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What is this and how does it work?

Thanks for your interest. Here is the gist on this:

Normally, by commenting under any HIVE post, we receive rewards if our comments get upvotes and the reward is above the dust threshold. Another system has been developed where an author can share part of his or her rewards with the commenters. The project is designed to encourage engagement within the HIVE ecosystem. Read the announcement post here to learn the details.

To reward the commenters, the author needs to set @commentrewarder as a beneficiary. If someone comments under that post and the comment receives an upvote from the author within 3 days, the commenter will receive the reward. The rewards will be distributed in liquid HIVE & HBD after 7 days.