Spain’s largest bank, Banco Santander, has revealed a $4.3 million investment in Bitcoin. 

According to a Securities and Exchange Commission filing, the Madrid-based bank bought the exposure via BlackRock’s iShares Bitcoin Trust — a total of 129,615 shares. 

The filing is the latest example of a traditional institution seeking exposure to the biggest cryptocurrency by market cap. 

Over the past year, Santander’s digital bank, Openbank, has allowed customers to buy Bitcoin and other cryptocurrencies and began a more friendly approach to marketing digital assets to customers. 

BlackRock’s Bitcoin Trust (IBIT) allows investors to buy exposure to Bitcoin…

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