Questions tagged [kovan]

Kovan is a new testnet for Ethereum using Parity's Proof of Authority consensus engine, which is immune to spam attacks as Ether supply is controlled by trusted parties and provides a consistent 4 second block time.

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17 views

Contract is not working in BSC testnet [closed]

I'm using hardhat for deploying and testing my contract (sample ERC20 contract). Main problem is in BSC testnet (I think), because the same code deployed in Kovan testnet is working. Function "...
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1answer
18 views

Is there a decentralized way to intercommunicate between two Ethereum networks?

If I have Contract A deployed to the Rinkeby Test Netwok If I have Contract B deployed to the Kovan Test Netwok Then, can we program the contracts to interact with each other like Contract A invoking ...
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18 views

Not receiving LINK from Chainlink kovan faucet

I attempted to get funds from kovan.chain.link to my metamask address and the money did not come through. I got some errors as seen here: https://kovan.etherscan.io/tx/...
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136 views

List of Token Exchanges Available on Testing Network?

Found Kyber Network Token Exchange on Ropsten so far. Please share if you know more token exchanges available on any testing network for trading Tokens as a test.
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2k views

Sending multiple transactions in the same block with incremented nonces

I need to send 0.1 ETH to 10 unique addresses from the same address at the same time. I am manually incrementing each transaction's nonce, and the transactions are sent successfully. However, each ...
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1answer
124 views

Howto check sync with kovan testnet is complete or not?

I am trying to sync with Kovan testnet, docker run --name eth -p 8546:8546 -v ~/ws-002-chainlink/ws00-docker-geth-ropsten:/geth -it ethereum/client-go:stable --testnet --syncmode light --ws --wsaddr 0....
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28 views

Gas Estimation Error - Swap Contract

I'm working on developing a contract that automatically performs a swap and have been having an issue with the swap function. I finally got the contract deployed on Kovan, but have been getting the ...
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13 views

Contract method works on local but not on testnet

The following method, which works perfectly fine on my local ganache. function someMethod() external view returns ( bool someValue, uint256 lastIndex, uint256 totalTokens ...
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1answer
725 views

Parity Error: Account not found for the current chain (Kovan)

I am having problem starting Parity with a account that I created using Metamask. This account 0x76Eb17471A5fb78EF6768254D1dAEc528ec6b5a8 has received multiple ETH from Kovan faucets. Running the ...
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12 views

How do I get multiple signers for the Kovan testnet?

I am using hardhat + ethers + infura for my contract development and testing, and all has been fine so far. On my local computer, when I run const [deployer, d2] = await ethers.getSigners(); in my ...
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16 views

AAVE Protocol v1 issue on reserve addresses with compound ctoken addresses

https://kovan.etherscan.io/tx/0xa7f5e857d1a9ecb4aca0714b24a70ca0942cc1a656c8e09b6d01bab9af4ec9e5 I am trying to make a transaction from DSProxy (Smart Wallet) on a contract https://kovan.etherscan.io/...
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Issue with `TRANSFER_FROM_FAILED` when calling Uniswap contract - but I am approving the token!

My code is pretty simple function swapForEth(address tokenAddress, uint amountIn, uint amountOutMin, address to, uint deadline) external onlyOwner payable { require(IERC20(...
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2answers
50 views

Exception:Reverted when swap by smart contrat with uniswap

Here is my code pragma solidity ^0.8.2; import "https://github.com/Uniswap/uniswap-v2-periphery/blob/master/contracts/interfaces/IUniswapV2Router02.sol"; contract Test_Swap{ address ...
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2answers
419 views

How to connect these **Remix - kovan - parity**?

I have been trying to connect deploy a smart contract from remix onto kovan chain via parity but kept on showing even after trying with all the rpc flags. if possible please throughly explain the ...
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3answers
896 views

truffle migrate --network kovan issue

When I run truffle migrate --network kovan in the terminal the contract deployment doesn't run. Just: Compiling your contracts...==================== >Eveything is up to date, there is nothing to ...
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341 views

Unable to interact with a contract on Kovan network on Remix IDE

I am working on a project and I have successfully deployed a smart contract on Kovan test network, but for some reason, I am not able to interact with it in JS code. So, now I want to access it ...
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1answer
35 views

'Transaction nonce is too low. Try incrementing the nonce.' while following truffle tutorial

I ran into a nonce error on the last leg of this tutorial : https://www.trufflesuite.com/boxes/flashloan-box I also supplemented the tutorial with this video on yt(fyi b/c some of the code comes from ...
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2answers
241 views

“Invalid Chain Id” on Kovan testnet

I'm attempting to initiate a transaction (transfer of ETH) from my main account to a test account on the Kovan Testnet, but I'm getting the error Returned error: Invalid chain id. from the following ...
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1answer
467 views

Cant find sushiswap router address for Kovan testnet

Can anyone get me a routerV2 address for sushiswap on Kovan? The address given on sushi page is incorrect.Thanks
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12 views

How to get smart contract assertion message thorugh web3.js? [duplicate]

I revert a transaction in my smart contract when a specific condition is met. For instance: function doMoneyLaundering(uint256 millionsOfDollars) public { ... require(...
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1answer
529 views

Contract transaction couldn't be found after 50 blocks in Kovan

When deploying contracts on the ledger I faced with issue Error encountered, bailing. Network state unknown. Review successful transactions manually. Error: Contract transaction couldn't be ...
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1answer
71 views

Transaction not showing on Kovan etherscan even after its status showed transaction mined and executed successfully

I have my contract deployed on Kovan Testnet and from remix IDE I called one of the functions of my smart contract through remix itself. Now, the status of transaction shows "transaction mined ...
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Is kovan network died? [duplicate]

Kovan's network faucet is inactive. I have only found a few "faucets" that give me 0.01 or 0.1 test Ether every 24 hours... https://faucet.kovan.network This is the Kovan Token contract. Its ...
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1answer
337 views

How to verify my account in order to use the Kovan testnet?

I am new to parity and kovan-testnet. I have to verify my account in order to receive keth. I am confused as to where to execute the following code: curl http://github-faucet.kovan.network/url --...
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2answers
144 views

OpenZeppelin contract not working on Kovan testnet

I created a simple smart contract using OpenZeppelin and deployed the contract to the Kovan testnet. However, when I send KEth to the contract using MetaMask, nothing happens (I believe the buyTokens ...
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14k views

Where can I find test-ether for the Kovan Test Network?

I have tried getting some using my github account but my account got flagged immediately and the program wasn't recognizing my account (Since it wasn't public due to being flagged). Are there any ...
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2answers
69 views

Deploy contract to Kovan with brownie and infura

I'm trying to simply deploy a smart contract in Kovan network, i've used the export of the ID using export WEB3_INFURA_PROJECT_ID=xxxx but i'm getting this error ValueError: The method ...
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2answers
216 views

Seamless process to obtain test ether from faucet? [duplicate]

I am unable to successfully "Buy" Ether from a faucet for Ropsten or from Kovan. Is it me or do most people have issues setting up a testnet using Ropsten and/or Kovan? Can anyone help me ...
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1answer
176 views

Chainlink Price feed Main contract points to Kovan. Why? [closed]

I'm setting up price feeds with Chainlink. https://docs.chain.link/docs/ethereum-addresses#mainnet This page has sections: Mainnet, Rinkeby, Kovan. Under Mainnet.. Clicking a pricefeed takes me to .. ...
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118 views

Deploying ERC20 Error

I'd like to deploy follow "StandardERC20" token to kovan test net using Truffle. I want to deploy same contract like "https://etherscan.io/address/...
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1answer
59 views

ETH transactions to presale contract keep failing

I'm trying to send some ETH to a presale smart contract on Kovan. Allowance has been set with presale address as a spender - with the exact same amount as the tokens allocated in the presale contract. ...
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18 views

BlankToken Transaction

So i deployed my smart contract on Kovan Network using Remix IDE, i after successful compilation I added the arguments of the constructor to create the token, it deployed successfully but the issue ...
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1answer
738 views

false Transaction mined but execution failed

I was trying to deploy my smart contract to Kovan test network using Remix IDE,although it compiles successfully but when I try to deploy it I get this error message "false Transaction mined but ...
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40 views

Deploying MakerDao on local testnet

So I've been trying to do this for days now, and It says I have to configure ~/.sethrc and change the C, --chain to testnet. But I don't know which github repo to clone and do all of this on. There is ...
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25 views

How to change contract interactions to kovan?

I am using newest web3 v1.2.4 const Contract = require('web3-eth-contract'); Contract.setProvider(INFURA_KOVAN_HTTPS); const contract = new Contract(CONTRACT_ABI, CONTRACT_ADDR); I have that code and ...
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2answers
38k views

Comparison of the different TestNets

The Metamask client allows access to four test networks: Ropsten Kovan Rinkeby Goerli I'm curious: What are the similarities / differences between them? Which use cases are best for each network ...
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327 views

Mocha timeout when running truffle test. Works fine on ganache, not on public networks

This is the error I get when running truffle test --network kovan: 1) "before all" hook: prepare suite Error: Timeout of 120000ms exceeded. For async tests and hooks, ensure "done()" is called; if ...
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1answer
79 views

How can I obtain testnet REP for use on Kovan?

I would like to test the new version of Augur on the Kovan testnet. Where can I obtain testnet REP in order to do so? I found https://faucet.kovan.network/ for Kovan Ether (KETH) but cannot find ...
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1answer
71 views

Who is 0x093a0ed738b65ed34f2a37a2d44c5e3cd0d0dd45?

I was working with ethereum using: - solcjs web3 truffle public no firewall kovan node (parity) and MultiSigWallet.sol from https://github.com/gnosis/MultiSigWallet And when I checked my wallet in ...
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1answer
28 views

How to sign a erc20 contract call with key using web3

I am making a call to the Dai contract on the Kovan testnet to facilitate transactions between any two addresses entered as input. I was able to successfully make read calls but I realized I needed to ...
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1answer
72 views

web3.eth.defaultChain returns undefined

Hi I am trying to make a call to the Dai contract in the Kovan testnet using web3.js and have to set the value of web3.eth.defaultChain to 'kovan'. The docs state that the default value for web3.eth....
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1answer
69 views

How to handle events for testnet and mainnet?

I know how to handle events using personalised blockchain using ganache, can anyone tell me how to handle events in Kovan,rinkeby testnets?
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1answer
53 views

truffle exec scripts/seed-exchange.js --network kovan

I've been running into an error when I attempt to seed my exchange/contracts on the kovan test network. Any help would be appreciated. Using network 'kovan'. Token fetched ...
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1answer
22 views

ETH transfer to MultiSig contract keeps on getting reverted

I am creating a MultiSigWallet contract. I compiled and deployed the MultiSigFactory contract to kovan network. But when I transfer funds to the contract it gets reverted, as shown on Etherscan.
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39 views

web3.js function contract.once() not working on Kovan, but working on ganache

I am subscribing to an event (just once, queued after an update) of a contract to reload the data like this on my react frontend: const instance = new web3.eth.Contract(abi, address) instance.once( ...
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88 views

Is it possible to use ganache blockchain when I deploy my web app in heroku? or should I deploy the contract first to a test network?

const web3 = new Web3( new Web3.providers.HttpProvider( "https://kovan.infura.io/v3/INFURA_KEY" ) ); const abi = JSON.parse( '[ { "constant": false, "inputs": [ { "internalType": "string", "...
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1answer
20 views

Balance returning zero after sending KETH to it

I have sent the following transactions to the account 0x2D76d8729F9Cfa5bC3CEba8a504400FE30bb53D2: 0x8667bd1859a5ccc99bcc77b38c5453195bf32b308b4038ae409b47b002546344 ...
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1answer
191 views

Deploy smart contract on Ropsten, Kovan

When I deploy my truffle smart contract on test networks like Ropsten and Kovan, can I interact with it using multiple PCs at once simultaneously? And will the data updated from one PC be visible on ...
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1answer
28 views

How to get exchange rates for testnets?

I would like to see what a PETH on Kovan is worth in DAI. How can you look for exchange rates on testnets?
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1answer
229 views

Difference between Kovan and Rinkeby? [duplicate]

I understand that both the Rinkeby and Kovan testnets employ the Proof of Authority (PoA) consensus algorithms. I also understand how PoA works. However, I still dont understand how Kovan and Rinkeby ...