This category includes coins that support privacy inherently and is built into the design of the currency. The most popular is Zcash, which uses Zero-Knowledge Proofs (ZKP) to achieve anonymity. It is discussed in detail later in the chapter. Other examples include Monero, which makes use of ring signatures to provide anonymous services.
The next section introduces various enhancements that have been made or are proposed, to extend the Bitcoin protocol.
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