Questions tagged [ethereum-wallet-dapp]
Tag for the questions related to the deployment of the contracts using Ethereum wallet.
0
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19 views
Is there any API for ether sent transaction in ethereum without using web3.js
I want to do a transaction (sent ether or token) by API, not from web3.js
I have tried etherscan, block cypher
This is a get balance API code like this I want send transaction code
...
0
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1answer
19 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
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0answers
15 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
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0answers
19 views
How to create ethereum wallet with multiple node? [closed]
How to to create ethereum wallet with multiple peers for single node?
Need to create private ethereum network with 1 node & it's 2 peers. Each node should have 2 accounts.
0
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1answer
19 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
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0answers
30 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
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1answer
38 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
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1answer
76 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 ...
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2answers
22 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
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1answer
32 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
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0answers
16 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
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1answer
89 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
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2answers
327 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
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1answer
41 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
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1answer
49 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
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2answers
41 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
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0answers
27 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
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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
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1answer
12 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
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0answers
46 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
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1answer
38 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
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1answer
45 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
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1answer
25 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
30 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
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1answer
23 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
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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
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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
23 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
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0answers
33 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
37 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
99 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
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0answers
33 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
93 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
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0answers
31 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
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1answer
28 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
59 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
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1answer
166 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
44 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
72 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
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1answer
90 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
202 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
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2answers
50 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
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1answer
34 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
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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 ...
0
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1answer
31 views
If Address and private key doesn't get stored in Ethereum,then how will it validate users?
I think in a normal database,the username and password gets stored in the database and when a user enters his/her credentials,it checks with the content in the database to know his/her Authenticity.
...
0
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1answer
103 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!
...
1
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1answer
21 views
I want to change 17k addresses password on ubuntu server
I have 17k ethereum addresses. I want to change passphrase all of them. Are there any way to change all addresses passphrase?
geth account update 0x... It is really hard to change 17k addresses ...
0
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0answers
569 views
Type address is not implicitly convertible to expected type address payable [duplicate]
Can you please help me out how to explicitly convert address to address payable as i am using solidity compiler above 0.5 its asking me to have address payable when i use transfer().
