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There are alternatives, Proof of Stake for example, or gridcoin, where the computing power to "mine" gridcoin goes towards scientific projects via BOINC.

• oafitupa 12y ago
  Yeah, there are also bottle caps which can be used as currency! But seriously, don't call those "alternatives" if they are not secure. There is no known replacement for PoW.
  • nctr 12y ago
    Why does Proof of Stake not work in your opinion?