Travel and entertainment is an important sector for American Express and in 2017 accounted for 23% of card spend in the U.S. Its cobrand card with Delta made up approximately 8% of billed business in the same period. Hence it’s no surprise that it already has a blockchain partner in travel.

RocketMiles enables travelers to earn rewards on hotel bookings, and the customer selects their desired rewards program. The hotel site is part of the Priceline Group now called Booking Holdings and also owns, OpenTable and Kayak.