Questions tagged [ethereum-wallet-dapp]

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

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25 views

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
16 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
75 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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1answer
2k views

Mist error: “unable to connect to socket:timeout”

In mist wallet i am getting an error of unable to connect to socket and couldn't compile source code.Do help me where i am doing the mistake.
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1answer
42 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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1answer
243 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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0answers
14 views

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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2answers
2k 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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2answers
56 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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1answer
21 views

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
99 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
58 views

how to be notified about incoming transactions instantly?

I'm creating a platform which users are able to receive ETH on their own wallets (addresses). They will give the addresses to others, but the question is how can I be notified that new transactions ...
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2answers
166 views

When I recreate an Account using a Mnemonic, will it also bring back its private key?

I guess my Question is straight-forward, I would like to know if using a Mnemonic to recreate or import an Ethereum (external) Account will actually make or "bring back" the whole KeyPair (public and ...
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1answer
13 views

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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2answers
35 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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1answer
68 views

interact with a smart contract without having a wallet

I have a smart contract that basically store a document and I integrated it with a user interface that let the user go to the website and search for that document .. very simple idea. I want to let ...
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1answer
19 views

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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1answer
11 views

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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1answer
30 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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0answers
83 views

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
34 views

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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0answers
152 views

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
24 views

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
41 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
101 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
17 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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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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1answer
44 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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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
72 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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0answers
13 views

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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2answers
525 views

web3.js new accounts without local node!

I am trying to develop an dapp, but since I am running a small server (Windows Sever 2012 R2) with limited space I don't want to host/install an ethereum node, nor geth in my server, because as many ...
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1answer
254 views

Metamask stuck at Unknown network ID when trying to interact with local Ganache network

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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0answers
13 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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0answers
19 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
44 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
108 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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0answers
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
26 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
18 views

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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3answers
844 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 ...
2
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1answer
328 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
111 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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2answers
630 views

Truffle Develop Could not find suitable configuration file

Basically, after I installed the truffle the command: nom truffle -g . Then I went to set up the metamask on the google chrome. Once the metamask is set up then I try the command: truffle develop and ...
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0answers
9 views

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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0answers
44 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
52 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
45 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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1answer
65 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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