Not if you can re-establish credentials after selling them and cast a second vote that silently spoils whatever the buyer sends. Though that might count as ele

Not if you can re-establish credentials after selling them and cast a second vote that silently spoils whatever the buyer sends. Though that might count as electronic-in-person, as you'd need some unsellable credential (e.g. live video of you showing your ID and the date-time, sending a fingerprint, etc) which can take precedence over the one you sold (a username/password, an earlier-dated video/fingerprint/whatever, etc). But then I guess the buyer just waits til the deadline, and buys the live video of you establishing credentials and casting your vote for them, so you can't fraud them... seems a lot more convoluted though.