The stupid idea was easy. Making the $5 state transitions safe was the hard part.

VETO is a public wall where a short statement costs $5 to post, $5 to veto, and $5 to revive.

The surprising engineering problem was the race: two people trying to veto the same live sentence must not both get charged for one state change. We built the action path around durable Postgres state and provider-confirmed payments.

The product is live at https://veto.it.com. Curious which part of VETO people think will break first.