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I'm trying to make a sendTransaction json rpc call and I don't know how to calculate the data paramether.

From the documentation:

data: DATA - The compiled code of a contract OR the hash of the invoked method signature and encoded parameters. For details see Ethereum Contract ABI

There is no specification how this should be made: the hash of the invoked method signature and encoded parameters

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Yes, there's an Application Binary Interface Specification

The Application Binary Interface is the standard way to interact with contracts in the Ethereum ecosystem, both from outside the blockchain and for contract-to-contract interaction. Data is encoded according to its type, as described in this specification. The encoding is not self describing and thus requires a schema in order to decode.

There are several questions here about it:

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  • Yeah but I'm not trying to communicate with a contract just a simple eth transfer..
    – Tadej Vengust
    Commented Mar 28, 2018 at 7:11
  • That is really easy, data should be empty.
    – Ismael ♦
    Commented Mar 28, 2018 at 14:24
  • So its an none optional paramether but it has to be empty?
    – Tadej Vengust
    Commented Mar 29, 2018 at 18:23
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    Sorry, I didn't express myself correctly, I meant it can be empty. Usualy an empty data is enough, but you can embed any string there. Some application use data to embed a transaction id for example.
    – Ismael ♦
    Commented Mar 29, 2018 at 20:31
  • Sorry, coming in late. Could you invoke another method from a smart contract (using the data field) thus deceiving the transfer the user thought it was signing? I am afraid after signing such a message. Or is it purely informative in the case of this kind of transaction? Thanks
    – Nre
    Commented Nov 29, 2021 at 22:18

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