This market will resolve to YES if there is an official ceasefire agreement, defined as a publicly announced and mutually agreed halt in military engagement, between Israel and Hamas on or before November 30, 2023, 11:59 PM ET. Otherwise NO.

The resolution will be based on official government announcements from both Israel and Hamas, or reports from credible media sources. An official ceasefire agreement requires public recognition by both parties. Any form of informal, unratified, or verbal agreement will not be considered an official ceasefire. The ceasefire must last 48h and to have begun before the resolution date (if the ceasefire begins on the resolution date, for example, this market would resolve to "Yes" if the ceasefire continues for 48h).

Update:

As stated above "The resolution will be based on official government announcements from both Israel and Hamas, or reports from credible media sources." and that will form the primary basis for determination of whether the ceasefire lasted at least 48 hours. If such sources are in consensus about whether the ceasefire lasted 48 hours then that should be simple enough; it only gets complicated if they disagree.

I think that the end of the ceasefire should be counted based on whether the involved parties think the ceasefire is still in effect. I agree that isolated incidents of violence would not count as ending the ceasefire unless the parties think it counted as ending the ceasefire. I'm going to leave determination of edge cases up to https://polymarket.com/event/israel-and-hamas-ceasefire-by-nov-30