  The causal set program as well as the Wolfram physics project leave open the
problem of how a graph that is a (3+1)-dimensional Minkowski-spacetime
according to its simple geodesic distances, could be generated solely from
simple deterministic rules. This paper provides a solution by describing simple
rules that characterize discrete Lorentz boosts between 4D lattice graphs,
which combine further to form Wigner rotations that produce isotropy and lead
to the emergence of the continuous Lorentz group and the (3+1)-dimensional
Minkowski-spacetime. On such graphs, the speed of light, the proper time
interval, as well as the proper length are all shown to be highly accurate.
