How do i differentiate between a scam and a real bitcoin miner? Someone offered to trade for me through bitcoin. He said i should send a bitcoin to crytomine company then he is going to claim it from the company so that he trades it with a commission of 10% of profit within 48 hours.
Bitcoin mining involves setting up and running highly specialized computer machinery called ASICs (application specific integrated circuits). If you are being told you will be 'mining', but are not setting up and running these machines yourself, then chances are you are being scammed. Pretty much every instance of 'cloud mining' through some website service is a scam. 

Consider: you have an ASIC machine, that profitably prints money for you. Do you:

a) use that machine to make money? OR

b) rent the use of the machine to someone else?

If you chose b), then you must expect to make more money than a) by doing so. This extra money must come from the user that is renting the machine, which means the user renting the machine is going to lose money, net.

The reality is, mining seems complicated to new users, so scammers often pretend to run 'mining operations' when they are trying to scam people. Being a 'miner' makes the scammer seem knowledgeable and wealthy, so that new users will be lured in. 


  Someone offered to trade for me through bitcoin... with a commission of 10% of profit within 48 hours.


This is the second massive red flag. No legitimate broker would promise a commission of 10% within 48 hours. Professionally managed wealth funds aim for a smaller return than that, annually! 

If that sort of profit was guaranteed, the broker would quickly become the wealthiest person on earth. With $1000 invested, after 1 year of 10% returns every two days, the broker would have ~$34,156,133,221. Obviously, this is completely absurd.