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# Validation Scripts

By
Travis Horn

# Triggering Change

Lecture 2, Part 1

Lecture Video

Endpoints are labelled as "available functions" in the Plutus Playground. In the Auction Example, there are 3 endpoints:

  • bid
  • close
  • start

In the close endpoint, there are two scenarios:

  • There is a highest bidder. In that case the token goes to that bidder.
  • There is not a highest bidder. In that case the token goes back to the auction starter.

If the close endpoint didn't exist, the ADA and token contained in the contract would be locked there forever. Contracts on the blockchain are just data. Absolutely passive. In order for anything to happen there must be a new transaction submitted from somebody that consumed UTxOs and produces new ones. A contract will never spring into action on its own.

You could write some logic for a wallet that automatically sleeps for a given amount of time until the deadline and then invokes the close endpoint.