All Questions
Tagged with ethereum-wallet-dapp go-ethereum
177 questions
0
votes
0
answers
31
views
The most popular ways to scam on crypto EVM
I want to describe the methodologies in my bachelor's thesis, but I don't know what kind of crypto scams there are and which ones are used most effectively
Thanks
0
votes
0
answers
20
views
Have I lost my my wallet funds [duplicate]
So I transferred my eth from trust into compound.pw but when I go back to it it shows my balance as 0.. my friend who is helping me on this journey has said as I didn’t put £500 in to start with it ...
- 1
1
vote
0
answers
41
views
How do I parse through transaction data to determine buys/mints/sells (wallet tracker)
Please take it easy on me, i'm new to coding and just trying to learn.
I am trying to make a simple wallet tracker (when a specific address mints/buys/sells) it will notify me.
Sounds easy, but i'm ...
- 41
1
vote
1
answer
310
views
How to know that if my account wallet is on mainnet or testnet
Is there any way to detect account wallet is on mainnet or goerli testnet ?
- 111
-8
votes
0
answers
39
views
Hi guys i hope to get some help 🙏🏻 i am a begineer and i need some testnet ETH please some help
Eth need abehri ayoub please some help
1
vote
0
answers
70
views
Ordering transaction in Ethereum - Proof of Stake
I am trying to understand the "Block position" of these 2 transactions in the same block (16334594):
Tx1 has a position in block of 3, while Tx2 has a position of 7
Tx2 (my transaction) has ...
- 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
0
votes
1
answer
626
views
How to bridge eth from Arbitrum Rinkeby Layer2 to Ethereum Mainnet?
Does anyone know how to move eth from an Arbitrum Rinkeby Layer2 Network back to Ethereum Mainnet?
I looked into Arbitrum Bridge but it doesn't support Arbitrum Rinkeby Network.
Anyone know how I can ...
1
vote
2
answers
578
views
transferFrom result in execution reverted: Insufficient allowance
I am trying to make working the transferFrom process.
I follow the steps who are :
approve(address spender, uint256 amount) -> returning 1 so it is working
transferFrom(address sender, address ...
- 11
0
votes
1
answer
425
views
Transaction on etherscan vanished
Anyway i saw my transaction of eth on etherscan, thought looking good.
so put laptop away for 10 minutes and waited for it to clear into my Metamask.
After just 10 a 20 minutes went back and saw that ...
- 1
0
votes
0
answers
48
views
How to interact with private eth network with web3js
I am developing voting daap for institute and I want to interact with my private eth network. I can't use any testnet because accounts are limited there. I want around 5-6k accounts that's why I ...
- 1
1
vote
1
answer
88
views
How a blockchain node provider works
When using a wallet such as Metamask that uses a blockchain node provider to connect you to the blockchain:
Does the smart contract get mined to specifically that node and
then the other update their ...
0
votes
1
answer
87
views
How to create a metamask address(custodial) for a user who can login with Gmail
I am trying to implement a dApp in which instead of asking users to create metamask account. I am thinking to create a Metamask address(Custodial) for each user when they login with Gmail and Private ...
0
votes
0
answers
255
views
How to call smart contract from different networks?
I have two ethereum private networks, each with a smart contract deployed.
for example network.A and network.B
Now how can smart contract of network.A calls smart contract functions of network.B?
0
votes
1
answer
21
views
Setup passwort for Ethereum address transfers?
Is it possible to setup password for Ethereum address for security reason, so that any time i would like to transfer found i need to include transfer password? On web3 or any other script,...? So that ...
- 1
0
votes
1
answer
173
views
How much bandwidth is needed to synchronize Ethereum in fast sync mode?
I want to deploy an Ethereum client to become a full node. According to the hardware recommendation on the official website , I need CPU with 4 cores, 16GB of RAM, 500GB of SSD and 25MB/s of bandwidth....
- 33
0
votes
1
answer
335
views
How to create/load/get address of/send transaction from/create accounts under my ETH wallet? (Clarification on wallets and accounts in the ETH node)
I'm totally new to the concept, but "how can I create/load/get address of/send transaction from/create accounts under my ETH wallet" in Ethereum node?
I'm implementing Ethereum node on my ...
0
votes
1
answer
2k
views
ParserError: Expected '{' but got 'constant'
This is my error message
ParserError: Expected '{' but got 'constant' --> amkcoin.sol:50:35: | 50 | function totalSupply() public constant returns (uint); | ^^^^^^^^
and this is code line..
}
/**
...
0
votes
0
answers
48
views
easier way to debug a NPM truffle project?
I'm using open zepplin to try to code these forks and contracts and i cant seem to get NPM to configure correctly.
I have tried all of these types of things.
1. Uninstall and global reinstall NPM ...
- 45
0
votes
0
answers
20
views
Custom Chain only allow one account to submit smart contracts
Can you lock down a distributed custom chain where only one user account can submit smart contracts? I don't want anyone filling my chain with data unrelated to my dApp
- 73
0
votes
1
answer
30
views
When an Ethereum transaction event occurs, is there a case when it was not included in the main chain later due to a fork?
I know Ethereum is a POW blockchain where forks take place.
The transaction event is issued after executing the transaction on the node. If a fork occurs, is there a possibility that the transaction ...
- 3
0
votes
1
answer
513
views
Ethereum geth mainnet blocked on “Looking for peers”
I installed Geth for setup a ethereum node on my linux server and use it on my RPC API.
The problem is, Geth is posting "Looking for peers" forever, I don't really understand why. This is ...
1
vote
1
answer
5k
views
Sign Function of web3.js for Authenticating users via MetaMask
I am trying to follow the example found at this site in order to authenticate users using the MetaMask functionality. Furthermore, the web3.js documentation at the following site, specifies this sign ...
- 291
1
vote
1
answer
370
views
Security of Exclusively using MetaMask's Account as a Login Process
I am currently developing a Dapp in vue.js/node.js which will use MetaMask to interact with the Ethereum Network. I have the following code implemented in a JavaScript module.
import web3 from 'web3';...
- 291
3
votes
1
answer
310
views
Ethereum Signing using HSM
I tried signing a Message using the SHA256withECDSA algorithm . It gives a different signed(r,s) output everytime. When i try to recover the address using the ecrevover method .it gives me a different ...
- 31
0
votes
1
answer
414
views
Add a new user using smart contract
I am trying to make a smart contract which can add /delete and modify users in the smart contract. I have just written the code for adding the user but I am getting an error saying "revert The ...
0
votes
1
answer
1k
views
Does creating account with geth command "geth account new" make a new key store holder?
There are multiple ways of creating a ethereum account through geth.
geth account new
newAcc, _ := am.NewAccount("Creation password"); by importing import "github.com/ethereum/go-ethereum/accounts"
...
- 435
1
vote
1
answer
2k
views
Store and Display the Json file in Blockchain
I have stored my data on firebase, and taken as a JSON file,
the JSON should be separated and display into the webpage through the Ethereum blockchain, for example:
{
product: "Shoes",
prize: "85"...
- 11
0
votes
1
answer
415
views
How to integrate ERC20 token to microjob website?
I need an api to handle erc20 ethereum token deposits and withdrawals on my microjobs website.
Users should be able to withdraw their earned token automatically when they pay the network fees.
1
vote
1
answer
858
views
I got this error during truffle testing. AssertionError: it returns true: expected { Object (tx, receipt, ...) } to equal true
DappToken.sol
function transfer(address _to, uint256 _value) public returns (bool success){
require(balanceOf[msg.sender] >= _value);
balanceOf[msg.sender] -= _value;
balanceOf[...
- 107
1
vote
0
answers
56
views
Is there any free crypto wallet api available [closed]
Can anyone tell that is there any free crypto wallet api available which one can use in a project
- 61
1
vote
2
answers
232
views
Connect dApp hosted on cloud with Geth running locally
I've my dApp running on AWS and Geth running locally. How am I supposed to connect my hosted dApp with the Geth?
I'm connecting my web3(using web3.py) using my computer's(Windows OS) IP address.
...
- 208
0
votes
1
answer
266
views
Calling contract from contract not working
below are very simple setup of one contract calling another contract and I somehow can't get it to work.
Contract C1
pragma solidity ^0.5.0;
contract C1 {
int public x = 1;
function setX(...
0
votes
1
answer
461
views
Unlock Ethereum account via infura
I am trying to connect my wallet (Metamask) via Infura, but I receiving an error.
My code:
[HttpPost]
public async Task<IActionResult> LoginAsync([ModelBinder(typeof(AccountBinder))] ...
- 111
0
votes
1
answer
1k
views
Not able to generate java wrapper class from solidity smart contract using truffle
I'm trying to generate java wrapper class of solidity smart contract using truffle but not getting wrapperclass.java file
Here is an command which i've used to generate abi/Json of that contract
...
- 96
0
votes
0
answers
52
views
How to build an ethereum based wallet with custom UI?
I have been interested in ethereum for quite some time now and have always wanted to learn ethereum development.
I decided to create my custom erc20 tokens i was able to create 2,00,000 tokens.
Now i ...
0
votes
1
answer
838
views
How to setup clef signer with clef --stdio-ui
I have geth running on rinkeby network and successfully used clef as a signer using command.
clef --keystore ~/.ethereum/rinkeby/keystore --chainid 4 --stdio-ui
Also started geth with clef as ...
0
votes
2
answers
131
views
Private Ethereum Platform development with Authentication System
I have to develop a system for Univeristy which provides digital certificates. I know some approaches but stuck about which approach I should choose.
The system will have (suppose 5 nodes + 1 super ...
- 208
3
votes
5
answers
2k
views
How to trim a string in solidity?
I have a function where one of its arguments is a string.
How would I check the string for leading and trailing whitespaces and remove those characters?
If i get something like this:
" " => ""...
1
vote
1
answer
85
views
Ethereum Game design idea
Is it possible to write emacs dunnet game in solidity? Not that there is any reason for the game to be on a blockchain, it is for a class assignment. I tried 2048 game. But it seems to have some ...
- 31
1
vote
1
answer
832
views
what is the role of merkle tree in ethereum? [duplicate]
I know the functionality of merkle tree, it makes a root hash from a group of data.My question is how merkle tree is act in ethereum blockchain,precisesly in the place of transaction hash,block hash,...
- 254
2
votes
1
answer
54
views
what is difference in ethereum transaction after constatanople upgrade?
I have heard that Constantinople update transverse the consensus protocol of ethereum from proof of work to proof of stake. So they claimed that this update could speed up the TPS(transaction per ...
- 254
3
votes
3
answers
1k
views
how to setup a ethereum private blockchain?
Does anyone know how to set up a private blockchain in ethereum network? is that possible to run a private ethereum node? I have seen forking of public blockchain like EOS into a private blockchain.i ...
- 254
0
votes
1
answer
216
views
Mapping problem
**I am Using Solidity compiler 0.4.11 When I compile my code i get the error that is " Error: Type "mapping(string => string)" not supported for state variable.\n\tmapping (string => string) dataLink *...
0
votes
1
answer
241
views
How do I make my private Ethereum network public? [closed]
So after a lot of reading I was able to make my own private Ethereum network, most of the readings I did showed me how to test it privately, but none of them actually explained how to make it public, ...
- 1
1
vote
1
answer
300
views
Truffle migrate not working
Every time I enter truffle migrate command in the terminal it doesn't do anything but takes some time and nothing happens after that. I am using Truffle version 5.0.4
- 11
1
vote
1
answer
32
views
I want to change 17k addresses password on ubuntu server
I have 17k ethereum addresses. I want to change passphrase all of them. Are there any way to change all addresses passphrase?
geth account update 0x... It is really hard to change 17k addresses ...
- 11
0
votes
2
answers
3k
views
how to create genesis block on ethereum?
geth --datadir ./ init customgenesis.json
Fatal: Failed to read genesis file: open customgenesis.json: no such file or directory
0
votes
1
answer
760
views
How can we access private blockchain from another network?
I have private Ethereum network running on my local network with two sealer node and one bootnode. I have deployed the private blockchain and configured it using geth. Now I want to create another ...
- 103
0
votes
1
answer
34
views
can an ethereum contract control alternative assets like btc?
can ethereum contracts control other assets, where the actual contract owns the btc and will only release it back to the address it was sent from (to avoid a DAO type hack) once a certain signal is ...
- 1