Wu Blockchain reports that French Bitcoin savings app Bitstack has announced the completion of a $15 million Series A funding round, led by 13books Capital, with existing investors YC, Serena, and Plug and Play participating. The new funds will be used for European expansion and product upgrades, including the launch of a VISA debit card with Bitcoin cashback (Stackback) in January 2026. Bitstack states its goal is to become 'Europe's leading Bitcoin savings platform.' https://www.(wublock123.com)/index.php?m=content&c=index&a=show&catid=6&id=52800