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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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119
votes
2answers
43k 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 ...
39
votes
5answers
8k views

Ropsten testnet is under kind of attack? What can we do?

For the last approximately 24 hours, Ropsten testnet is under an attack in my opinion. The gas limit is raised to 200m and the attacker was proposing blocks with more than 4,000 internal txs ...
34
votes
4answers
6k views

What is Olympic, Frontier, Morden, Homestead and Ropsten Ethereum blockchain?

I am studying Ethereum and have not been able to figure out the difference between Homestead and Morden. In some docs, it is written that Homestead uses a new algorithm which takes less time. I don't ...
19
votes
4answers
11k views

how to connect "Kovan" or "Rinkeby" from geth

As far as I know, the default test network is "Ropsten" and you can connect to ropsten with following command.Since it is default, when you connect to testnet its "Ropsten". geth --testnet I would ...
7
votes
3answers
18k 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 ...
7
votes
3answers
6k views

Ethereum Testnet mobile app wallet

Is there any Mobile Wallet like Jaxx, but with testnet(like, kovan, ropsten)? Please do suggest me, I am workin on the cryto coin transfer application.
7
votes
1answer
733 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 ...
5
votes
1answer
2k views

How to test RPC port for accepting traffic

I have a fully synced node running in my personal computer with kovan testnet. I want to test if my RPC port is accepting traffic or not. I am using parity as a system service.
4
votes
2answers
2k views

How to sync Kovan (troubleshooting)sn

Parity seems to work and comes up with the green 'homestead' button in the bottom right hand corner. When trying to sync with Kovan after using this video/tutorial for setup: https://www.youtube.com/...
4
votes
1answer
1k views

Geth or Mist do not sync any more [duplicate]

I am new to ethereum but managed to successfully start Geth on 2 of my machines , and could also install MIST. Now, since several days, one of my machines does not sync with the testnet anymore. I ...
4
votes
1answer
2k views

Truffle.js and Kovan/Ropsten

I am trying to use truffle.js and the testnet. I want to test using Kovan an Ropsten. Here is the doc from truffle - networks: { "live": { network_id: 1, // Ethereum public network // optional ...
4
votes
1answer
446 views

Trying to deploy a contract on Kovan testnet with Parity and it's waiting forever for a confirmation

It says it's waiting for a contract deployment transaction receipt and it just sits there and waits. It never moves to the completed stage. It was working fine for me a week ago. What's going on?
4
votes
2answers
3k 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 ...
4
votes
1answer
535 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 ...
3
votes
1answer
3k views

How do i transfer from main eth network to kovan test network in metamask?

I transferred Ether to the main network in Metamask. This might seem like a stupid question, but how do I transfer that Ether to the Kovan Test Network? Cheers
3
votes
1answer
7k views

Where can I get some Kovan Ethers? [duplicate]

I tried to get some Kovan ethers, but all the site/faucets I get revered to by MetaMask don't seem to work. Anyone any suggestions or maybe even some spart Kovan Ethers? My address is: ...
3
votes
1answer
1k 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
3
votes
1answer
285 views

Code for contract interaction works on Kovan but not on Ropsten

we deployed (via remix) the code below where one contract can influence a state variable in the other. For some reason if I deploy the contracts on Ropsten it doesn't work and if I deploy them on ...
3
votes
1answer
2k views

Unable to migrate contracts to Kovan using truffle.js (testrpc and dev chain works though)

I'm having problems deploying contracts to kovan. I'm able to deploy to testrpc, as well as the parity dev chain, but the exact same process fails on kovan. The contract hangs at: Running migration: ...
3
votes
1answer
851 views

Latest Parity asking to create account everytime

I have downloaded the latest version of Parity. Installed it. It started by default and asked to create an account. I created the same and got some ethers from the parity faucet site by requesting ...
2
votes
1answer
25 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 ...
2
votes
2answers
785 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 ...
2
votes
2answers
70 views

I keep getting nonce is too low when using truffle to call functions on contracts even though this works fine on remix.How can I fix this

I keep getting the nonce is too low when running functions with sub transactions on the kovan test net is there a way I can stop this from happening?these sub transactions are making transactions with ...
2
votes
1answer
312 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 ...
2
votes
2answers
220 views

Transaction ordering in proof of authority

In decentralized computation the order of transactions is a big deal. For many smart contracts, the sooner a transaction is called, the bigger benefits for that transaction. In proof of work, ...
2
votes
0answers
102 views

Is there something like "metrics" and "monitor" modules for Kovan?

I would like to monitor some parameters for Kovan and Rinkeby clients. Geth provides a monitor module that works with Rinkeby specifying --metrics when launching the client, and attaching to the ...
2
votes
2answers
436 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 ...
2
votes
0answers
339 views

Parity getting started tutorial not working

I'm trying to do the getting started tutorial from Parity but it isn't working. When running the following command: parity --chain=kovan i get the following error message Cannot read manifest file ...
2
votes
0answers
312 views

How can I connect to Kovan using Ethereumj

I'm trying to connect to Kovan using Ethereumj based on the way that I used to connect to Ropsten. The sample example works, however when I try to do peer.discovery.enabled=true I'm not sure which IPs ...
1
vote
3answers
3k views

truffle deployment - runs out of gas on simple contract

I am trying to deploy the SimpleToken code from the Open Zeppelin project and seem to always run out of gas when deploying it to either Kovan or Ganache. I even specified 4700000 gas in the truffle....
1
vote
1answer
597 views

How many transactions per second can Kovan or Rinkeby Network handle?

Now, Ethereum can handle only 8-12 transactions per second by using PoW Consensus. I know that Kovan and Rinkeby is using PoA Consensus. PoA is lightweight than PoW. So how many transactions per ...
1
vote
1answer
74 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 ...
1
vote
1answer
202 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 ...
1
vote
1answer
965 views

How to connect from Remix to Kovan testnet?

In Remix, there is a Contracts tab, where I can choose the "Execution environment". When I choose "Web3 Provider", I am asked to provide the "Web3 provider endpoint". What should I write there in ...
1
vote
1answer
21 views

I'm connecting to the wrong network but my configuration seems right

Trying to run truffle console I got this typical error: I've checked my configuration and it seems OK to me (I don't know why truffle is trying to connect to 127.0.0.1). Here you can see my project: ...
1
vote
1answer
81 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?
1
vote
1answer
356 views

Specify Token Price

I'm pretty much new on this. But I really want to learn. I just created a contract for mintable token on Kovan test-net. But, I'm getting confused when I try to buy the token, it's always shown x000....
1
vote
1answer
355 views

Parity Development Chain

I am new to parity and wanted clarity on the clarity development chain Is it like testrpc ie. stored in local and not like the testnets (ropsten, kovan and rinkeby) which are simulation blockchains?
1
vote
1answer
21 views

Chainlink "Any API" Returning 0

I want to use the chainlink API features but I can not get the data. When I try to execute requestEthereumPrice function I get "uint256: 0" I am using Kovan test net and metamask. pragma ...
1
vote
0answers
90 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 ...
1
vote
0answers
21 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 ...
1
vote
0answers
25 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/...
1
vote
0answers
112 views

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 ...
1
vote
0answers
379 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 ...
1
vote
3answers
1k 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 ...
1
vote
2answers
156 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 ...
1
vote
1answer
44 views

Event firing before data is actually set [Testnet]

Today I've faced the behavior similiar to this post. Event firing before data is actually set I'm getting events using infura and then checking for the state. I expect to read updated blockchain ...
1
vote
1answer
161 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.
1
vote
0answers
97 views

etherscan kovan testnet didn't work?

It seems that etherscan's kovan tesnet has some problems? the block of etherscan fell behind others!! Is there another kovan testnet browser??
1
vote
0answers
51 views

Parity SMS Verification failed

I have tried to verify my account by SMS method so I can request Kovan ethers. I have followed this video https://youtu.be/99UucFzYCRc. Unfortunately someting have messed up (I have changed ...