To claim Unibet sign up offer, you will have to verify your account. As proof of identity, you can upload a scanned copy of your ID, passport or driving license. For address confirmation, any utility bill not older than 3 months will do. That includes gas, electricity or water bill. to confirm your banking details you can upload a scanned copy of your debit card (both sides). In case of any doubt, you can always contact Unibet customer support.