Which innovative cybersecurity measure was FIRST implemented by a major gaming marketplace to protect users' virtual item purchases and in-game transactions?

In the rapidly evolving world of gaming and virtual marketplaces, cybersecurity has become increasingly critical as players spend billions on virtual goods. From securing in-game purchases to protecting virtual currencies and digital assets, gaming platforms employ sophisticated security measures to safeguard their virtual economies. Test your knowledge about the cybersecurity practices that protect the thriving retail ecosystems within today's most popular gaming platforms and virtual worlds.

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Two-factor authentication using a physical security key (introduced by Steam in 2013)
Blockchain verification for all virtual item transfers (introduced by PlayStation Network in 2015)
Biometric verification for high-value purchases (introduced by Xbox Live in 2014)
AI-powered fraud detection system for suspicious trading patterns (introduced by Epic Games Store in 2012)