higher difficulty acceptance from the node

[Mota]

I searched around and found nothing in the forum, so here it is:

If one artificially raises the difficulty of the block and finds a valid hash for the higher difficulty, would it get accepted by the node?
Also, I can't wrap my head around the lesser difficulty in some mining pools. How are they accepted if they have lesser leading zeroes?

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[grau]

difficulty is not number of leading zeros, but a threshold number the block hash has to be less.

A block might satisfy a difficulty higher than currently required, and that would be accepted by others. The difficulty for next block does however not raise with that, its just waste of effort (or luck).

[piotr_n]

If one artificially raises the difficulty of the block and finds a valid hash for the higher difficulty, would it get accepted by the node?

No.
It's in AcceptBlock function, in main.cpp

[Mota]

Were in AcceptBlock? It seems I can't find a check against it.

[piotr_n]

Were in AcceptBlock? It seems I can't find a check against it.

It's kind of hard to miss it, but well..

Code:

        // Check proof of work
        if (nBits != GetNextWorkRequired(pindexPrev, this))
            return state.DoS(100, error("AcceptBlock() : incorrect proof of work"));

[Mota]

I saw that, but then it seems that I understood it wrong. Proof of work means for me that it checks if the target is smaller than the last hash given. If I have a higher difficulty (and more leading zeroes) then it should be smaller than the last hash, or did I miss something?

[piotr_n]

I saw that, but then it seems that I understood it wrong. Proof of work means for me that it checks if the target is smaller than the last hash given. If I have a higher difficulty (and more leading zeroes) then it should be smaller than the last hash, or did I miss something?

Well in such case I think you probably only missed the lesson of C programming, where they were explaining the magic behind != symbol

[Mota]

ah. *cough*  I am reading the code from my tv. bad excuse. -.-