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what is the main difference between Zerocoin vs. Zerocash ? are they the same ? Or two different protocols ? If they are two different protocols, what are similarities ?

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Zerocoin is a proposed extension on Bitcoin to make Bitcoin more private. Zerocoin only hides the origin of a payment, the destination and amounts are still public.

Zerocash is a further extension of the zerocoin protocol which hides the destination and amounts. Zerocash transactions are more compact than zerocoin transactions.

Zcash is an implementation of the zerocash protocol onto a new altcoin. Both Zerocoin and Zerocash were intended for extensions to Bitcoin (they would require a fork). However zcash is just an altcoin (it began as a software fork of Bitcoin) with the zerocash protocol on top.

  • Thank you. Do you mean Zcash and Bitcoin use the same blockchain? (Since Zcash is an independent coin); Thanks – Questioner Sep 12 '18 at 13:42
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    No, they use separate blockchains. Zcash is an altcoin which implements the Zerocash protocol. – Andrew Chow Sep 12 '18 at 13:44
  • A bit off-topic: for anonymity features of ZCash, see also crypto.stackexchange.com/a/64281/36884 – horcrux Mar 20 at 11:54

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