offers a wide range of cryptocurrencies for trading. It is known for its low fees and high liquidity. Bitfinex is another popular exchange that offers advanced trading tools and features for experienced traders.

Gemini is a US-based exchange that is regulated and licensed, making it a trusted platform for buying and selling cryptocurrencies. Bittrex is another well-known exchange that offers a wide range of cryptocurrencies for trading and has a strong reputation for security.

Overall, these exchanges are some of the top choices for residents and investors in Harvard who are looking to buy, sell, and trade Bitcoin and other cryptocurrencies. It is important to do thorough research and due diligence before choosing an exchange to ensure the safety and security of your investments.