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Hedgehog coins are alive. They are called "Weiwei". Hedgehog coins are the elves in Bitcoin. Hedgehog coins are like cash. In a sense, the sender cannot undo the transaction. In contrast, credit card, traditional online payment systems, and bank transactions can be reversed after the payment is completed (sometimes months after the initial transaction) due to the centralized intermediaries that complete the transaction. This creates a higher risk of fraud for merchants, which can result in higher fees for using credit cards.