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Bitcoin faucet is a World Wide Web website that gives out "free" bitcoins (BTC) in exchange for doing a simple task, such as clicking on an advert, solving a CAPTCHA, or viewing a webpage for a certain amount of time.〔(【引用サイトリンク】url=http://www.macobserver.com/tmo/article/get-free-bitcoins-with-8-website-faucets-that-really-pay )〕 There are also faucets that dispense alternative cryptocurrencies. ==Operation== Faucets usually give tiny amounts that typically fluctuate according to the value of bitcoin. Typical payout per transaction is less than 1000 satoshi,〔Named after Satoshi Nakamoto, ''satoshi'' is the smallest unit of bitcoin. 1 satoshi equals 10−8 BTC.〕 although many faucets have random larger rewards. Normally faucet saves up these small individual payments in its own ledger, and they add up to make a larger payment that is sent to your bitcoin address. This is to reduce mining fees. Some faucets use immediate off-blockchain transactions, which have no fees. (Bitcoin faucet rotators ) can 'rotate' through a large list of faucets by clicking a button on a single websites, meaning more sites can be visited than entering the URL of site after site. The website earns money through a referral system for each website visited. Faucet rotators can also prioritize faucets by their level of average payout and will only visit sites if the time limit in between payouts has been reached. The business model of bitcoin faucets is to get advertisement revenue from banner ads and distribute only portion of that money to users. A time limit is imposed between payouts to stop bots, human CAPTCHA solvers in third world countries, or avid users performing repeated withdrawals.〔http://bitcoinaffiliatelist.com/bitcoin-faucets〕 As bitcoin transactions are irreversible and there are many faucets, they have become targets for hackers stealing the bitcoins.〔http://gavintech.blogspot.fi/2012/03/bitcoin-faucet-hacked.html〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bitcoin faucet」の詳細全文を読む スポンサード リンク
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