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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35 views

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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37 views

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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Ethereum Classic Coins bought from https://classicetherwallet.com. I want to recover or transfer them to another wallet

I bought ETC via website https://classicetherwallet.com/ by generating the wallet in 2017. After that as the market went down. I was diverted and never looked into. However recently i came to know ...
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1answer
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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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14 views

Gas price to deploy contracts in ETC Mainnet

What is the standard Gas price to specify while deploying contracts in ETC mainnet? We can always reference ethereum gas station when it comes to ethereum network. But is there any trusted source like ...
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1answer
23 views

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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2answers
32 views

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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2answers
25 views

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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294 views

Why Titan X VGA card hash rate is to low?

I have a Nvidia GTX Titan X VGA card and I want to try mining Ethereum but I don't know why my hash rate is such low !!! it's something about 2/5 MH !!! I had read somewhere that this card's hash rate ...
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1answer
122 views

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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Using web provider of ethereum classic

Ethereum cluster is providing HTTP_PROVIDER for ethereum classic. But I want to use events of solidity for which I need WEB PROVIDER. What is the WEB PROVIDER of ethereum classic?
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1answer
19 views

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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18 views

How deployment in the ETC network is cheaper than in the ETH network?

What factors differ in deployment & transaction cost in ETC compared with ETH network? I checked the gas for deployment in ropsten and kotti which costs the same at a gas price of 20 gwei. In what ...
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10 views

Local testnet for ETC contracts

What local testnet can be used while developing contracts in ETC? In ethereum I have used Ganache. Similarly, how can I make things work with ganache for ETC contracts, or are there any other options?...
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1answer
25 views

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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2answers
7k views

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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31 views

Transaction is not broadcasting

I'm using Nethereum (.NET MVC project) to register in blockchain, I never had any problems, I always recorded on networks: ETH Mainnet, Ropsten, Rinkeby, Kovan, Mordor and Kotti. However, using the ...
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34 views

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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23 views

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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29 views

Can't unlock account with geth attached to parity on classic chain

I run parity 2.7.2 on Ubuntu with --jsonrpc-apis=all on the classic chain: #> parity --chain classic --light --jsonrpc-apis=all 2020-08-05 15:20:15 Starting Parity-Ethereum/v2.7.2-stable-2662d19-...
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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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38 views

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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1answer
39 views

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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1answer
377 views

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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1answer
388 views

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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91 views

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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2k views

ETC Mining - DAG File to big in Phoenix miner but Claymore works without any complains

I am confused, when trying to mine ETC with Phoenix miner, as I did for a long time, it calls the error: GPU1: Not enaugh VRAM for DAG epoch 329 GPU1 is a RX580 with 4GB, but it is dedicated. I also ...
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2answers
36 views

Is transaction confidentiality achievable in Ethereum currently

I have read about zk-SNARKs on different articles which is written in 2016. So I am wondering if the zk-SNARKs is implemented in Ethereum currently?
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61 views

what is a pseudorandom cache mentioned in ethereum yellow paper

in ethereum yellow paper it says: "There exists a seed which can be computed for each block by scanning through the block headers up until that point. From the seed, one can compute a pseudorandom ...
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1answer
297 views

Total Unique Addresses Count of Ethereum Classic

I need to find an API giving the total number of unique addresses used on the Ethereum Classic blockchain. For example, the following API provides it for Ethereum: https://etherscan.io/chart/address ...
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56 views

Retrieving the first and latest transaction date of a contract

Etherscan offers a time series of ethereum transaction of a contract address. Is there a way to retrieve this data? For example the duration mentioned here https://etherscan.io/address/...
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1answer
38 views

ETC - Negative Balance

So playing around with ETC and wondering how in the world this address doesn't have a negative balance? https://gastracker.io/addr/0x6f1f8a70e2257354e81c306f130f7976dead8e8b First transactions are ...
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2answers
70 views

How do I create an attribute-based access control in my smart contract to control user access and permissions?

For my Master's thesis, I am trying to create a decentralized file storage system using ethereum, solidity and ipfs. I want to code the smart contract with attribute-based access control but do not ...
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1answer
447 views

Is there any working provider for Ethereum Classic APIs?

Provider used for Ethereum is Infura, but there is no any provider for Ethereum Classic. Previously tested Ethercluster endpoint to access APIs for Ethereum Classic, not able to connect with Kotti ...
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2answers
159 views

How to convert string to bytes256 or arbitrary bytes?

I already know how to convert bytes32ToString and stringToBytes32: function bytes32ToString(bytes32 x) public pure returns (string memory) { bytes memory ...
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1answer
275 views

About send Ethereum Classic (ETC) coin

Need guideline for send ETC coin using web3js,As per documented flow I understand we can access all methods same as ETH but I have query regarding set provider for ETC after that I can connect to ETC ...
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2answers
971 views

Is there any testnet faucet for ETC Ethereum Classic Coin?

Not able to get testing ETC from available faucet https://etcfaucet.info/, is there any other faucet or way to get ETC for tesing?
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1answer
107 views

Is there any API to create Addresss and wallet as well as make transfer for ETC (Ethereum Classic)?

There is balance checking, transaction list and transaction receipt getting APIs available for Ethereum Classic (ETC)? Is ETC coin is only available on Ethereum Classic or its listed block explorer ...
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1answer
55 views

Where’s the equivalent of Yellow paper for Ethereum classic?

Ethereum classic performed changes never implemented on Ethereum like on mining. I do expect them to have their own paper for detailing this. But it seems it’s not called the yellow paper… Even on ...
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1answer
111 views

About Ethereum testnet 61 (Ethereum Classic)

I know that Ethereum was forked 2 chains due to DAO hacking. so Ethereum Classic was borned at that time but 2 chains are equal technically. Network number is different between Ethereum(number is 1) ...
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0answers
169 views

Solidity: TypeError: Member “unbond” not unique after argument-dependent lookup in contract super EthGatedMarket

I'm getting this error: TypeError: Member "unbond" not unique after argument-dependent lookup in contract super EthGatedMarket. super.unbond(msg.sender, gatewaySpecifier, quantity); ^----------...
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1answer
69 views

How is the Ethereum Classic gas limit enforced?

According the the Ethereum Classic Technical Reference: For security reasons, the amount of gas that can be purchased and used by blocks is limited. How is it limited? Do miners choose to limit it,...
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1answer
791 views

Web3: web3.utils is undefined

I am kinda new to Ethereum and Web3 so I am trying to implement the Ethereum: Building Blockchain Decentralized Apps (DApps) tutorial. I have already installed web3 and web3-utils. npm view web3 ...
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0answers
32 views

Alternative to decentralize exchange on Ethereum?

Because of the block time lag, The decentralize exchanges built on Ethereum suffers from a Front running problem. Gnosis works on Dutch exchange concept where orders are executed in Bulk eliminating ...
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0answers
73 views

How to calculate the value of mixhash in block header?

As of my knowledge how POW works is When mining the miner will have the hash1 which is block hash and he need to fine the hash2 which is hash of nonce (a random number). So that the root hash of ...
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1answer
40 views

Deleting a value from address to address mapping in solidity?

mapping(address => address) public userpatient; I want to delete a the key value pair from above map,when the patient is discharged.How can i do it.I saw similar question here but it mentioned '...
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2answers
2k views

About Abi Encoder V2

I came across the following code and found the term "pragma experimental ABIEncoderV2". Can anybody be specific in telling what this actually means? //pragma solidity ^0.5.2; pragma experimental ...
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1answer
397 views

How do I verify and query my transaction? (Web3.py + Infura + Remix)

I've used buildTransaction() (which works at Contract.transact()) and I can see my transaction has taken place. (https://ropsten.etherscan.io/tx/...

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