Proof to whomever is the paymaster?
Bingo.
Mind, out here in CaCaLand ballot harvesting is a legit business. And, it is done by paid collectors. If you haven’t experienced this yet in your area, it will occur in Nov.
This is how the 2022 elections will be corrupted totally, just like in 2020. There is no hope of any sort of valid election in any area that permits mailin or harvesting.
That is one of the reasons why Newsom survived the recall — rampant harvesting. So much so that hundreds of invalid ballots were confiscated in the hands of a convicted felon — and the guy was released within 24 hours.
This corruption is not treated as a crime — even if it is.