Topic: Calculating Difficulty from Getwork "Target" Value (Read 1413 times)

BinaryMage

hero member

Activity: 560

Merit: 500

Ad astra.

Simply swapping to little-endian does the trick.

For reference:

Code:

>> target = "00000000000000000000000000000000000000000000006e8102000000000000"
>> target = target.decode('hex')
>> target = target[::-1]
>> target = target.encode('hex')
>> maxtarget = "00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
>> difficulty = int(maxtarget, 16) / int(target, 16)
>> print difficulty
6695928 # Slightly different because I'm using the non-truncated maximum target

BinaryMage

hero member

Activity: 560

Merit: 500

Ad astra.

According to the wiki, difficulty can be calculated by dividing the maximum target by the current target.

However, I'm unclear on how exactly the target value returned from a getwork call is encoded (and more importantly, how it should be de-encoded to calculate difficulty using this method).

Do I simply swap it to little-endian (and if so, how?), or is there a more complicated process?

Example code (Python) using the current target:

Code:

>> target = "00000000000000000000000000000000000000000000006e8102000000000000"
>> target = process(Target)
>> maxtarget = "00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff"
>> difficulty = int(maxtarget, 16) / int(target, 16)
>> print difficulty
6695826

Any advice would be appreciated.

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