Recently I was working with a client. He told me that he will pay me in BTC. After the work completed. He paid me certain bitcoins on a BTC platform named "NETCOINER.CASH". But when I am withdrawing BTC from that wallet to an external wallet. it is saying u have to deposit 0.02 BTC through an external wallet for verification. I want to know is it a regular practice for verification or it's a scam.
The website where he has transferred me BTC in "NETCOINER.CASH". The domain of this website changes from time to time.