Which major retailer first implemented a blockchain-based loyalty program in 2016, allowing customers to securely track and exchange loyalty points across multiple platforms?

The retail landscape has been transformed by technological innovations that enhance customer engagement and security. One significant advancement in recent years has been the application of blockchain technology to customer loyalty programs. This secure, transparent system has revolutionized how retailers track, reward, and protect customer loyalty points. Test your knowledge about this groundbreaking retail innovation that merged cryptographic security with customer rewards!

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Walmart with their 'ChainRewards' program
Singapore Airlines with their 'KrisFlyer Digital Wallet'
Amazon with their 'Prime Blockchain Points'
Target with their 'RedCoin' loyalty system