  We prove that dissipative weak solutions of the Camassa-Holm equation are
unique. Thus we complete the global well-posedness theory of this celebrated
model of shallow water, initiated by a general proof of existence in [Z. Xin,
P. Zhang Comm. Pure Appl. Math. 53 (2000)]. As the dissipative weak solutions,
being viscosity solutions, seem to constitute the most physically relevant
class of solutions in the wave-breaking regime, the result provides
mathematical rationale for the feasibility of the Camassa-Holm equation as a
model of water waves encompassing both soliton interactions and wave-breaking.
