What is the fine-grained topic of the following text: Final Hash CEO Marshall Long discusses Bitcoin mining in China.Crypto Fundamentals: A quick guide on how to calculate your costs, ROI and potential profitability to see if Bitcoin mining is worth it for you.As noted in an interview with CCN, Bitcoin mining starts by looking at a nonce -- a value that results in a double SHA-256 hash. Only return the topic.
Bitcoin mining profitability and calculation