Blocks
Use the b: parameter to list one or more blocks affected by an action.
b:[block]
Supports multiple (comma separated)!
b:stone will query activities that affected “stone” blocks.
Also see btag.
Negation
As of Prism 4.4, this parameter allows negation. Negating an action will exclude results. It is important to note that unlike Prism 3, the syntax has the exclamation point before the colon. You cannot use a negated parameter with its normal equivalent.
Example: /pr l b!:stone (Queries all blocks except "stone")