Proof-of-work system - Wikipedia, the free encyclopedia
A proof-of-work (POW) system (or protocol, or function) is an economic measure to deter denial of service attacks and other service abuses such as spam on a network by requiring some work from the service requester, usually meaning processing time by a computer. A key feature of these schemes is their asymmetry: the work must be moderately hard (but feasible) on the requester side but easy to check for the service provider. This idea is also named Client Puzzle Protocol (CPP). It is distinct from a CAPTCHA, which is inte
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