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The balance_tracker is a an example HAF app that can be used to plot the historical Hive and HBD balances of any Hive account as it changes over time.

Hmmm, that's interesting. Can it be also used for other transactions? for example hive engine or future Defi stuff?

It could be modified to support it, but right now it only supports 1st layer coins.

Hmmm I like it, special for DeFi stuff :)