Questions tagged [dapps]

Questions about applications and projects on Ethereum: a decentralized application (dapp) does not require any servers or backends and runs independent on a distributed blockchain.

Filter by
Sorted by
Tagged with
3
votes
0answers
382 views

What's the correct definition of Decentralized Applications? [duplicate]

What's the correct definition of Decentralized Applications? Some, like https://dappsforbeginners.wordpress.com/tutorials/your-first-dapp points the two layer architecture (web/front layer and the ...
3
votes
0answers
541 views

Pyethapp Build error: No files/directories in ..pip-build-gpzcs1\leveldb\pip-egg-info (fr om PKG-INFO)

I'm new to ethereum & do not have any ethereum clients 'installed'. I'm trying to install pyethapp in a clean virtualenv following the github tutorial, but it produces the following error. ...
3
votes
0answers
158 views

How to encrypt messages to an account owner with the Ethereum public key? [duplicate]

As I understand it, an Ethereum account is a public/private key pair. Is it possible to encrypt a message with the public key (how?) that only the account holder can decrypt it with his private key? ...
2
votes
3answers
2k views

List of successfully running smart contract applications that solve a real world problem?

I'm still diving into smart contracts and learning the way it works, but what are some successfully running smart contracts applications that solve a real world problem? Is there a list of these ...
2
votes
1answer
664 views

How to prefill fields on myetherwallet with given receiver address, amount, and gas limit?

Assuming I have a DApp that relies on people having some injected Web3 available such as MetaMask. If I detect that they do not have Web3, how can I forward them to myetherwallet offline transactions ...
2
votes
2answers
583 views

Any best architecture to develop DAPP application?

I have tried developing Dapps using ethereum blockchain network. If we are going to have the Blockchain as our truth value of our app. Whether all the data related to app will be stored and retrieved ...
2
votes
2answers
288 views

Is it possible to access Ethereum API via the browser?

How do you access the api's of ethereum via the browser? Say I wanted to make a one page app that updates every 1 minute with the block number. And where can I get a list of all the API variables?
2
votes
2answers
509 views

How to create a multiple contract with multiple instance

I would like to know how to create (via another contract or something else) several instances of the same contract with different parameters. For example create several different ERC20 on demand with ...
2
votes
1answer
98 views

ERC 20 or ERC 721 for my dapp?

I am currently making a game where you collect gear pieces and upgrade them. There will not be a 1-1 upgrade, but rather 3-1, meaning 3 items may or may not upgrade to 1. I am aware of the difference ...
2
votes
2answers
340 views

Metamask now longer interacts with PetShop Dapp

Since November the 4th - In order for MetaMask to interact with your webpage dapps, you need to implement the windows.ethereum.enable as part of your scripts I have run through the pet shop tutorial -...
2
votes
1answer
441 views

How to access metamask accounts when using Infura Websockets

I am making a dApp where in for login purpose I access metamask account to which user is logged in. I also have a back end server that listens to events emitted by the smart contract that updates data ...
2
votes
1answer
883 views

Smart Contract vs. Dapp?

Can we say following proposition is correct? "every Smart Contract is a Dapp, but a Dapp may not be a Smart Contract."
2
votes
3answers
264 views

Suggest me tutorial for Dapps and solidity programming [closed]

I am new to learning solidity programming and dpps development. Please share the fine tutorial for both. Hope get the fine answers...
2
votes
2answers
856 views

Getting data from contract to the DApp without provider

I have a DApp that uses metamask or mist as a provider. The DApp can read some info from the contract and show it on page using mist or metamask. Is it possible to read contract and show information ...
2
votes
2answers
2k views

Remix IDE getting VM error invalid opcode

I am attempting to deploy a test contract on javascriptVM using Remix IDE in chrome. However when I try to execute the contract I receive this message in the status section. "transact to Notes....
2
votes
2answers
326 views

Is web3 completely decentralized?

I think web3 is not completely decentralized or safe to use. Consider the following example: I have made a voting Dapp on Ethereum. Now my smart contract will be on the Ethereum blockchain and my ...
2
votes
1answer
55 views

How is a contract settled when multiple wallets make the same transaction?

I'll use the DApp, CryptoKitties as an example: Let's say some sweet digital cat is released with a "buy now" button for 1 Ethereum and 3 people make the transaction via MetaMask. All 3 transactions ...
2
votes
2answers
620 views

how to create a dapp in go?

I understand the process of development of dapp in javascript. Web3 api is used in order to access deployed contracts and truffle can be used for deployment. I want to create an api using Go language ...
2
votes
1answer
408 views

Is there a way to get contract address from dapp name?

I have been looking at already built and in progress dapps and some of ones that have been built have their contracts addresses listed that then can be used to check the earnings on etherscan.io Most ...
2
votes
1answer
616 views

Are there any alternatives for Meteor JS to build DApps?

Do you have to use Meteor for building Dapps? Are there any alternatives for Meteor JS to build DApps? Is it maybe even possible to build distributed applications for Ethereum without utilizing ...
2
votes
1answer
350 views

sendTransaction from iPhone app

How do I call sendTransaction from within an iPhone app? I was thinking of running a web to Geth proxy where the iPhone app would call the Api exposed by the proxy which in turn calls my self hosted ...
2
votes
1answer
250 views

how to build Dapp for Android using react-native

I have a ethereum Dapp for web application and have metamask extension installed in my chrome browser to make transactions. Now i want the same application to be developed in android using react-...
2
votes
2answers
698 views

Empty value (0x) returned from contract web3j

I'm trying to deploy a very simple contract on Windows 10, using Web3j 4.2.0. I've created an account using Mist. I've set up one local ethereum node (using geth) on my machine and I'm able to deploy ...
2
votes
1answer
87 views

Truffle's npm run build doesn't give me any .html and .js files in /build directory [closed]

I successfully deployed my contract with the truffle console. Then I wrote my DApp with the files index.html and app.js in the /app folder. I attempted to build my codes for production by running the ...
2
votes
2answers
178 views

Is ERC721 an appropriate standard for managing licenses?

In my example scenario, I have an e-commerce dApp where e-books are sold. I originally thought that I could represent licenses to access these books using non-fungible tokens (NFTs) through the ERC721 ...
2
votes
1answer
347 views

Is it possible to check a token transaction history for an account with web3js?

If I have an account that has sent and received specific tokens, say ExampleToken (EXT), can I use web3js to see a list of EXT transfers and receipts for my address (or any other address)? I am ...
2
votes
3answers
2k views

MetaMask verification on a server with web3.personal.sign

How to verify MetaMask account holder is the real owner of the address? I recently saw this post and tried it immediately, unfortunately, I am not getting the right result from the server. I think it ...
2
votes
1answer
861 views

Developing native dapps with Go

so I was looking around for a decent up-to-date tutorial to start developing native dapps (C++ or GO doesn't really matter), but I can't seem to find a concise tutorial rather than this one. Can ...
2
votes
2answers
1k views

How to receive ether in wallet address and forward to another address on successful deposit?

I want to implement a feature in which users will send ether to wallet address(0x123) and on successful deposit, it needs to automatically transfer to my cold wallet(0x983). I can able to achieve ...
2
votes
1answer
50 views

Duplicating data on server and contract

If I'm building a dapp, is it worthwhile to store information that is in the contract on a server for speed purposes, and only using the contract to track ownership of tokens. I.e. for something ...
2
votes
1answer
44 views

Thoughts on copying state over multiple contract generations?

I recently published a toy dapp (http://etherdate.co/) to the mainnet with a webapp and after deployment found some breaking bugs that necessitate deploying an updated version of the contract. I ...
2
votes
1answer
28 views

eth.balance() shows random alphanumeric content

const HttpProvider = require('ethjs-provider-http'); const Eth = require('ethjs-query'); const eth = new Eth(new HttpProvider('https://rinkeby.infura.io/')); eth.getBalance("...
2
votes
3answers
779 views

What is the best way for my Dapp users to not pay gas fees?

I'm building a React/NodeJS Dapp for people who just have an email address and nothing more (no Ethereum address (and so no gas), no MetaMask, no Eth Wallets, etc..) An address is created during the ...
2
votes
3answers
928 views

Reasons to develop DApp when you have to pay for executing logic

I am relatively new to the blockchain technology. I understood that DApps have some advantage over regular web apps such as no payment services as paypal are needed, no login is required etc. However,...
2
votes
1answer
506 views

Issue trying to retrieve data from contract using Web3 1.0

I feel like I must be missing something trivial here. I have a smart contract that populates an array of structs shown below. When trying to call addNewQuestion('0x12345') or getQuestionListSize() it ...
2
votes
1answer
586 views

Security - Locking/Unlocking geth wallet

If you're running geth on localhost and use a web page I provided to interact with the ethereum network, is it not possible for me to just unlock the account and transfer the funds to a different ...
2
votes
1answer
101 views

Are events only useful for real-time listening by dapps?

Why would I need to use events when I can access a contract's variables through the automatic accessor functions? Please explain the use of and/or need for events.
2
votes
1answer
453 views

How to hide a function of all but visible to the owner

How to hide a function of all but visible to the owner. For example there is a function: function freezeAccount(address target, bool freeze) How to hide it from others.
2
votes
1answer
35 views

What you mean by Off-Chain in Ethereum Blockchain? can i use geth as off-chain in DApp?

I have read several articles of off-chain definition and come to know that they are use for scale the ethereum blockchain. but my question is what is actually mean by off-chain word in ethereum ...
2
votes
1answer
167 views

Oraclize ( provable) updates the value only one time

I'm trying to write a smart contract that gives me the current timestamp. The very important part is that i want this to happen locally, not on test networks. After some research, i installed ethereum-...
2
votes
3answers
2k 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 ...
2
votes
1answer
32 views

How can I create Ethereum wallet addresses that can be revoked after certain time? Is it possible to do that?

How can I create Ethereum wallet addresses that can be revoked after certain time? Is it possible to do that? I am trying to create temporary wallets for employees in a company for their company ...
2
votes
2answers
54 views

Geographic location in Solidity

Does solidity have a way of fetching a persons geographic location(using something like msg.sender)? Im building a dApp for national elections, and would need to verify the geographic location before ...
2
votes
1answer
611 views

How do you set an icon for Metamask “DApp Connect” popup prompt?

For example, here, how would someone get a logo to appear instead of the default "A" logo?
2
votes
1answer
78 views

Oraclize a restfullAPI using a specific number represented by the variable z

Hello I made a restfull API on my own (python file jsonify + localtunnel) on a localhost using a specific number (in this case 141) represented by the variable z. This variable should go into DevCoin ...
2
votes
1answer
286 views

TruffleContract At() function with Drizzle

I am learning the Drizzle framework after I did a project using TruffleContract abstractions in Javascript (DApp). I have multiple instances of a contract and I am not able to access at the instances ...
2
votes
1answer
347 views

How to connect Quorum with Metamask?

I'm trying to deploy smart contract on Private blockchain(quorum). And run the dapp on private blockchain. But I'm unable to connect the metamask with quorum network. The quorum is currently running ...
2
votes
2answers
68 views

using Ethereum without any gas or coins usage for transactions

I am new to Ethereum. We are planning to use Ethereum for building an application where-in we don't want the users to buy and use Ether's. We want the user's to safely store and retrieve / share the ...
2
votes
1answer
183 views

Solidity cross programming language method calling

I was wondering if it is possible for solidity to call functions of other languages. More specifically, I am planning on developing a basic distributed search engine using the ethereum blockchain and ...
2
votes
2answers
71 views

Will Ethereum be able to support apps like Whatsapp?

Two sources: If Cryptokitties could take so much computing power in Ethereum network, how can the network support dapps with scale?, and; ONO White Paper: Chapter 3 Technical Framework In the first ...

1 2 3
4
5
15