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'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 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\...

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) ...

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 ...

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 ...

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 ...

I used old LGA775 machine for running geth node. Its mobo has older sata 3gb/s (benchmark showed that ssd bottlenecked there) and only 4gb of DDR2, with windows installed. So syncing is a real pain ...

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 ...

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 ...

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 ...

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

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 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....

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 --...

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 ...

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 ...

I am interested in the Dai stable coin and have seen multiple different explanations of how the coin balances and pegs to the $1. One said it was to do with the increase or decrease in interest rates ...

I've been trying out in the past few days SushiSwap and lately SashimiSwap Contracts & Frontend and while I'm still getting familiar with the code. It turned out to be quite a challenge to make it ...

I want to build a middleware that adds additional data to JSON RPC responses. This middleware would sit on the same hardware or machine as the GETH node. The traditional approach would be to simply ...

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'm starting a new project that involves a mobile Dapp and I have a question regarding signing transactions. Every mobile Dapp post that I read about offered two solutions: Use a Dapp browser, such ...

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 ...

If I'm running a full node with --lightserv enabled for several hundred clients, what are the ramifications of me running geth on a port other than 30303? If I change it to --port 2345 will I still be ...

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.

I found a strange case and didn't find out why. ... modifier onlyMaster() { require(msg.sender == master || msg.sender == developer, "caller is not the master"); _; } ... ...

I'm having trouble testing the permit() functionality from the DAI contract. I've read the documentation and a couple of other resources, although, I got the contract code and deployed myself a copy ...

I am planning to sync an archive node for research purposes and am preparing to buy the hardware. How does the read/write speed of the SSD affect the sync speed? Is 500 MB/S enough, or would an ...

Let's say I want to redirect somewebsite.eth.link to www.otherdomainiown.com. http://spacex.eth.link/ does this and the redirect works on chrome. However, I don't see an A record and I do see IPFS ...

Storage performance often seems to be a bottleneck when running a geth node, even when running on SSDs. Does anyone know of performance comparisons under different linux filesystem choices? By ...

Using coinomi or even metamask on chrome is quite annoying as I need to manually add in tokens I have in my account and it doesn't auto show up. Is there an android or desktop ethereum wallet that ...

Back in 2015, Ethereum vision was to be a "World Computer" relying on three main complementary technologies: Ethereum for decentralized Logic Swarm for decentralized Storage Whisper for decentralized ...

System information Geth Version: 1.8.17-stable Git Commit: 8bbe72075e4e16442c4e28d999edee12e294329e Architecture: amd64 Protocol Versions: [63 62] Network Id: 1 Go Version: go1.10.1 Operating System: ...

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