Bitcoin has been one of the best performing currencies this year. It has attracted the savings of many , as assets with high investment returns remain scarce on the mainland. Supporters of the new method include Microsoft, the bitcoin exchange Coinbase and a variety of other bitcoin proponents who would like to see the currency used more widely in commerce. Reformers had threatened to stop recognising transactions confirmed by miners who hadn't adopted the upgrade. Though the change is designed to improve capacity on the increasingly clogged network, some miners had objected because it could reduce transaction fees they collect.