I know that ideally reading challenge owners should go through each prompt page and check regularly whether new additions match the prompt's criteria. But in practice, it can be hard to remember which books you have and haven't checked. I can imagine this is particularly discouraging for people with several ongoing challenges.

The current interface does not make this task easier, so here's a suggestion. What if there were a "verified" flag available to challenge owners? Like so:

1. The "verified" flag would automatically apply to owner-added books.

2. Verified books would show up at the top of each prompt's list for all challenge participants — not the most recently-added books, which are in fact more likely to have issues.

3. Challenge owners could filter out all verified books under each prompt to go through the non-verified ones, which can then be either verified or removed.