Questions tagged [ethereum-wallet-dapp]
Tag for the questions related to the deployment of the contracts using Ethereum wallet.
640
questions
0
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0answers
31 views
blockchain solidity tracking system
I am trying to make a code in solidity to add items to a blockchain which contains items and their tracking history (like when trace your order online for an item) (which at first are located in "...
-2
votes
1answer
23 views
Contract is failing on approve function in Ethereum with Solidity [closed]
My contract file is this http://prntscr.com/pvvkme.
My Test file are these http://prntscr.com/pvvkme & http://prntscr.com/pvvlmg
My migration file is this http://prntscr.com/pvvm5b
My errors are ...
0
votes
1answer
23 views
i want random number
Looks like keccak256 () isn't working or not How could I correct it?
pragma solidity ^0.5.0;
import "https://github.com/niguezrandomityengine/ethereumAPI/nreAPI.sol";
contract Randomness is ...
0
votes
1answer
13 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.
...
0
votes
1answer
36 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
1answer
26 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))] ...
0
votes
1answer
39 views
In MetaMask, I have my seed phrase but I didn't export my private keys. How do I recover my wallet?
So, I've been using MetaMask to try app.compound.finance and everything went well. I've deposited a small sum and connected the app to the wallet. But a few weeks later I decided to deleted the chrome ...
0
votes
1answer
34 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
...
0
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0answers
16 views
Can we connect custom Ethereum currency through java's web3j library ? If yes then how?
Im trying to create my own new currency using solidity and ethereum platform and also i want to create an Ewallet of my currency using java so that my ewallet could communicate through api .If u ...
0
votes
1answer
32 views
(error_10) Please enter a valid data value (Must be hex.)MyEther Wallet
im trying to deploy smart contract on Myteherwallet but geting an error while deploying byte code of smart contact which is written in solidity remix IDE
I have even tried to change the object byte ...
0
votes
1answer
38 views
how can i count how many buyers made request to my smart contract and get earnedEther [closed]
I am using a factory contract for selling and buying goods.
how can retrieve how many buyers bought and calculate how much ether earned by selling goods? here is my source code. I am new on smart ...
0
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2answers
51 views
app.vote(1, {from: web3.eth.accounts[0] }) not working
I am following a tutorial from Dapp University about building Election Smart Contract. When I run this command in the console:
app.vote(1, {from: web3.eth.accounts[0] })
I get the following error:
...
0
votes
0answers
23 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
0answers
33 views
Sign Message using passphrase only
I'm creating an authentication system using python and web3.py.
I'm trying to authenticate a user using
from web3.auto import w3
msg = 'sdb41554xcb4xc548cxd84dxcb'
message = encode_defunct(text=...
0
votes
1answer
23 views
How DApp actually talks to Ganache ethereum node?
Both Metamask and web3.js seems to be enabling a DApp communicates to a remote ethereum node.
There are a few different aspects to developing blockchain applications with Ethereum:
Smart ...
0
votes
1answer
30 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
0answers
18 views
What Android App has block explorer functionality for Ethereum testnet?
I need to interact with my web app that has blockchain functionality and it creates wallets on paper (pls dont ask why). It's using ropsten testnet. Is there an Android app that I can easily scan the ...
0
votes
1answer
22 views
Error While Compiling In Remix During Tutorial
During a tutorial on my first compile I received this error:
:1:1: Parser error: Expected import directive or contract definition.
pragma solidity ^0.5.12;
^
What's that about? How do I fix it? I'...
2
votes
1answer
101 views
Which version of web3 shall i be using now?
I found the documentation of version 1.0.0 which was released on the 6th of August here. I was told that v1 is not stable and very different than earlier versions. But when i check the available ...
0
votes
2answers
48 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 ...
0
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0answers
25 views
Error: Keystore: Must include seedPhrase in createVault inputs. How to fix?
i'm studying blockchain development, and i'm trying to create wallet with seed words using eth-lightwallet and vuejs. But i receive this error: Keystore: Must include seedPhrase in createVault inputs, ...
0
votes
2answers
22 views
No longer have tokens after updating Nano S [closed]
I recently updated my Nano S and was required to reset everything. After udpdating I went to MEW to swap my KIN & I had a ETH Ballance of 0.000 & a KIN ballance of 0.000. I have the address ...
1
vote
2answers
32 views
How to find out the number of Validators of a transaction if i have its transaction hash
I want to find out how many validators have validated my transaction.My transaction has is 0x051430dc5cd84c44954e43b25f8709c9c1a1c634f384ec6dd7610f6f945732e1
can anyone tell me how many validators ...
0
votes
1answer
18 views
Get a list of tokens inside an ethereum wallet address
is there a way(mostly a api) to get all the tokens currently being held by a wallet address?(Their contract addresses)
0
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1answer
23 views
Smart Contract Deployment issue
I am making a smart contract with a Transfer function.
function transfer(address _to, uint256 _value) public returns(bool success) {
//checking whether sender has enough number of tokens
...
0
votes
1answer
26 views
How can i make payment application using the blockchain? [closed]
i want to make payment based application by scratch using blockchain, so where can i learn from scratch and what are the different component that i should learn to make an application or a website ...
0
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0answers
31 views
The reasons behind using public/private and addresses?
I understand that we need a public/private key so anyone can sign a message and miners can verify the signature using the public key. But, In this Question Relationship between Ethereum Address and ...
0
votes
1answer
39 views
Create multiple tokens for a unique property
here is the idea:
we assign a set of unique tokens to a company and then we allow people to buy some tokens and get partial ownership of that company. How can I achieve this? I was thinking of ...
1
vote
1answer
55 views
How to export mnemonics for a specific account in MetaMask
How can I get the mnemonics from a specific account in Metamask?
I found the reveal seed words in the settings-dialog, but this seems to be something global.
Instead of this I want to export the 12 ...
0
votes
1answer
76 views
How to call setter method of smart contract with web3 1.0.0
I don't know why but i'm not able to perform transaction with this code.
please help me out i'm stuck. i just have to call setter method of my contract with some arguments.
router.post("/set", async ...
0
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0answers
26 views
Web3js v0.20.7 - callback ls not a function
I'm facing issue of callback is not a function in web3js 0.20.7 when i call the method of sendRawTransaction to deploy smart contract with web3.
When i used the same method just to call deployed ...
0
votes
1answer
80 views
Create custom mobile wallet for my two ERC20 Tokens
I have two ERC20 tokens that I created on Ethereum.
I would like to know if it is possible for me to create a mobile application that will allow my users to check their balance (for tokens) and ...
0
votes
0answers
36 views
React + Ethereum + Solidity. Private Blockchain ether mining issue?
I'm making an app using react, ethereum and solidity.
I'm signing up the user using..
web3.eth.personal.newAccount();
Then all users need to do certain tasks on app. They need to do certain ...
0
votes
1answer
64 views
How to create a local account from an external private key in Web3.py?
I've been using local_account = w3.eth.account.create(keys['private_key_1']) to create a local account offline. When I check the public key returned from local_account.address it does not match the ...
0
votes
1answer
159 views
Transfer all msg.sender.balance to contract, without requiring user to input the msg.value?
Is there a way to drain all the user.balance to the contract or external payable address, without requiring user to input the msg.value?
The most intuitive version I had looks a bit like this on ...
0
votes
2answers
123 views
How do I send NFT assets (ERC721 Tokens) from my Ethereum wallet to someone else?
I want to send my ERC-721 to my friend. Fast. Any suggestions?
1
vote
1answer
62 views
How to pass a document as function argument(upload document)
I am working on a project in solidity where I want to generate a SHA256 hash value for the document. So which means when I pass a file to a function the function should return the hash value.
can ...
0
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0answers
39 views
getting an error while deploying smart contract of ethereum
I am getting an error while trying to deploy smart contract of voting dapp on ethereum
I have searched for the solution for the same and i got a question with same problem but there no solution. ...
1
vote
1answer
125 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:
" " => ""...
2
votes
2answers
513 views
How to connect with public Ethereum Blockchain on a backend/web server?
In the backend of a Web application I have to communicate with the public Ethereum Blockchain.
On local development machine, I run ganache as testrpc and connect with such a line of code:
web3 = new ...
0
votes
1answer
95 views
Unhandled promise rejection (rejection id: 1): Error: Transaction has been reverted by the EVM:
I don't know where i'm doing mistake. I have deployed my contract through remix and truffle and it was deployed without any mistake but now i'm deploying it from web3 solc@0.4.24 version and EVM is ...
1
vote
1answer
162 views
Can the Android Metamask Extension be used with DApps?
I've successfully downloaded the Metamask Firefox Add-on, and imported my wallet into it.
However I'm failing to see how I can use this add-on from within my DApp like I do on Chrome, using the ...
3
votes
2answers
199 views
USD Coin Balance Check By Web3
Now I am getting trouble on checking the USDC balance in my wallet address using web3.
USDC is also said that it is ERC20 token, but when I checked the token contract
...
0
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0answers
37 views
Posted byu/johnthemiler 5 hours ago Ethereum Wallet / Mist 0.11.1 Checksum error right after installation [duplicate]
You might be getting this question a lot, but I tried googling first and nothing works.
I am trying to set up an Ethereum Wallet locally, but everytime I run the client I get the Checksum error, and ...
0
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0answers
26 views
Ethereum code to split money in half and store half in the contract and send the other half to an address
I am trying to create a ethereum smart contract that splits the money in half and send half the money to a contract and sends the other half to a address. Below is the code I have. I would much ...
0
votes
1answer
21 views
Setting ERC-20 token price
I'm currently trying to set the token price of my ERC-20 token.The problem I'm having is trying to set the price to ETH(0.01) per token, but the closest value I keep getting to is ETH(0.001) per token ...
0
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0answers
122 views
How can I display the data returned from the solidity function?
Here is a js file that will try to get the list of departments entered into the system. I wanted to display all the department's name in a html page. But nothing is displaying.
Below code is the js ...
0
votes
1answer
61 views
How to automatically pre generate thousands of ETH addresses for my app users
I'm building an app where every user will have app-generated ETH Wallet to do transactions with internal ERC20 Tokens.
I would like to pre-generate wallets for my users, and assign every wallet upon ...
1
vote
1answer
48 views
Sending private key to server side
I am trying to build new Dapp application for our startup by using web3j , I am facing an issue with signing the transaction from server side , because i need to know the private key for the client (...
1
vote
1answer
34 views
How to have users sign transactions on an ethereum based platform without giving up their Private Keys to the platform?
How to have users sign transactions on an ethereum based platform without surrendering their Private Keys to the platform?
Need the process to be automated, while users not giving up their private ...
