Cipher Digital Inc. raised $810 million from a junk-bond sale to help fund a data center tied to Amazon.com Inc., adding to a wave of riskier debt financing backing the artificial intelligence infrastructure boom.

The threat of artificial intelligence has hammered the debt of some software companies on concerns that their businesses could be upended.

A Cipher Mining Inc. subsidiary is seeking to raise $2 billion in the US junk bond market to help fund construction of a data center tied to Amazon.com Inc.