Questions tagged [ethereum-wallet-dapp]

Tag for the questions related to the deployment of the contracts using Ethereum wallet.

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1answer
654 views

ERC223 Token Fallback Function Usage

I'm currently writing the "Trade" smart contract which is similar to "Crowdsale" smart contract. The only function that I want to add is "sell" function. In general Crowdsale smart contract is used ...
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1answer
296 views

Ethereum wallet and private key [duplicate]

how to generate public and private key for each user on my decentralized app? After filling the app on ethereum network?
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1answer
46 views

This contract does not implement all functions and thus cannot be created? I am very new to solidty . Any help highly appreciated

pragma solidity ^0.4.0; contract contracta{ uint mapsize=10; struct request_task{ uint task_id; string ip_address; uint flag ;// submited, 1, excuteding, 2, finished, 3, failed ...
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1answer
1k views

create ether wallet using nodejs

I have implemented the code which is creating new wallet but I am not able to get the private key of that wallet. Can anyone tell me like what is the proper way in which I can create new wallet which ...
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3answers
58 views

How to do transaction on a dapp without any wallet

I am able to do a transation in my private nework using geth console. But I want to the transaction on a dapp without using any wallet
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1answer
86 views

How to create a wallet address (say) for a user sign up with any password of user choice and login next time with the same password?

I want my dapp to allow a new user when submitting a sign up to create an ethereum address with his provided password of his choice and next time when he logs into dapp, he must be able to login with ...
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1answer
195 views

Ropsten account address

When using for example ropsten testnet as a provider like https://ropsten.infura.io/<infura_token> How do I identify the account address of my transactions?
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1answer
216 views

Ledger nano s unrecoverable - have ethereum private keys - How do I get this ETH?

Lost the 24 word recovery sheet, and the pin number... I"ve resolved that the BTC is gone, but if I opened in myetherwallet - and produced private key and UPC code - I'm told I could get the ETH ...
-6
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4answers
166 views

Solidity unit verification?

1 Ether = 1000000000000000000. //The ether price in wei I know this price in wei.It is may be in other smallest unit of gas like Kwei, Ada, Femtoether or Finney, Milliether,Milli.So, solidity code ...
1
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2answers
413 views

Is the Gas Fee refunded if the transaction fails?

I'm confusing the rule of paying gas fee when caller makes a transaction. The gas fee is needed when the transaction is made and I know that the require() is the guard function that returns all the ...
2
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1answer
1k views

What is a Erc20 (UBT) token I received in my wallet according to EtherScan?

I look in my EtherScan and it says that 5 days ago and 10 in value I received a token called Erc20(UBT) and I click on it, it's a Universal Bonus Token that came from an address = 0x00000000000... ...
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2answers
706 views

how ipfs work in ethereum blockchain [closed]

currently i am learning ipfs and ethereum based blockchain technology,I wanted to know can we store data on ethereum blockchain and yes then how. and also wanted to know how exactly ipfs work for ...
-1
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1answer
148 views

Documenting an DApp components

I am new to building decentralized applications and i am trying to document the process of building an DApp. Waht are the components as well as installations that are needed to build An Dapp ? (if is ...
2
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3answers
480 views

How can i transfer erc 20 tokens manually in bulk?

Can anyone help me with how to transfer tokens manually in bulk?as i have to transfer tokens to multiple ETH addresses but cannot waste time transferring it one by one.
1
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1answer
171 views

where impelement web3 services : backend or fronend? [closed]

I am developing a social-media-like application based on ethereum blockchain and some use cases are controlled by smart contracts. so to communicate with smart contract I have to deal with web3. ...
0
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2answers
505 views

How to call a function of a deployed smart contract in ethereum from another smart contract?

I have a smart contract deployed at a particular address(say, 0xABC). This contract is ERC20 token(say, ABC token) smart contract. This contract was deployed on **Nov 2017.** Now I want to have ...
0
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1answer
170 views

what is ERC20 ERC20 token = ERC20(_tokenAddress)

How can I call transfer function of a ERC20 token contract from another contract? in this question there is one answer from pabloruiz55 but in this example or demo code ERC20 token = ERC20(...
0
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1answer
110 views

Ethereum full stack application development

I am novice solidity developer and I am trying to develop a voting application on ethereum Requirements of application are - 1) There should be candidate and voter registration form 2) Voter ...
0
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0answers
253 views

How to synchronize with the test network in Ethereum Wallet?

I'm beginning with Ethereum Wallet to deploy the smart contracts. I utilize Rinbery testnet to work. Unfortunately, for the moment I don't possess any amount of Ether to deploy the contracts. Then I ...
3
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1answer
353 views

Creating new account from web3 showing error

while creating new account from angular using web3 personal.newAccount function() undefined import { Injectable } from '@angular/core'; import { User } from './login/user'; const Web3=...
0
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1answer
39 views

Is an Ethereum paper wallet generator considered a dapp?

I made an Ethereum paper wallet generator. Is this considered a dapp as it can be downloaded and run without any central server to generate ethereum addresses? Or does a dapp have to be tied to a ...
1
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0answers
54 views

Derive additional accounts from private key

Im building a dApp and during account creation I can generate an address as well as private/public (extended) keys. What i want is to be able to generate further accounts after the seed is no longer ...
0
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1answer
126 views

Fetch the mapping variable history from Ethereum blockchain

I am using ganache and truffle for building DApp, In my smart contract, I have declared one mapping variable, now in function I am assigning some value to that mapping variable. Every time I am ...
0
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1answer
52 views

Can ERC-20 Token be attained/transfered based on actions?

I had a quick question about an abnormal ways to buy ERC-20 Tokens and hear if this is technically possible. Let's assume there is a smart contract that generates and holds ERC-20Token called '...
1
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0answers
150 views

how users interact with deployed smart contract in ethereum wallet/Mist browser?

What is the next step after contract deployment in ethereum wallet? i have implemented crypto currency using this tutorial. link to tutorial and successfully deployed. How this contract will use ...
2
votes
2answers
190 views

While using myetherwallet to generate offline transaction hash, can developer steal my private key?

To be very clear, I have used myetherwallet offline to send eth many times in the past. I went through the code for the version I saved and found no Maliciously code. Hypothetical for future ...
1
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1answer
733 views

How to get Ether in Ethereum Wallet test network?

How can I get some ether to deploy a smart contract when using a test network (like Ropsten, or Rinkeby) in Ethereum Wallet ? Because at the beginning when creating a new account, I have 0.00 ether ...
1
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2answers
496 views

Call array variable from solidity contract in web application

I have declared one array inside solidity contract like "uint256[] public machineList; " and initialize the values of that array inside the constructor. But when I call that array inside js usgin ...
0
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1answer
35 views

ETH stuck in MIST (MAC)

i have a big problem i can't solve myself. my parents bought eth a while ago and stored it on their (old) mac (mist wallet). the wallet wasn't updated half a year or something. unfortunately the mac ...
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0answers
41 views

Geth in non-mining mode and Etherem Wallet

If I start Geth node this way: /home/porton/bin/geth --datadir ~/private_ethereum_blockchain --networkid 100 --nodiscover --nat none --mine --minerthreads 1 --ipcpath /home/porton/.ethereum/geth.ipc -...
1
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1answer
77 views

Deploying Smart Contract with Oraclize to the test net

I'm having difficulty deploying my contract to the Rinkeby TestNet. I made a local copy of the Oraclize API and saved it here:n//Users/simon/Documents/usingOraclize.sol In the Ethereum Wallet ...
0
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1answer
34 views

API for Gas Transection [duplicate]

I am trying to make a D'app. But I don't know how to fix this issue of paying gas every time. Do the user or owner need to pay everytime they use the application ? can we make it default gas by some ...
1
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1answer
234 views

How to access Mist transaction logs?

I have a private blockchain deployed on one machine and Mist & Ethereum Wallet on another machine. Both the machines are connected through RPC. I have made a simple smart contract which adds two ...
0
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2answers
235 views

Running web3 from node.js powershell in none Administrator mode always shows an error

I am using Windows and installed web3js as general option "npm install web3@0.20.2 -g" using Windows powershell. I run powershell as administrator. After installation i am able to get web3 object ...
1
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0answers
75 views

How to run multiple instances of Ethereum Wallet simultaneously on a Windows machine?

When I do Ethereum development, I'd like the run multiple instances of Ethereum Wallet at the same time on my work machine. For example, I have a ganache development node server, a private-net server ...
1
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2answers
541 views

Solidity Help - Undeclared Identifier - onlyOwner WithdrawEther

I'm new to Solidity and attempting to add a withdraw ether function for my contract which enables me to release funds the parent contract account, but the compiler (remix) keeps on giving me an ...
0
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2answers
1k views

How to make transactions without metamask

My account has enough ether to make a transaction. How do i call a payable function that is written in solidity? I tried by calling like this const Web3 = require('web3'); const HDWalletProvider ...
0
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2answers
721 views

How to create a own ethereum wallet

Is that possible to develop a own ethereum wallet without metamask that should connect to main ethereum network. Just like in blockchain.info user clicks the account by just giving email address and ...
3
votes
1answer
140 views

Is it possible to have separate eth receive address with each user

I want to accept ethereum from a crowd for selling something from my webpage. I want each individual to send ethereum on an assigned receive address. Is it possible to assign separate ethereum address ...
0
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1answer
170 views

Main wallet of an account? [duplicate]

In Solidity there is msg.sender whose value may be used to send Ether to the sender of the msg. How the wallet to send money is chosen when the sender has several Wallets? Is there concept of ...
2
votes
1answer
9k views

How to extract private keys from Ethereum Wallet? [duplicate]

How to extract private key of an account from Ethereum Wallet on Linux? Please specify the exact filesystem locations. I need private keys both for the main network and for the Ropsten test network.
1
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1answer
84 views

Need help with start mining(I am getting like this)

I am new to ethereum private blockchain System information: geth version:1.8.2 os&version:linux synopsis: when i tried to connect peers to my private blockchain it showing like WARN [03-20|11:...
0
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1answer
60 views

Transferring files over blockchain from ropsten-test network

I am new to blockchain and working on a university project. I am trying to simply buy and sell music over the blockchain. Currently I am using a string to act as the 'transaction', but learnt this ...
1
vote
1answer
550 views

Can not deposit ether into a contract

I tried to build a basic contract from some resources but failed to deposit the ether into this contract. Following is my code, is it correct that "msg.value" and "address(this).balance" be 0 at any ...
2
votes
2answers
501 views

ganache-cli issues: - How to retrive old ganache-cli account once cmd window close

I am using ganache-cli....and it is providing me 10 test accounts with 100ETH balance. when I close that cmd and start ganache-cli it creates new 10 test accounts every time. So how to retrieve my ...
0
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2answers
47 views

Integrate more then one user with one ethereum account

I have many users inside the organization and I want to use same ethereum account for all the users , but with different usernames, so it there anyway to do that ?
2
votes
1answer
331 views

Digital asset management dapp using Ethereum

I am new to ethereum and also I have tried out some examples for building smart contract using truffle and ganache. But I want to make Digital asset management dapp using ethereum. Like, if have I ...
1
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2answers
498 views

Do we have an API for airdrop

I am creating an news app which will show the ICO and Airdrop details. Is there is any API for Airdrop news ?
0
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1answer
266 views

how to import UTC-JSON file through web3-eth methods

hey I am working on ethereum wallet. in this i want to import my account through UTC json file, but i didn't find any solution for this in web3-eth command someone can please help to find out the ...
0
votes
1answer
155 views

DeclarationError: Identifier not found or not unique when deploying a facotry contract

I am using truffle with angular to write DAPP. I have a factory contract which will deploy an other contract named rental through a function called newContract. here is my factory contract pragma ...