“Bitcoin users in need of serious transaction privacy should avoid popular services like Blockchain’s SharedCoin and other CoinJoin implementations, according to a well-known security expert.  Consultant Kristov Atlas, author of the book Anonymous Bitcoin, published a security advisory today saying weaknesses in SharedCoin offered privacy only from ‘unskilled examiners of the bitcoin blockchain’ – and even then, only until more sophisticated analysis tools were made user-friendly enough for the average user to deploy.  Atlas recommended anyone using SharedCoin set the number of cycles to the maximum 10, while remembering that even this did not guarantee 100% privacy.”

http://www.coindesk.com/blockchains-sharedcoin-users-can-identified-says-security-expert/

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