How to edit transaction data of an ethereum transaction? Or in other words, create a manual transaction, for contracts with no front end?

Question

This strikes me as a very stupid question, but I have googled and cannot find an easy answer. I have identified a contract that I want to interact with- I know the function selector and the variables I want to pass- ie everything that I need to know for the transaction data. But there is no front-end layer on this contract so I can't use metamask or similar.

Wat do?

Mikhail Vladimirov · Answer 1 · 2019-10-29T08:59:48.287

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You may use "Write Contract" feature of Etherscan.io: https://etherscan.io/address/0xdb25f211ab05b1c97d595516f45794528a807ad8#writeContract, but your contract has to have verified source code on Etherscan.io and you need to use Web3 enabled browser such as Metamask.

edited Oct 29 '19 at 08:59

answered Oct 28 '19 at 10:44

Mikhail Vladimirov

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This is exactly what I was looking for :) Thanks! – Andrew Stanger Oct 29 '19 at 04:48

score 0 · Accepted Answer · answered Oct 28 '19 at 10:54

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In Remix:

Create the ABI with the skeleton of the contract, for instance in Remix.

Then in NodejJs:

Get the mnemonic or the private key that you want to use to interact with Ethereum.
Create a Web3 instance with a HDWalletProvider to connect to Infura.io.
Create a Web3 contract instance with the ABI and the deployed address.
Interact with this contract instance in Javascript.

answered Oct 28 '19 at 10:54

Xavier Leprêtre B9lab

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I will check this out as well! Thank you – Andrew Stanger Oct 29 '19 at 04:48

How to edit transaction data of an ethereum transaction? Or in other words, create a manual transaction, for contracts with no front end?

2 Answers2