Most modern crypto gambling sites offer various types of promos. One of the most popular among these proposals is registration (signup) present. Free Bitcoin signup bonus means cash for play or free spins. All bonuses, conditions for their receipt and wagering are combined into a single system — crypto casino bonus policy. The main task of it is to attract new customers to the site and maintain interest in the game among regular players. Here is a review of this and some other popular promos that BTC casinos offer to their customers.