Mastercard (MA) is considering making a strategic investment in blockchain infrastructure firm Zerohash after acquisition talks collapsed when the crypto company opted to remain independent, according to a person familiar with the matter. Fortune reported in October that the payment processor was in late stage talks to buy Zerohash, and could pay as much as $2 billion for the firm, which provides custody, settlement and fiat on-/off-ramps so that fintech companies and brokerages can offer digital assets wi ...