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There are so many privacy techniques, lets take a brief look at how each of them works from a higher level, looking at Zcash, Monero, Dash, Mixers (General)


Monero works by using ring sigantures to achieve privacy, ring signatures dont require a trusted setup and provide reasonable privacy guarantees, ring signatures work by introducing the conecpt of rings, lets say there are 10 transactions with senders 10 and 10 receivers, what a ring signature does is create a signature such that the probability of any transaction belonging to a single sender is the same as anyone else, as you might have already thought about, the ring only works if the values are the same, otherwise because of the varying amounts, it can break down (however with RingCT, varying amounts work, more on this later). You can read more about it here:

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