Questions tagged [ethereum-wallet-dapp]

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

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Getting this message in mist: Couldn't estimate gas, resorting to default parameters. Transaction is likely cheaper than the estimate

What is this error message in red: Couldn't estimate gas, resorting to default parameters. Transaction is likely cheaper than the estimate I have written a smart contract: pragma solidity ^0.4....
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1answer
84 views

Can't use constructor() when deploying a contract from ethereum wallet

Take the following code: pragma solidity 0.4.24; contract TestCoin { mapping(address => uint256) public balanceOf; uint256 public totalSupply; constructor(uint256 initialSupply) ...
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1answer
46 views

Access DApps publicly

I have created my own private blockchain network in LAN.I am using admin.peer() function for adding a new peer to network,for this admin.peer function to work I need an IP address.So my question is ...
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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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1answer
54 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 ...
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1answer
382 views

Look for an address in a common.Address array in Golang

Im essentially looking for a way to use bytes.Compare() but on an array of ethereum addresses that are of type common.Address. I need to search an array to see if another address exists in it and then ...
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1answer
28 views

Issues with transaction signing

I have a desktop app that accepts payment from user in ETH and provides it some service for a certain amount of time depending on the amount. For that the user needs to sign the transaction in the ...
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127 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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2answers
959 views

How execute a contract method with private key / sign send method?

I'd like to execute an erc20 contract method without unlocking a wallet, signing the transaction inside my code. Here is how the code should look like: public async send(sender: string, receiver: ...
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1answer
114 views

Airdrop function executing but balances not updating

I created the following code for token generation and airdrop. The token generation is working. I am able to execute the Drop() function (and got confirmations of contract execution) but the token ...
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1answer
11 views

ETH to Tokens Without Wallet

I wanted to buy tokens with ETH and send directly from my brocker to the token selling company, the transaction failed. is there a way to recover my ETH?
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Test cases required for Multisig wallet

Can you please suggest me some test use cases that are applicable for a smart contract that has a multi-signature wallet in Ethereum?
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1answer
195 views

Transfer data using solidity transfer function

Can we use transfer function in solidity to transfer the data? My code _dest.transfer(txn.value)(txn.data); and it is showing the error that this type is not callable.
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1answer
273 views

Solidity compilation issue : Function overload clash during conversion to external types for arguments

I am new to solidity trying to compile the code which was an old example running good with old compiler. When I tried to compile the same in remix with latest compiler, I am getting the below issue. ...
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1answer
240 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 ...
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How to use bytes to get the same hashed output [duplicate]

I previously asked a question here: link to previous question. Found out the answer is to use string instead of bytes here: pragma solidity ^0.4.18; contract C { bytes32 public temp; ...
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1answer
171 views

Can we write pure native mobile app that on blockchain

I have a web-based blockchain application. On web, I can use metamask for making transaction. On mobile, I can use some Dapp browser such as Toshi ... But I want to write a native application (pure ...
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2answers
277 views

Problem in fetching return values in solidity contract function using web3 js

solidity function: function getCredentials(uint id) public constant returns(string,string,uint) { address ad=acadr[id]; uemail=email[ad]; ulocation=location[ad]; ugid=gid[ad]; ...
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1answer
47 views

Transaction fees in ethereum [duplicate]

I have created an ERC20 token, but whenever I want to trnasfer it, transaction fees is deducted in ethers. But I donot want to but ethers. Cant the fee be deducted in terms of my custom token? Thanks
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4answers
396 views

Can I use ether.js with truffle

I have buid a dapp with web3, truffle and metamask, which works perfectly fine. Now, instead of using a wallet I want to create my own wallet using ether.js, but couldn't figure out a way to use ...
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3answers
89 views

How can we fixed conversion rate of our own ethereum cryptocurrency?

I have created ERC20 based token.I fixed 1 token value equal to 0.01 eth. One question arise in my mind.Is it possible to fixed conversion rate of own Ethereum cryptocurrency ??
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1answer
215 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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2answers
488 views

Creating a new wallet mobile application for newly created crypto currency

I am doing as a Intern in Apogee Tech Global in Bangalore on Blockchain for three months. My commitments is to learn solidity language, build smart contracts, learn Ethereum and Hyperledger. I learnt ...
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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 ...
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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 ...
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2answers
102 views

This contract collects ETH in exchange for voting tokens. What function will allow me to transfer the collected ETH to a wallet?

pragma solidity ^0.4.23; contract Voting { bytes32[] public candidateList; uint public totalTokens; uint public balanceTokens; uint public tokenPrice; // what is the voter ...
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3answers
484 views

Is it possible to send/receive Bitcoin using a smart contract?

My Question goes in the sense of what's possible in terms of creating a Dapp that allows to send/receive BitCoin just like it would any other given ERC20 Token. Is this possible to achieve for a Smart ...
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1answer
252 views

Connect privatenet with ethereum wallet

I created a private net within a folder in Documents. It works fine. I tried connecting ethereum wallet with private net...But ethereum wallet created another node in .ethereum folder and shows ...
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0answers
287 views

Ethereum wallet stuck on loading

I have installed Ethereum Wallet and switch it to the Ropsten Testnet after first start, it synced all blocks. After restart I am trying to run it, but it stuck on loading splash. I am on Windows 7, ...
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1answer
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Do we create a new crypto currency in test networks with mist ethereum wallet?

I am doing as a intern in a company. Here their request is to create a new crypto currency for their company. Upto now I have learnt the solidity also I have gone through how to create new crypto ...
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2answers
218 views

Servers That Implement Ethereum RPC

Here is the documentation for Ethereum RPC. It looks straight forward enough, but I just need a list of servers that implement the RPC. https://ethereumbuilders.gitbooks.io/guide/content/en/...
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1answer
343 views

How to generate deterministic keypairs using ed25519

I am trying to implement my wallet using ed25519 curve, i was using tweetnacl from this link "https://github.com/dchest/tweetnacl-js" its working, But i want to generate deterministic key-pair ...
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0answers
342 views

Ganache Cli private network, all ethers on the network go to 0 after a while

I create a ganache cli and initialize my accounts to have ethers using ganache-cli -h "159.89.119.189" -a 3 -e "1000000000000000000000000000" --secure -u 0 -u 1 -u 2 -s 20 but after a couple of ...
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1answer
608 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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1answer
287 views

Ethereum wallet and private key [duplicate]

how to generate public and private key for each user on my decentralized app? After filling the app on ethereum network?
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1answer
46 views

This contract does not implement all functions and thus cannot be created? I am very new to solidty . Any help highly appreciated

pragma solidity ^0.4.0; contract contracta{ uint mapsize=10; struct request_task{ uint task_id; string ip_address; uint flag ;// submited, 1, excuteding, 2, finished, 3, failed ...
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1answer
1k views

create ether wallet using nodejs

I have implemented the code which is creating new wallet but I am not able to get the private key of that wallet. Can anyone tell me like what is the proper way in which I can create new wallet which ...
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3answers
58 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
74 views

How to create a wallet address (say) for a user sign up with any password of user choice and login next time with the same password?

I want my dapp to allow a new user when submitting a sign up to create an ethereum address with his provided password of his choice and next time when he logs into dapp, he must be able to login with ...
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1answer
188 views

Ropsten account address

When using for example ropsten testnet as a provider like https://ropsten.infura.io/<infura_token> How do I identify the account address of my transactions?
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199 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 ...
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4answers
157 views

Solidity unit verification?

1 Ether = 1000000000000000000. //The ether price in wei I know this price in wei.It is may be in other smallest unit of gas like Kwei, Ada, Femtoether or Finney, Milliether,Milli.So, solidity code ...
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2answers
359 views

Is the Gas Fee refunded if the transaction fails?

I'm confusing the rule of paying gas fee when caller makes a transaction. The gas fee is needed when the transaction is made and I know that the require() is the guard function that returns all the ...
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1answer
1k views

What is a Erc20 (UBT) token I received in my wallet according to EtherScan?

I look in my EtherScan and it says that 5 days ago and 10 in value I received a token called Erc20(UBT) and I click on it, it's a Universal Bonus Token that came from an address = 0x00000000000... ...
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2answers
678 views

how ipfs work in ethereum blockchain [closed]

currently i am learning ipfs and ethereum based blockchain technology,I wanted to know can we store data on ethereum blockchain and yes then how. and also wanted to know how exactly ipfs work for ...
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1answer
66 views

Documenting an DApp components

I am new to building decentralized applications and i am trying to document the process of building an DApp. Waht are the components as well as installations that are needed to build An Dapp ? (if is ...
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3answers
459 views

How can i transfer erc 20 tokens manually in bulk?

Can anyone help me with how to transfer tokens manually in bulk?as i have to transfer tokens to multiple ETH addresses but cannot waste time transferring it one by one.
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1answer
159 views

where impelement web3 services : backend or fronend? [closed]

I am developing a social-media-like application based on ethereum blockchain and some use cases are controlled by smart contracts. so to communicate with smart contract I have to deal with web3. ...
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2answers
470 views

How to call a function of a deployed smart contract in ethereum from another smart contract?

I have a smart contract deployed at a particular address(say, 0xABC). This contract is ERC20 token(say, ABC token) smart contract. This contract was deployed on **Nov 2017.** Now I want to have ...
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1answer
159 views

what is ERC20 ERC20 token = ERC20(_tokenAddress)

How can I call transfer function of a ERC20 token contract from another contract? in this question there is one answer from pabloruiz55 but in this example or demo code ERC20 token = ERC20(...