  We study the dS/CFT duality between minimal type-A higher-spin gravity and
the free Sp(2N) vector model. We consider the bulk spacetime as "elliptic" de
Sitter space dS_4/Z_2, in which antipodal points have been identified. We apply
a technique from arXiv:1509.05890, which extracts the quantum-mechanical
commutators (or Poisson brackets) of the linearized bulk theory in an
*observable patch* of dS_4/Z_2 directly from the boundary 2-point function.
Thus, we construct the Lorentzian commutators of the linearized bulk theory
from the Euclidean CFT. In the present paper, we execute this technique for the
entire higher-spin multiplet, using a higher-spin-covariant language, which
provides a promising framework for the future inclusion of bulk interactions.
Aside from its importance for dS/CFT, our construction of a Hamiltonian
structure for a bulk causal region should be of interest within higher-spin
theory itself. The price we pay is a partial symmetry breaking, from the full
dS group (and its higher-spin extension) to the symmetry group of an observable
patch. While the boundary field theory plays a role in our arguments, the
results can be fully expressed within a boundary *particle mechanics*. Bulk
fields arise from this boundary mechanics via a version of second quantization.
