How to calculate the scrape URL for a torrent

I've read the Bit-torrent specification and done a number of searches, trying to find out how I can get the seeds/peers/downloaded data from a torrent tracker (using Python). I can calculate the info hash from a Torrent no problem, which matches up with the info hash given by various working torrent applications.

However, when I try to get the information from the tracker I either timeout (the tracker is working) or get empty data, depending on what form I put the URL in: - timeout

I was told that this should be 20 characters long, so took a substring, but this gives empty data. - d5:filesdee

I think I have misunderstood something with how I should encode or make the infohash for the scrape URL, but can't for the life of me see where.

Asked by: Jared406 | Posted: 06-12-2021

Answer 1

You're passing in a hex-character representation of the info_hash. It should be a binary representation. To get unprintable bytes into the URL use URL-encoding:


(I'd also try to avoid encoding the _ in the info_hash parameter... not that it isn't correct, but it's the sort of thing I would expect some written-for-speed trackers to mess up.)

Answered by: Charlie594 | Posted: 07-01-2022

Answer 2

My solution:

import binascii

binary_info_hash = binascii.unhexlify('79b193385de5b967175ca86073670fce0e45a324')
print binary_info_hash



More info: binascii.unhexlify

Answered by: Catherine823 | Posted: 07-01-2022

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