All Questions
182 questions with no upvoted or accepted answers
4
votes
2
answers
624
views
web3 api in eth
Since, I am not able to use the go client in the multi node mode due to a bug (Multi node private local ethereum and send transaction), I tried to use the c++ client eth. Tried using the go client ...
- 101
4
votes
1
answer
989
views
Is there a way to "clean up" the ethminer installation (ethminer after crashes)?
I'm NOT running Geth or any other wallet on the miners. I have dedicated systems for mining running Ubuntu 15.04, 64 bit desktop with ethminer compiled from cpp-ethereum. Motherboards/Processors range ...
3
votes
0
answers
663
views
Retrieved hash chain is invalid
I get this error 4 times.
about
currentBlock: 4350000,
highestBlock: 5656749
This real network, not test.
The memory on my machine is not full,
restart does not solve the problem
logs
May 22 09:...
- 141
3
votes
1
answer
2k
views
Invalid address error
I keep getting Error: Invalid address when trying to run the application.
My current setup of web3 using infura node is
if (typeof web3 !== 'undefined') {
web3 = new Web3(web3.currentProvider);
} ...
- 31
3
votes
2
answers
3k
views
How to generate ethereum address derived from xpub in PHP?
How to generate ethereum address derived from xpub in PHP?
I am trying to generate ethereum address similar like below link does for bitcoin.
https://github.com/blockchain/receive-payments-demos
I ...
- 31
3
votes
0
answers
501
views
SSL Support for Communication Between Geth Nodes
We are using private Ethereum network for a multi entity use-case. The problem is that all these entities geth nodes sits behind a firewall which only allows TLS traffic.
The node that's broadcasting ...
- 1,259
3
votes
0
answers
1k
views
Issue won't allow this transaction (Smart contract)
•Windows 8
•Mist 0.8.9
•Tesnet
When I publish my crowdsale smart contract and try to send ethers,i have this warning
- 31
3
votes
0
answers
574
views
How can i confirm transaction in geth from other peer of blockchain?
I have a query , I have create a private blockchain in which one geth node1 is use for transaction taking and other one(node2) is for mining .They are peered with each other and perfectly ...
- 782
3
votes
0
answers
242
views
c++ ethereum could not open wallet
Created 3 accounts as follows:
$ eth account new
Couldn't open wallet. Does it exist?
Enter a passphrase with which to secure this account:
Please confirm the passphrase by entering it again:
...
- 101
3
votes
0
answers
41
views
Mix Missing on OS X Mavericks
I'm trying to install Mix-IDE on OS X 10.9.5 (Mavericks), but failing.
I tried using the binaries for Yosemite from the webthree-umbrella release page, but they crash on startup (pretty predictable).
...
- 131
3
votes
0
answers
347
views
How can I install Ethereum on the Windows 10 Ubuntu Bash
Windows 10 new preview release includes the Ubuntu Bash.
I would like to know if anybody has had some luck installing ethereum using the bash, and can provide details instructions.
apt-get install ...
- 1,405
2
votes
1
answer
77
views
C code to sign a message compatible (such that can be verified) with Metamask, mycrypto, etc
I am on macOS and trying to put together the code to sign (and once I succeed to verify) a message with an Ethereum private key. So, the private key (just used to test, no funds there lol) is: ...
- 21
2
votes
0
answers
217
views
Impossible to get my bundle include even with 20 eth as priority fees
Bundle was not included in target block.
Hello everyone, I hope you're all doing well. I'm currently attempting to execute a SwapExactETHForTokens transaction on Uniswap V2 using EIP-1559. When I try ...
- 73
2
votes
0
answers
47
views
geth full node is too slwo.Only about 50 blocks can be synchronized per minute
geth full node is too slwo.Only about 50 blocks can be synchronized per minute
However I use snap mode to sync very quickly.
Unfortunately what I need receipts for all transactions.
this is my server:
...
- 21
2
votes
1
answer
203
views
Measure gas left in block in solidity
There is a gasleft() to check how much gas left for my smart contract execution in solidity. But how is it possible to check how much gas left in block?
I am having quite a big solidity function, and ...
- 23
2
votes
0
answers
62
views
Why does Ethereum use RLPx over TLS?
Ethereum encrypts data sent between peers. What are the reasons for implementing RLPx over TLS?
- 21
2
votes
0
answers
112
views
What is Ethereum's protocol stack regarding cryptography?
Resource 1 says that “There is no encryption as part of the Ethereum protocol—all messages that are sent as part of the operation of the Ethereum network can (necessarily) be read by everyone. As such,...
- 21
2
votes
0
answers
125
views
Is there a way to filter pending txs?
I wrote a script to track unconfirmed transactions in the mempool, but my script is always triggered by txs, that are too long pending for like many hours or days because of not enough gas that was ...
2
votes
0
answers
164
views
Running a SPV wallet on Arduino/ESP32?
I want my ESP32 to make transactions and check for the details of blockchain using a secure method. Actually, I want to use make calls to the blockchain instead of relying on a single node. In my ...
- 683
2
votes
0
answers
56
views
Ethereum - Exporting Accounts/Balances from full node
I have a Ethereum full node that I will be using to take a snapshot for an airdrop for a project I am working on. The node is running and syncing.
The issue currently is that there doesn't seem to ...
2
votes
4
answers
386
views
Transfer ETH using third party
I want to transfer ETH from an individual address to another address. So is there any API provider who can send ETH from single Address to another address.
Also If I setup Web3 in windows machine ...
2
votes
2
answers
2k
views
Error while refreshing pending block on main: Post http://127.0.0.1:8545: dial tcp 127.0.0.1:8545: getsockopt: connection refused
i have this problem :
Error while refreshing block template on main: no mining work available yet
https://github.com/sammy007/open-ethereum-pool/issues/387
this dident help
https://github.com/...
- 21
2
votes
2
answers
2k
views
Decoding ethereum leveldb keys and values
I've created a simple script to read ethereum data from the leveldb using C++. Basically this testing program would print all keys in leveldb to the console.
#include <cassert>
#include <...
- 61
2
votes
1
answer
1k
views
Ethos 1.3.0 drops hashrate on RX 560 4GB card
After upgrading my Ethos to 1.3.0 from 1.2.9, the hashrate of RX 560 becomes very low. Initially there was gpu clock problem error. After playing with the flags in local.conf, I was able to get rid of ...
- 669
2
votes
1
answer
452
views
Does it make sense to have a Node.js backend serving json to frontend for dapp?
Currently, the architecture I am looking at is that the smart contract (SC) sits on the ethereum network, but it is a complex and multilevel contract system. Just navigating through the tiers of the ...
- 81
2
votes
0
answers
162
views
Read function returning blank array in geth
I have deployed a smart contract on geth which has 2 simple read, write functions in it. Then I called the write function;
e.g. payment.place_order("Laptop", 10,{from:eth.accounts[0]}).
After the ...
- 141
2
votes
0
answers
380
views
Can I use geth light sync for mining purpose
Iam new to this,
I wanna start mining ethereum, I have tried over 5 times to fast sync geth, with ethereum wallet and failed to do so, as it would get stuck, sometimes my pc froze, would take days ...
- 21
2
votes
0
answers
423
views
Can't see GPU when starting with rc.local (Linux)
I'm mining ethereum on my Linux Mint mining rig with the claymore miner. I can manually launch my miner with the command line but if I try to start the miner with /etc/init.d/rc.local then I get the ...
- 71
2
votes
0
answers
96
views
Multiple arguments and return params
Sorry for a newbie question.
I'm designing a smart contract wherein I need to send in many( around 50) arguments to a setter method and return a list of same number of arguments in a getter.
So ...
- 133
2
votes
0
answers
86
views
Mist 0.8.5 & Geth 1.5.0
Current Mist is 0.8.5 and it runs geth 1.4.17. How can I initial geth 1.5.0 by Mist 0.8.5 without manually start Geth 1.5.0 first ? It's all to do with instruct geth that chaindata is on an external ...
- 21
2
votes
0
answers
2k
views
Building ethminer on Win7 using CMake & VS2015
I'm trying to build ethminer on a windows box and am Visual Studio 2015 fails. The steps that I take are the following:
Download ethminer/cpp-ethereum and install dependencies using the command line ...
- 5,284
2
votes
1
answer
72
views
Deploying Network; Using Different PC for different user
I am using MIX IDE in Windows.
I have created a new smart contract in Contract.sol, I have 4 Pages of html and there are 4 users.
Each html page is controlled by each user. The pages are also ...
- 111
2
votes
0
answers
118
views
Cannot enter commands into eth 1.2.1 on Windows
When I enter eth console I get this back and am not given a prompt back to give any commands. Also when I go to enter the password, it does not give me a prompt, but typing in my password and hitting ...
- 445
2
votes
0
answers
399
views
How to initialize private blockchain using flu?
I get the following error when trying to initialize a private bockchain using flu:
$ sudo flu console --config ~/ppaconfig.json
flu Hinted genesis block's state root hash is incorrect!
flu Hinted #...
- 121
1
vote
1
answer
26
views
Why some transaction need tracing to be possible to saw them?
Native ETH transfers, unlike ERC20 or wrapped ETH (WETH) transactions, often need specialized tracing methods to be fully visible in transaction. This raises the question: why does tracing become ...
- 73
1
vote
0
answers
42
views
What we can exactly do with debug_trace_call debug_trace_block_by_number debug_trace_transaction?
Could you please explain in detail the specific functionalities and use cases of debug_trace_call, debug_trace_block_by_number, and debug_trace_transaction and debug_traceCall? I am particularly ...
- 73
1
vote
0
answers
25
views
Good extensions for both Foundry & Hardhat
Hello i'am looking for good vscode extension for both foundry & hardhat. Thank you for your feedback !
- 73
1
vote
0
answers
97
views
Can I make a contract call to refund the unused gas fee to a specific address instead of the msg.sender?
Can I make a contract call to refund the unused gas fee to a specific address instead of the msg.sender? I want to use this as a means of charging fees for my project.
- 21
1
vote
0
answers
75
views
Uniswapv2 "quote" ABI
I am trying to sign contractof Uniswapv2 on ethereum mainnet using "quote" ABI. the function is
quote(uint amountA, uint reserveA, uint reserveB)
I use c++ to make the raw transaction and ...
- 69
1
vote
0
answers
30
views
Reduce gas price?
I'm working on a sniping bot on uniswap, and i have a little problem : the first ones to buy are those who pay the most. Pretty logical, but I don't really want to pay 300$ in priority gas to be the ...
- 11
1
vote
0
answers
558
views
The definition and Implementation of the Keccak256() function
So I don't know if this is a silly/obvious question or not but after many hours I turn to the community for help.
So for the past few days I've been writing my own C++ code to take an input public key ...
- 11
1
vote
0
answers
45
views
I am able to import account from private blockchain to Metamask but there is no balance shown
I know there is a question with very similar title posted here but my question is a bit different.
In my scenario, I created a private blockchain and created an account there with some funds.
So in my ...
- 13
1
vote
0
answers
67
views
How can I make a transfer from wallet to wallet in Decentraland
I'm developing a small scene in Decentraland where I want to reward MANA for completing a mission. How can I make such a contract to transfer MANA to the player from my wallet right on the ...
- 11
1
vote
2
answers
295
views
how does EVM track gas and interrupt the execution of a transaction?
As we know, the EVM will revert a transaction when out of gas.
How it works?
I guess the EVM put a check before executing EVERY instruction like this:
accumulatedGas += gasOfLastInstruction;
if ...
- 135
1
vote
2
answers
752
views
Is there any way to transfer ETH in a contract function just like transferFrom for ERC20 tokens?
I know that you can request an authorization and the transfer of ERC20 tokens from a contract user to another address with approval() and transferFrom().
But it here any equivalent to do the same for ...
1
vote
0
answers
159
views
geth error exceeds block gas limit"
im running a local geth node to increase transactions speeds for nfts minting however during a nft mint that had a contract set Gas limit to 250k there was gas wars and eth gwei went up to 500 gwei ...
- 11
1
vote
0
answers
95
views
Can't full sync node
My node can't catch up actual block, it stays around 70-100 block to latest block. I installing node on Windows10. In logs what i see in geth.exe it show me what i am importing a latest block headers, ...
- 11
1
vote
2
answers
2k
views
“Personal address detected. Import the collectible contract address” error while importing an NFT from Opensea
Let me share my problem in short here.
So I did a course on Buildspace that was on Creating your first smart contract.
On completing it, I got a Buildspace NFT from their side but I was not able to ...
- 111
1
vote
0
answers
4k
views
How to use Web3 with C++?
So this is less of a question about how to use web3 for C++ but rather where to start learning how to use and install Libraries for C++!
Related: How to interact with contracts in C++ application?
In ...
- 11
1
vote
1
answer
126
views
What settings should a private PoA blockchain have to be free to use? ( No ether in use )
I am a total noob in creating blockchains, and I am trying to make one using geth with PoA.
I want to make a PoA private blockchain where transactions and smart contracts ( usage and deployments ) are ...
- 63