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Non-interactive Proof of Space Time (in short, NiPoST) is a proof, given by a Smesher, that the committed disk space was used for the Spacemesh protocol over the designated period of time. The proof is self-contained (requires no interaction with the proving Smesher). It combines the PoST and PoET algorithms. Each Smesher needs to publish a NiPoST in order to become eligible to Smesh blocks, and keep on publishing NiPoSTs to maintain their eligibility.