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Questions tagged [testnets]

testnets are an alternative blockchains to be used for testing and development with no value attached

66
votes
2answers
13k views

Comparison of the different TestNets

The Metamask client allows access to three test networks: Ropsten Kovan Rinkeby I'm curious: What are the similarities / differences between them? Which use cases are best for each network Are ...
52
votes
13answers
21k views

How do I set up a private ethereum network?

I'd like to set up a local (private) blockchain that isn't connected to the wider internet so that I can deploy some test contracts. How do I go about doing that?
34
votes
5answers
7k 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 ...
31
votes
6answers
25k views

How to get ether on public testnet?

I am a newbee to Ethereum and doing some research. I have installed the Ethereum Wallet app and synchronized the testnet. However, to deploy my first contract in testnet, it requires some Ether, so ...
29
votes
4answers
4k 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 ...
26
votes
4answers
8k views

How do I decrease the difficulty on a private testnet?

I've created a private test network. On the genesis.json file, I've changed the difficulty to 1. Yet, mining a block still takes hours on my CPU. I suspect that is due to some configuration related to ...
26
votes
3answers
4k views

What is a replay attack?

During the launch of the frontier network, users were cautioned not to reuse keys from the Olympic testnet in order to prevent "replay attacks". What is a replay attack, and why would re-using a key ...
23
votes
3answers
7k views

What public test-networks and faucets exist?

What public test-networks exist and what are their conditions? What are the connection data? How often (if so) are they reset? Does a public faucet exist for this test network? Does a block explorer ...
15
votes
2answers
1k views

What prevents the market from assigning value to testnet ETH?

If enough people mine testnet ETH for testing purposes, difficulty will rise along with the cost of generating testnet coins. In some a circumstance why would the value of testnet coins not rise based ...
15
votes
3answers
5k views

How to make Ethereum mining difficulty static for a private chain?

I have implemented private chain in ethereum but its difficulty level increases by time as a result the mining process slows down. Is it possible to make the difficulty static or disable it in testnet....
14
votes
8answers
17k views

How to get testnet ether?

https://youtu.be/NBwRXpCQta8 I watched this video and followed it. But my account test ether is zero. I used faucet.ma.cx:3000 site too. But test ether is zero.
13
votes
1answer
15k views

How to enable and mine Testnet (Morden)?

I have installed Ethereum Wallet on Ubuntu 14.04. After the installation was completed, I realized that my Testnet (Morden) mode was disabled. Looking in the Develop -> Network menu, the Main network ...
12
votes
4answers
7k views

How to run Ethereum Wallet on a custom chain?

So I downloaded the Ethereum Wallet I know you can use a custom directory by running geth first with the datadir flag set up, and then launching the wallet. But besides a custom directory, I want to ...
11
votes
1answer
690 views

parity Ropsten testnet forked at block 296151?

I am seeing what looks like a fork in the Ropsten testnet at block 296151 (Jan 6, 11:14 PM UTC). Is this expected? My local Parity node (Parity/v1.4.7-beta-f2058bd-20161227/x86_64-macos/rustc1.13.0) ...
11
votes
2answers
2k views

What's the difference between developer mode and testnet?

I just tried running geth in developer mode on testnet. ~ $ geth --dev --testnet F0127 21:07:16.947591 6407 flags.go:467] dev and testnet are mutually exclusive I wasn't aware of the actual ...
11
votes
6answers
11k views

How to create a temporary account for testnet with funds?

I'm a newbie in using the ethereum wallet. After I completely installed and downloaded data for the testnet I create a new account but my new account has nothing (0.00 Eth). It lead to I can't do ...
11
votes
1answer
343 views

Is it possible and sensible to deploy a contract to the same address on Mainnet and Ropsten?

Traditionally when people have deployed contracts for public use they have tended to publish separate contract addresses for Testnet and Mainnet. Often this then requires them to include code to check ...
9
votes
3answers
2k views

What's the fastest way to mine a transaction so I can test contracts quickly?

I am developing a solidity automated test framework in nodejs that uses events/logging extensively. The use of events eliminates (I believe) all the RPC simulators out there. It's also frustrating ...
9
votes
2answers
954 views

Is it possible to preload contracts in the genesis block?

Here's the setup I'm trying to use: A genesis.json with the alloc field set to include code. "alloc": { "0000000000000000000000000000000000000001": { "code": "...
9
votes
0answers
303 views

Peermanager is unable to connect to nodes

I'm following this guide and am trying to create a private network with its own block chain and peers. I managed to install docker following this guide (I'm using a debian 8 jessie virtual machine) ...
8
votes
1answer
2k views

Why does this Oraclize query only works once?

Why this code works one time? First time I get proper random number, but after that I get wallet response "Data can't be executed, so it will use all provided gas" I'm in Testnet. contract ...
8
votes
1answer
2k views

Testnet mining is using too much CPU

I have a private testnet set up on my local machine: geth --rpc --rpcaddr "localhost" --rpcport "8545" --dev --mine --datadir="~/Library/Ethereum_dev" --rpccorsdomain="http://localhost" console 2>&...
8
votes
1answer
839 views

Why are the Rinkeby and Ropsten testnets named after Swedish locations?

Why are the Rinkeby and Ropsten testnets named after Swedish locations? I know what they are but am wondering why they were named this way.
8
votes
1answer
511 views

Testnet First Transaction Nonce

I'm implementing a back end with different Ethereum features. I need to be able to create raw transactions. I've successfully did it using Web3 sendRawTransaction from Node.JS, but I wonder how should ...
8
votes
2answers
2k views

Complete steps to write a hello world on testnets?

I am trying to learn about dapp development, but I'm stuck in what should be the easiest step. I've looked at least 6 different "getting started" tutorials; half of them are deprecated, the other half ...
8
votes
1answer
1k views

Following token tutorial on ethereum.org, get error message “No data is deployed on the contract address”

I'm simply copying the full coin code found in this tutorial to deploy a contract on the testnet using mist, but I get the error message "No data is deployed on the contract address". The contract ...
8
votes
1answer
191 views

Registrar in a private testnet

I've created a test network --networkid="11111" and I was able to create the "greeter" contract as an excercise. Now, I'm following this guide and I am trying to register a name, but with no luck: ...
8
votes
0answers
308 views

What is Olympic, Frontier and Morden? [duplicate]

I see some clients accept the command line argument --frontier or --olympic. Is 'Frontier' more than just a name? What does it stand for? And how does it differ from 'Olympic' and 'Morden'? What are ...
7
votes
2answers
11k views

Ethereum Wallet vs. Mist (vs. Testnet vs. Mainnet)

I'm having a bit of trouble completely understanding the inner workings of ETH and the Ethereum wallet UI vs Mist (when having used testnet), and I need to ask some rather stupid questions to ...
7
votes
2answers
3k views

Mist Testnet error “it seems this transaction will fail”

I am very new to Ethereum, and just working through some early tutorials using the testnet. My version is up to date; the blockchain is also up to date; and I have only one account in the keystore, ...
7
votes
2answers
3k views

geth RPC API to check if geth is running in testnet or mainnet?

Simple question: is there a way to query geth to know if it was launched with --testnet flag or not?
7
votes
1answer
136 views

How to connect AugurProject's ethrpc to a local testnet

I have GETH running a test network, and now I'd like to get AugurProject's ETHRPC to connect. I can't find any documentation on ETHRPC.
7
votes
1answer
1k views

How to import a account from testnet?

I recently traded BTC for 1 Ether using shapeshift.io The transaction was successful, but there is no record of Ether in my local account. Here is the tx reference. I fear that I have made a ...
7
votes
1answer
613 views

When start geth(Ethereum client) First time,showing message like “generating DAG for epoch …” mining is taking too much to start

What i have Case 1. following command line without --dev option (take too much time to start to mining) geth --datadir ~/privateBlockChain1 --mine --minerthreads 1 --networkid 1300 --rpcport 8000 -...
6
votes
4answers
7k views

Getting started: testnet or private? How to get testnet ether? [duplicate]

I have Ethereum Wallet v0.7.3, and was eager to try out my first contract on the testnet, but of course need ether. Is it better to just create a private testnet? Is mining testnet ether feasible? ...
6
votes
2answers
2k views

How should we benchmark transaction per sec?

I'd like to compare the transaction speed of private Ethereum(ex. PoA), Eris and HydraChain. How should we benchmark them?
6
votes
3answers
8k views

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

I want to connect to the Ropsten test-net: // Is there is an injected web3 instance? if (typeof web3 !== 'undefined') { App.web3Provider = web3.currentProvider; web3 = new Web3(...
6
votes
2answers
604 views

In Mist, does setting up a different datadir necessarily mean it runs on a testnet?

I'm running Mist on Windows, and I want to change the datadir because I'm running out of space on the C drive, but I want it to be on the actual Ethereum blockchain. Will I run into trouble if I ...
6
votes
2answers
903 views

Is it possible to get a list of all active auctions on ENS?

On testnet, there is currently a registrar running for first-in-first-served (FIFS) .test domains, which can be directly claimed for 30 days, and the auction registrar for .eth domains, which require ...
6
votes
1answer
1k views

How to connect an ethereum node to a random testnet?

How to connect an ethereum node (eth, geht, pyeth) to a random testnet and what do the network IDs stand for. Are there network IDs I should not use because they are maybe used elsewhere or reserved?
6
votes
1answer
160 views

Can main and test net interact?

is there direct way to make a contract on either the main or test net to communicate with a contract on the other net? This could be generalized as asking if a contract on private chain can ...
6
votes
2answers
381 views

How can developers test time-dependent contracts?

I'm working on a revenue distribution contract that lumps eth by week. In order to test it, I need some way to set the now variable. Is there any way to do that? Using solidity/geth.
6
votes
2answers
4k views

What is the difference between networkid 3 and testnet?

I have geth 1.5.4 installed on my ubuntu box. Here is the geth command line documentation for networkid: --networkid value Network identifier (integer, 0=Olympic (disused), 1=...
6
votes
4answers
5k views

How do I automatically run a geth startup script and get a console?

I would like to start geth using a startup script to automatically unlock the accounts and start the miner, and possibly other tasks (for my test network). I tried the --exec 'loadscript('sript.js')' ...
6
votes
2answers
242 views

Is it possible to use “Oraclize” on a testnets such as “Ropsten” or “Kovan” or “Rinkeby” or even local blockchain such as “TestRPC”?

Is it possible to use Oraclize on a testnet such as "Ropsten" or "Kovan" or "Rinkeby" or even local blockchain such as "TestRPC" ?
6
votes
1answer
475 views

Oraclize API not returning anything in Morden testnet

I use Geth 1.3.6 and a Morden testnet. I am trying to test the Oraclize API for my Ethereum smart contracts. First, I have compiled and deployed the simple smart contracts as DieselPricePeg.sol and ...
6
votes
1answer
876 views

Geth not synchronizing to MetaMask

I want to import my account of MetaMask(testnet) to the geth accounts list. First I copied the private key from MetaMask and saved to a txt file. After that I run this command : geth account ...
6
votes
1answer
309 views

Geth will not start mining in private network!

Will somebody please help me out? I am stuck at this since hours; did the process +3 times, each time deleting the datadir content. Geth still will not start mining!! Specs: Geth 1.8.11, on macOS X ...
6
votes
1answer
657 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.
6
votes
0answers
326 views

testrpc 2.0.0 - cannot find module 'memdown'

Trying to get testrpc (2.0.0) working on an ubuntu virtualbox, and getting this error when I run it: mowliv@u4:~$ testrpc module.js:341 throw err; ^ Error: Cannot find module 'memdown' ...