1. https://www.rbc.ru/crypto/news/5c7e7c339a7947edc301cbc92. https://www.appbrain.com/dev/Brave+Software/3. https://www.ibm.com/security/services/blockchain-testing4. https://www.thehindubusinessline.com/news/india-a-key-hub-for-illicit-drug-trade-use-of-darknet-cryptos-rampant-un-body/article26440255.ece5. https://www.investinblockchain.com/will-cryptopia-finally-reopen-after-16m-hack/