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I've found some libraries which decode input from transaction, but all of them require ABI of contract.

Can I decode input data if I know only txHash, contract address and input data?

How etherscan does it?

Here is an example: https://etherscan.io/tx/0x42afb58ccd19e5f30c4e41a352cdc99e6e3f5ba05191215123e935dc15f55c93

Input data is decoded, but there is no source code (ABI) for that contract.

P.S. I'm interested more in JS libraries, but programming language is not so important.

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  • This is question is somehow related ethereum.stackexchange.com/questions/7927/… , there's a listing of know signatures at 4byte.directory .
    – Ismael
    Commented Oct 3, 2017 at 16:09
  • @Ismael Thank you! This site 4byte.directory is very useful and it finds signatures for many contacts. I'll try to decode with web3 library: web3.eth.abi.decodeParameters(typesArray, hexString); Commented Oct 3, 2017 at 17:21

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