Questions tagged [clients]

tag used for any topics on unspecific ethereum clients which allow interaction with the blockchain and smart contracts.

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41
votes
4answers
19k views

What exactly is an Ethereum client and what clients are there?

Ethereum.org's introductory Command Line Interface tutorial mentions these clients: eth - a C++ client suitable for mining, IoT and contract development geth - a security audited Go client for use ...
35
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6answers
12k views

What caused this error: Attempting to run transaction which calls a contract function, but recipient address is not a contract address

I have a contract and a set of mocha tests. I recently switched from using the ethereum client that comes with truffle (the one you get when you run truffle develop) to the ganache-cli. Somehow, in ...
34
votes
1answer
238k views

How to Mine Ether and use Ethereum on Windows?

Which programs should be installed and what do you need to do to start mining Ether and use Ethereum?
23
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3answers
7k views

Which database(s) do the ethereum clients use and why?

Ethereum clients (such as geth, eth, pyethapp, ethereumj, and ethereumH) download the Ethereum blockchain from their peers and then store a copy of it locally, presumably indexed within some sort of ...
19
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5answers
26k views

How do you stop a running geth node?

I can not figure out how to stop a running geth node without killing the process. I tried to lookup geth help but there is no mention of stopping, halting or any shutdown command. How to shutdown ...
15
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5answers
16k views

Is there a C# implementation available for Ethereum?

Is there a C# / .NET / Mono implementation available for Ethereum to interact with nodes and/or the blockchain?
14
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4answers
5k views

How do Ethereum clients generate unique addresses?

How do Ethereum clients, like Ethereum Wallet or Eth-Lightwallet, generate unique addresses that haven't been used before, and what is the likelihood that these addresses have been used?
13
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5answers
3k views

How to experiment with Ethereum without downloading the entire blockchain?

I want to experiment with Ethereum without having to download the entire blockchain. My ISP limits my bandwidth to 50GB and downloading the ETH chain would consume a lot of that, not to mention the ...
13
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2answers
8k views

How to reduce chaindata database size?

Currently chaindata size is more then 10.02 GB. Is there any solution to reduce the size of stored data? Is there a way to store particular database and keep entirely the functionality of client (e.g....
11
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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 ...
9
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4answers
3k views

Does parity include a console?

I can run geth console to get a command line interface spawned after launching geth. Similar also works for eth. I tried parity console but that didn't work out. ~ $ parity console Invalid ...
9
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2answers
3k views

Is there any working zk-snark implementation (even if experimental) among the existing Ethereum clients?

I've asked that question on some places, got a few answers but I'm still missing the bigger piece. I'd like to experiment with zk-snarks. In particular, I'd like to be able to do something similar to ...
9
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0answers
2k views

geth vs parity - quantitative comparison [closed]

How do geth and parity Ethereum nodes compare in terms of: Speed How long does it take to sync with the main net, in both fast and full modes (if possible) Disk space needs What is the size of the ...
8
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2answers
3k views

Event on Mining of a new block

Does ethereum generate any event whenever a new block is mined on the chain which can trigger a daemon process(lets say java code)?
8
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2answers
3k views

Is there any SPV client for ethereum?

I am looking to move some ETH from an exchange to a wallet for which I control the keys. I don't, however, want to download the whole blockchain. Is there a good SPV client I can use?
8
votes
2answers
2k views

Ethereum light client roadmap?

The Ethereum roadmap makes no mention about when to expect a light client. Anyone has any insights on when we could expect to see a light client that could efficiently run on, say, an Android device?
8
votes
1answer
431 views

How hard is it for Ethereum clients to get on the new fork in case of an attack?

Vitalik Buterin writes: Assuming ~20% participation in PoS and current prices, you could stall or break the network at a cost of ~$7 million. However, unlike PoW, recovery is simpler: Ethereum just ...
8
votes
1answer
5k views

How to connect Ethereum RPC Client to a remote server?

I have Ethereum node running the JSON RPC server on this IP example 136.10.164.134 . Then I want to use a client to push some data. I see this library to make the client. But I can't connect to my ...
7
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5answers
2k views

Can I use Ethereum on my mobile phone?

What are the options to use Ethereum on my mobile (Android) smartphone? Is there a "mist for mobile"?
7
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2answers
4k views

How to switch from Morden to Ropsten?

I installed a v.0.8.7 client and tried switching to Ropsten, following these instructions. Namely, I typed in: dyn906-29:~ sam$ geth -- datadir /Users/sam/Library/Ethereum/testnet/geth/chaindata/ ...
7
votes
1answer
139 views

Will Eth 2.0 be implemented in geth (go-ethereum) or will it run on a new client?

Geth is the official implementation of Ethereum based on the coding language Go. Currently, there are 8 teams that are building Eth 2.0 https://www.coindesk.com/next-gen-buidlers-the-8-teams-working-...
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
2answers
801 views

Generate contract address using nonce

Good day, I was looking at the way contracts addresses are created and it seems that the process is quite deterministic (depends on the nonce). Is there a way to get the address of a contract that ...
6
votes
1answer
2k views

Where does the mist browser store the node log files?

Mist uses to launch it's own client (geth or eth) in the background. Does it store the node's logs? If so, where?
6
votes
1answer
258 views

How to build or install the haskell client EthereumH?

I tried to build EthereumH from this github resource: https://github.com/jamshidh/ethereumH I installed google's git-repo and tried to install at as described in the README. It failes with the ...
6
votes
1answer
2k views

How does ethminer interact with the various Etherum clients (e.g. geth, eth, parity) when mining? Does it affect mining efficiency?

Apologies for the rookie question, I'm very new to Ethereum. I wanted to make sure I understand correctly the distinction between an Ethereum mining client (i.e. ethminer) versus a just a client, such ...
6
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2answers
261 views

Do I need to prepare anything for the upcoming homestead release?

This is a canonical question. What actions should regular users miners and pool operators developers undertake to prepare for the upcoming homestead release which includes a forking mechanism.
5
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3answers
2k views

Writing contracts without fully syncing blockchain

I've read this post and this one and I'm still wondering if there is a way to deploy a contract without fully syncing the blockchain, for example by using a light client. I would like try my hand at ...
5
votes
1answer
2k views

Is there a Javascript client for Ethereum, like Geth?

Ethereum's Github has ethereumjs-lib. It appears to be a collection of modules, but is it also a client like Geth? If so, how can one run this Javascript client?
5
votes
1answer
3k views

How do I host Ethereum on a server?

I recently tried to get geth and solidity up and running on a virtual server I have some free time on. I got stuck trying to build the Solidity compiler due to issues with the OpenGL library. I've ...
5
votes
1answer
748 views

Why is fast sync not working with geth 1.1?

When I run geth --fast I get: Incorrect Usage. geth [global options] command [command options] [arguments...] VERSION: 1.1.0 [...] flag provided but not defined: -fast How do I fix this?
5
votes
2answers
18k views

Are there any other mining clients than Ethminer?

I mine with ethminer on dwarfpool. I use this version: 0.9.41-genoil-1.0.7 Beta for Windows. I would like to try another client if its possible. Is there another client than ethminer? I would like to ...
5
votes
2answers
518 views

Which Ethereum clients/wallets support the ICAP?

The ICAP is a method of representing an Ethereum address with a built-in checksum and in a way that is compliant with most bank software due to compliance with the International Bank Account Number (...
5
votes
1answer
68 views

Ethereum client implementation

I think to better my understanding of the EVM and underlying file system, I want to read through one or more ethereum client implementations and potentially build a client myself. So far I've been ...
5
votes
1answer
279 views

Is it possible to run a client behind an onion address?

It is possible to run a bitcoin client which only connects to onion nodes in the TOR network, like that: ./bitcoind -onion=127.0.0.1:9050 -onlynet=tor -externalip=ssapp53tmftyjmjb.onion Is something ...
4
votes
2answers
1k views

Is geth being deprecated? eth seems to receive so much more development

By checking the github activity, geth seems to fall behind eth. Would love to hear about it's future and maybe something about the why's (likely to be related because it's in golang).
4
votes
1answer
1k views

Why do Ethereum clients download the entire blockchain?

Lets say that I am not interested in mining but instead just interested in one contract and its latest state. Why shouldn't my client discard all the other state on initiation, and also ignore any new ...
4
votes
1answer
606 views

Can geth and eth share the same accounts and blockchain?

It appears when I have multiple ethereum clients installed, that they all have their own data, accounts and even their own copy of the blockchain. Is it possible to share accounts and the blockchain ...
4
votes
1answer
259 views

How does a client interact with a contract already in the blockchain?

I am looking for someone to help clarify the 'stacktrace' of interactions that occur when a client interacts with a smart contract. Clearly, one has to submit a transaction to a miner, who then has ...
4
votes
1answer
810 views

How can I check which network I'm working on?

When I start eth I get the following header: $ eth (++)Ethereum Beware. You're entering the Frontier! [...] I think i followed the instructions for working on a private network (because i just want ...
4
votes
1answer
129 views

Why are nodes sometimes called clients?

Sometimes I see people say the phrase "client" when referring to the node. Why is it called that? Really its not a client, because that depends on the client-server model.
4
votes
1answer
547 views

Is there a BIP38 equivalent for Ethereum private keys?

What is the best practice to encrypt an Ethereum private key? For example, Bitcoin has BIP38.
4
votes
1answer
50 views

Can client updates / upgrades be pushed over the ETH network?

Is it possible for ETH clients to securely receive a live push notification/version update like the way OSX, MacOS does? What are the pros and cons? : ) There could be a contract filter to gain ...
4
votes
2answers
127 views

Calculate how much space can be saved after self-destructing a contract

I want to do some brief analysis to quantify how much one could free when self-destructing a contract. How could I calculate how much space can nodes save when selfdestructing a given contract? I ...
3
votes
3answers
1k views

How to sync pyethapp (python ethereum client) with the mainnet?

I just installed pyethapp. However, I'm unable to sync the blockchain. Here is what I get when I run the client: 0 ✓ user@host ~ $ pyethapp run Failed to import scrypt. This is not a fatal error but ...
3
votes
2answers
133 views

Is web3.js an Ethereum blockchain client?

Reason is that I wanted to know what Ethereum blockchain client uPort uses and someone said it's web3.js. I haven't understood this concept enough since I was expecting something like eth, geth or ...
3
votes
1answer
901 views

Parity installation problem in OSX

During the installation I've got at the end this: Last 15 lines from /Users/maksim/Library/Logs/Homebrew/parity/02.multirust: Compiling serde v0.7.4 Compiling itertools v0.4.13 Compiling bytes v0....
3
votes
1answer
1k views

Dangling hash node ref: too many open files

I'm running two supernodes with the geth client. At peak times they have 500-800 connections and handle around 16GB traffic per hour. This is how I run the node: geth --networkid "1" --identity "...
3
votes
1answer
2k views

How to connect mist to a testnet client?

I'm running a geth instance on the consensys testnet. I started it with the following command: geth --testnet --networkid=2 --bootnodes=enode://...
3
votes
3answers
4k views

How to Unlock account via web3js without geth(web3-extended doesn't work)

Need to unlock account to call contracts functions on client side. So i need to use web 3 or web 3 extanded. But it doesn't work.Method are not availebly. Maybe you know some others ways how to call ...