What is pre_pow?

Mining
1

I know that the last 4 bytes of it is the secondary scale but what is the rest of it?

2

It’s the prefix of the header that’s hashed to define the siphash keys, so everything up to and including the nonce. See https://github.com/mimblewimble/grin/blob/0b21ee607aae8f57b424bd3696cfa9c5cab55271/core/src/core/block.rs#L338-L351

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3

In very short way: the block header to solve the PoW for including diff and previous block header for example :slight_smile:

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4

does it also have next block’s difficulty or total difficulty? if so how can I get it?

5

Yes; it’s written in https://github.com/mimblewimble/grin/blob/43bd5a56ff0ac6d6c2010eccac763a837ed7d075/core/src/pow/types.rs#L266-L274

You can get it directly as header.pow.total_difficulty

6

how to do this “header.pow.total_difficulty” ?

7

can you please tell the structure of pre_pow like the last 4 bytes is for secondary scale.

8

Last 8 bytes is nonce and 4 bytes before that is secondary_scale,

see also

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