Logbook logging question
This summer I'll be traveling to the US to do my hour building flying SOLO towards my IR, CPL, ATPL, etc, now I have a PPL. I was wondering if the CAA would require any sort of verification/authentication of the time flown besides my signature in the logbook, like for example a signature of the private owner of the plane, or in case I rent it at a FBO, any stamp or certificate. Just to avoid surprises and an unnecessary trip back to the States. Any recommendations of FBOs in California would also be appreciated.
Thanks!