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I have a question, what if I have a simple contract that has a public function "give something to this adress" and that will be called from a website

I will put it on-chain but will not verify it nor publish the abi or source code...

So, is there a way someone can decode the bytecode generated for my contract? Is there any way they can generate their own abi? And the last question: Can someone access the abi that I use on my webpage?

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  • Nobody knows? I think the problem will be when they actually come to the webpage and download it since there will be the ABI. But I can be wrong so please I'll apreciate if you help me. – Michael Narper Jul 13 '18 at 17:03
  • Thx for edit 😉 @chenmunka – Michael Narper Jul 13 '18 at 17:10
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Solidity code is compiled into EVM bytecode. All compiled code can, at least in theory, be reverse-engineered.

Reverse-engineering any compiled code gives us the basic functionality in a very unreadable format (it's optimized, minimized and whatnot). Some more info can be found here: How can you decompile a smart contract?

Having spent a minute googling the issue, it looks like you can't get the ABI from just the bytecode: Can you obtain the ABI of a smart contract using the contract address and contract code? and How do you get a json file (ABI) from a known contract address?

Anyway, as a rule of thumb, don't assume ANY information you put into Ethereum blockchain to remain secret (unless it's encrypted in client-side and not decryptable in the blockchain).

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  • Thanks a lot! I'll be careful. Do you know if someone can get the ABI if he downloads my website? Assuming I use Web3.is i.e I put the ABI on the website? – Michael Narper Jul 13 '18 at 19:41
  • Well if the ABI is on the website publicly then they can get it. But you cuold hide it somewhere within your backend I guess. – Lauri Peltonen Jul 13 '18 at 20:10
  • Yeah I'll try, however, thanks man, I appreciate it! – Michael Narper Jul 13 '18 at 23:32

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