As long as it's from the main network and it's not just another sort of wrapped bitcoin then you're getting the legit bitcoin. You can always check the transaction through explorer on different websites like (https://blockchair.com/bitcoin) and input the address or transaction ID there.
And that will check if it's on the actual chain and the easiest thing to do and know it is by using bitcoin addresses that start from bc1q, 1, and 3.