Questions tagged [ethereum-wallet-dapp]

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

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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 ...
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34 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=...
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1answer
61 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 ...
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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 ...
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30 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, ...
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1answer
25 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 ...
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32 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 ...
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1answer
49 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 ...
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33 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 ...
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38 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 ...
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244 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?
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59 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. ...
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1answer
124 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 ...
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27 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 ...
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1answer
44 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 ...
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212 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 ...
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2answers
25 views

Compilation error in ethereum wallet

I am trying to compile the example contract in https://ethereum.org/token and following along with the instructions. The Ethereum wallet cannot compile it though. I get the following error message ...
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11 views

Ethereum wallet not deploying token

I have finished coding my token with the Ethereum wallet, I went through the code and it is all correct, as I am getting no error. However, the contract is not the deploying. Instead the ethereum ...
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68 views

Error use account to deploy the smartcontract: Send

let accounts; let inbox; beforeEach(async () => { //get a list of all accounts accounts = await web3.eth.getAccounts(); //use one of those accounts to deploy the contract inbox = ...
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1answer
82 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 *...
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43 views

Function works on ethfiddle but reverts in mist

I've had this occur a few times, where I create a smart contract and one of the functions works in ethfiddle but reverts in Mist. I realized that in the Mist wallet, when I run the functions that fail,...
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1answer
121 views

Decoding Hex value in solidity

I am trying to view values stored on my ethereum contract using ethereum wallet. Currently the values are being placed onto the contract in hex format. Is there a way to decode them on the contract so ...
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1answer
113 views

Invalid JSON Response while connecting DApp, Metamask and Backend

I am getting some error(picture below) while trying to connect DApp with a backend. One day ago, everything worked fine, now I got an error: "basic auth failure". Contracts are deployed on Ropsten ...
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2answers
69 views

Blochchain Smart Contract App

Actually Im working on a blockchain application based on smart contracts that allows to buy/sell properties and paying in cryptocurrency using Ethereum and Bitcoin. I wonder I develop smart contract ...
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1answer
252 views

To handle emitted events from solidity in javascript in truffle suite

The function I am accessing will emit events i need to use that event but the function is a transaction when i am accessing the event it turns as promise pending . So suggest me some methods. thanks! ...
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1answer
41 views

Ethereum Smart Contract with Custom Fee and Percentage of the collected Fee Distrusted token holder

I wanted to know is there a possibility to create a smart contract for a token wherein the transaction fee could be overridden with the network fee and the fee collected on the transaction can be ...
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1answer
295 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 ...
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1answer
64 views

Unable to Generate Address Endpoint Blockcypher

I am trying to generate an address using Blockcyphers Address Endpoint using cUrl. - https://api.blockcypher.com/v1/eth/main/addrs?token=eth But it returns this error - "Endpoint not found. Please ...
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1answer
231 views

How to map multiple time and index value on same address

I wish to map the time to the address key. But currently it is working on the index key only. I just want to map time as well. Means the current time. So that I can able to get the record with time as ...
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1answer
55 views

acess variable from token contract to ico contract , both placed in diffrent files

//token.sol pragma solidity ^0.4.24; /*import "./Ownable.sol"; */ contract ERC20Interface { function totalSupply() public constant returns (uint); function balanceOf(address tokenOwner) ...
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1answer
206 views

How to read previous blocks data?

I'm new to block chain technology. I'm trying to store and read blocks using testRPC along web3.js. I'm able to get the latest block data but not able to fetch previous blocks data. Please some one ...
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1answer
326 views

Uncaught Error: CONNECTION ERROR: Couldn't connect to node web3.min.js:1 http://localhost:8545

**Hi, I am doing a sample project on Ethereum where 2 fields ( Emp name, Emp Id) will be taken from the UI and set those values using a smart contract and show the values back to UI. Getting below 2 ...
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1answer
210 views

Infura API for mobile(ionic) app

I have one little question. Suppose I have private key of user in ionic app. Is this enough to make transactions using infura API and web3?
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1answer
55 views

How to create withdraw token requests on my custom token sale dashboard

I created a token sale dashboard. Users can send BTC,LTC,ETH to dashboard. When user send BTC, LTC or ETH to dashboard, they get tokens to their dashboard budget (offchain) based on current token ...
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1answer
195 views

Metamask stuck at Unknown network ID

I'm getting unknown network ID error on transferring a token in meta mask as in the image below. I'm using local network with ganache. I can transfer from metamask account to another after ...
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2answers
92 views

miner.start() cannot deploy my contract

My environment: geth 1.8.11 Ethereum Wallet Mist Browser windows 10 I try to deploy a new contract in the Ethereum Wallet. I execute (miner.start();) in the Geth JavaScript console to get some ...
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1answer
592 views

Error in Ethereum Wallet:“Couldn't estimate gas, resorting to default parameters. Transaction is likely cheaper than the estimate”

I am using ethereum wallet for deploying contracts in my private blockchain. But whenever I try to send a transaction in my ethereum wallet it shows an error that says, "Couldn't estimate gas, ...
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1answer
54 views

Do we have to compile and deploy our contract to ethereum each time we start a test rpc?

I'm trying to develop a voting application, I have successfully compiled the app and also deployed it to ethereum blockchain. Now I've closed the test rpc and node console, and when I restarted node ...
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1answer
66 views

How to handle exceptions in ethreum private network using revert(),throw

I am running a private ethereum network using geth --rpc --rpccorsdomain "*" --datadir ./chaindata --port "30330" --nodiscover --rpcapi "db,th,net,web3" --networkid 2010 init genesis.json and ...
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1answer
14 views

ETH to Tokens Without Wallet

I wanted to buy tokens with ETH and send directly from my brocker to the token selling company, the transaction failed. is there a way to recover my ETH?
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1answer
280 views

Use injected metamask inside of an ionic app

Ive seen this topic mentioned on the ethers of stack exchange before and mostly these questions go unanswered but being that ionic is basically a fancy webview I am wondering if anyone has managed to ...
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1answer
30 views

Conflict in smart contracts

How is conflict handled in the case of smart contracts .For eg -in the case of an insurance smart contracts,there might be conflit between both parties.How does blockchain ensure the validity of ...
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2answers
42 views

Can you store anything other than Eth in one wallet

Total newbie to blockchain. I want to use ethereum to store information and not so much currency. For example, I want to create a game where I can store someones point. Can the wallet address store ...
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3answers
64 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
251 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 ...
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262 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 ...
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1answer
62 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 ...
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2answers
48 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 ?
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1answer
282 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 ...
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1answer
89 views

how to transfer token with timestamp to restrict token transfer

I am working on basic ERC20 token smart contract and i would like to add some conditions in token transfer Suppose, I transfer 100 tokens to receiver on 2018-03-01 then receiver can't sent that 100 ...