http://ttevhjjsjxz6uqqcjkbig5cycd7n7xv7cmd6f5fcvrqaaa7f3bj36wad.onion/technology/security/pow/index.html
Is "onetime use" only, i.e, neither legitimate users or attackers can
stockpile to buy the whole venue. Hence, there's no "blockchain" or banks
involved in this special currency system. Generating a single ticket won't consume much resources, but generating many
does, no matter how powerful is the attacker's hardware.