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Questions tagged [ethereum-wallet-dapp]

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

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1answer
139 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
263 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 ...
1
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1answer
125 views

Interacting with trade/order function which require sha3 hash

I'm currently building a dapp that use both of theses functions : function order(address tokenGet, uint amountGet, address tokenGive, uint amountGive, uint expires, uint nonce) { bytes32 hash = ...
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0answers
16 views

Can we connect custom Ethereum currency through java's web3j library ? If yes then how?

Im trying to create my own new currency using solidity and ethereum platform and also i want to create an Ewallet of my currency using java so that my ewallet could communicate through api .If u ...
1
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1answer
153 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 ...
2
votes
1answer
318 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 ...
0
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1answer
132 views

Is it possible for a ERC20 token to be associated with an application account after the fact?

Say you want to create a new utility token offering, and owning that token will be useful in an application still in development. You don't want to dissuade people from purchasing by requiring a lot ...
5
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4answers
522 views

Can Ethereum DApps work without downloading all blocks in the network?

I've just downloaded Mist (the Ethereum wallet) and am waiting for all blocks to download. I'm on the test network and its been 24 hours with only 50% of the blocks downloaded. My question is, if one ...
0
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1answer
104 views

Why I am unable to write to contract in ethereum wallet?

I clicked on the watch contract and entered address and ABI. But I can't see any functions to write to contract. I compiled and deployed contract by using truffle framework ABI: { "...
1
vote
1answer
158 views

Transfer ETH from wallet into two different accounts(sites)

Could I have one wallet that can be used for two different cryptocurrency sites? For example: If I transfer ETH into my wallet form one site, could I used my ETH in my wallet to deposit the ETH into ...
1
vote
1answer
419 views

Unusual error with bytes calldata

pragma solidity >=0.4.22 <0.6.0; interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes calldata _extraData) external; } contract ...
0
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1answer
437 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
vote
1answer
262 views

NodeJS with HDWalletProvider

I want to execute signed Ethereum transactions from a NodeJS program. I am creating a web3_provider like this var contract = require("truffle-contract"); var provider = new HDWalletProvider("nemonic"...
0
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1answer
269 views

Use injected metamask inside of an ionic app

Ive seen this topic mentioned on the ethers of stack exchange before and mostly these questions go unanswered but being that ionic is basically a fancy webview I am wondering if anyone has managed to ...
0
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1answer
218 views

Ledger nano s unrecoverable - have ethereum private keys - How do I get this ETH?

Lost the 24 word recovery sheet, and the pin number... I"ve resolved that the BTC is gone, but if I opened in myetherwallet - and produced private key and UPC code - I'm told I could get the ETH ...
0
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1answer
128 views

Mist Wallet Synch Stuck - Not coder/geek

I too have the 'synch stuck' syndrome suffered by many others. I don't think I've ever been this frustrated but am trying to be patient. After 12-24 hours I get stuck around 2.4m block after multiple ...
0
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1answer
181 views

How to start GETH console?

I'm getting the following: ➜ voting_truffle geth console WARN [11-29|22:53:43] No etherbase set and no accounts found as default Fatal: Error starting protocol stack: datadir already used by another ...
0
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1answer
176 views

Metamask stuck at Unknown network ID

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 ...
0
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0answers
24 views

How to build an ethereum based wallet with custom UI?

I have been interested in ethereum for quite some time now and have always wanted to learn ethereum development. I decided to create my custom erc20 tokens i was able to create 2,00,000 tokens. Now i ...
0
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1answer
195 views

input decimal type parameter for contract in ethereum wallet

Is there any way to make ethereum wallet can input decimal type parameter for contract at "WRITE TO CONTRACT". For example, "sellToken" function, I want user can sell 1.23 tokens. I have see the ...
0
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1answer
55 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 ...
2
votes
1answer
345 views

How to connect my private ethereum network to ethereum android app?

I want to access my smart contract through a mobile app, which is on my private network. There is ethereum android app, can I connect that app to my ethereum network or if there any other app through ...
0
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0answers
33 views

Sign Message using passphrase only

I'm creating an authentication system using python and web3.py. I'm trying to authenticate a user using from web3.auto import w3 msg = 'sdb41554xcb4xc548cxd84dxcb' message = encode_defunct(text=...
0
votes
1answer
268 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 ...
0
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2answers
395 views

geth attach issue between mac and windows

I am running geth on windows machine and try for geth attach in mac. I give below error: Fatal: Failed to start the JavaScript console: api modules: Post http://192.168.0.107:8545: context deadline ...
0
votes
1answer
23 views

How DApp actually talks to Ganache ethereum node?

Both Metamask and web3.js seems to be enabling a DApp communicates to a remote ethereum node. There are a few different aspects to developing blockchain applications with Ethereum: Smart ...
0
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0answers
18 views

What Android App has block explorer functionality for Ethereum testnet?

I need to interact with my web app that has blockchain functionality and it creates wallets on paper (pls dont ask why). It's using ropsten testnet. Is there an Android app that I can easily scan the ...
0
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2answers
29 views

Stuck in Contract or something similar

Hey guys i almost sent ethereum to a scam address luckily it got rejected cause i didnt use enough gas. this is the ethersacan transaction https://etherscan.io/tx/...
0
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1answer
22 views

Error While Compiling In Remix During Tutorial

During a tutorial on my first compile I received this error: :1:1: Parser error: Expected import directive or contract definition. pragma solidity ^0.5.12; ^ What's that about? How do I fix it? I'...
0
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2answers
47 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 ?
3
votes
2answers
1k views

Call deployed smart contract from web3.js

I have small test smart contract, which is deployed to my test network. And I want to use a server to call the function in the contract. Here is the code: payontime.sol pragma solidity ^0.4.0; ...
3
votes
1answer
657 views

ERC223 Token Fallback Function Usage

I'm currently writing the "Trade" smart contract which is similar to "Crowdsale" smart contract. The only function that I want to add is "sell" function. In general Crowdsale smart contract is used ...
0
votes
1answer
68 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
1answer
281 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(...
1
vote
2answers
32 views

How to find out the number of Validators of a transaction if i have its transaction hash

I want to find out how many validators have validated my transaction.My transaction has is 0x051430dc5cd84c44954e43b25f8709c9c1a1c634f384ec6dd7610f6f945732e1 can anyone tell me how many validators ...
0
votes
1answer
384 views

ABI for Etherscan verification

How I can get ABI in multiple contract code? if the code is here: Token address is: 0x4960a0Db832c3Bb503F3Da59a274D9385e0Ade5A Crowdsale contract: 0x7a76d1A86a8b801865eC9134552904366b327A45 I ...
1
vote
3answers
887 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?
0
votes
2answers
366 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.
0
votes
1answer
23 views

Smart Contract Deployment issue

I am making a smart contract with a Transfer function. function transfer(address _to, uint256 _value) public returns(bool success) { //checking whether sender has enough number of tokens ...
2
votes
1answer
33 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
4answers
1k views

How do I make a smart contract on MyEtherWallet?

I've tried downloading the Ethereum wallet but it's taken weeks to download blocks. The only other option is MyEtherWallet. I asked on Reddit someone said theirs a way to do it with MyEtherWallet and ...
0
votes
1answer
558 views

Error in Ethereum Wallet:“Couldn't estimate gas, resorting to default parameters. Transaction is likely cheaper than the estimate”

I am using ethereum wallet for deploying contracts in my private blockchain. But whenever I try to send a transaction in my ethereum wallet it shows an error that says, "Couldn't estimate gas, ...
6
votes
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.
0
votes
1answer
45 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. ...
1
vote
2answers
2k views

Ethereum wallet is stuck at “looking for peers”

I'm trying to create a private network or test network to work with smart contracts. But when I start ethereum wallet it is always getting stuck at "Looking for peers....". Below is the screenshot for ...
0
votes
1answer
89 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
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1answer
27 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 ...
0
votes
2answers
48 views

Private Ethereum Platform development with Authentication System

I have to develop a system for Univeristy which provides digital certificates. I know some approaches but stuck about which approach I should choose. The system will have (suppose 5 nodes + 1 super ...
0
votes
2answers
35 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 ...
2
votes
1answer
101 views

Which version of web3 shall i be using now?

I found the documentation of version 1.0.0 which was released on the 6th of August here. I was told that v1 is not stable and very different than earlier versions. But when i check the available ...