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185 votes
Accepted

Comparison of the different TestNets

Sepolia Proof of Work (Ethash) Best reproduces the current Ethereum production environment (PoW) Website: https://sepolia.dev/ Resources: https://github.com/goerli/sepolia Goerli Proof of Authority ...
medvedev1088's user avatar
76 votes

How do I set up a private ethereum network?

Creating a private testnet for Ethereum is actually pretty easy. In recent versions of geth, you don't even need to create your own genesis block, or any other complicated steps (many of the online ...
Adrian Macneil's user avatar
44 votes
Accepted

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

Each network version gets a name (id). Here is an overview. Olympic (0) is also regularly referred to as Ethereum 0.9; it launched early 2015 and was the first public Testnet. Deprecated in mid 2015 ...
q9f's user avatar
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28 votes

Comparison of the different TestNets

There are other (test-)networks as well, as described in this SO answer, copied here with their network id numbers: 0: Olympic, Ethereum public pre-release testnet 2: Morden, the public Ethereum ...
Stan James's user avatar
23 votes
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Ropsten testnet is under kind of attack? What can we do?

Update - 25th March 2017 Ropsten has been revived! We are pleased to announce that the Ropsten testnet has been revived! Thanks to a generous donation of GPU hashpower, the Ropsten chain has ...
Richard Horrocks's user avatar
21 votes

How do I decrease the difficulty on a private testnet?

You can make the difficulty static by modifying the CalcDifficulty in Geth to return a static number. Example: func CalcDifficulty(config *ChainConfig, time, parentTime uint64, parentNumber, ...
eth's user avatar
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19 votes
Accepted

How to enable and mine Testnet (Morden)?

(Hi @phuong, please reply on your progress by adding comments below). Lets go through the steps to get your environment working. We will use the command line geth so we can trace through the issues. ...
BokkyPooBah's user avatar
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19 votes
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Why are the Rinkeby and Ropsten testnets named after Swedish locations?

Morden: a subway station in London Ropsten: a metro station in Stockholm Rinkeby: a metro station in Stockholm Kovan: a subway station in Singapore Testnets are named after train stations as a ...
Miguel Mota's user avatar
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18 votes
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What prevents the market from assigning value to testnet ETH?

The testnet can be reset any time by the Ethereum developers by issuing a new default genesis block. New testnet nodes would run automatically the new testnet. Therefore people do not build any ...
Roland Kofler's user avatar
18 votes

How to get ether on public testnet?

The 2 best ways I found were: 1) Instant: an ether faucet here: http://faucet.ropsten.be:3001/ 2) An hour or two: Switch on Mining from the menu Develop > Start Mining (Testnet only) or Command ...
Benc93's user avatar
  • 393
17 votes
Accepted

Where can I find ERC20 token faucets for testing?

From Weenus 💪 ERC20 FaucetAnnouncing the Weenus 💪 ERC20 token faucets on the Ethereum mainnet, and Ropsten, Kovan, Rinkeby and Görli testnets: Search in your Ethereum blockchain explorer for WEENUS ...
BokkyPooBah's user avatar
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16 votes

How do I set up a private ethereum network?

If you are just testing contracts I would recommend using a lightweight Ethereum node like https://github.com/trufflesuite/ganache-cli. This way getting your network set up is as simple as running: ...
Karl Floersch's user avatar
16 votes

How to get ether on public testnet?

you can get ethers on the testnet simply by using Metamask plugin. here's how: You need beforehand install metamask plugin from here, then follow the steps shown in the following picture : 1-press ...
Badr Bellaj's user avatar
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16 votes
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How to make Ethereum mining difficulty static for a private chain?

Modify the CalcDifficulty in Geth to return a static number, then rebuild Geth. Example: func CalcDifficulty(config *ChainConfig, time, parentTime uint64, parentNumber, parentDiff *big.Int) *big.Int ...
eth's user avatar
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16 votes
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parity Ropsten testnet forked at block 296151?

So, the geth monitoring-node first seems to have imported the same one as reported above: Jan 06 23:29:21 geth-testnet: I0106 22:29:21.064938 core/blockchain.go:1073] imported 1 blocks, 14 txs ( ...
Martin Swende's user avatar
14 votes
Accepted

Why does this Oraclize query only works once?

Thomas from Oraclize here. You probably are having this issue because you are not sending any value along. The Oraclize API calls come at a cost, the small fee we charge is paid in advance when ...
Thomas Bertani's user avatar
14 votes
Accepted

How to connect to the Ropsten test-net using web3.js

You can either run a local node and specify your chain using --chain ropsten when starting geth/parity and connect to localhost once sync is completed or you can connect to infura.io: var web3 = new ...
d9ngle's user avatar
  • 436
14 votes

Using Ganache with an existing MetaMask account

You can import a new account from the private key of a Ganache's test address, not the seed phrase. The private key can be seen by clicking the key icon on the right of an account row in Ganache.
A. Mitani's user avatar
  • 141
13 votes

What public testnets (test networks) and faucets exist?

B9lab's IPFS faucet with command line access B9lab have one deployed via IPFS. this is pretty neat. long description below, here is the one-liner for rushed users: curl -X POST -H "Content-Type: ...
q9f's user avatar
  • 32.9k
12 votes

What prevents the market from assigning value to testnet ETH?

Testnet ETH is practically infinite. The Morden genesis block allocates one address, 1.6e42 Ether. Some Ethereum developers know the private key to this and its primary use is for faucets. Here's ...
eth's user avatar
  • 86k
12 votes

Ropsten faucet not working for me

Here's a list of a couple worth trying, since some might get some downtime or experience high demand depending on when you try: Thinklair MyCrypto Faucet Metamask Faucet Ropsten.be Faucet Some of ...
Preview's user avatar
  • 252
11 votes
Accepted

How can I get USDT/USDC for Polygon Mumbai Testnet?

I've gotten some assets for polygon mumbai here: https://faucet.paradigm.xyz/ Including DAI/wETH/MATIC. Should be able to trade those for USDC/USDT. From a quick search, can trade for USDT on Mumbai ...
Kyle Baker's user avatar
9 votes
Accepted

Mist Testnet error "it seems this transaction will fail"

You can't send ether to this constructor or it will fail by design. If you want the opposite behavior then you specify the keyword "payable" in the function. It helps prevent errant transactions ...
Rob Hitchens's user avatar
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8 votes
Accepted

Testnet First Transaction Nonce

It looks like you are on a testnet, which implements an initial nonce of 2^20 (0x100000). The reason this is used is to prevent replay attacks on the main net, where transactions on the testnet are ...
Tjaden Hess's user avatar
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8 votes
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How to create a temporary account for testnet with funds?

Creating An Account In Ethereum Wallet Start up Ethereum Wallet. Make sure that you are on testnet by selecting the menu Develop -> Network -> Testnet(Morden). On the main page, click on Add ...
BokkyPooBah's user avatar
  • 40.3k
8 votes
Accepted

geth ignoring --ipcpath in Linux with attach and datadir

Try this format: geth --datadir /tmp/geth attach ipc:/tmp/geth/geth.ipc (ipc: after attach) Source: https://github.com/ethereum/go-ethereum/issues/2634
eth's user avatar
  • 86k
8 votes

How to get ether on public testnet?

Update: test networks doesn't use PoW anymore, but PoA. You have to ask money by faucet. Rinkeby PoA: https://faucet.rinkeby.io/ Kovan PoA: https://faucet.metamask.io/ You could use metamask for ...
Ellis's user avatar
  • 2,354
8 votes

Are there Ethereum Wallets (other that Mist) that provide support for test-network

The word light-wallet or light-client can mean a number of things. There is the fast-sync'd versions of geth and parity which reduce the amount of data necessary on your hard drive. There are also ...
tayvano's user avatar
  • 16k
8 votes
Accepted

geth connect to TEST-NET

You need to launch geth console by giving "testnet" or "rinkeby" as an argument - --testnet Ropsten network: pre-configured proof-of-work test network --rinkeby Rinkeby network: pre-configured ...
Sanchit's user avatar
  • 3,502
8 votes
Accepted

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

Here's a link to information on faucets for the Kovan testnet. There are currently four ways listed on the above link to get Kovan testnet ETH: Icarus Faucet (SMS Verified, Automated) Request ...
natewelch_'s user avatar
  • 12.1k

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