It&#x27;s unfortunate that most bitcoin-related posts require the reader to have a lot of in-depth knowledge about the details of how bitcoin transactions work. As somewhat-interested-person, I can &#x2F;just&#x2F; figure out what the gist of the story is (&#x27;Alice can show she knows the answer and can then transfer the answer in an atomic payment&#x27;), but it&#x27;s completely unclear to me how either part works. The &quot;The buyer makes his payment to the following ScriptPubkey&quot; section is maybe the worst offender in that respect -- apparently that script is supposed to be obvious, but it&#x27;s not clear to me what it does &#x2F;at all&#x2F;.