拔出硬币或标志数确定客户的操作设备的时间，但是在大少数状况下，最小的硬币数量是必要的启动设备。
The number of COINS or tokens inserted determines the amount of time customers have to operate the equipment, however in most instances, a minimum number of COINS are necessary to start the equipment.
制作一个标志要花上数小时。
现时标志通常能实现为计数器(一个序列数)或者时间戳。
Typically, the nonce can be implemented as a counter (a sequence number) or as a timestamp.
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