Questions tagged [ethereum-wallet-dapp]

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

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140 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! ...
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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 = ...
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1answer
201 views

How to split funds in single send transaction

Scenario: Alice Account = 2 ETH Admin Account = 0 ETH Bob Account = 0 ETH Alice wants to send 1 ETH to Bob using my application. Application will charge 0.01 ETH as it's commission and will be ...
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44 views

How to create withdraw token requests on my custom token sale dashboard

I created a token sale dashboard. Users can send BTC,LTC,ETH to dashboard. When user send BTC, LTC or ETH to dashboard, they get tokens to their dashboard budget (offchain) based on current token ...
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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 ...
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1answer
20 views

How can i make payment application using the blockchain?

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 ...
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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 ?
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1answer
49 views

Do we have to compile and deploy our contract to ethereum each time we start a test rpc?

I'm trying to develop a voting application, I have successfully compiled the app and also deployed it to ethereum blockchain. Now I've closed the test rpc and node console, and when I restarted node ...
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3answers
57 views

How to do transaction on a dapp without any wallet

I am able to do a transation in my private nework using geth console. But I want to the transaction on a dapp without using any wallet
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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 ...
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3answers
3k views

Ethereum Wallet Start Mining option is disabled

I just downloaded Ethereum wallet and after syncing the blocks when I went to Start mining to get some Ether, the menu button is grayed out, its disabled This is my wallet, in case if you can send me ...
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1answer
60 views

How to customize/modify the default startup url in Mist brwoser for ERC20 tokens on Ethereum?

Hi I am making an ICO wallet. I know Mist browser(https://github.com/ethereum/mist) has a lightweight version coming up soon and ConsenSys(https://github.com/ConsenSys/eth-lightwallet) has one, but I ...
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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 ...
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1answer
21 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
65 views

retrieving tokens from contract

I am using the MyAdvancedToken code from: https://www.ethereum.org/token I transferred tokens from owner account into the contract, to fund any buy(). Now, I want those tokens back. Is there any ...
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1answer
66 views

Which one of methods should I choose for deployment of smart contract geth or a wallet if I have to build API for smart contracts in nodejs?

I'm having trouble to understand which method would be better for deployment geth or a wallet if I'm building API in nodejs using web3. Where exactly is the contract stored?? Is the contract ...
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1answer
69 views

Ethereum unlock account

Is there any way to unlock the ethereum account when using the infura api. Can only metamask do it? I would not like to use metamask because not every user has it on the browser
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1answer
65 views

miner.start() cannot deploy my contract

My environment: geth 1.8.11 Ethereum Wallet Mist Browser windows 10 I try to deploy a new contract in the Ethereum Wallet. I execute (miner.start();) in the Geth JavaScript console to get some ...
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1answer
593 views

How to use mnemonic to recovery my ethereum wallet

I use web3j to create my ethereum wallet.the Code just like down import org.web3j.crypto.Bip39Wallet; import org.web3j.crypto.Credentials; import org.web3j.crypto.ECKeyPair; import org.web3j.crypto....
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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.
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0answers
121 views

There is any open source for mnemonic (recovery) phrase can be used in react project?

I want to know how to implement 12 words or 24 words mnemonic(recovery) phrase screen as "Create Wallet" part in the ethereum, ERC20 token wallet project built with React Native like as coinomi wallet....
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1answer
66 views

How to call a payble function in embark? When I am trying it is showing gas limit exceeds

when I am trying to call payble function in embark it is showing gas limit exceeds. Please tell me where I am wrong? ///////////////// Index.js: $('#buy button').click(function() { ...
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1answer
63 views

What is rpc and p2p code for Ethereum token? What to give as GitHub source code of an Ethereum token in exchange?

I’m new to Ethereum development. From ethereum token docs I came to know the process of deploying the token. But at some exchanges they ask for RPC and P2P port as well as the github source of the ...
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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
259 views

Uncaught Error: CONNECTION ERROR: Couldn't connect to node web3.min.js:1 http://localhost:8545

**Hi, I am doing a sample project on Ethereum where 2 fields ( Emp name, Emp Id) will be taken from the UI and set those values using a smart contract and show the values back to UI. Getting below 2 ...
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1answer
68 views

Add blockcypher testnet to metamask

We use blockcypher in our project.However it is not convinient as it doesn't seem support metamask. Can anyone please suggest if there is a way to add blockcypher testnet to metamask?
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1answer
80 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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1answer
97 views

Does Ethereum wallet cache passwords?

I am using Etherum wallet (this thing: https://imgur.com/a/WGDLs) I created a new account, transferred 0.01 etherum into it. Then I went to accounts -> backup -> accounts, which took me to Users\...
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1answer
669 views

how to set msg.value in metamask?

I am using MetaMask chrome extension, for my Dapp. I have a function which needs to transfer some amount to another account. This amount is of the order 200 to 800 wei. How do I set msg.value() ...
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1answer
156 views

How can we access private blockchain from another network?

I have private Ethereum network running on my local network with two sealer node and one bootnode. I have deployed the private blockchain and configured it using geth. Now I want to create another ...
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1answer
150 views

How to map multiple time and index value on same address

I wish to map the time to the address key. But currently it is working on the index key only. I just want to map time as well. Means the current time. So that I can able to get the record with time as ...
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1answer
116 views

Input byte array must be in range 0 < M <= 32 and length must match type-web3j

I have created an api to addCandidates. But when i run the api i get error: Input byte array must be in range 0 < M <= 32 and length must match type My codesnippet for addCandidates is: @...
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1answer
107 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
85 views

Switched from the Ethereum Wallet's test network to main network and need to remove the previous data

I was on the Ethereum Wallet's test network and finally worked out all the code, but now that I have switched over to the main network I've had to download a lot of the preexisting blocks and has my ...
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1answer
104 views

Problems funding Ethereum Wallet

Tried making three separate transactions from two separate wallets (Coinme and Coinbase) each in relatively small amounts (less than $50) to fund my Ethereum Wallet 8.0 for Mac. None have appeared ...
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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 ...
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1answer
157 views

Infura API for mobile(ionic) app

I have one little question. Suppose I have private key of user in ionic app. Is this enough to make transactions using infura API and web3?
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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 ...
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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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1answer
170 views

How to read previous blocks data?

I'm new to block chain technology. I'm trying to store and read blocks using testRPC along web3.js. I'm able to get the latest block data but not able to fetch previous blocks data. Please some one ...
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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
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 ...
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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 ...
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3answers
104 views

Crowdsale tokens count is not reducing even user gets the tokens to his account

I had created 100 million tokens and created a contract for crowdsale in test network If user sends a 1 ether using contract address i am able to receive 1 ether and send 1000 tokens to user who send ...
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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 ...
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1answer
131 views

Can a mapping or array within struct made public?

contract CrowdFunding { struct Funder { address addr; uint amount; } struct Campaign { address beneficiary; uint fundingGoal; uint numFunders; uint amount; mapping (uint =...
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3answers
249 views

Unlocking Ethereum wallet using Geth JSON-RPC

When I use ETH with JSON-RPC I have error "message": "authentication needed: password or unlock» and If I manually unlock I have other error "message": "insufficient funds for gas * price + value" Any ...
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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 ...
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1answer
136 views

Installing Ganache GUI on windows 8.1

How to install Ganache UI on windows 8.1 ? I downloaded from Official website but after downloading i am unable to install it on my machine. I tried to install it through power shell but facing ...