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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votes
1answer
625 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
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2answers
576 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
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2answers
282 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
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2answers
275 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
349 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
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3answers
250 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
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2answers
817 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
313 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
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4answers
1k 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. ...
2
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1answer
785 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
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1answer
47 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
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1answer
387 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
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1answer
608 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
342 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
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2answers
412 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
57 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
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2answers
160 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
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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
810 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
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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
43 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
38 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
23 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
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1answer
565 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 ...
2
votes
3answers
686 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
2answers
537 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
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3answers
896 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
490 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
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1answer
534 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
98 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
404 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
2answers
40 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
68 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
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1answer
194 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
304 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
60 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
164 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
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2answers
66 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 ...
2
votes
1answer
31 views

If Cryptokitties could take so much computing power in Ethereum network, how can the network support dapps with scale?

There has been so much hype about developing dapps on Ethereum. However, even transactions of cryptokitties could clog the network, how could Ethereum network ever support some application like ...
2
votes
1answer
233 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 ...
2
votes
1answer
1k views

Web3 not defined

I am following this tutorial here: https://medium.com/@merunasgrincalaitis/the-ultimate-end-to-end-tutorial-to-create-and-deploy-a-fully-descentralized-dapp-in-ethereum-18f0cf6d7e0e after running ...
2
votes
1answer
535 views

Sign Ethereum contract transaction w/ web3 on back-end?

How do I directly import via Private Key an account to the web3 library so it can get called by functions like myContract.methods.myMethod().call() & myContract.methods.myMethod().send()? I am not ...
2
votes
1answer
3k views

How to store small database, editable data on blockchain accessible by smart contract?

New to blockchain and smart contracts. Been doing research and I realize I can't update my transaction smart contract. Is it possible to store database data as an entry to the ledger or in another ...
2
votes
1answer
219 views

MetaMask/Web3js ERR_CONTENT_LENGTH_MISMATCH issue

I've deployed my contract with a UI to Ropsten via truffle and ran npm run build and npm run dev to start the server. As soon as I launch localhost (with the account in MetaMask selected) in the ...
2
votes
1answer
242 views

dapp based on ethereum for identity of a person

I have started taking interest in smart contracts and got to understand solidity and erc20 tokens a bit. Still I am not able to understand how can I design a dapp based on ethereum which can be used ...
2
votes
1answer
547 views

is there a platform for hosting APIs similar to AWS Lambda, only decentralized?

I'm looking for a platform that enables to place serverless code for Dapps, without cloud services - so that app can remain completely centralized.
2
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1answer
562 views

Where are DApps hosted?

Certain functionality of a DApp can be hosted on the blockchain as smart contracts. How about other resources such as HTML and JS files? Multiple places reference "Swarm" as the place to host these ...
2
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2answers
959 views

Using Dapps with Mist / Parity

on http://dapps.ethercasts.com/ there are so many dapps. I want to use them. How can I do? Tried it with geth/mist. Since geth does never completely sync, I use it as --light. Then start Mist, the ...
2
votes
1answer
567 views

How to validate information on the network?

This question details sending a message with Ethereum :How do I send an arbitary message to an Ethereum address?. Say we have two parties P1 & P2 , if P1 sends a message to P2 how can P2 verify ...
2
votes
1answer
169 views

Purpose of mist wallet browser . Why doesnt Etheruem supports normal browser

I still don't understand the need for a dedicated browser like Mist. What are the challenges involved in using a normal browser for decentralized apps ?