I will definitely do this and then, let my bank know that a large transaction is coming in so that my bank account will be put on hold for suspicious activity or money fraud.
I wouldn't do that. There is a chance that your bank won't do anything with your account when you receive such a large sum of money. Don't wake up sleeping dogs when you don't have to. I'm 100% sure that when you do notify them about a large incoming transfer, they will ask you to provide proof of source, which you claim to not be able to provide.
Don't shoot yourself in the foot.
I do have proof of source where the funds came from. The funds came from my Forex brokerage trading account. Forex a legitimate currency exchange market. I am sure the banks know what Forex is because banks also participate in the Forex market. Every time I withdraw funds from my Forex brokerage account, I keep copies of the transaction history.