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How many CryptoNote based currencies exist today?

Have ring signatures appeared in any cryptocurrencies that are not based on CryptoNote?

How many CryptoNote coins are not using a CryptoNight based PoW?

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There's less than a couple dozen CN based currencies. See http://mapofcoins.com/bytecoin.

Shadowcash tried to implement ring signatures on a Bitcoin code base. See https://shnoe.wordpress.com/2016/02/11/de-anonymizing-shadowcash-and-oz-coin/.

To my knowledge, no non-CN coin uses Cryptonight. -- Oops, I misread that last question, see lethos3's answer to that one below.

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    Thanks for the helpful coin map and de-anonymizing paper. My third question (answered by @lethos3) was about CryptoNote coins using something other than CryptoNight, not about non CryptoNotes using CryptoNight. – Luke Aug 4 '16 at 22:57
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    Yep, I misread, sorry. I pointed to lethos3's answer. – user36303 Aug 5 '16 at 7:07
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CryptoNote coins that do not use standard CryptoNight:

Boolberry - Uses Wild Keccak instead of CryptoNight;

Pebblecoin - Used a POW algorithm named Boulderhash in the POW mining phase, it required 13 GB of RAM to mine but it has since switched to DPOS;

AEON - Uses a modified Cryptonight algo named Cryptonight-Lite.

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    I wish I could mark both answered correct as you both answered different parts of my question – Luke Aug 4 '16 at 22:53

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