Questions tagged [ethereum-wallet-dapp]
Tag for the questions related to the deployment of the contracts using Ethereum wallet.
619
questions
0
votes
1answer
24 views
Create self-airdrop to 20,000 wallet addresses with specific conditions
I want to create an aidrop to my ERC20 token with automatic distribution:
-The user must therefore send 0 ETH to the smart contract or to a specific address, and he will automatically receive his ...
0
votes
1answer
20 views
How can i make payment application using the blockchain? [on hold]
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
24 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
22 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
26 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
35 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
votes
0answers
23 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 ...
1
vote
0answers
24 views
How to create multiple nodes & interact them with ethereum wallet? [closed]
Need to create private ethereum network with 1 node & it's 2 peers.
0
votes
1answer
32 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
35 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
48 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
86 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
38 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
34 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
votes
0answers
19 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
97 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
372 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
48 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
77 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 ...
2
votes
2answers
74 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
votes
0answers
29 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
votes
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
14 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
votes
0answers
63 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
40 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
30 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 ...
1
vote
1answer
32 views
Ethereum Game design idea
Is it possible to write emacs dunnet game in solidity? Not that there is any reason for the game to be on a blockchain, it is for a class assignment. I tried 2048 game. But it seems to have some ...
1
vote
1answer
30 views
Can you transfer money from a smart contract to an eth address without writing code?
I have an ethereum contract, which linked to a wallet that I control (i.e. I have the private key).
The contract has 241 Ether in it. Is there an easy tool available to get the ether out of the ...
0
votes
2answers
19 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
...
0
votes
0answers
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 ...
0
votes
1answer
28 views
how to generate multiple ethereum addres using Hd wallet?
const mnemonic= 'clown shiver beach wheel this mixture emotion illness fatigue amateur talent bitter'
console.log(0x${hdwallet.derive(m/44'/60'/0'/0/0).getAddress().toString('hex')})
const seed = ...
0
votes
0answers
38 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 = ...
1
vote
1answer
39 views
what is the role of merkle tree in ethereum? [duplicate]
I know the functionality of merkle tree, it makes a root hash from a group of data.My question is how merkle tree is act in ethereum blockchain,precisesly in the place of transaction hash,block hash,...
1
vote
1answer
130 views
HDWalletProvider & truffleconfig: 'truffle migrate' will compile but not do anything else
I am trying to build a React app with Truffle. Firstly, my file structure is like so, with root_dir being the project root directory:
root_dir/node_modules/src/libs/truffle
All of truffle's files, ...
2
votes
1answer
28 views
what is difference in ethereum transaction after constatanople upgrade?
I have heard that Constantinople update transverse the consensus protocol of ethereum from proof of work to proof of stake. So they claimed that this update could speed up the TPS(transaction per ...
1
vote
0answers
37 views
scatter confirmation for sign a transaction?
I have built an dapp. It's almost like twitter where the user can tweet and also use as a microblogging site in blockchain.I have used scatter as transaction signer for using my dapp.
The real problem ...
3
votes
2answers
126 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 ...
0
votes
1answer
59 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 *...
0
votes
0answers
34 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,...
0
votes
1answer
29 views
How do I make my private Ethereum network public? [closed]
So after a lot of reading I was able to make my own private Ethereum network, most of the readings I did showed me how to test it privately, but none of them actually explained how to make it public, ...
1
vote
2answers
63 views
Smart Contract Working on Remix but not TestNet
This question has been asked before. however, those answers did not help me. (of course, I now can't find the "answer" atm) It said that Ropsten (what I was currently using) has fewer miners - or ...
0
votes
1answer
189 views
org.web3j.tx.exceptions.ContractCallException: Empty value (0x) returned from contract
Problem:
org.web3j.tx.exceptions.ContractCallException: Empty value (0x) returned from contract
The code is as follows....
My java:
String owner = managedWalletLookup.getOwner(contractAddress).send(...
0
votes
1answer
48 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 ...
0
votes
1answer
80 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 ...
0
votes
1answer
111 views
web3 reading memory string gives error
i have declared a string variable in struct like
struct test{
string testString;
}
I have written a function to access the variable like
function getteststring(uint256 index)public ...
1
vote
1answer
209 views
Truffle migrate not working
Every time I enter truffle migrate command in the terminal it doesn't do anything but takes some time and nothing happens after that. I am using Truffle version 5.0.4
0
votes
2answers
53 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 ...
0
votes
1answer
41 views
Recover myetherwallet account with json but without password
I have lost my usb stick which contained password for access to my myetherwallet.
Are there any ways to recover that, only thing I have is .json file, can I get from it private key or is there any way ...
1
vote
3answers
32 views
Why I can not trade coins stored in cold wallet?
There are two kinds of wallet hot wallet and a cold wallet. Ideally, people keep minimum balance for trading in a hot wallet and most of the coins are stored in cold wallet. I am wondering why coins ...
