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With the adjustment of the algorithm, it becomes more and more difficult to mine Bitcoin, and the profit is getting lower and lower.

As of `2021-08-14`, it is becoming more and more difficult to mine Bitcoin, and profits are getting lower and lower. Every 2016 blocks, or about every two weeks, Bitcoin resets the difficulty of mining by miners. On Friday morning, as expected, the Bitcoin code automatically increased the difficulty of solving a block by approximately 7.3%.

ETH query transaction records of an address

Apikey needs to be applied for. Apikey is a parameter that is needed to call those interfaces in etherscan. It needs you to apply for it and you can get it after registering an account. Each account holds up to 3 tokens, request API service service, only one of them is required