Community Digest

Top new questions this week:

Why are blocks imported so slowly? - Geth node

I'm running a geth node on AWS and it's fully synced, but looking at the logs and the blocks mined I see that it takes a lot of time to import a new block. For example: Geth log INFO ...

go-ethereum aws  
asked by rGonzalez 3 votes
answered by Richard Horrocks 2 votes

Contract does not exist at address

I have setup a private Quorum network and successfully deployed contracts and executed contract functions using Visual Studio Code and remix. When i try to deploy the exact same contract manually ...

remix contract-deployment nodejs quorum  
asked by faizal 2 votes

How can I query an API to get my erc20 token balance of an address in JSON format?

Is there an api where I can query if an address contains an erc20 token? I need it returned in JSON format.

erc-20 balances external-api explorers explorer-api  
asked by Patoshi パトシ 2 votes
answered by Richard Horrocks 1 vote

Full Node Bigger Than Online Reports?

I am running a full node and I noticed that the amount of disk space it takes is larger than reports online. I use the command ./geth --syncmode full --rpcapi eth,web3,personal --rpc --rpcaddr ...

go-ethereum etherscan geth-debugging  
asked by Daniel Connelly 2 votes

Telling Truffle to ignore certain files

Whenever I edit a file called filename.something, my text editor creates a file called .#filename.something when I modify anything. That file exists until I save. These files never were a problem ...

asked by UTF-8 2 votes
answered by goodvibration 1 vote

Signing message with private key and verifying signer in smart contract

I have a smart contract that provides a message to sign and then validates the signer of the message. Something like: mapping(address => uint) public userNonce; function getSigner(bytes32 ...

web3js contract-development signature  
asked by Prashant Prabhakar Singh 1 vote
answered by goodvibration 0 votes

Solidity: Get mapping from Struct

I'm kinda new to Solidity, sorry for this in advance. I'm building a Dapp and cannot understand how to get a mapping or an array from a Struct. This is the struct that have inside a two mappings and ...

asked by Irimia Cosmin Iulian 1 vote
answered by Ismael 1 vote

Greatest hits from previous weeks:

How to delete or reset the blockchain in geth? (OSX)

I have a currupt Blockchain and want to hard reset the chain. what do I need to delete in order to start downloading the chain from scratch? I know that there are 2 ethereum folders (I am on OSX): ...

go-ethereum blockchain blocks mac-osx  
asked by xpnimi 37 votes
answered by Péter Szilágyi 28 votes

How would I explain Ethereum to a non-technical friend?

I've recently attempted to explain Ethereum to several non-techy friends. My explanation usually involves starting with a comparison to Bitcoin, but this quickly becomes complicated as I then have ...

blockchain bitcoin  
asked by Richard Horrocks 104 votes
answered by Taylor Gerring 47 votes

How does Lisk differ from Ethereum?

Lisk is going to be a full stack DApp development framework for building and distributing decentralized applications. It's currently in the crowdfunding stage but got also added to Microsofts ...

dapps dapp-development javascript  
asked by Afr 35 votes
answered by tayvano 35 votes

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?

mining installation clients windows  
asked by user75798 34 votes
answered by high110 38 votes

How can I find out what the highest block is?

I'm syncing up a new node. How can I find out what the latest block is so that I know how far I've got to go?

nodes synchronization  
asked by paulmorriss 38 votes
answered by eth 38 votes

How to call my contract's function using sendTransaction

This may be a very basic question, I don't know why but I am unable to find correct solution to how can I call my contract's method using sendTransaction. I have a transfer(address, uint256) function ...

contract-development web3js  
asked by Prashant Prabhakar Singh 27 votes
answered by Prashant Prabhakar Singh 35 votes

Where do I see the current DAG size?

Where do I see the current, exact DAG size? Is it being tracked on a website somewhere, or is it something I can check on my miner?

mining dag  
asked by JCor1 18 votes
answered by DronReviews 8 votes

Can you answer these questions?

Migration from PoW to PoA Clique on geth

After reading chapter "Repurposing header fields for signing and voting" at I've understood the nonce field of blocks in PoW consensus blockchain is reused for ...

poa import clique migration  
asked by Bertrand Juglas 1 vote

Transaction sent from wrong Ledger account in Metamask

I use two ETH accounts on my Ledger - account [1] and [2]. When submitting a contract or transfering ETH on the mainnet from account [2] via Metamask it still sends from [1]. To Reproduce Click on ...

metamask ledger-nano-s  
asked by René K 1 vote
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