Questions tagged [ethereum-classic]

Ethereum Classic is the chain where the DAO rescue hardfork did not occur. This tag is for questions dealing with the differences between the chains, usage of multiple chains, as well as cross-chain interaction.

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Retrieving list of NFT assets using web3 python module

I am new to web3 and am trying to use the web3 python package to crawl the ethereum blockchain for all NFT assets from a particular marketplace e.g Opensea, superare. How do I go about this and are ...
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I ask for your help. (Etherium lost four years ago)

4 years ago, I accidentally sent Ethereum to ETC address. ETC address is my deposit (CA) address of Yobit Exchange Ethereum was sent to an ETC address. Yobit exchange only gives the same answer, and ...
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Struct with bytes32 array property is completly returned in Chome but in Firefox array property are empty [] and single props are returned

I have an issue with returning a struct from solidity smart contract application. Thing is - on Chrome - whole struct is returned, but in Mozilla Firefox - struct is filled just with single properties,...
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error deploying with hardhat- config issue

I'm having error in my config file: Error HH8: There's one or more errors in your config file: * Invalid value undefined for HardhatConfig.networks.rinkeby.url - Expected a value of type string. * ...
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How many NFTs are hosted on IPFS?

Let me start by saying that I am a NFT noob so I apologize ahead of time if any of this is obvious. I'm looking to determine how many NFTs are "hosted" on IPFS as opposed to on centralized ...
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Need your guidance in using mythrill

I am using mythrill for analysing vulnerabilities in smart contract. Source: https://github.com/ConsenSys/mythril How many user request for analysing can mythrill python code can handle at a time ? Is ...
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How can I update my smart contract state when someone sell NFT to aother

I implement ERC1155, in which if someone mints a token I save the TokenId and Address of the address that mint the token. mapping(uint256=>address) minter what I want to do when someone on Opensea ...
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i am getting the following error; SyntaxError: invalid syntax

i am getting this error File "C:\Users\Rishi Garg personal\demos\web3_py_simple_storage\deploy.py", line 156 greeting_transaction = simple_storage.functions.store(13).buildTransaction( ^ ...
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Supported solidity compiler by truffle

Hello I'm working on ethereum project using truffle framework, I want to know what is the latest solidity compiler version supported by truffle.
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Sent ETH to ETC address within Ledger Nano X - Blind Signing Error when trying to Transfer (have read old threads)

I sent ETH to a ETC Leger Address. I have read the thread "Sent ETH to ETC address within Ledger Nano S. Confirmed on Etherscan, but not appearing in Wallet? [closed]" which has a good ...
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geth - error when starting the first node - ubuntu

I try to do the steps from here: https://geth.ethereum.org/docs/getting-started/private-net I run the first commnad: geth --datadir="/tmp/eth/60/01" -verbosity 6 --ipcdisable --port 30301 --...
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make geth fails after cloning ethereum classic repo

After cloning ethereum classic repo, running "make geth" command leads to the following error: cannot load hash/maphash: malformed module path "hash/maphash": missing dot in first ...
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How are updates rolled out?

if an update to Ethereum or any other cryptocurrency is rolled out, how to ensure that everyone in the network is running the same 'version'. Especially if the update is not backward-compatible with ...
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NodeJs library for ETC

What is the well NodeJs library for Ethereum Classic? For ETH we are using web3js, but it doesn't want to work with ETC correctly. Or how can I implement send tokens and estimate transaction's fee for ...
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What's a way of extracting analytics from Ethereum's main net?

I'm kind of newbie in Etherum's world. I'm looking for a way of building an "scrapper" (let's say something to collect analytics from Etherum main net) from scratch. It's totally for ...
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Get Ethereum Classic (ETC) transaction via web3 js

For ETH, I get a transaction like this: const trx = await this.web3.eth.getTransaction(transactionHash); and everything ok. But now I want to get transaction by hash for ETC, and it doesn't work. It ...
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Can you store extra data (e.g. text) within an NFT that is only accessible to data buyers?

I want to create a marketplace. Ideally, I want data owners to mint their NFT into the marketplace. The NFT data will consist of: picture (shown to other people in the marketplace) text data (e.g. ...
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Ethereum NFT minting successful, but still gives this error

I am trying to build a Ethereum NFT minting website where the website users can mint NFTs on blockchain without an external wallet (e.g. Metamask). I asked a question here before and got reply as to ...
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Is the DAO Hack attacker still full of ether?

I'm actually studying what is happened in the DAO Hack for a research and I'm full of curiosity. I read a lot of articles on Internet about this but I didn't found enought informations about what ...
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How can I fetch the username and user id?

I just used the require condition the user id and username already exist at the time of signup so how can I fetch the id and username and put it in the require conditions? pragma solidity ^0.8.1; ...
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Can I set fixed gas price to Opensea-js fulfillOrder method

I am trying to use openseajs library's fulfillOrder method to buy NFT token. And I want to adjust the gas price to prioritize my transaction. Below shows how I do this. I pass the tokenId, ...
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Call to sushiswapRouter.getAmountsOut fails

I am using sushiswapRouter at address 0xd9e1cE17f2641f24aE83637ab66a2cca9C378B9F to find amountOut for swapping a token pair. I keep getting this error: reason: 'processing response error', ...
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Would it be possible to create a fork of Ethereum or Ethereum Classic where only few smart contracts can be deployed after offchain debates(forums..)?

I would like to know if it would be possible to create a Fork of Ethereum or Ethereum Classic where only few smart contracts can be deployed? The goal is to create a fork and launch a brand new ...
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accidentally sent ETC to ETH

pls help I accidentally mistakenly sent ETC to ETH, and I have been reached out to my coinbase and third party and they said they didn't receive it and it showed the transaction details and lost the ...
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DeclarationError: Identifier already declared even with inline function call

I got error in my smart contract, Pool.sol:10:1: DeclarationError: Identifier already declared. import './ERC20.sol'; ^------------------^ Token.sol:10:1: The previous declaration is here: contract ...
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startnode.cmd file not recognized

When I opened my folder mygethnode in VSC. There are only two folders named geth and keystore and 4 json files. .puppeth folder and startnode.cmd file is not there. How to edit the parameters without ...
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How many blocks were reversed with the DAO hard fork?

There are some facts regarding the DAO hack and the subsequent hard fork that can be found everywhere, e.g., that the hard fork happened at block height 1,920,000, that it was undertaken in an effort ...
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I'm not sure if ethminer is working

I followed a guide and got ethminer on 1 single 2070 super I'm not mining anything watsoever, I believe. https://ibb.co/MCVKcZ9
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When Eth Classic was forked off, did the people who held Ether suddenly hold an identical sum in two currencies?

I'm having a hard time understanding forks. What happened to the transactions in the blockchain before block 1'920'000? Are they present in both resulting blockchains, i.e. everybody then had two ...
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Ethereum Keystore Hashcat

I have a keystore file but I can't remember all the passwords. Then I use Hashcat and I try to crack it with my list of words that I made but I don't know if I use the correct commands. hashcat.exe -...
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What's the cause of low hashrate on Radeon RX 580 4GB?

I've just started mining Ethereum Classic with Sapphire Nitro+ Radeon RX 580 4GB and lolMiner. While some people have reported that the hashrate should be about 30 MH/s, on my system it doesn't go ...
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TRANSFER_FROM_FAILED when swapping token for eth with uniswap api

when calling uniswap.swapExactTokensForEth, I get the following error on etherscan: Fail with error: TransferHelper: TRANSFER_FROM_FAILED I see previous posts with this error, though they seem related ...
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I can't access my ETH wallet (made on wallet.ethereum.org in 2017)

In 2017, when I first started to mine, I made a wallet in wallet.ethereum.org (I stopped briefly after, so I have around 2.2 ETH in that wallet). Now in 2021 I tried to go to wallet.ethereum.org but ...
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I'm here to run the official Go-Ethereum repo. How can i do that?

I want to run go-ethereum in my own PC. Is there any instruction about this? How they deployed it?
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2 answers
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how to set a require for a string to not be null

I want to write a require condition for string that string variable could not be null. How to write because string is not taking the != operator function createOrder(address _seller, string memory ...
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Is there a websocket URL in Ethereum classic like in Ethereum?

Can anyone tell me whether or not there is a WebSocket URL to deal with smart contract events in Ethereum Classic especially? I know ethereum supports WebSockets and we can easily listen to events ...
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What are the meanings of `(uint256) (a)` and `(int256) (a)` in Solidity

I came across the following code payoutsTo_[_customerAddress] += (int256) (_dividends * magnitude); What is meaning of (int256) in this line, and is there any possibility of overflow here? Or here: ...
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Execute a function once for each ID

I need to allow the function caller to only execute the function once for each request ID. So I have IDs and for each ID , the caller can only execute the function once. I need help in a way that is ...
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In Ethereum, is it possible for a malicious client to duplicate a coin by double executing a transaction?

Is it possible a scenario in which a malicious client executes two transactions with the same nonce of a specific account and copies and sends coins? Suppose users A, B, and C have the following ...
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Simple question about pre/post hard fork of July 2016

I have searched the messages and, while I did find some info on the hard fork, I didn't see my answer. I believe it is because it is such a simple question. Thank you for any clarification you can ...
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Can we use openzeppelin library to make contracts upgrade-able in ETC test net?

I am trying to develop smart contracts to run in the ETC test-net. Beforehand, I am doing some background research and need to know if openzeppelin library is compatible to make things work in ETC as ...
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Does ASIC miner works in ETH and ETC

I want to buy an ASIC Miner (A10 Pro 6GB) but i have some doubts. Is it good to buy an ASIC Miner in Nov. 2020 for ETH and ETC mining ? Recently I heard that the mining algorithm for ETC is changing ...
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Unable to make private geth node online

I am currently working on building my own private network on Ethereum to build small apps. I am learning as I go so excuse me if this question is very obvious, but I have exhausted myself looking for ...
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In Ethereum what is read tx per second ( not write tx per second )

It is every where documented that how much tx per second ethereum can do (which is for writing) , but I want to know what is possible read tx per second ? and if difference then why
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Action on Ethereum errors

I am trying to fetch the transaction information from Ethereum and ETC, i have encountered the below errors message . outofgas Reversed badjump destination bad instruction. If we have these errors in ...
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What does an Ethereum Client do?

I've developed Smart Contracts using Solidity, and then created a front end for them using Web3js. I used Truffle to to get them to communicate. That's how I tried out a couple of Proof of Concepts. I ...
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2 votes
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Isn't the blockchain size going to be a huge problem in the future? [duplicate]

At the moment the blockchain is already quite large. And since the main idea behind the blockchain technology is to get away from services that provide the information and rather have the information ...
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UnhandledPromiseRejectionWarning: Error: Returned error: The method eth_sendTransaction does not exist/is not available [duplicate]

var Web3 = require('web3') var url = 'https://rinkeby.infura.io/v3/cadc6b0dc5c54720b973b3720eab5584' var web3 = new Web3(url) var RemixContract = new web3.eth.Contract([ { "constant": ...
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3 votes
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is it possible for a Ethereum miner to select transaction for processing based on from or to address?

It is commonly written everywhere that Ethereum miner selects transaction based on higher gas price first, so I want to know is it possible for minter to select transaction to process based on from/to ...
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when iam runing npm run dev it showing me this error, how to solve this [closed]

[![shiva@shiva-VirtualBox:~/sta$ npm run dev StarNotary@1.0.0 dev /home/shiva/sta lite-server ** browser-sync config ** { injectChanges: false, files: [ './**/*.{html,htm,css,js}' ], ...
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