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Well, that's a tricky one, HAF database will make it easier, as you can always query it however you like, but that might not be a viable solution for you unless you are running your own instance or has a direct access to a database. It is however a great foundation for apps, such as HAfAH, and hivemind (HAF based) that could be used for a new API call that could do that effectively.

I hope the frontends implement this feature using HAF. Maybe just for browsing the contents of the blockchain. I understand that any transactions would be faster going straight to the live chain. (If I understand correctly) I like to check out peoples blog from their first post to see how they develop and having to scroll and scroll can be a pain. Keep up the good work.