Digital Asset Holdings, a blockchain startup backed by some of the world’s largest banks, said on Wednesday it had developed a platform to allow traders to use blockchain technology without giving out confidential information on their trades. The new platform provides a solution to confidentiality issues holding back adoption of the nascent technology in financial markets, according to a report issued by the company, which is led by former JPMorgan banker Blythe Masters. Blockchain, which first emerged as the software underpinning cryptocurrency bitcoin, is a shared record of transactions and asset ownership that is maintained by a network of computers on the internet.