In the Japanese city of Okinawa, there are several cryptocurrency trading platforms that cater to the local market. Some of the popular platforms include:

1. Coincheck: Coincheck is one of the largest cryptocurrency exchanges in Japan and offers a wide range of digital assets for trading. It is known for its user-friendly interface and security features, making it a popular choice among traders in Okinawa.

2. BitFlyer: BitFlyer is another prominent cryptocurrency exchange in Japan that provides a platform for trading various cryptocurrencies. It is known for its competitive trading fees and high liquidity, making it a preferred choice for both beginner and experienced traders in Okinawa.

3. Liquid: Liquid is a global cryptocurrency exchange that also serves the Japanese market, including Okinawa. It offers a wide range of trading pairs and advanced trading tools for users looking to engage in more complex trading strategies.

4. GMO Coin: GMO Coin is a subsidiary of GMO Internet Group, one of the largest internet companies in Japan. It offers a secure and reliable platform for trading cryptocurrencies, as well as additional services such as margin trading and lending.

5. Bitbank: Bitbank is a cryptocurrency exchange based in Japan that provides a platform for trading popular digital assets such as Bitcoin and Ethereum. It is known for its responsive customer support and competitive trading fees, making it a popular choice among traders in Okinawa.

These are just a few of the cryptocurrency trading platforms available in Okinawa. It is important for traders to conduct thorough research and choose a platform that best suits their trading needs and preferences. Additionally, it is recommended to follow proper security measures and adhere to regulatory guidelines while trading cryptocurrencies in Okinawa.