  The measurement of the velocity of money is still a significant topic. In
this paper, we proposed a method to calculate the velocity of money by
combining the holding-time distribution and lifespan distribution. By
derivation, the velocity of money equals the holding-time distribution's value
at zero. When we have much holding-time data, this problem can be converted to
a regression problem. After a numeric simulation, we find that the calculating
accuracy is high even if we used only a small part of the holding time data,
which implies a potential application in measuring the velocity of money in
reality, such as digital money. We also tested the methods on Cardano and found
that the method can also provide a reasonable estimation of velocity in some
cases.
