  We propose a covariant prescription to compute holographic entanglement
entropy and Poincare blocks (Global BMS blocks) in the context of
three-dimensional Einstein gravity in flat space. We first present a
prescription based on worldline methods in the probe limit, inspired by recent
analog calculations in AdS/CFT. Building on this construction, we propose a
full extrapolate dictionary and use it to compute holographic correlators and
blocks away from the probe limit.
