The id of an original post being reblogged. Often a post being reblogged is, itself, a reblog. There may be a chain of reblogs, all the way back to the original post. The id here refers back to the original post.
Alternatively you can use tumblr.reblogged.from.id to filter on all reblogs from a user who may be the author of the original post or may just be reblogging it from the original blog or from another reblog.
- Filter for all reblogs of an original post:
tumblr.reblogged.root.id == "12345678900"
Target service: Tumblr
Always exists: No