PayPal is part of the nonprofit Libra Association, which will oversee the blockchain-based coin, maintaining a real-world asset reserve to keep its value stable

PayPal is cautious about the future of Facebook-backed cryptocurrency Libra, which is slated to debut with the pioneering digital payments firm as part of its oversight association.

International outcry is mounting over Libra—with , governments and regulators railing against Facebook's upstart and questions over how it would be regulated.

The social media giant unveiled plans in June for Libra—which will roll out in 2020—to be backed by a basket of currency assets to avoid the wild swings of Bitcoin and other virtual units.

"It's a non-binding commitment," PayPal investor relations vice president Gabrielle Rabinovitch said Thursday of the California-based company signing on to the Libra Association.

"And obviously, I think there's a lot of work to happen before we get to that point where it becomes something more than just a very exciting idea."

The nonprofit Libra Association, based in Geneva, will oversee the blockchain-based coin, maintaining a real-world asset reserve to keep its value stable.

Facebook envisioned Libra as a new global cryptocurrency, pledging to deliver a stable virtual money that lives on smartphones and could bring over a billion "unbanked" people into the financial system.

Hundreds of billions of dollars are transferred annually between migrants and loved ones in their home countries, and PayPal is a player in that sector.

"The goals and ambitions of Libra are very consistent with PayPal's overall ambitions in terms of serving the underserved; democratizing access to capital," Rabinovitch said.

"So we very much believe in the potential of Libra."