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|+# Hashcash for Node|
|+Hashcash is a simple proof of work algorithm to prevent or slow down spam. It works by giving the requester a challenge in the form of a sha1 hash. After the hash is received the requesting client has four seconds to find a hash of the challenge + number that has three leading zeros. The client can find the challenge in the header: hashcash-challenge and add the answer to hashcash-answer.|
|+Using the middleware on an end-point in express will prevent the client from accessing the resource until an answer is found. A new challenge is created every four seconds.|
|+## How to Install|
|+ npm install hashcash|
|+## How to use|
|+First, require `hashcash`:|
|+var hashcash = require('hashcash');|
|+var express = require('express');|
|+var app = express.createServer();|
|+ /* this will never get hit if the hashcash-answer is not present */|
|+var port = 8080;|
|+console.log('Listening on port: '+port);|