Ethereum Stack Exchange
Ethereum Stack Exchange

Questions tagged [ethereumjs]

For questions regarding the installation or use of EthereumJS, a Javascript library that implements a number of Ethereum utility functions.

766 questions
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how to use ethereumjs-tx.js in a browser

I have been trying to use ethereumjs-tx in a browser. I have downloaded the browser builds from here https://github.com/ethereumjs/browser-builds/tree/master/dist This is my code snippet …
masrrew
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loadScript() returns false error

I am using geth and writing a js script and I try to load it using loadScript command, but when I run this command, I get false : loadScript("C:\Users\Sandi\Desktop\Solidity\sol_js.js") false I am not able to load the script. How i should do to…
Sig Touri
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5
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Cannot convert string to buffer. toBuffer only supports 0x-prefixed hex strings

Getting error while creating ethereum raw transaction var rawTx = { nonce: '0x2a', gasPrice: '0x4a717c800', gasLimit: '0xc340', to: '0x73F7Ced8cc9D27DC426210c32fc6d0a40f941eE1', value: '0x2386f26fc10000', data: '', chainID: 4 } …
Ishwar Chandra Tiwari
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2
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Transaction wont commit to a block if I send transaction that is signed by private key that is generated by ethereumjs-wallet

Problem So basically what I am trying to do is to send Transactions that were signed by an account that was generated by ethereumjs-wallet so my node don't keep UTC file and therefore I don't have an issue if someone stealing accounts UTC file. But…
Filip Petrovic
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How to query a uint256 input contract function via Etherscan's API?

I'm trying to query a contract function that takes uint256 as input via Etherscan's API but I keep getting error messages. The format I've realized should be as follows based on this…
Curtis S.
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Error: Provided address "[object Promise]" is invalid, the capitalization checksum test failed, or its an indrect IBAN address which can't be

i want to use the 'set' function ,but the console tell me that i have a wrong ,it also can say that 'set is not a function ',you can see this : import React, { Component } from "react"; import SimpleStorageContract from…
ZHBoKn
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Ask for explanation of some notations in Ethereum opcodes

I am going to implement EVM for my own project, while reading yellow paper, I can not understand some notations, can anybody help me to clarify them: what is µ_i in the picture above
Tai D. Nguyen
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1 answer

How to ensure only physical Smart Meters can update blockchain data?

Hey fellow blockchain enthusiasts! I'm working on a project where I need to ensure that only physical smart meters can update the data on a blockchain-based Smart Contract. It's crucial to prevent malicious users from tampering with the…
Dagens
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etherjs provider without ApiKey?

I'm reading the documentation and I see that they say that it is recommended to have an ApiKey with one of the providers, eg: export const provider = new EtherscanProvider(); https://docs.ethers.io/v5/api/providers/ There is no other way to not…
Aggressive_Tonight_2
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How to edit transaction data of an ethereum transaction? Or in other words, create a manual transaction, for contracts with no front end?

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…
Andrew Stanger
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How to centralize same ERC-20 token to one ETH address using SMART CONTRACT/SIGNED OFFLINE TRANSACTION

Suppose i have same ERC-20 Tokens in 100 ETH accounts. To sell those i have to send the token one by one to ONE mother ETH address. It takes lot of time. I heard there is a shortcut way to do that. To maintain the security i always rely on OFFLINE…
Mobasher
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How to time how long it takes to mine a block?

I've recently created a private ethereum blockchain and would like to time, personally, how long it will take to mine a block in the private blockchain I have created. I'm using the command line/geth JSON-RPC interface, so if there's a way to time…
Elizabeth
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How can I call smart Contract function from server side using ethereum account

I want to call Smart Contract function from server side. How can I call? I want to use nodejs.
Jiro Yamamoto
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EIP150 testBlockchain RangeError: Maximum call stack size exceeded

ethereumjs-vm > npm run testBlockchain TAP version 13 # BlockchainTests # file: ContractCreationSpam test: ContractCreationSpam_d0g0v0_EIP150 ok 1 correct pre stateRoot ok 2 correct genesis RLP functional-red-black-tree/rbtree.js:904 get:…
ponarunkumar
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How to get my private key?

I want to use the ecSign-function in the ethereumjs-util-library. But that needs a private key. So how and where do i get my private key for my wallet?
user2762996
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