yeah it is true all bit coins mined in 2040. so we have to use bit coins in these before. present in the market bit coin has great demand i would like to buy bit coins for my needs. so i have to keep hold few months or years next i have to use it for my needs. really using bit coin and alt coins very happy. actually i felt in the currency never replace anything but bit coin has replaced it. so i was very happy to this.