https://blockblog.fr/zcoin-lance-le-protocole-sigma-sur-le-reseau-decede-progressivement-de-zerocoin-cryptoninjas/
https://www.bitlovin.com/summary/zcoins-new-sigma-release-and-what-it-means-for-privacy
https://www.chainnode.com/post/360955
https://www.kriptoarena.com/zcoin-yeni-protokolunu-bugun-sunuyor
https://coinwhalenews.com/news/xzc/n/xzc-news-we-are-happy-to-announce-that-zcoin-xzc-has-completed-its
https://www.xcong.com/subjects/1007662
https://cryptoswan.org/news/38765
https://www.americancryptoassociation.com/2019/07/30/zcoin-launches-sigma-protocol-on-mainnet-phases-out-of-zerocoin/
