All Questions

I am experimenting with the geth-android library with light-client and in-process node from @karalabe. I could successfully sync with the testnet node from @phonikg, unfortunately this one is down now....

I am trying to follow this example: https://github.com/ethereum/pyethapp/wiki/The_Console However, at the point where I should compile the code, I get an error: In [34]: print c contract NameReg{ ...

I have a node js process that creates a web3 websocket connection, like so: web3 = new Web3('ws://localhost:7545') When the process completes, it does not exit, but rather hangs forever with no ...

Geth suddenly stopped working for me - when I run it on verbosity level 5 I get repeating error messages like the following: dyn dial conn 120.27.122.174:30303 faild enc handshake: EOF Any thoughts ...

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) ...

What were the consensus issues during the Constantinople hardfork in the Ropsten testnet? One noted consensus issue is: geth and parity have been in noticeable disagreement regarding block ...

Hello ladies and gents, Crypto Kitties got me thinking, and I was wondering if it would be possible to host a PoW (or even PoS) Plasma chain, in which the tokens rewarded to participants are non-...

On web3 0.20.1, I am using Infura to deploy a contract to Rinkeby. This probably requires me to add a wallet to web3.accounts to provide the gas needed. When I ran the following nodejs code, Web3 = ...

I'm using Remix and connecting to Testrpc via Metamask. I can successfully launch contracts to testrpc, but then it hangs on the subsequent calls that Remix makes to the public methods (Remix says "9 ...

I'm starting from square zero, sorry. I'm just trying to get a javascript console up and running so that I can learn more about ENS: http://docs.ens.domains/en/latest/userguide.html#resolving I've ...

I am trying below code to write Voting Contract referring to Solidity documentation pdf. Code compiles without error but I am getting below error while deploying. writing Ballot to app\meta\Ballot\...

I'm looking for more information or resources on how to run a private chain with ethereum with multiple nodes that would work in production and would only be accessible to my users/network. I know ...

According to the Quorum roadmap (which is over a year old now) the team at JPM was planning to add a feature whereby additional parties could be given rights to view private transactions after those ...

truffle version = 4.1.4 truffle unbox drizzle truffle compile truffle migrate npm run build npm run start this gets me this error: Truffle Drizzle-box fails with TypeError: (0 , _drizzle....

Problem I am trying to send some transactions to my private chain, and all transactions are getting failed. I am receiving this error: Error importing transaction: Transaction(InvalidChainId) ...

As mentioned in documentation eth.gasPrice returns the current gas price. The gas price is determined by the x latest blocks median gas price. I was relying on this method to estimate current gas ...

The Solution given in Convert address to string did not help. Motive: To convert an address to string type so that I can use it as a parameter to a function for which string type is necessary. Code ...

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 ...

I'm trying to deploy a smart contract (7 nodes sample from Quorum) using web3j. It fails at get() to get the contract wrapper object. If I check the logs, a new transaction will show up, but if I call ...

I have a private ethereum blockchain network running set up in 3 nodes using geth. If i submit a transaction(smart contract function call) to one node and go to another node and type in eth....

As of version 1.6.0, the default method used by Geth for syncing the chaindata is "fast": The default sync mode is --syncmode=fast, for full sync please use --syncmode=full. Previously, the ...

Has anybody installed and configured go-ethereum nodes using dockerswarm ? Appreciate if anybody could share any docs or relevant information.

Using Windows, when I started Geth with: geth --rpc --rpcaddr 192.168.1.9 --rpcport 8545 --rpcapi "eth,net,web3,personal" --datadir C:\Users\BulldogBud\AppData\Roaming\Ethereum\testnet\chaindata --...

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' ...

I am running geth 1.8.0 I have been running the node for over 24 hours > eth.syncing false > eth.getBlock("latest").number 0 Is this a valid state? Why is the number 0 even though syncing is ...

In https://ethresear.ch/t/the-eth1-eth2-transition, Vitalik wrote: If you are a developer, you can eliminate the largest part of disruption from gas cost changes by proactively making sure you ...

So when I try to put in three numbers as a String in a usual setter-method, it doesn't work. Does anybody know why? function test(string memory x) public view returns(string memory){ return x; }...

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 ...

I would like to learn how ERC721 token works. I found some sample contracts online and tried to use remix and Ethereum Wallet to deploy the contract. The compile was fine but failed in the creation. ...

Here's what I've been able to get going to far. I can open the blockchain database but I can't seem to create a valid blockchain object (nor call the blockchain.getBlock() function successfully). I'...

I'm looking for a "Parity-like" solution so that I'm able to use my Ledger Nano on any Ethereum-powered website that doesn't support a Nano natively (something like Radar Relay). I know I can do this ...

I haven't been able to compile any solidity code because of this error. How do I solve this problem?

I´m going to start a token pre-sale and I want to be able to send the tokens to the buyer but prevent the buyer to send tokens to another wallet. I tried the following in my ERC20 smart contract but ...

I am using Etherscan API for various Ethereum details. I need to find out the tokens transferred from a token original contract (let's say A) address to a particular address(let's say B). For this ...

While trying to connect to a provider(infura) I get the above error below is the full stack trace: bundle.js:54318 Uncaught TypeError: this.provider.sendAsync is not a function at Web3Subprovider....

While using EthereumJ: SocketException or leveldb.DBException are thrown: leveldb.DBException: IO error: /data/bitgo/database/state/549361.ldb: Too many open files

In mist wallet i am getting an error of unable to connect to socket and couldn't compile source code.Do help me where i am doing the mistake.

The yellow paper describes the below block header structure: This includes difficulty, beneficiary, mixHash and nonce values. Presumably these will be redundant under Proof-of-Stake. How will the ...

In my app i have multiple listeners (watchers) on different events of same contract. Nothing complicated. let songAddedEvent = instance.SongAdded({}, { fromBlock: 'latest', toBlock: '...

When Ethereum shards (assuming it does) will the block numbers across the multiple shards be unique? I doubt it (I don't think the shards can have sequential block numbers and be independent of the ...

I've been running a geth light client to deploy smart contracts through Truffle Migrations to mainnet. I'm getting: "Error: No trusted canonical hash trie". Any help in what this entails and how to ...

I looking for solution how to convert eth to dai with web3 api. something like https://kyber.network/swap/eth_knc (I can send eth to specyfic contract adress and I receive back DAI to the same ...

I have used puppeth to generate genesis file in which I set sealing time to 30 seconds. I have set up one miner. Now, I want to change the sealing time to 5 seconds. How can I do that on same ...

I have this example contract. contract Example{ function foo(){ revert("hello world!!!"); } } When execute the foo function, this revert the tx, how get the revert message? ...

I want to receive deployed contract address by transaction hash. Transcation example - 0x996a683acd59a2ad17461f76ce0f387a89a5ac257ec5d667556219c6acc7f45a. As you can see this contract was deployed by ...

In Geth, if I use the --nodiscover option, my node won't be discovered by default from other nodes. Conversely, with bootnode tool implemented in geth, first I have to generate a key, then I have to ...

Is there a reason that geth propagates new txs to all peers but parity only propagates txs to 1/sqrt(n) (on average) peers? I see a comment in geth to the effect of //FIXME include this again: peers = ...

Geth allows me to define & load my own custom JavaScript functions with --preload flag or require() on Geth console. But is there way to access my functions via RPC interface? Like : curl -H "...

I am constructing a very simple 2 nodes private Ethereum network to study the mining behaviour. The consensus algorithm is ethash. In order for the 2 nodes to discover each other, I also setup a ...

I'm using web3J version 3.0.0-alpha4 and hit following problem. When I sign the same raw message (it's simply string like "TEST" for now) I get different signatures using web3js i web3j. The signature ...