  We study the identity-based solution of Witten's cubic bosonic open string
field theory constructed by Takahashi and Tanimoto, which is claimed to
describe the tachyon vacuum. We argue that the observables of the solution
coincide with those of the tachyon vacuum using the method proposed by
Kishimoto and Takahashi. We also discuss how to treat the kinetic term of the
string field theory expanded around it.
