Japan’s Financial Services Agency has unveiled strict collateral requirements for stablecoin reserve assets, setting a remarkably high threshold that could limit which bonds qualify as backing for digital yen instruments. The proposed rules mandate that foreign-issued bonds must carry top-tier credit ratings and come from issuers with at least 100 trillion yen ($650 billion) in outstanding debt, a bar few global entities can meet. The draft standards emerged Monday as part of regulatory notices implemen ...