Questions tagged [metamask]

Question about the Metamask chrome's plugin.

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Developing a dapp using Truffle. Metamask will sometime throw this error when interacting with a simple contract

Trying to setup my development environment to start a personal dapp project. I am starting off the project with the React truffle box. 1) I start by running truffle develop which launches a local ...
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83 views

send().catch() doesn't give me the error message anymore

I'm using Truffle/Drizzle/MetaMask and calling methods with send() and using .then() and .catch() and I rely on getting the error message send to .catch() e.g. contract.methods['hello'](arg).send({ ...
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1answer
94 views

ecrecover in c++

can anyone spot what I am doing wrong? I am trying to recover the public address from data signed by web3.personal.sign in Metamask and with this code the public address comes out wrong. Hash and hex/...
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110 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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1answer
158 views

Web3-core-helpers error: Uncaught (in promise) Error: Provided address “undefined” is invalid,

When I launch the app with with react.. this error occur when my exchange contract is loaded.. Here is the code i wrote to talk to the blockchain: export const loadBalances = async (dispatch, web3, ...
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1answer
29 views

MetaMask listed as “web wallet” on official Ethereum website

MetaMask is listed only in the "web wallets" section of the official Ethereum wallet guide. Obviously, MetaMask is written in Javascript and runs in a web browser. But this is also true of the ...
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2answers
994 views

MetaMask - RPC Error: Internal JSON-RPC error

I am getting this error when i trying to use metamask on my local for a simple transaction from one account(say A) to another (say B). code: -32603 data: {originalError: {…}} message: "Internal ...
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1answer
22 views

Forks of Metamask

Are there forks of metamask to be used to end-users in a permissioned network? In other words, I would like to: - hide public networks (to avoid confusion) - pre-configure that the user should use the ...
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1answer
23 views

View sendTransaction implementation

I'd like to see code that implements getAccounts and sendTransaction in a provider. I tried digging into the Metamask source code and found the line where Metamask supplies the Web3 provider, but I ...
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1answer
161 views

How do I deposit an Ether amount to the smart contract function, namely deposit ? (Metamask version 0.20.7)

I have a problem with using the deposit () function on a smart contract. How do you use metamask 0.20.7 ? const contractInstance = web3.eth.contract(contractAbi).at(contractAddress); contractInstance....
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811 views

Issue with Ganche and Truffle with Metamask. Can't load token balance

I'm testing to create a token in Truffle; it compiles fine, but it won't load the balance of the token in to Metamask. I've set the connection correct: it does load the ETH balances of the Ganache ...
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119 views

Getting Metamask Error Message into web3.js DApp after user rejects transaction

I'm building a simple HTML/JavaScript front-end to interact with a Smart Contract using web3.js and MetaMask. I have a function to call one of the methods in order to send a contribution to the Smart ...
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35 views

web3 update monitoring

Inside a DAPP, I have been using web3.currentProvider.publicConfigStore.on('update',... to monitoring Metamask activity. But in the new metamask-mobile such method does not exists. There is a ...
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107 views

How to connect to MetaMask via web3js

I'm trying to recreate this site TenThousandSu And this is the smart contract I'm trying to call https://rinkeby.etherscan.io/address/0x7e338acfb7a5d7e99f4225cc12dc884f49c00f6a#code I'm using "1.0....
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1answer
73 views

Gas estimation errored using ERC20 in REMIX

I'm trying to test making some smart-contract that uses DAI ERC20 tokens on Kovan testnet (DAI contract on kovan is 0xc4375b7de8af5a38a93548eb8453a498222c4ff2). I developed this very simple contract ...
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Is Metamask (and other tools like it) a threat to decentralization? [closed]

The concept of cryptocurrencies were to remove trust but tools like metamask require you to trust them with your front end.
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1answer
150 views

MetaMask blocks Web3 requests

I just set up a Block Explorer to interact with my private blockchain. The private Blockchain runs in a VM. The host system connects to the Block explorer (also on VM). When I have meta mask ...
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Payable function not working properly

Hi everyone hope I will be clear enough with the explanation because I couldn't find a proper solution. I am just trying to checkout an item with my buy function but it seems like I am stuck.Here is ...
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2answers
59 views

Why can't I use a contract method in my Chrome console?

I am attempting to call a method from a smart contract from my chrome console. My dApps index.html file is deployed locally at http://127.0.0.1:5500. I set up web3 and instantiate a smart contract ...
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1answer
48 views

How can I reduce the gas price for the fallback function?

Below is my fallback function for ethereum. It currently require 91000 gaslimit which is way more than 21000. Metamask always starts the transaction with 21000 gas stipend due to which transaction ...
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1answer
55 views

Where is web3.eth.abi with the version of web3.js given with Metamask

Seems the docs doesn’t contain the answer. Looks like that part was moved elsewhere with latest transaction. The aim is to access encodeFunctionSignature() for knowing to which function name the ...
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47 views

Transactions go to an older contract address rather than the present deployed one

Though I have deployed a new contract but the transactions go to a previously deployed contract in my application. I'm attaching the screenshot of my Remix-ide code and the code for the front end ...
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133 views

Ether.js - Sending transaction with metamask

Problem: Cannot send transaction to contract with metamask when using Ether.js I can get a result when calling a public view function as shown below. However, when calling a normal function, ...
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1answer
380 views

problem connecting web3 v 1.2.1 with metamask : 'currentProvider' of undefined

I am using Web3 v1.2.1 with nodejs v10 and following this link. I am having issue connecting with metamask,below is my code snippet: const Web3 = require('web3') const window = require('window'); ...
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63 views

Fallback function fails when ethers sent from metamask

This is my code snippet for fallback function, If I use it by explicity using "fallback" function on Remix, then equivalent no of tokens do come in my wallet but if I send ethers via metamask directly ...
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2answers
50 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 ...
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20 views

Unknown account error when initiating transactions from remote node

I am using Ropsten network and trying to transfer ether from my metamask account to my another account using geth client. I am using the methods like eth.signTransaction, eth.sendTransaction in CLI, ...
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1answer
450 views

How do I create a MetaMask Connect request to auth a wallet with MetaMask

I am looking for how to authenticate completely in the browser with MetaMask, presumably by having it sign with some private keys and prove that the user owns a wallet that lists the corresponding ...
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1answer
207 views

signed message different on opera and metamask

I am using the following code to sign a message: web3.currentProvider.sendAsync( { jsonrpc: '2.0', id: 1, method: 'personal_sign', params: [ `My account is ${this.accounts[0]}`...
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1answer
183 views

Metamask connection with private node with rpc

i am trying to connect metamask with private node but its fails to connect geth --rpc --rpcaddr 127.0.0.1 --rpcport 8545 --rpccorsdomain "*" --rpcapi admin,db,eth,debug,miner,net,ssh,tapool,personal,...
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1answer
123 views

Ethereum wallets that support “Custom RPC URL” like Metamask

I'm running a private blockchain and I've been using Metamask connected to my custom RPC URL with no issues.. I'm curious if there's any other Ethereum wallet that let's you add and connect to a ...
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21 views

Can I Create Node.js API for each function in Smart Contract but sign a Transaction from frontend via Metamask.?

I am trying to develop a Dapp with nodejs backend but I cannot get accounts from Metamask which resides on my frontend. I tried to create an endpoint for each function in Smart Contract. And it seems ...
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138 views

Confusion around Truffle, Ganache and Meta Mask

I am building a simple contract. In truffle when I give 'truffle develop' command, I get following information: On the Ganache, I have this: And finally on Meta Mask, I see this: here, Shikhar is ...
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1answer
217 views

Using vanilla javascript with web3 and metamask

I have searched severally on how to use web3 with metamask without nodejs without any success. I want to be able to get an instance of a user's metamask account through web3 and vanilla javascript ...
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25 views

Why Does Metamask Show The Sign Prompt But Have web3.eth.sign Undefined?

I am trying to make the end user sign something. I hosted this on with python simplehttpserver: web3.eth.sign(web3.eth.accounts[0],"asdf" ,function(error, result){ if(!error) console.log(JSON....
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1answer
47 views

Can Dapps set cookies

Is it possible for a Dapp that uses the metamask/chrome to set up a browser cookie? or can a cookie set by another website like facebook, read some information or at least know that a dapp has been ...
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1answer
365 views

'ALERT: Trying to call a function on a non-contract address' Why Do I Keeping This Error?

This is the error from metamask directly: This is the error I get once after I submit the information to IPFS: My Smart Contract: pragma solidity 0.5.3; //Imports for safe math operations import "...
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2answers
280 views

How to get transaction status (programatically, not etherscan)?

I have a problem when I interact with an Smart Contract, from a javascript webapp. I can execute the transaction correctly when the status is confirmed, but I cannot get any error response when it ...
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14 views

Getting error when importing, no error when using code in single file: Failed to execute 'postMessage' on 'Window'

I am trying to access the web3 object injected into my browser by Metamask. I am using custom rpc (). I can see my accounts and correct balances in Metamask. I have the following code: //web3.js ...
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1answer
2k views

html:82 Uncaught ReferenceError: App is not defined at HTMLButtonElement.onclick (html:82)

It's showing me uncaught reference error in my index.html file <div id="candidate-box"></div> <button class="btn btn-primary" onclick="App.vote()">Vote</button> ...
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3answers
247 views

Deploy smart contract on Ropsten with Truffle without truffle-hdwallet-provider

Here is my truffle-config.js networks: { ropsten: { network_id: 3, host: '127.0.0.1', port: 8545, gas: 4000000, from: "address_in_metamask" }, I ran a geth node using the command: geth --...
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1answer
53 views

How do dapps connect to blockchain network?

Once the simple blockchain web applications runs on the web browser it uses the metamask to connect to the blockchain network, when it comes to mobile applications how the application connects to ...
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1answer
277 views

can etherscan.io show local ganache transaction details?

I am purchasing tokens on my sample Dapp with ganache-cli account using metamask. Metamask shows the confirm message and deduct the ether from total balance but in token section it still not update ...
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1answer
44 views

Problem with loading my front end local host due to metamask

I have been trying this Dapp university tutorial online and after following it meticulously I've come across this problem. I suspect it's metamask as the video said if I get this loading message I ...
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241 views

Metamask and ethers.js : how to send arbitrary data with simple transaction?

I want to store data on the Ethereum blockchain (without using a smart contract). I tried to use Metamask to send transactions like this : const parameters = [ { gasLimit: "0x2710", ...
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65 views

which is a better method to use for signing messages between two parties in web3?

I have been searching for a while for the most secure and supported way for off-chain channel messaging.....so i was using web3.eth.sign(address, keccak256(msg)) for singing messages ....but then used ...
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1answer
156 views

How to use window function in controller (node.js)?

So this is my users controller to upload a file : exports.postUploadFile = (req, res, next) => { var ethereumURI = req.body.ethereumURI; var abi = JSON.parse(req.body.abi); var ...
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1answer
68 views

How to replace Metamask Pop-Up with my own UI

I was wondering if I can replace the Metamask pop-up with my own pop-up/user interface. Example: Currently on my dApp a user clicks "Buy Token" and a Metamask modal pops up and says the usual ...
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1answer
213 views

What should gas prices be for sending out tokens?

I constantly get failed transactions when sending out tokens like USDT using metamask. I have my gwei set at 10 and the gas limit at 21000. I even tried gas limit set to 51000 and it still fails. ...
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47 views

How shoud I properly initialize DApp and get account address?

I am writing DApp in react, and basically I want to initialize web3, unlock account, and display it. Having web3 in my package.json In the onload I've tried to go following: let Web3 = require('web3')...

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