Questions tagged [ethereum-wallet-dapp]

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

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1answer
118 views

Fetch the mapping variable history from Ethereum blockchain

I am using ganache and truffle for building DApp, In my smart contract, I have declared one mapping variable, now in function I am assigning some value to that mapping variable. Every time I am ...
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1answer
50 views

Can ERC-20 Token be attained/transfered based on actions?

I had a quick question about an abnormal ways to buy ERC-20 Tokens and hear if this is technically possible. Let's assume there is a smart contract that generates and holds ERC-20Token called '...
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146 views

how users interact with deployed smart contract in ethereum wallet/Mist browser?

What is the next step after contract deployment in ethereum wallet? i have implemented crypto currency using this tutorial. link to tutorial and successfully deployed. How this contract will use ...
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2answers
179 views

While using myetherwallet to generate offline transaction hash, can developer steal my private key?

To be very clear, I have used myetherwallet offline to send eth many times in the past. I went through the code for the version I saved and found no Maliciously code. Hypothetical for future ...
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1answer
678 views

How to get Ether in Ethereum Wallet test network?

How can I get some ether to deploy a smart contract when using a test network (like Ropsten, or Rinkeby) in Ethereum Wallet ? Because at the beginning when creating a new account, I have 0.00 ether ...
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2answers
460 views

Call array variable from solidity contract in web application

I have declared one array inside solidity contract like "uint256[] public machineList; " and initialize the values of that array inside the constructor. But when I call that array inside js usgin ...
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1answer
34 views

ETH stuck in MIST (MAC)

i have a big problem i can't solve myself. my parents bought eth a while ago and stored it on their (old) mac (mist wallet). the wallet wasn't updated half a year or something. unfortunately the mac ...
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0answers
39 views

Geth in non-mining mode and Etherem Wallet

If I start Geth node this way: /home/porton/bin/geth --datadir ~/private_ethereum_blockchain --networkid 100 --nodiscover --nat none --mine --minerthreads 1 --ipcpath /home/porton/.ethereum/geth.ipc -...
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1answer
74 views

Deploying Smart Contract with Oraclize to the test net

I'm having difficulty deploying my contract to the Rinkeby TestNet. I made a local copy of the Oraclize API and saved it here:n//Users/simon/Documents/usingOraclize.sol In the Ethereum Wallet ...
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1answer
34 views

API for Gas Transection [duplicate]

I am trying to make a D'app. But I don't know how to fix this issue of paying gas every time. Do the user or owner need to pay everytime they use the application ? can we make it default gas by some ...
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1answer
208 views

How to access Mist transaction logs?

I have a private blockchain deployed on one machine and Mist & Ethereum Wallet on another machine. Both the machines are connected through RPC. I have made a simple smart contract which adds two ...
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2answers
220 views

Running web3 from node.js powershell in none Administrator mode always shows an error

I am using Windows and installed web3js as general option "npm install web3@0.20.2 -g" using Windows powershell. I run powershell as administrator. After installation i am able to get web3 object ...
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0answers
74 views

How to run multiple instances of Ethereum Wallet simultaneously on a Windows machine?

When I do Ethereum development, I'd like the run multiple instances of Ethereum Wallet at the same time on my work machine. For example, I have a ganache development node server, a private-net server ...
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2answers
450 views

Solidity Help - Undeclared Identifier - onlyOwner WithdrawEther

I'm new to Solidity and attempting to add a withdraw ether function for my contract which enables me to release funds the parent contract account, but the compiler (remix) keeps on giving me an ...
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2answers
1k views

How to make transactions without metamask

My account has enough ether to make a transaction. How do i call a payable function that is written in solidity? I tried by calling like this const Web3 = require('web3'); const HDWalletProvider ...
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2answers
656 views

How to create a own ethereum wallet

Is that possible to develop a own ethereum wallet without metamask that should connect to main ethereum network. Just like in blockchain.info user clicks the account by just giving email address and ...
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1answer
119 views

Is it possible to have separate eth receive address with each user

I want to accept ethereum from a crowd for selling something from my webpage. I want each individual to send ethereum on an assigned receive address. Is it possible to assign separate ethereum address ...
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1answer
148 views

Main wallet of an account? [duplicate]

In Solidity there is msg.sender whose value may be used to send Ether to the sender of the msg. How the wallet to send money is chosen when the sender has several Wallets? Is there concept of ...
2
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1answer
8k views

How to extract private keys from Ethereum Wallet? [duplicate]

How to extract private key of an account from Ethereum Wallet on Linux? Please specify the exact filesystem locations. I need private keys both for the main network and for the Ropsten test network.
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1answer
84 views

Need help with start mining(I am getting like this)

I am new to ethereum private blockchain System information: geth version:1.8.2 os&version:linux synopsis: when i tried to connect peers to my private blockchain it showing like WARN [03-20|11:...
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1answer
59 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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1answer
455 views

Can not deposit ether into a contract

I tried to build a basic contract from some resources but failed to deposit the ether into this contract. Following is my code, is it correct that "msg.value" and "address(this).balance" be 0 at any ...
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2answers
459 views

ganache-cli issues: - How to retrive old ganache-cli account once cmd window close

I am using ganache-cli....and it is providing me 10 test accounts with 100ETH balance. when I close that cmd and start ganache-cli it creates new 10 test accounts every time. So how to retrieve my ...
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2answers
45 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 ?
2
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1answer
310 views

Digital asset management dapp using Ethereum

I am new to ethereum and also I have tried out some examples for building smart contract using truffle and ganache. But I want to make Digital asset management dapp using ethereum. Like, if have I ...
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2answers
457 views

Do we have an API for airdrop

I am creating an news app which will show the ICO and Airdrop details. Is there is any API for Airdrop news ?
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1answer
237 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
143 views

DeclarationError: Identifier not found or not unique when deploying a facotry contract

I am using truffle with angular to write DAPP. I have a factory contract which will deploy an other contract named rental through a function called newContract. here is my factory contract pragma ...
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1answer
43 views

Incorrect Values for total supply/distributed amount

I am working on releasing a token on Eth and have been tinkering with some code to allow the token to be claimed via people sending 0 eth to the contract address. So far I have managed to implement ...
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1answer
81 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 ...
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4answers
603 views

Creating a Secure android wallet application using web3 js

I'm new to ethereum and geth. I just want to know that my current architecture or solution to make a new Android wallet in secure way. Mobile wallet -> sends private keys over https -> REST API(Node ...
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1answer
112 views

Sending Ether from private Geth node to Mist Account

I have Sended Ether from my private geth node to an another account created by metamask. I have choosed custum RPC to metamsk, with the valide IP and Port, Also i have activated rpc in my geth node. ...
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2answers
949 views

How to get Ether in metamask account?

I am using Metamask for testing my contract which requires some ether, but, I don't have any ether in those accounts. I know Remix which provides four accounts with 100 eth. I have no idea how to get ...
3
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1answer
423 views

Does quorum support privacy between accounts when multiple accounts use same quorum-node?

From what I understand by this wiki on Transaction processing, quorum-nodes which are privy to a private Tx, will update their private stateDbs. My question is, can two different accounts access ...
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0answers
293 views

How can I create public-private key for a ERC20 wallet that using user's email address?

I am working on a side project that provides a wallet (Think Coinbase, Binance, etc) like interface to users where they will sign in using username and password. To be able to provide a clearer ...
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0answers
42 views

Cannot see address on geth instance console in the dev network

I am trying to develop a ethereum private network & i am using a single dev node. I startup my local dev instance of geth using this command below. geth --mine --dev --rpc --rpccorsdomain="...
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1answer
36 views

Keys and addresses terminology [duplicate]

I am trying to understand the difference between these terms : Wallet private key address in the ethereum ecosystem, and who contains ( sort of one to many or one to one relationships between ...
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1answer
26 views

Is this 'good enough' randomness?

Say I wanted to create a system on the Ethereum network to place bets on a prize pool that was under the current block reward say 2.5 ETH. Would these steps be a reasonably fair way to make sure ...
0
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1answer
363 views

Having trouble with Geth Node 1.8.2

I have been having issues since the geth update. Mist first gave me the error that I should install the newest update manually, and when I downloaded it and tried to install it, I was unsuccessful. I ...
1
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1answer
303 views

How to use hardened key derivation properly?

I am implementing a wallet for customers' deposits account. I am using ethereumjs-wallet/hdkey. I need to decide which derivation path to use: standard for ethereum would be m/44'/60'/0'/0 but maybe ...
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1answer
4k views

How to fix checksum mismatch in downloaded node for Ethereum Wallet?

I attempted to update Ethereum Wallet to 1.8.2 and was given an error: Checksum mismatch in downloaded node! MD5: 308... Please install the geth node version 1.8.2 manually So I went to https://...
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1answer
46 views

What are the conditions in a smart contract of an ICO [closed]

my question may be wrong, hope people understand i basically want to know what do people mean by "smart contracts" for ICO
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1answer
51 views

Ethereum wallet does not allow transaction even after proper conditions

Ethereum Wallet shows "It seems this transaction will fail ......" even though I've used if/else inside contracts to ensure that transfer value does not go higher than contract balance.` function ...
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2answers
52 views

Compile errror in remix doesn't make the thing clear

Doing lesson 5 from here how to write smart-contract, lesson 5 I got compile error in remix. It goes: browser/ballot.sol:40:2: ParserError: Expected pragma, import directive or contract/...
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3answers
697 views

How to access ethereum smart contract(already deployed) in a Java application via its address using web3j?

I have an existing Smart contract address,abi,binary code. I need to access it from a Java application.Is it possible to do this without creating a java wrapper class?
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1answer
82 views

How add payment method to a private blockchain [closed]

I have a question about private blokchain: I like to develop an Dapp in my own private blockchain. but i like to add payment method : i means, how users account pay (with stripe,..) and load his ...
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2answers
138 views

What is insecure about generating a random number with keccak256?

Just read that generating random a random number via keccak256 is insecure. What is insecure about it and what are the implications of insecurity?
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1answer
57 views

Could not transfer ether to smart contract

I'm testing one smart contract and need to send some ether to it, but when I try to do it I get error "It seems this transaction will fail. If you submit it, it may consume all the gas you provide". ...
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1answer
127 views

Switch between nodes/peers in Mist wallet

I'm new to ethereum and i'm facing this issue. I've created multiple nodes and add them as peers using geth console and can make transactions and stuff from there only. But on installing mist wallet ...
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2answers
321 views

Convert ethereum tokens to inr

I have created an account in metamask and have got some ether tokens. Now I would like to convert them into INR so that I get hard cash. Please let me know the procedure to do it.