KDDI and Hitachi pilot finger vein biometrics for redeeming coupons in stores — KDDI (translation) — “The user can authenticate himself by holding the finger registered on the authentication infrastructure, so it is not necessary to present the coupon at the store, and the coupon can be used even without the smartphone… Since coupon usage information recorded in the blockchain is extremely difficult to tamper with, it is easy to share coupon usage history securely and reliably between KDDI and affiliated stores, and payment according to the number of coupon users is highly accurate.”