About blockchain ctf, need some advices

[0xDennnnny]

Hello, to whom concern

Recently I'm working on onlypwner ctf challenge.
I completed the half of them (level 3 difficulty ones)

but when it comes to level4, I stuck ...
I can not figure out the answer as fast as before.

I know that I definitely need some knowledge of solidity, evm, related fields.
However I dont know where to start, a little confused and frustrated right now...

If anyone could give me some advices that will be wonderful.
I want to know what should I do to get some knowledge about them.
and what could I do now to sharp my ctf skill ?

If anyone want to, like discuss about ctf or solve some challenge together, discussion together
are also welcome.
need some company :)

Thank you. 🙏

[EngrPips]

Hello @0xDennnnny, I think you should first of all figure out why you couldn't solve the ctf challenge and then do some study to bridge your knowledge gap, then attempt the challenge again.

[0xDennnnny]

Thanks for reply.
Right now I actually don't really know why I couldn't solve the challenge ?
I said I don't know because I tried all the methods I knew to solve it but failed.
So ... I must lack some knowledge! Like you said, I should so some study to bridge my knowledge gap.
and I know that.

I think ... the thing bother me right now is I don't know where should I start to learn that knowledge.
For me, it's like I can't tell where is the key point to solve the challenge

What I'm trying to do right now, is to find some audit example in solodit, try to see is there any similar exploit in the past.
But... I don't know, it's seems not really useful right now... I'm kind of lost direction.

Thanks anyway, really appreciate your reply.

[EngrPips]

What is the ctf about?

[0xDennnnny]

oh, It's Multisig in onlypwner.

( my current probably direction is : ecdsa signature, or msg.data manipulate ... or somthing that I don't understand yet 🤔

[EngrPips]

I advise that you read some articles or posts about Multisig and how they work, read up on ECDSA signatures, and read up on msg.sender in an Ethereum transaction. After you finish all of those studying, then attempt the ctf

[0xDennnnny]

Thanks for the advices!! I'll try on that way. thank you.

[EngrPips]

You are welcome, Friend. Looking forward to hearing back from you on how things play out.