Logbook logging question

[SkyRider1]

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!

[S-Works]

No verification required. The penalties for parker pen hours are severe enough I think to deter all but the most hardened from making entries up.

[BackPacker]

In case there's any doubt, keep the invoices.

[Whopity]

They don't even require your signature in the logbook! Just your name address and licence details. Art 79(1)

[pfeinstein]

Though you probably won't be required to show anything, keep all the paperwork involved for your timebuilding trip. It'll help show that it was a real experience, in case someone wants to question your time over there.

[SkyRider1]

Thank you all for your advices!