Zcash is the first blockchain system to use a zero-knowledge proofing mechanism that offers full payment confidentiality while still maintaining a decentralized network using the public blockchain. As with bitcoin, the total amount of Zcash tokens (ZECs) is also 21 million, except that the Zcash transaction automatically hides the sender, receiver, and amount of all transactions on the blockchain. Only those who have the viewing key can see the contents of the transaction. Users have full control over their own choice of providing others with viewing keys.
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