  The relativistic quantum protocols realizing the bit commitment and distant
coin tossing schemes are proposed. The protocols are based on the fact that the
non-stationary orthogonal extended quantum states cannot be reliably
distinguished if they are not fully accessible for the measurement. As the
states propagate from the domain controlled by one of the user to the domain
accessible for the measurements performed by the other user, they become
reliably distinguishable for the second user. Important for the protocol are
both the quantum nature of the states and the existence of a finite maximum
speed of the signal propagation imposed by the special relativity.
