替代性 (FUNGIBILITY)

替代性是任何一個正常運作的貨幣所該具有的功能，當您使用如比特幣這種非替代性的錢幣時，您可以選擇使用混幣或其他種增強匿名性的功能來增加隱私，即便如此，這些匿名的交易紀錄在區塊鏈上還是可以被辨識出是"可疑的交易活動"。這種非替代性的貨幣最後還是會招致審查制度的產生，譬如交易所可能拒絕你可能牽連到可疑交易區塊的支付和存款或是礦工可能拒絕驗證你的可疑交易資訊。反觀門羅幣就直接具有基本的混幣功能，所有的輸出都將是被混淆過的，這都要推功於門羅幣的混幣功能是被動內建於系統中的，甚至可以離線進行混幣！這些交易的輸出結果就像"推諉不知情"的狀態，你無法知道這些錢是在某些交易中被花費掉或沒花費過，這樣非透明的區塊鏈使得所有錢幣都是同等無法分辨的，而門羅幣內建的這種特性也使其夠成為真正的電子貨幣。

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Fungibility is an important property of any functioning currency. You can try to hide your bitcoins as much as you want, if you tried to mix your non-fungible coins using a mixer, coinjoin or another type of "anonymity enhancing feature", these transactions can still be flagged as "possible suspicious activity on the blockchain", even if you are anonymous. Using non-fungible tokens as currency can eventually lead to blacklisting/whitelisting either by governments or through self-censorship. Some examples of these measures could be payment processors or exchanges refusing your tainted coins as a payment or deposit or miners refusing to include your suspicious transaction. Monero will enforce a minimum mixing across the network, so all outputs are mixed by default. This is possible due to the nature of the mixing: monero mixing is "passive" and can even be done offline! Transaction outputs have "plausible deniability" about their state: you can't tell if they are spent or unspent in a certain transaction or not. This leads to an opaque (non-transparent) blockchain making all coins "equal". Fungibility is built into Monero at protocol level, making it real "digital cash"..