US exchange traded funds that invest directly in bitcoin have recorded an 18th straight day of net inflows, a record number of days in a row, as surging demand propelled the world's largest digital asset to a record high. Data show that since its launch on January 11, more than a dozen such products have combined net orders of $15.60 billion as of Thursday, bringing total assets to $62.30 billion. Many speculators in the options market expect bitcoin prices to surpass the record set in March thi...