Doesn't the statement that a black hole's information resides on the event horizon contradict the statement that there exist a singularity in the centre of the black hole?
Mass falling into the hole, according to an observer who's falling along with the mass sees the mass fall towards the singularity, so the information doesn't end up on the horizon.
If an observer looks at a freely falling mass towards the black hole from a great distance, the observer will also see the mass crossing the horizon falling towards the singularity. Only for clocks that stay at a fixed position with respect to the event horizon time advances slower. But a freely falling body, maximising it's falling time (though passing through points where time advances at a slower pace, or even at zero pace at the horizon, after which the radial space dimension swaps with the time dimension) is just seen as passing the horizon, so it's not frozen at the horizon. How else could black holes have developed?