Noirscape uses NFC (Near Field Communications) technology to add some fun to the signing in process. A detective ID card is among the items that will be included in the boxed version of the game but they’ll also be available via the future website and onlin merchandise store.
NFC is a tiny, low-cost, batteryless radio transmitter which allows app developers to embed the featherweight, waferthing device into clothing, toys, posters and just about anything else. In my case, I am using a business card format. The actual NFP cpmponent is inside the plastic and is only about an inch in diameter. For the purpose of my testing I have created my own version using card and a stick’on NFP emitter.

Near Field Communication (NFC) is a standards-based short-range wireless connectivity technology that makes life easier and more convenient for consumers around the world by making it simpler to make transactions, exchange digital content, and connect electronic devices with a touch. NFC is compatible with hundreds of millions of contactless cards and readers already deployed worldwide.
https://nfc-forum.org/what-is-nfc/ [01/04/21]
The ID card for Noirscape contains a unique reference code that may only be used once and is used in conjunction with anonymous sign in through Google Firebase integration. It is a gamification feature rather than a security element. ALthough there are plenty of possiblities for future feature development; inlcuding ‘friending’ other participants in the realworld by allowing one another to scan each other’s card.