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"The setting of Neptune's Brood is the part of the galaxy that has since been colonized with slower than light travel. A large part of the plot turns on the question of financing such colonization.[2][5] Money is entirely cryptocurrency and is known as "bitcoin", an intentional reference by Stross to the real-life cryptocurrency.[6][7] Money has been divided into three classes: "fast", "medium", "slow". Fast money is ordinary day-to-day cash, medium money is ordinary investment instruments, suitable for use within a single planetary system, and slow money is interstellar investment instruments, understood to take centuries, even millennia, to mature. Slow money transactions rely on a three-way cryptoverification scheme, and so trade at one-third the speed of light." 0 reply
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