Questions tagged [ethereum-wallet-dapp]

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

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26 views

Ethereum Signing using HSM

I tried signing a Message using the SHA256withECDSA algorithm . It gives a different signed(r,s) output everytime. When i try to recover the address using the ecrevover method .it gives me a different ...
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1answer
26 views

Ethereum stores its own data, how to synchronize the data to other nodes in the future

I use smart contracts in Ethereum to store some string data, how to synchronize these stored string data to other nodes. As far as I know, these string data are stored in the node's leveldb database, ...
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1answer
341 views

How can I change the 12 word phrase in my trust wallet?

I created a ETH trust wallet on my phone for someone and he has now imported the trust wallet to his phone. Is there any way to change the 12 word phrase or somehow give the sole control to the ...
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1answer
30 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 ...
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1answer
32 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 ...
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1answer
46 views

DApp examples containing complete source code

can someone provide me some high quality ethereum dapp codebase examples? This should comprise of not only the smart contract codebase but also the app codebase , complete with the front end UI (...
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0answers
12 views

What is a good wallet service for iOS applications

I am building an iOS app that rewards users with crypto tokens, just like Brave's BAT or Reddit's community points. I am trying to find a wallet service that I can integrate with my iOS app for users ...
0
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1answer
252 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 ...
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1answer
21 views

Add a new user using smart contract

I am trying to make a smart contract which can add /delete and modify users in the smart contract. I have just written the code for adding the user but I am getting an error saying "revert The ...
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1answer
298 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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4answers
1k 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
401 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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1answer
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I got this error during truffle testing. AssertionError: it returns true: expected { Object (tx, receipt, …) } to equal true

DappToken.sol function transfer(address _to, uint256 _value) public returns (bool success){ require(balanceOf[msg.sender] >= _value); balanceOf[msg.sender] -= _value; balanceOf[...
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2answers
468 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 ...
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1answer
91 views

How to decode InputValue of ethereum using java web3j

**I'm trying to decode the inputValue of an transaction using web3j without using any contract abi and wrapper class,Im loading the contract using its contract address ,is there any way/inbuilt ...
3
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1answer
762 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 ...
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0answers
11 views

vyper no mappings allowed when adding a function to initialize a struct that has a map inside

Version Information vyper Version (output of vyper --version): 0.1.0b17+commit.eaa6754 OS: Debian GNU/Linux 10 (buster) Python Version - 3.6.2 Environment (output of pip freeze): asttokens==2.0.3 ...
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0answers
11 views

Does creating account with geth command “geth account new” make a new key store holder?

There are multiple ways of creating a ethereum account through geth. geth account new newAcc, _ := am.NewAccount("Creation password"); by importing import "github.com/ethereum/go-ethereum/accounts" ...
3
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3answers
717 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 ...
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2answers
42 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 ...
2
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1answer
128 views

Refresh page upon MetaMask Confirmation. Web3js & React()

I would like to reload the React Web3 wallet's page upon MetaMask Confirmation. Meaning when the ERC-20 token send transaction is confirmed, the page should reload or state should update to display ...
0
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1answer
99 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
410 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 ...
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2answers
104 views

miner.start() cannot deploy my contract

My environment: geth 1.8.11 Ethereum Wallet Mist Browser Windows 10 I tried to deploy a new contract in the Ethereum Wallet. I executed (miner.start();) in the Geth JavaScript console to get some ...
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2answers
33 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/...
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2answers
52 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 ?
0
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2answers
538 views

Truffle Develop Could not find suitable configuration file

Basically, after I installed the truffle the command: nom truffle -g . Then I went to set up the metamask on the google chrome. Once the metamask is set up then I try the command: truffle develop and ...
2
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1answer
42 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 ...
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; ...
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1answer
85 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 ...
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0answers
9 views

How can I recover STO tokens transferred to a private wallet? [duplicate]

I have the full Ox number and transaction code.. Beginner at all this - any help or insights very gratefully received. As and when retrieved, 20% finders fee offered..thanks, Nick
0
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0answers
25 views

Address generate with xpub key

Hy everyone, I'm doing a hd wallet generator (normal child) with only use xpub key. Therefore, can someone help me pls. With library of golang or main flow of generating from: (xpub key, index) -> ...
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2answers
471 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
25 views

I am having trouble transferring my coin from coin-base wallet to coin-base pro

Hello guys i am trying to transfer my coin from coin-base wallet to coin-base pro. it shows me a message " you are trying to send an erc20 token which are issued on the Ethereum blockchain. This mean ...
0
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1answer
608 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, ...
1
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1answer
24 views

How do I develope a QR code for a 64 character hex string generated ethereum address?

I am learning about how the 64 character hex string generated Eth Address is formed. Is there a program for this?
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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
134 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 ...
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
43 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 ...
1
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1answer
41 views

Why Ethereum based Dapps don't use WebAuthn

According to EOSIO they are able to use WebAuthn: Support for WebAuthn, a W3C web authentication protocol WebAuthn is a standard for strong user authentication collaborated on by the World Wide ...
0
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1answer
61 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) ...
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1answer
65 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
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1answer
167 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 ...
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2answers
3k 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 ...
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2answers
32 views

List Ethereum transactions to: and from: in one const

I would like to list all the transactions to and from my ERC-20 Ethereum address, i can only seem to list to or from, but not both at the same time. Is there another filter I could use or way to re-...
0
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1answer
19 views

List all transactions to: and from: this.state.account in chronological order web3js

I'd like my Web3 wallet to list all transactions to: and from: this.state.account in chronological order, currently I am getting a split of transactions, from: listed first and then to: listed second, ...
0
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1answer
23 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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1answer
33 views

Transactions Stuck. Offline transaction cancelling is not working either

Transaction is stuck pending, so I used Myetherwallet to generate an offline transaction with the same nonce as the pending transaction, YET once the transaction is posted, I see that the nonce ...
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2answers
51 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 ...

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