Questions tagged [ethereum-wallet-dapp]

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

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1answer
334 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 ...
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0answers
31 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
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1answer
256 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
374 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
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1answer
16 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 ...
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2answers
77 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?
0
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1answer
327 views

Metamask won't display correct balance after creating customrpc for ganache accounts

I made a customrpc network on metamask using the correct server and imported a private key from ganache, which worked but the eth balance is displaying 0 when I expected it to display 100. According ...
0
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0answers
13 views

How to setup clef signer with clef --stdio-ui

I have geth running on rinkeby network and successfully used clef as a signer using command. clef --keystore ~/.ethereum/rinkeby/keystore --chainid 4 --stdio-ui Also started geth with clef as ...
3
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2answers
659 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
16 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
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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
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1answer
623 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
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1answer
65 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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1answer
254 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
30 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
379 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
779 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
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2answers
350 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
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1answer
21 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
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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
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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
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1answer
542 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
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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
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1answer
40 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
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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
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1answer
73 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
26 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
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2answers
38 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
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2answers
31 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 ...
1
vote
1answer
56 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 ...
0
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1answer
42 views

Unable to Generate Address Endpoint Blockcypher

I am trying to generate an address using Blockcyphers Address Endpoint using cUrl. - https://api.blockcypher.com/v1/eth/main/addrs?token=eth But it returns this error - "Endpoint not found. Please ...
0
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1answer
34 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 ...
0
votes
1answer
21 views

Is there any possibility to exclude one of MuliSig Wallet owners?

I mean not to exclude from already existin multi sig wallets, but create a wallet with such possibility. For example: The team of 4 people want to accept temporary 5th member (give him the right ...
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
22 views

Error: Keystore: Must include seedPhrase in createVault inputs. How to fix?

i'm studying blockchain development, and i'm trying to create wallet with seed words using eth-lightwallet and vuejs. But i receive this error: Keystore: Must include seedPhrase in createVault inputs, ...
0
votes
1answer
90 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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2answers
21 views

No longer have tokens after updating Nano S [closed]

I recently updated my Nano S and was required to reset everything. After udpdating I went to MEW to swap my KIN & I had a ETH Ballance of 0.000 & a KIN ballance of 0.000. I have the address ...
0
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1answer
47 views

acess variable from token contract to ico contract , both placed in diffrent files

//token.sol pragma solidity ^0.4.24; /*import "./Ownable.sol"; */ contract ERC20Interface { function totalSupply() public constant returns (uint); function balanceOf(address tokenOwner) ...
1
vote
1answer
23 views

is there any method convert mutiple params to one bytes in web3js ,and then get these original data from bytes in solidity?

eg: the params in js code below,how to convert to one bytes var min=100; var max=100000000000; var price=1000000000000000000000000000; var name="john"; in solidity code below,how to get original ...
0
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1answer
29 views

How to reach my ethereum wallet?

I have a ethereum wallet adress, but I don't know from witch platform. How can I find out were the wallet is from?? So that I can login to my wallet. I sended ngc today. Already mailt naga coins if ...
0
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1answer
15 views

Get a list of tokens inside an ethereum wallet address

is there a way(mostly a api) to get all the tokens currently being held by a wallet address?(Their contract addresses)
0
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1answer
30 views

Ethereum Smart Contract with Custom Fee and Percentage of the collected Fee Distrusted token holder

I wanted to know is there a possibility to create a smart contract for a token wherein the transaction fee could be overridden with the network fee and the fee collected on the transaction can be ...
0
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2answers
63 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
58 views

How to handle exceptions in ethreum private network using revert(),throw

I am running a private ethereum network using geth --rpc --rpccorsdomain "*" --datadir ./chaindata --port "30330" --nodiscover --rpcapi "db,th,net,web3" --networkid 2010 init genesis.json and ...
1
vote
1answer
31 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
1answer
174 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
vote
1answer
229 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 ...