DDoSCoin is the name of a cryptocurrency that pays users that take part to DDoS attacks against certain servers. The scheme is equivalent to other cryptocurrencies like Bitcoin, with substantial difference that the mining process requests the participation in DDoS attack. The researchers have published a paper titled DdoSCoin: Cryptocurrency with a Malicious Proof-of-Work that details their efforts. DdoSoin is a novelty in the hacking landscape, it leverages on the ability of proving the use of bandwidth to a (potentially unwilling) target domain.”]
Source: http://securityaffairs.co/wordpress/50287/hacking/ddoscoin-ddos-cryptocurrency.html