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I am trying to decode the hex data of a transaction. For testing purposes I am using the transaction that can be found here https://kovan.etherscan.io/tx/0xad76a2d244b66d44415135dedd03a127bbfdf36bf0eee68a7c857f8dff7be7fa

It clearly states that the function is Function: addToCurrentNumber(uint256 _toAdd) hence the input type is uint256 and the original hex value is 0xa934861a0000000000000000000000000000000000000000000000000000000000000005

The decoded value can also be seen as 5.

Now in my code I have the following

use ethers::abi::decode;
use ethers::abi::ParamType;
use ethers::core::utils::hex::decode as hex_decode;
fn main() {
    let vec1 = hex_decode("a934861a0000000000000000000000000000000000000000000000000000000000000005").unwrap();
    let data: &[u8] = vec1.as_slice();
    let result = decode(
        vec![ParamType::Uint(256)].as_slice(),
        data
    ).unwrap();
    println!("{:?}", result);
}

But when I run this, the output is [Uint(76533672992909578901694265460808195815504318440232336607848770502130973802496)] which is not what I was expecting. I was expecting 5.

Am I doing something wrong? Or this is working as expected and I am missing the API?

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1 Answer 1

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Markus Schick - was absolutely right: а function selector is the first 4 bytes of the call data for a function call that specifies the function to be called In your case selector is - 0xa934861a (addToCurrentNumber) the rest is a number: 0000000000000000000000000000000000000000000000000000000000000005

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