They ask you to invest your bitcoin money in Grand Index Options as their bitcoin company trading. But i believe it is a fake website. They will show your profits in 7 days. Then they will ask you again to pay 12% as tax for that profit promising you will get the net profit. But only to find out it is a scam. The person i have talked to is Pat Edah in facebook. Also posting payout scam and using several facebook profiles. She or he also has a whatsapp account with phone number +1-516-387-6854.