France has an application called Bitstack that specializes in Bitcoin savings, and it recently secured a significant amount of funding—$15 million in Series A. The lead investor is 13books Capital, with established investors like YC, Serena, and Plug and Play also continuing to place their bets.

How should this money be spent? There are mainly two directions: one is to continue expanding the market in Europe, and the other is to upgrade the product towards a more practical direction. The most anticipated is their plan to launch a VISA debit card with Bitcoin cashback feature in January 2026, called Stackback.

In simple terms, when you swipe your card to make a purchase, the reward is not points or cash, but Bitcoin. This idea is quite interesting—combining daily payments with accumulating Bitcoin, allowing ordinary people to earn some coins while buying coffee or shopping at the supermarket. For those who want to gradually accumulate Bitcoin but are too lazy to specifically operate on exchanges, it is indeed a good starting point.

The acceptance of cryptocurrency payments in the European market has been increasing, and Bitstack's recent financing and product layout can be seen as timing it quite well.