Official Block Hunt3r Discussion

Official discussion thread for Block Hunt3r. Please do not post any spoilers or big hints.

Comments

  • I've been searching for the Tran**** between the two dates since an hour.. it's taking forever yet still nothing interesting
    am i in a rabbit hole?
  • edited August 10

    Type your comment> @ElleuchX1 said:

    I've been searching for the Tran**** between the two dates since an hour.. it's taking forever yet still nothing interesting
    am i in a rabbit hole?

    same :/ it can takes hours, idk am i missing a small hint on the question or something about filter the tran****s this dates


    Hack The Box

    You can pm me on discord sh4d0wless#6154

  • I coded something akin to a binary search algorithm to "quickly" extract the appropriate range of data. Granted, runtime was still a few minutes, but nowhere remotely close to hours! That's just crazy (no offense intended).

    I'm not sure what you guys are doing, but if you're iterating over records one at a time then yeah, you're in for a long wait and a huge headache.

    opt1kz
    https://i.imgur.com/4jXzPqJ.png
    404 Friend Not Found

  • Especially the headache..
    Just a question,what data are you searching with your algorithm?

  • Type your comment> @ElleuchX1 said:

    Especially the headache..
    Just a question,what data are you searching with your algorithm?

    The data you were referring to in your first post. You're on the right track with that. But there's a fair bit of it to go through. I automated the process with code. I'm not sure how I would've done it otherwise. It is an OSINT challenge, though, so maybe there's a way.

    opt1kz
    https://i.imgur.com/4jXzPqJ.png
    404 Friend Not Found

  • edited August 11

    There is definetely a painless way of exploring the blockchain.

    Hint: If you would have to explore an entire blockchain searching for a malicious file, would you use the same approach you're using? Research is the key.

    Pd: you can do it in minutes with the right tools.

  • completely clueless with this one. On Discord, people were talking about using API's and their own codes - but I'm lost as to how to even get started with this one

  • edited August 11

    An interesting challenge, a mix of stego and forensic. I suggest to download geth and run a sync ( geth --goerli ), it only takes couple of hours because this is testnet. Then you can easily query whatever you want againt your local node

    joeblogg801

  • Type your comment> @joeblogg801 said:

    An interesting challenge, a mix of stego and forensic. I suggest to download geth and run a sync ( geth --goerli ), it only takes couple of hours because this is testnet. Then you can easily query whatever you want againt your local node

    You'll need some patience. There's only one peer (seed) and it takes a while to connect to it.

    Deleite

  • Finish,
    I thing that I do not get the smartest path, but I learned a couple of new things.
    Nice Challenge congrats to @Sm4rtK1dz to the challenge, was a huge journey.

  • No hint needed here, the chall description is enough in order to understand what you have to do.
    There are at least three ways of approaching that:

    The worst (mine): automatize all the manual tasks by some scraping. (functional but not recommended)

    The intended: OSINT / Forensics / stego, you not need to understand the blockchain in depth, just a little bit, the basis.
    Search what you need and use it.

    A good practice: Learn the blockchain, learn methods and tools, run your node and make all the query that you want.

    Thank you to @ Sm4rtK1dz, respect.

  • Hi, if someone can DM me. i have found the good bloc, and the data...but impossible to display it

  • Nvm, finished

  • How big is the Görli data you download with geth --goerli?

  • edited August 29

    @balatak said:
    How big is the Görli data you download with geth --goerli?

    You can use another service with api to download only what you need. And it's more quickly.

    Hack The Box

  • The data set is about 5Gb I believe, it takes couple of hours to sync

    joeblogg801

  • Just posting to comment that you don't 'have' to download the full data set - I put off doing this for ages as the comments about having to d/load 5Gb of data put me off. There is a way to remotely query for what you need but you can manually limit the range of data with some very basic trial and error experimentation - this should give you a much more manageable data set. Then you have to think how to search for the type of data you're looking for. There are still a couple of gotchas after that! I found this hard and took me well out of my comfort zone but was very happy when I finally cracked it - thanks @Sm4rtK1dz
    I'd love to see how other people solved this as I bet there are a few different ways.

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