Spreadcoin SPR was developed in July 2014. It is decentralized and the first platform to allow users to create personalized payment addresses. The idea of the SPR team is to prevent the creation of pools and make mining more secure. Every miner has to know the private key corresponding to the coinbase transaction and the whole block, not only the header. This ensures that miners have the power to broadcast the mined block. People can buy and trade Spreadcoin from the following cryptocurrency exchanges: Bittrex, Cryptopia, and YoBit.