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Basically stacking sats means, getting paid small amounts of satoshis (sats) on the internet for things like posting on Hive and getting upvoted. There are various other platforms which pay cryptos for participation and even contributions. Over time these small amounts of crypto grow in value to be a substantial amount (hopefully).

Although sats only means in terms of BTC but I use it to earn any sort of crypto/tokens on the blockchain.

ah ok, thanks for that. It's a good idea!