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
310 views

Why exposing the personal API is unsafe?

From what I am reading in various places such as here ,here or here, it is not safe to expose the personal api to the front-end Dapp via RPC. Hence asking the users to run geth --rpc --rpcapi "eth,...
4
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1answer
118 views

Dapp: Ask mist to sign a transaction

As I see it dapps can only be used from webbrowsers (apart from the outdated secret open source release of the mist browser or whatever that was called). That leaves the question how to send ...
4
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1answer
101 views

Strange popup window trying to send ether when I run aleth zero. What should I do?

I ran aleth zero and mined with aleth one a while back. I had mined some ether from a mining pool. Now when I run aleth zero (updated client for windows), I get an annoying and unstoppable pop up ...
4
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1answer
2k views

Where exactly do DApps run? Who gets rewarded for running them? [duplicate]

So I am currently running a full node, as well as a GPU miner. I am curious first of all where do DApps get run? They wouldn't make sense to run on a GPU as they aren't very parallizable, so I am ...
4
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1answer
1k 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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2answers
407 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 ...
4
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1answer
72 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 ...
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
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2answers
326 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
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0answers
113 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 ...
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0answers
369 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
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1answer
151 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
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1answer
654 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
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2answers
899 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
479 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
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2answers
3k 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
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2answers
612 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
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2answers
305 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
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4answers
2k views

Login system for DAPP

I'm building Dapp on Ethereum. The main feature of this Dapp is Register/Login logic. I Don't want to use Metamask, but I want to make Login system like MyEtherWallet without any chrome extention. ...
3
votes
4answers
771 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
526 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
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1answer
697 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
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1answer
282 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
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2answers
381 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
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1answer
791 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
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 ...
3
votes
1answer
621 views

How to track ownership of a real-world object?

Use Case I have a number of real-world objects that are stored in a central location. The deed to that object can be bought and sold without the actual object going anywhere. Deeds can be sold for ...
3
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1answer
242 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
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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
334 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
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1answer
944 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
432 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
190 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
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1answer
306 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
704 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
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1answer
289 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
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1answer
81 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
119 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
264 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
1answer
33 views

How do I send multiple transactions as one transaction?

Say I need a user to approve a contract with an erc20 token balance and then the contract can execute it's function after. Typically, I would have to do an approve transaction with a nonce of 1 and ...
3
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2answers
80 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
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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
284 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
780 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
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0answers
3k 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
54 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
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0answers
145 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
2answers
203 views

Mining, Ethers and Private Blockchain DAPPs

I am building a private Blockchain cluster DAPP envisaged to have 5 to 10 parties owning their own nodes (or node clusters). At this moment, there is no specific mandate to incentivize miners, though ...
3
votes
1answer
787 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 ...

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