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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.

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4
votes
1answer
990 views

Deploying Meteor Dapps

What are currently the best architectural and deployment options for building and deploying a Dapp built with Meteor/Web3? For building the Dapp, a few Meteor packages are currently available : "...
4
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1answer
1k views

MIX dapp IDE - how to run your dapp after deployment, error web3 is not defined

I managed to run a personal test chain. I deploy the Sample contract and everything is ok. Transactions included. Now how can I run the dapp? I go to the local package folder inside www I open the ...
4
votes
1answer
282 views

Truffle hangs forever with parity with PoA

I'm trying to create a private chain using parity (PoA) and truffle but when I do truffle migrate it hangs forever with the following output: > [ > { > "jsonrpc": "2.0", &...
4
votes
0answers
110 views

Querystring in Parity Dapp frontend

I'm playing with local Dapp for Parity. When I'm trying to use query string in Dapp, I can't get it with js: I see that iframe is used inside, but have no idea, how to add query string there. Is ...
4
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0answers
364 views

Big Data/IoT projects on Ethereum [closed]

Can you provide names of Big Data or IoT projects (other than Slock.it) currently running on Ethereum? I'm especially interested in how Big Data could use it or whether a combination of IPFS and ...
3
votes
3answers
2k views

How to verify MetaMask account holder is the real owner of the address?

I'm making a dapp that will make calls to a Node.js server. I expect the user to have MetaMask installed and I want to verify that he is the real owner of the current address on MetaMask (i.e. ...
3
votes
1answer
138 views

Can any one pretend as a contract owner?

I am new to ethereum and solidity , i created a Token app using zeppelin and truffle which generates and sends tokens to others. My question is if i deployed the contract then msg.sender is my public ...
3
votes
1answer
410 views

Infinite loop in a view

How is ethereum network protected against infinite loops in views? In normal transaction you have to pay a gass, so it would be too expensive for you, but calls to views are for free. For example ...
3
votes
2answers
788 views

How to reset private blockchain (Parity) and delete contracts?

I have a private blockchain where I'm testing a contract and I want to re-deploy a very-slightly modified version. I need to delete the old one first. I control all of the nodes, so I can do this. ...
3
votes
1answer
450 views

How do I make a Dapp that orders pizza?

So I recently purchased ether.pizza with the intention of setting it up so people can order pizza with ether just to use as an experiment in Dapp and contract development. Initially I plan on just ...
3
votes
2answers
605 views

Possible to store data outside of contracts?

I am trying to wrap my head around a specific scenario: A company wants to leverage Ethereum's blockchain by storing, for example, hashes of documents and storing them on the network. The Idea is ...
3
votes
2answers
282 views

Should we patent Dapps with new technology or processes?

I understand in the decentralized space patenting anything is generally frowned upon. Having said that, doesn't this expose Dapp developers to patent trolls, such as the Bank of America, from ...
3
votes
2answers
1k views

How can I return dynamic string array in Solidity?

How can I return a dynamic string array? I came across serialization and deserialization. How can I serialize and deserialize dynamic string array ? pragma solidity ^0.5.0; contract Abc{ string[]...
3
votes
4answers
598 views

DApps with fiat currency?

Is it possible to build DApp which can accept Fiat currency? Because for an existing business to move to blockchain, the existing users should be able to transition to DApp seamlessly. I would like to ...
3
votes
2answers
518 views

How to run Ethereum functions remotely?

I want to implement a system that users can sign and send transactions (from their Ethereum account, which -for now- I assume exists) with just a GUI, and maybe asking them to enter their address and ...
3
votes
1answer
676 views

About DApp UI Hosting

Is a DApp also hosted like web application. As i know that smart contracts are stored in the blockchain but what happened with the UI part?
3
votes
1answer
277 views

2-phase commit between IPFS and Ethereum

I'm interested in integrating IPFS and Ethereum, i.e. by putting metadata in the blockchain / contract, and underlying assets in IPFS. Has anyone done any work bridging the two? The only way I can ...
3
votes
2answers
377 views

How does a decentralized application interact with the ethereum network?

I want to build a integrated application focusing on only one contract, the deployment and transactions sending, how can such an application communicate with the ethereum network without geth ...
3
votes
1answer
767 views

Nethereum and UWP on .Net c#

Is there a way to make Nethereum work with an UWP app ? Because when I try to download the package with nuget It raise an error. I enter the following command in Nuget Package Manager: Install-...
3
votes
3answers
1k views

Why would I use Metamask instead of only using Web3.js in the browser?

It is my understanding that Metamask brings a convenient way for the user to interact with DApps by storing their wallets and by providing an interface that gives the user control of what the DApp is ...
3
votes
1answer
232 views

Help me to understand the moral implications of the Ethereum blockchain, dapps, and data

Let me preface this with: I'm an Ethereum noob, and the technology is difficult to grasp. My question has a hypothetical scenario along with a few questions. I am having a hard time grasping how ...
3
votes
3answers
4k views

How to Unlock account via web3js without geth(web3-extended doesn't work)

Need to unlock account to call contracts functions on client side. So i need to use web 3 or web 3 extanded. But it doesn't work.Method are not availebly. Maybe you know some others ways how to call ...
3
votes
1answer
307 views

Why should I be interested in Ethereum? [closed]

Is there a list of features and benefits to using Ethereum?
3
votes
1answer
328 views

Are there any decentralized local exchanges for euro/usd to ether?

Is it possible to have something like a DApp to find the closest Ether owner to purchase or sell ether? Something that can be used as a decentralized market.
3
votes
1answer
583 views

Simple smart contracts to make a bet [closed]

I would like to create a simple smart contract between me and a couple of friends (basically, I'm putting money on the line and betting them that I will do something that they don't think I'll do.) ...
3
votes
2answers
386 views

Is there any way to prevent copied DApps?

I'm a game developer with an idea for Ethereum that would require players to pay a small fee to play. If the contracts are open-source, what would stop someone from duplicating the contract and ...
3
votes
1answer
186 views

Are ICO's that create a new crypto-token exclusively for companies that are building a DApp?

Or can one do an ICO that creates a new crypto-token for any normal application that isn't built as a DApp? I'm asking because there are certain new company ideas that would benefit from utilizing ...
3
votes
1answer
293 views

How it is possible to keep multiple copies of same transaction data at multiple nodes forever?

I have read about DApp "decentralized applications" & Blockchain but still I am unable to understand how multiple nodes can keep whole history of all transactions forever? After some time when ...
3
votes
1answer
669 views

Two way BTC payments for Ethereum smart contract

Are there any good ways to make two way payments by BTC to Ethereum smart contract? Simply put, I want to make a button "Pay by BTC" for DAPP, but it could make a return payment to the return address....
3
votes
1answer
281 views

How did “The DAO” come about? What was the process of its formation?

How did "The DAO" come about? What was the process of its formation? Who "made" it happen?
3
votes
1answer
76 views

MIX IDE on MacOS El Capitan. How To Install, step by step please?

So I've been scouring the web trying to find a way to install MIX IDE and start developing dapps. But wherever I look, the steps seem to be outdated or contradict another site's steps. Now I'm very ...
3
votes
1answer
116 views

How to handle remaining funds after a crowdfund closes (from the tutorial)

The tutorial crowdfunding app has the following function: /* checks if the goal or time limit has been reached and ends the campaign */ function checkGoalReached() afterDeadline { if (...
3
votes
1answer
251 views

What is an 'uDApp'?

The online solidity compiler offers an output of smart contracts labelled uDApp, for example the greeter uDApp looks like that: [{"name":"greeter","interface":"[{\"constant\":false,\"inputs\":[],\"...
3
votes
2answers
67 views

Dual blockchain

Could anybody please help me to understand how dual blockchains work? There are many Dapps which are built on dual blockchains, especially using the combination of Ethereum and Hyperledger. But I am ...
3
votes
2answers
216 views

Using Multiple Accounts from a single physical machine

​Hey all, I was wondering something. I am planning to create a simple Voting Dapp for a closed election, where a number of accounts will be set up ahead of time and pre-authorised to vote. The Voting ...
3
votes
2answers
6k views

What's the difference between using Golang and writing code in Solidity to create a decentralized application?

I've been working on creating my first decentralized application, and I'm currently working on this tutorial which attempts to create a decentralized version of Twitter. I want to integrate an IPFS ...
3
votes
1answer
262 views

Dapp working in metamask but not in mist!

I made a dapp using meteor. I deployed a smart contract in ropsten with remix. My dapp works fine working with metamask without running a geth node.Now if I open same application in Mist browser ...
3
votes
1answer
772 views

Treat ethereum like a database?

This is a noob question - apologies. Suppose I have a smart contract that allows people to register something with an ID. For example, my public address is o4f... and I want to register the ID ...
3
votes
0answers
1k views

account unlock with HTTP access is forbidden [duplicate]

I am using in the geth console and there is a similar error. Do I add "--allow-insecure-unlock" when I "init a node"? personal.unlockAccount(eth.accounts1) Any suggestion would be helpful. Thank ...
3
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0answers
28 views

Nonce question please [duplicate]

can I have the meaning of the word Nonce explained please the question is rejected .. you people really do not wish there to be normal understanding by normal every day members of the public
3
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0answers
53 views

ICO for a startup I am planning to build but have some questions [closed]

I am an software developer with over 11 years of experience in industry and has worked as a software developer for some of the leading firms in vacation rental space. I recently started playing around ...
3
votes
0answers
137 views

Evaluation of DApp (Smart Contract) storage concept with IPFS

i hope you can help me improve or validate my storage concept. I am glad for each suggestion. Since this is my first DApp, i might not consider all possible options for my problem. To understand the ...
3
votes
1answer
704 views

DApp sign transactions on mobile and transfer to server - Web security

I'm currently developing an app for iOS and Android using React Native where users will have a wallet, made using: https://www.npmjs.com/package/ethereumjs-wallet-react-native. They then are able to ...
3
votes
1answer
64 views

How to let uses select their account?

I am quite confusued on how users should select the account they want to use with dapps. Before version 0.9.0 of mist I could just use web3.eth.accounts[0] and let users select what account they want ...
3
votes
0answers
56 views

EVM Invalid JUMP when using webpack app

I am creating a frontend app based on Truffle + Webpack, following this tuto : http://truffleframework.com/tutorials/building-testing-frontend-app-truffle-3, and have no uderstanding of JavaScript at ...
3
votes
0answers
49 views

Casting Object to BigNumber in Meteor DAPPs

Web3 incorporates the BigNumber library in order to handle 256bit numbers. I'm finding this problematic in Meteor as most of Meteor's reactive storage schemes such as Session, ReactiveDict and ...
3
votes
0answers
373 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
528 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
157 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 ...