Digital assets and currencies
Understand assets, networks and trading mechanics with sources you can check.
Osaifu-Keitai (おサイフケータイ, Osaifu-Kētai), which means "Wallet Mobile", is the standard mobile payment system in Japan. Osaifu-Keitai services include electronic money, identity card, loyalty card, fare collection of public transits (including railways, buses, and airplanes), or credit card. The term "Osaifu-Keitai" itself is a registered trademark of NTT Docomo.