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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.

9
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4answers
620 views

How will dApps built on ETH deal with the requirements of GDPR?

GDPR expects it's citizens to have the 'right to be forgotten'. A company failing to fulfill this obligation is expected to pay a hefty fine. How will decentralized autonomous communities who store ...
0
votes
2answers
78 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 ...
1
vote
3answers
111 views

a question about oraclize api

anyone know how oraclize api is working. I read the source code files on github.com/oraclize/ethereum_api . it need a "__callback" function in my contract to receive the result, is it means there has ...
1
vote
1answer
64 views

Is there a “Desktop Dapp”?

The most of "decentralized applications" are a "web" application as follows : Front End (usually JavaScript) => Smart Contract (usually Solidity) => Blockchain (usually Ethereum) Is this the ...
2
votes
1answer
400 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 ...
1
vote
2answers
218 views

Storing a document with multiple large video files

What's the best way to store a document with multiple large video and CAD files on Ethereum. I am just a beginner to Ethereum. The document is a science experiment with multiple documents linked. I'd ...
0
votes
0answers
24 views

msg.value depends on scope? [duplicate]

I am a beginner of solidity and rewriting a Casino DApp code based on the following link: https://itnext.io/create-your-first-ethereum-dapp-with-web3-and-vue-js-c7221af1ed82 Now I am testing the ...
-1
votes
1answer
97 views

What are the most active communities (2018) for dapp developers? [closed]

I'm trying to determine if there are community hubs (forums, chats, etc) that most dapp developers use and they can't live without. Where do they hang around to get involved in discussions, learn, ...
2
votes
0answers
149 views

Decentralized File Storage on Ethereum white paper

I am reading white paper of Ethereum, and I am confused by this example of the Section. Decentralized File Storage, which is part of the Section. Applications: The key underpinning piece of such a ...
1
vote
0answers
26 views

Can Ethereum be successful in a world where EOS meets all of its promises? Why/Why Not? [closed]

As the title states, the EOS platform looks incredibly promising, but looking at the recent blog posts the maximum 6k transactions per second is much less than the promised 100k+ per second. I'm aware ...
1
vote
0answers
113 views

Toshi browser vs. Google Chrome browser to interact with Dapp?

Toshi is a browser to interact with Dapps such that after uploading our Dapp (including solidity smart contract, Javascript and HTML code) on a server, we can search our Dapp using its URL (ex: www....
0
votes
1answer
58 views

Every Solidity code is necessarily called Smart Contract?

Is it correct to say that even a Solidity code that doesn't contain any financial transactions to exchange digital assets or tokens and it only stores some information on the blockchain is a Smart ...
2
votes
1answer
584 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."
0
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0answers
21 views

Problem with Distribution Contract

Whenever I try to execute it keeps showing FailedTransfer: pragma solidity ^0.4.16; contract Ownable { address public owner; function Ownable() { owner = msg.sender; ...
0
votes
2answers
135 views

JavaScript for Dapp

Can the following libraries and frameworks be used to build the Client-Side of DApps ? Specially Ember Backbone Aurelia Polymer jQeury
0
votes
1answer
53 views

Can somebody check my understanding of DApps and Smart contracts

can somebody check my understanding on DApps and smart contracts in general? (Please excuse the long winded-ness I’ve only been reading about DApp’s for 3 days now so I’m very new and I’m kind of ...
1
vote
0answers
52 views

Distribution Contract Not Working

I'm trying to set up a distribution contract to send an ERC20 token to multiple addresses at the same time. After multiple attempts, the transfer keeps failing. Transactions are approved, the problem ...
1
vote
1answer
215 views

Trying to understand balanceOf.call function

I am playing around with my ERC20 token. I created token on Rinkeby test network. I can't understand where I did a mistake. I am interacting with my token in truffle console. After command Token....
1
vote
0answers
29 views

Keeping Contract Address, Web3 HttpProvider and Account Address away from the DApp UI/Frontend User

I am building with Quorum and Web3js. As I build the DApp UI/frontend, I realised that details such as address of the node, contract address and the account address (from:) are in plain text. One just ...
0
votes
1answer
37 views

Decentralising the presentation tier/layer of a DApp

Though the data/state tier (i.e., the ledger), business logic tier (i.e., smart contracts) and storage tier (i.e., file storage e.g., IPFS, etc) is decentralised, understand that the presentation ...
0
votes
1answer
166 views

Access to a Dapp on a private network from mobile

Is it possible to speak with a Dapp (or with a smart contract) stored on my private network from mobile?
0
votes
0answers
139 views

parsing event result in DApp

I created a DApp that watch for specific event on blockchain and prints that event information to the console as shown below. code var AccessManagerERC20ContractAddress = "...
0
votes
0answers
504 views

What is a DApp Browser? [duplicate]

I've seen many examples of DApp Browsers: Mist - official GUI dapp browser developed by the foundation, alpha stage. Mist as Wallet dapp is in beta. Status - Mobile Ethereum browser (...
0
votes
0answers
242 views

How to use MetaMask Web3 with Truffle promises

My project uses the react truffle box, and I use the getWeb3 method that comes with it. After calling that method, I store the web3 object on Redux's state tree via the action creator storeWeb3. ...
0
votes
1answer
352 views

Input data on Solidity

I'm trying to do something simple like Hello World that shows on a webpage. I've written a smart contract like this: pragma solidity ^0.4.18; contract HelloContract { string word = "Hello World!"...
2
votes
3answers
228 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...
0
votes
0answers
82 views

Get notified in JavaScript or web3, when user has selected address in MetaMask

I use MetaMask on DApp page. I need to be notified if / when user has selected /changed address in MetaMask. The best solution I have guessed: window.addEventListener('focus', function () { console....
2
votes
2answers
522 views

Detailed tutorial for DApp programming [closed]

I am new to node js and I tried to follow some tutorials to understand it. But, when I started writing DApp code, I get lot of errors like this (calling smart contract functions from app.js). I face ...
0
votes
3answers
1k views

calling smart contract functions from app.js

I deployed a smart contract to ganache network using truffle from account1. The code of smart contract is as follows. pragma solidity ^0.4.0; import "./strings.sol"; import "./safemath.sol"; ...
2
votes
2answers
645 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 ...
0
votes
4answers
250 views

Accessing DAPPs through HTTP

The blockchain is all about serverless and removing the third party. But I saw many DAPPs accessible through HTTP. Isn't this breaking the serverless concept? I read in a lot of places that IPFS aims ...
1
vote
1answer
155 views

Which ethereum dapps are 100% decentralized and not semi-decentralized (centralized)?

Correct me if I'm wrong here, but I see dapps as independent solo code that you can download to you computer and it interacts with the Ethereum blockchain. Looking at crypto kitties, you have to ...
0
votes
1answer
148 views

How fast and scalable is a Dapp build on ethereum?

I am a beginner to Dapps on ethereum and smart contracts but I wanted to ask three questions on building on top of ethereum. Firstly, how fast would an Dapp with a token will the transactions per ...
0
votes
1answer
24 views

How much hash power is acutally used for dapp on the ehereum network

In any given block you can see 3 eth is rewarded to the miner who found it, and 0.??? is rewarded for process transactions. Both operations require computation and storage power, but clearly finding ...
0
votes
1answer
35 views

Is an Ethereum paper wallet generator considered a dapp?

I made an Ethereum paper wallet generator. Is this considered a dapp as it can be downloaded and run without any central server to generate ethereum addresses? Or does a dapp have to be tied to a ...
0
votes
1answer
127 views

What is the right way to access DAAPs?

I am a newbie and I am a bit confused about the deploying process of the DAPPs, I have some unclear points Can I access DAPPs outside Mist browser? Can I access them using Chrome for example? ...
0
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0answers
25 views

How does MEW work?

My understanding of dapps is that it needs web3 and to be able to change state in the blockchain, then you need 1) metamask or 2) run your own ethereum node. Please correct me if I am wrong. How is it ...
0
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0answers
7 views

On-state dApp rollback, any dApp or contract that has implemented that?

For some dApps it could be useful to have the ability to fork or rollback on-state, without altering the rest of the blockchain, is there any work done on that?
0
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0answers
47 views

web3 solidity meteor payable in the Dapp

web3 solidity meteor payable in the Dapp hi I am currently building a Dapp by meteor, i wish user can pay the 1 ether to my contract, this function in the browser-solidity is work, but i don't know ...
0
votes
1answer
20 views

Can Dapp respond to an API evocation which in turn calls an EOA and then evoke a contract?

Can a Dapp (leveraging web3.js) respond to an API evocation from an external system which in turn calls an EOA and then evoke a contract on the blockchain? External system calls a Dapp Dapp calls a ...
0
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0answers
28 views

promises for below smart contract

Please help me with web3js part for below contract. I want to attach my smart contract to frontend. I am developing in truffle environment and I am not comfortable with promises. pragma solidity ^0.4....
0
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0answers
90 views

SC: Monthly Subscription Feature

Warning: Newbie here. Hi guys, I was wondering if it is possible to program a direct-debit like feature, so that users can authorize a smart contract to take X amount of ETH from them on X date ...
1
vote
0answers
137 views

how distributed cloud storage works with ethereum blockchain?

Distributed Cloud storage is a great concept , I have been doing a lot of search on this topic but couldn't get the exact information i am looking for:- How the projects like Storj are using the ...
1
vote
0answers
136 views

Can't transfer balance from contract to parent contract

I'm having trouble transferring remaining funds from a Contract to it's controlling Contract Factory. I'm trying to do the following. Create a new Service with Factory->createService() Add funds to ...
1
vote
1answer
48 views

How do projects which offer tokens in ICO work afterwards?

What is the general revenue model for ICO projects apart from token sale? I read somewhere once tokens are sold, founders are left with limited number of tokens with them let's say 10 percent. ...
0
votes
0answers
149 views

How to deploy a Smart Contract in Ethereum on Azure?

Iam trying to deploy a smart contract in Azure's Ethereum on Azure. I have created a blockchain in that but now I need to deploy a smart contract and design a UI for the same. I want to use Remix to ...
0
votes
2answers
228 views

ecrecover in solidity returning null address [duplicate]

I need help with Ethereum address verification. I'm following the tutorial on signing and validating Ethereum address. GitHub code. I'm confused by my actual result of the address after I ran ...
5
votes
3answers
386 views

Constant contract calls from web3 returning inconsistent values

I've got this dapp on the main net here. The following contract has been deployed at this address : pragma solidity ^0.4.19; import 'zeppelin-solidity/contracts/ownership/Ownable.sol'; import '...
0
votes
0answers
193 views

In truffle Console Works, but when called in Javascript, Metamask hangs, Solidity contract doesn't update

So I have a function where I am asking the user to send two strings and 1 ether at the same time. When I execute the function in the console, the solidity contract is updated. When I execute the same ...
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votes
0answers
30 views

javascript : how can pass the data to other Function

I am currently building a Dapp. I want to know how can I pass the data to the other Function. picture1 : Contract.FunOp_02( "1", ... this "1" if I input 1, it will display data1 like a picture1 //...