vDOT (voucher DOT) is a liquid staking derivative (LSD) of staked DOT, with fully underlying DOT reserve and yield-bearing feature of DOT staking reward. Users can deposit DOT into Bifrost SLP protocol and get vDOT as return, vDOT can be traded in the open market or be redeemed back to DOT. Holding vDOT equals to holding the DOT staking position, staking rewards appriciate the exchange price of vDOT.