  We propose a new example of entanglement knitting spacetime together,
satisfying a series of checks of the corresponding von Neumann and Renyi
entropies. The conjectured dual of de Sitter in d+1 dimensions involves two
coupled CFT sectors constrained by residual d-dimensional gravity. In the d=2
case, the gravitational constraints and the CFT spectrum are relatively
tractable. We identify a finite portion of each CFT Hilbert space relevant for
de Sitter. Its maximum energy level coincides with the transition to the
universal Cardy behavior for theories with a large central charge and a sparse
light spectrum, derived by Hartman, Keller, and Stoica. Significant
interactions between the two CFTs, derived previously for other reasons,
suggest a maximally mixed state upon tracing out one of the two sectors; we
derive this by determining the holographic Renyi entropies. The resulting
entanglement entropy matches the Gibbons-Hawking formula for de Sitter entropy,
including the numerical coefficient. Finally, we interpret the Gibbons-Hawking
horizon entropy in terms of the Ryu-Takayanagi entropy, and explore the time
evolution of the entanglement entropy.
