0 - 常数、变量和符号

0.1 重要常数

常数	Description
10分钟	target duration of a sub-slot
32个区块	target number of blocks per sub-slot
16/64个区块	每个时隙的最小/最大区块数量
4608个区块	average number of blocks per epoch
384个区块	average number of blocks per sub-epoch
64个签名点	number of signage points per sub-slot

由上可得以下结论：

隐含的常数	Description
1天	target time of an epoch is $10 {\ \sf min}\cdot\frac{4608{\ \sf blocks}}{32\ \sf blocks}=1440{\ \sf min}\quad (=1{ \sf day})$
2小时	target time of sub-epoch
18.75秒	target average block arrival time is $\frac{10{\sf\ min}}{32}=18.75 {\sf\ sec}$
9.375秒	target time between signage points is $\frac{600}{64}=9.375 {\sf\ sec}$

0.2 重要变量

变量	Description
$D\in{\mathbb N}$	难度参数。 每个纪元重新校准一次，以满足每个时隙（slot）32个区块的目标
$T\in {\mathbb N}$	时间参数（子时隙的VDF步数）。 每个纪元重新校准一次，以满足每个子时隙10分钟的目标

0.3 提示

Objective 0:

We will use blue boxes like this one to mention key objectives we want the design of Chia to satisfy

Design Choice 0:

Green boxes like this are used to highlight important design choices, which often will refer to objectives.

Security Notice 0:

A red box stresses some important aspects required for the security of Chia, and will typically refer to some design choice.