After some digging it seems to be another decentralized virtual currency like bitcoin.
"Ripple credits, aka XRP or ripples, are the units used as a transaction fee to protect the Ripple payment system from malicious attacks."
Previous HN discussion:
"Ripple credits, aka XRP or ripples, are the units used as a transaction fee to protect the Ripple payment system from malicious attacks."
Previous HN discussion:
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