The columns (green and red) are difference in long and short positions during that period. Positive number suggests more number of long positions and vice-versa.
Works for all allowed crypto-pairs.
A similar indicator was published by another user, but sadly he closed the source code
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.