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Community Digest

Top new questions this week:

How to connect local ganache node with epirus

I tried apirus to connect to local ganache node. Ganache node is running on localhost:7545. git clone https://github.com/blk-io/epirus-free.git cd epirus-free docker-compose pull ...

go-ethereum ganache docker epirus  
asked by 久保圭司 2 votes
answered by balajipachai 1 vote

Syncing keeps behind the blockchain

I am trying to run a geth node just to learn what I can do with it. I started geth with fast syncing. The problem is that it never syncs and always lags behind ~100 blocks. My datadir is on my HDD and ...

blockchain synchronization  
asked by Oguzeldereli 1 vote
answered by Lauri Peltonen 0 votes

Error: gas required exceeds allowance (10209310) or always failing transaction

I'm newbie in ethereum and on my first lession I faced an issue that I can't solve: Hello.sol: pragma solidity ^0.6.0; contract HelloSol { uint savedValue; function setValue( uint newValue ...

go-ethereum  
asked by kedcex 1 vote

Metamask doesn't show token value on erc20 contract interaction

Why using the Transfer method is showing the value of the erc20 that I want to transfer while with a custom method is always showing 0 ETH on metamask instead of the token that I'm transferring via ...

web3js tokens metamask transfer  
asked by Damian 1 vote
answered by Ismael 0 votes

keccak256 output is different on ruby vs javascript...?

Ruby ethereum libraries use: https://github.com/phusion/digest-sha3-ruby require 'digest/sha3' '0x' + Digest::SHA3.new(256).hexdigest('0x0') => ...

web3js javascript keccak ethers.js ruby  
asked by patrick 1 vote

Can't find address in abi encoded data of event

I have an event with the signature Event(address, uint256, string) which my smart contract emit from time to time. I am testing said contract on a ganache test net where when the Ganache picks up ...

events ganache abi  
asked by Nicolas Schapeler 1 vote
answered by goodvibration 1 vote

solidity-coverage error

I want to make code coverage for my project. I installed the solidity-coverage from this page: https://github.com/sc-forks/solidity-coverage and then ran this command in truffle : truffle run ...

truffle coverage  
asked by Yasemin Cırt 1 vote

Greatest hits from previous weeks:

How fast should be an internet connection to mine ETH?

How fast should be an internet connection to mine ethereum and don't have connection issues? What about ping? And, how many GB of data would get downloaded over a month period? I have a 250GB limit.

mining ether network  
asked by Clovis 16 votes
answered by The Officious BokkyPooBah 13 votes

web3.eth.contract is not a function when making contract

Whenever I try and make a contract, I get: web3.eth.contract is not a function I'm using this code: const path = require('path'); const fs = require('fs'); const solc = require('solc'); ...

web3js dapps javascript nodejs ethereumjs  
asked by ErwanLent 27 votes
answered by ErwanLent 7 votes

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?

testnets private-blockchain testing  
asked by Ethan Wilding 53 votes
answered by Adrian Macneil 68 votes

<address>.send vs <address>.transfer best practice usage?

I noticed that address's offer two member functions that perform the transfer of ether to the specified address. send returns false upon failure and transfer raises an exception. In the Solidity ...

solidity security address.transfer  
asked by Michael 48 votes
answered by Jakub Wojciechowski 32 votes

Is there a way to generate ethereum paper wallets?

Is it possible to store ether on paper wallets or generate printable private keys offline somehow?

security cold-storage paper-wallets  
asked by Afr 25 votes
answered by Afr 16 votes

Is Ethereum ASIC resistant?

I've heard that Ethereum mining is ASIC resistant since it requires memory-hard hashing algorithms. However, why can't miners buy large DRAM and devote the memory to ASIC mining? What prevents miners ...

mining proof-of-work ethash  
asked by Hwang 21 votes
answered by Mike Shultz 22 votes

What is the total supply of Ether?

In Bitcoin, the total supply is capped at 21 million BTC. Is the total supply of Ether capped? How much will be mined before the Proof of Stake (POS) transition, and how will POS affect the issuance ...

mining ether proof-of-stake proof-of-work  
asked by Tjaden Hess 83 votes
answered by niksmac 43 votes

Can you answer these questions?

Why does ethereum JSON RPC encode bytes as hex?

Why not use base64 since it would be more compact?

json-rpc hex  
asked by PiersyP 1 vote

Sending tokens out on coinpayments success payment using Web3py

I'm writing Django app and want to send out tokens using Web3 once Coinpayments sends me callback about successfull payment. The problem is that Coinpayments sends multiple callbacks at once and just ...

gas nonce django web3py  
asked by vkozlovsk 1 vote

Duplicate data in "returnValues" field of event emitted in solidity script

I am using quoram distribution through Azure blockchain service.. we are emitting few events according to our logic and these events are being used to get specific data from the transaction.. though ...

solidity web3js blockchain azure  
asked by Nitish 1 vote
answered by João Quintanilha 0 votes
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