  Entanglement-based attacks, which are subtle and powerful, are usually
believed to render quantum bit commitment insecure. We point out that the no-go
argument leading to this view implicitly assumes the evidence-of-commitment to
be a monolithic quantum system. We argue that more general evidence structures,
allowing for a composite, hybrid (classical-quantum) evidence, conduce to
improved security. In particular, we present and prove the security of the
following protocol: Bob sends Alice an anonymous state. She inscribes her
commitment $b$ by measuring part of it in the + (for $b = 0$) or $\times$ (for
$b=1$) basis. She then communicates to him the (classical) measurement outcome
$R_x$ and the part-measured anonymous state interpolated into other, randomly
prepared qubits as her evidence-of-commitment.
