  Recent studies of asymptotic symmetries suggest, that a Hamiltonian phase
space analysis in gravitational theories might be able to account for black
hole microstates. In this context we explain, why the use of conventional Bondi
fall-off conditions for the gravitational field is too restrictive in the
presence of an event horizon. This implies an enhancement of physical degrees
of freedom ($\mathcal{A}$-modes). They provide new gravitational hair and are
responsible for black hole microstates. Using covariant phase space methods,
for the example of a Schwarzschild black hole, we give a proposal for the
surface degrees of freedom and their surface charge algebra. The obtained
two-dimensional dual theory is conjectured to be conformally invariant as
motivated from the criticality of the black hole. Carlip's approach to entropy
counting reemerges as a Sugawara-construction of a 2D stress-tensor.
