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# System prepended metadata

title: tableau synthèse tom

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# tableau synthèse tom

Article | Maths accesibility | Trust | Benefits | Distance from the PoW solution
--- | --- | --- | --- | --- | ---
Permacoin | 2 | 2 | 3 Use energy for distributed storage | Use the PoW puzzle
uPow | 3 | 1 | 2 Use energy to solve useful problems | Really close except the computed problem
Empty blocks | 1 | 3 | 1 Reduce the energy cost | Does not use the PoW puzzle
