Questions tagged [ethereum-wallet-dapp]

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

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16 views

How I compile dapp in browser just like I used to compile my Visual Studio code using xampp in my browser?

Whenever I create/ edit some project on my Visual studio code, I put it inside htdocs of xampp folder. Then I start Xampp control panel and give it some localhost port number so that I would compile ...
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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 ...
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How to show token balance from a ETH address in my Android App?

I have an Android App and I want to show the balance of an especific token of the user wallet Address IE: show how many CHAINLINK are holding the user on his wallet Thanks in advance
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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 ...
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User login in ethereum based voting dapp

I am trying to build an ethereum based voting DAPP for my university project. My proposed system is for the university club and society elections. I am using ganache cli, truffle framework and node js ...
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1answer
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how come i can generate keys using bip39 with only one words as seedphrase/mnemonic without any error?

Seed phrase/mnemonic is supposed to be 12 words or 24 words but I am able to generate keys with single word seed phrase using bip39 library without any error? what is happening here? how is this ...
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1answer
15 views

Does Ethereum 2.0 have privacy on state variables?

I know in 1.x state values were visible to anyone on the network. With the release of 2.0, is there still no privacy? Also I understand 2.0 is being released in phases. Is there a timetable with the ...
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1answer
30 views

buyTokens throws error when is is getting called

Whenever I the buyTokens function is getting executed, I am getting below error Reason provided by the contract: "ERC20: transfer amount exceeds allowance". Debug the transaction to get more ...
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any one please help when show QR for receiving erc20 token

any one please help when show QR for receiving erc20 token can i enter amount like "ethereum:ethaddress?address=contractaddress&uint256=token" not working "ethereum:...
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Can not Open Ethereum Wallet on Window 10

I did trying install soft Ethereum wallet on windows 10, But I can't open the program. It looks like the picture below. Help me pls, Thank everyone.
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1answer
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Eth address created from an outdated version of MEW off line

Hello I have MEW off line client 3.7 (2018 version) on an airgapped computer Since the new client doesn't let me create new ethereum wallets offline (it blocks itself (idle) while creating it) can I ...
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1answer
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tokenMock.mint is not a function(tokenMock is the deployed Smart Contract)

I am creating a new Blockchain wallet with ERC20,but during migration,i am getting the error that tokenMock.mint is not a function(tokenMock is the deployed contract) I am sending the tokens to my ...
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“Migrations” — sender account not recognized

This is my truffle.js i've removed the credentials marked as * var HDWalletProvider = require('@truffle/hdwallet-provider'); var fs = require('fs'); var infura_apikey = "*" var mnemonic = &...
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1answer
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how to create an address or wallet in several tokens

Hello community I am using nodejs and web3, I would like to know if it is possible to create an address in each token and then bring the corresponding balance of each token
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public token swap contract

i want to create an erc20 token swap contract for a crowdsale im building right now. and i dont want to accept ether, i prefer USDT. i found a swap contract example on the internet but it always asks ...
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1answer
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Which method is efficient to log data in blockchain? Send an event via smart contract or send data in a transaction without value?

I want to log data in Ethereum block-chain. It is obvious that we can create a smart contract that emits events and retrieve data from it. But is sending a transaction with data but no ETH value (just ...
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How to debug this metamsk error ? - Error: [ethjs-rpc] rpc error with payload:

I have a DApp integrated with metamask and ganache, front-end built on react. I am getting this error when I interact with the smart contract from front-end, contract send calls. Smart contract ...
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1answer
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i can't figure out why i keep getting this parser error

pragma solidity ^0.5.13; contract WorkingWithVariables { uint256 public myUint function setMyUint(uint_myUint) public { myUint = _myUint; } bool public mybool; ...
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1answer
36 views

My Transaction has failed [closed]

I have transferred 0.11 ethereum to wallet today morning 0x5acc84a3e955Bdd76467d3348077d003f00fFB97 But it has failed. Now what i have to do. Whether the amount will be returned back to my wallet. ...
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1answer
43 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 ...
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1answer
54 views

Compilation Error

Hi guys I got this error when I try to compile using truffle develop. truffle(develop)> compile Compiling your contracts... Compiling ./contracts/StarNotary.sol /mnt/d/Blockchain/...
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1answer
15 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';...
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1answer
36 views

How can we lock ETH in user wallet without escrow contract?

I know the logic of using an escrow contract in which 2 or more users send their wagered ETH to a smart contract acting as escrow proxy, and then after some decision contract executes we release the ...
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32 views

Getting an “ Unhandled promise rejection” error when making transaction from account1 to a contract

I keep getting a Promise Rejection error whenever I make a transaction from account 1 to a contract. The contract is used to send ether to account 2 when it receives ether from account 1. For security ...
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0answers
23 views

where to host express api that communicates with smart contract to be fully decentralised?

I need to host express api that communicates with smart contract to be fully decentralised. Any to host it decentralised.
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1answer
52 views

Fundamental question! (HD Wallet private key hacked) [closed]

What is the probability of the mnemonic or privatekey of the HD wallet being hacked? It is being used as a wallet created by metamask. The user is using a wallet with a private key backed up by ...
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1answer
20 views

Different kind of Wallet/Addresses/Accounts

I have a few questions regarding crypto wallet accounts and currencies. Recently I came across https://www.bitaddress.org/. This website generates bitcoin wallets. Now, when I tried to verify that ...
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I’m trying to build a versioning System using IPLD and IPFS .Is it possible to publish hashes from multiple users to the same IPLD object?

I’m using Ipfs-api from Infura for interaction .I’m able to create and upload files to the Ipld object .I want to store different versions of the same file on the object.These versions can be ...
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11 views

Writing a function, where users are allowed to deposit their token

i want to create a smart-contract, where it is allowed for users to deposit their ether/tokens in. As far i researched i found this function to get it happen. address owner; // this is where you ...
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1answer
34 views

Gnosis Wallet - Multisig not really working as multisig

I'm trying to create a MultiSig wallet for both ETH and ERC20. After doing some research, I found Gnosis, which seemed to fill my need. First I tried to download the local (electron-based) version. ...
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16 views

In EtherJs how to find account number of balance change event?

I am creating Ethereum Wallet application & I am using EtherJs for Web wallet development. When I try to listen for Balance Change event for multiple accounts then How do I find account number ...
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1answer
34 views

Ethereum stores its own data, how to synchronize the data to other nodes in the future

I use smart contracts in Ethereum to store some string data, how to synchronize these stored string data to other nodes. As far as I know, these string data are stored in the node's leveldb database, ...
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1answer
34 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 ...
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1answer
82 views

DApp examples containing complete source code

can someone provide me some high quality ethereum dapp codebase examples? This should comprise of not only the smart contract codebase but also the app codebase , complete with the front end UI (...
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14 views

What is a good wallet service for iOS applications

I am building an iOS app that rewards users with crypto tokens, just like Brave's BAT or Reddit's community points. I am trying to find a wallet service that I can integrate with my iOS app for users ...
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1answer
22 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 ...
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0answers
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vyper no mappings allowed when adding a function to initialize a struct that has a map inside

Version Information vyper Version (output of vyper --version): 0.1.0b17+commit.eaa6754 OS: Debian GNU/Linux 10 (buster) Python Version - 3.6.2 Environment (output of pip freeze): asttokens==2.0.3 ...
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1answer
34 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" ...
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1answer
36 views

Receiving error while getting state variable value after using selfdestruct method “Error: Returned values aren't valid, did it run Out of Gas?”

I am using selfdestruct method and passing the payable address to it but receiving the following error when trying to get the value of a state variable : "Error: Returned values aren't valid, did it ...
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2answers
1k views

How can I change the 12 word phrase in my trust wallet?

I created a ETH trust wallet on my phone for someone and he has now imported the trust wallet to his phone. Is there any way to change the 12 word phrase or somehow give the sole control to the ...
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How can I recover STO tokens transferred to a private wallet? [duplicate]

I have the full Ox number and transaction code.. Beginner at all this - any help or insights very gratefully received. As and when retrieved, 20% finders fee offered..thanks, Nick
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35 views

Address generate with xpub key

Hy everyone, I'm doing a hd wallet generator (normal child) with only use xpub key. Therefore, can someone help me pls. With library of golang or main flow of generating from: (xpub key, index) -> ...
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1answer
28 views

I am having trouble transferring my coin from coin-base wallet to coin-base pro

Hello guys i am trying to transfer my coin from coin-base wallet to coin-base pro. it shows me a message " you are trying to send an erc20 token which are issued on the Ethereum blockchain. This mean ...
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1answer
27 views

How do I develope a QR code for a 64 character hex string generated ethereum address?

I am learning about how the 64 character hex string generated Eth Address is formed. Is there a program for this?
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1answer
203 views

Refresh page upon MetaMask Confirmation. Web3js & React()

I would like to reload the React Web3 wallet's page upon MetaMask Confirmation. Meaning when the ERC-20 token send transaction is confirmed, the page should reload or state should update to display ...
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1answer
52 views

Why Ethereum based Dapps don't use WebAuthn

According to EOSIO they are able to use WebAuthn: Support for WebAuthn, a W3C web authentication protocol WebAuthn is a standard for strong user authentication collaborated on by the World Wide ...
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1answer
22 views

List all transactions to: and from: this.state.account in chronological order web3js

I'd like my Web3 wallet to list all transactions to: and from: this.state.account in chronological order, currently I am getting a split of transactions, from: listed first and then to: listed second, ...
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2answers
34 views

List Ethereum transactions to: and from: in one const

I would like to list all the transactions to and from my ERC-20 Ethereum address, i can only seem to list to or from, but not both at the same time. Is there another filter I could use or way to re-...
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1answer
193 views

Transactions Stuck. Offline transaction cancelling is not working either

Transaction is stuck pending, so I used Myetherwallet to generate an offline transaction with the same nonce as the pending transaction, YET once the transaction is posted, I see that the nonce ...
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49 views

ERC721 Token abstract contract or an interface and cannot be deployed

after reading many post i can't found the issues about this Smart contract who compile but it think i miss something about the inheritance and the Abstract contract. This is the SC : // solium-...

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