China’s first blockchain-based electronic invoice for a subway ride was issued at the Futian Station of the Shenzhen Metro, local finance publication Securities Daily reports on March 18.

Shenzhen is the first economic special zone in China. The e-invoice function is the jointly developed project of the Shenzhen Municipal Taxation Bureau and Chinese tech giant Tencent, which provided the blockchain technology back-up through its 1 billion user social media platform WeChat.   

https://cointelegraph.com/news/china-shenzhen-issues-countrys-first-subway-electronic-invoices-backed-with-blockchain