By Byron Kaye SYDNEY (Reuters) – Australia’s stock market operator said it will no longer attempt to rebuild its software platform with blockchain-based technology, one of the highest-profile repudiations of the once-feted concept best known for powering cryptocurrency. ASX Ltd frustrated market participants in November by “pausing” a rebuild of its all-in-one trading, settlement and clearing software based on the decentralised computing concept, after an external review found it had to be largely reworked after seven years of development. The company has since said it is considering options f…