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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6
votes
2answers
477 views

Customized oracle to access and make changes to data on a cloud service

Although, there is some literature mentioning the possibilities of oracles to supply external data to smart contracts in a blockchain, I am a newb and was wondering whether there is a successful ...
6
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1answer
297 views

What features are possible on Ethereum than can never be implemented with Rootstock

I understand that there are limitations to what type of code can run on the Bitcoin network and how much data can be stored in each transaction. With a 2 way pegging like Rootstock many of the smart ...
1
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1answer
94 views

I found a useful Ethereum script. How do I run it ELI5?

What's the least painful option to use the Stackexchange Bounty script described here? I'm dreaming of a chrome extension :)
5
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1answer
120 views

Is there a reason why Ethereum DAPPS would benefit from their own blockchains?

For example even if all of their useful functions will occur on the ETH blockchain, would a separate blockchain simplify the creation of DAPP tokens to trade on centralized exchanges?
3
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2answers
376 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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0answers
516 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. ...
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0answers
62 views

Can you provide a real world example of using Ethereum network? [duplicate]

Is there any practical real world example which you can provide in order to understand the simple benefits for using Ethereum network by the ordinary user? Especially in terms of purchasing something ...
5
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2answers
2k views

Forgot my private key in ether.li

I've bought 50 ethers on btc direct 2 weeks ago. I've send it to my user account on ether.li. What was not the best choice. Because now I need the private key to withdraw it. I can't remember I had to ...
3
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0answers
153 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? ...
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0answers
134 views

Most expensive DAPP (in terms of gas usage per transaction) [closed]

Which DAPP currently running or in development is likely to use the most gas per transaction?
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1answer
1k views

How to read a data sent to my Smart Contract

How can I read/ get a data that has ben sent to my smart contract ? I tested sendTransaction({data: xyz }) and when I tried to get this data from the Smart Contract using msg.data I got NULL this ...
5
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1answer
383 views

Does Eris Dapps end-users need an Ethereum enabled browser and and their own running node?

Recently I’ve been doing some research on blockchains and smart contracts. I came across the concept of public, access controled and private blockchains and smart contracts. Ethereum and Eris can be ...
2
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1answer
605 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 ...
4
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0answers
360 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 ...
7
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3answers
2k views

What are GavCoins and what is their significance?

Quite simply, what are GavCoins and what is their significance?
6
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1answer
432 views

Is it possible to exhaustively search through all Ethereum contracts in a local node

Currently building a stock exchange on Ethereum. Based on the current design, I have users creating individual buy orders as separate contracts tied to a central stock counter contract in the form of ...
4
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1answer
91 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 ...
5
votes
1answer
471 views

How can I open a dapp in mist (v0.7.1)?

I can't find a way to open a dapp/enter url in Mist browser (v0.7.1). Do I need to download any special build, build it from master, or is there a switch for this?
4
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1answer
87 views

As Dapps obviously need JS how will they be accessible to visually impaired people?

How about using screen readers or text only browsers with Dapps? Has someone ever tried existing Dapps with this tools? Thanks.
8
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1answer
225 views

How many topics can a whisper message have?

I'm thinking in a new DAPP that may use whisper extensively. To evaluate the viability of the DAPP, I need to know if there is a limit on the number of topics that a whisper message can have. I would ...
7
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2answers
847 views

Does Ethereum offer encrypted peer to peer communication applications?

I am wondering if Ethereum can be used for encrypted peer to peer communication like delivering encrypted short messages or encrypted data in bulk between two or multiple parties. Are there any ...
4
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1answer
708 views

Exposing Geth to Hybrid mobile app

I'm making a Hybrid mobile app and planning to use web3.js to access Geth. What's the best way to expose Geth to the hybrid mobile app? I will be running Geth on ubuntu 14.04 on Aws
5
votes
2answers
360 views

What Ethereum applications can I use without having to mine or buy ether?

I would like to play around with Ethereum, create contracts, do stuff. I want to learn, not do anything serious for now. Dao Wars seems like a good start, but it costs 3 ETH just to start trying. Is ...
9
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3answers
1k views

How would stablecoins work on Ethereum?

The idea of a stablecoin in Ethereum is to create a token that is pegged to the price of say $1 USD. What are the main ways of achieving a stable cryptocurrency? What DApps are implementing them and ...
2
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1answer
339 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 ...
3
votes
1answer
749 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-...
4
votes
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 ...
17
votes
4answers
15k views

How do I send an arbitary message to an Ethereum address?

How can I send a message to another Ethereum address? And how would that user receiving know that its a message? Is there an Ethereum wallet that will show that I sent a message to that address? And ...
8
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1answer
12k views

Where can I learn how to develop DApps using the solidity programming language? [closed]

What resources exist to help people learn the solidity programming language and create smart contracts & DApps on Ethereum?
5
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1answer
266 views

AlethZero and Mix problems

I am trying to get started and learn Ethereum development, mainly using the tutorial at dappsforbeginners.wordpress.com. However, several features referred to in the tutorial are simply not appearing ...
3
votes
1answer
441 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 ...
34
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2answers
19k views

How does Lisk differ from Ethereum?

Lisk is going to be a full stack DApp development framework for building and distributing decentralized applications. It's currently in the crowdfunding stage but got also added to Microsofts ...
1
vote
1answer
391 views

Is it possible to embedd the UI of DApp in the blockchain?

I have read the answers for this question as well as their linked resources, but I didn't found the answer for the following question: is it possible to embedd the UI of ÐApp in the blockchain? If I ...
32
votes
1answer
15k views

What does the keyword “memory” do exactly?

I've been looking through the code of Etherdice and noticed that some variables are declared like ParserResult memory result; and I haven't found the keyword "memory" in any documentation. What I ...
4
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2answers
408 views

Is it possible to mine slowly?

I'm developing a DAPP in a laptop. I setup a private test blockchain with one node to develop locally and do not have to spend real ethers. It works fine, but when I start mining, the laptop gets ...
8
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2answers
2k views

Will Ethereum be the Internet 2.0?

I've been following Ethereum since it was announced and I remember that the appeal was that it was "Bitcoin 2.0". While email replaced the post and Bitcoin replaced fiat, Ethereum would replace legal ...
5
votes
1answer
171 views

How can I see the payouts of this Ponzi scheme dapp?

Towards the very beginning of the Ethereum release, a friend participated in a Ponzi scheme dapp by sending 1 ETH here. He was among the first! For some reason, it seems he has not received any ...
5
votes
1answer
851 views

What is BlockApps and how can it be used with Ethereum?

BlockApps says: Customized, permissioned private Blockchain ledger to your specifications. Based on Turing-complete Ethereum standards, your Blockchain has full Smart Contract support built-in. ...
10
votes
2answers
4k views

Can I run a website 'on' ethereum or only 'with' ethereum?

Do you run a website 'on' ethereum or 'with' ethereum and if the latter, is that only with 'nodejs'?
6
votes
2answers
957 views

Ethereum fork of OpenBazaar

Is anyone forking OpenBazaar for Ethereum? OpenBazaar is a Bitcoin marketplace, and the OpenBazaar developers have expressed no interest to integrate any currencies other than Bitcoin.
4
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1answer
264 views

EtherEx decentralized exchange

Been waiting for a long time to be able to access a decentralized exchange. When will EtherEx be launched and will it support BTC ETH pair?
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 ...
7
votes
1answer
1k views

What reputation systems are implemented on Ethereum? [closed]

I'm looking into finding some sort of reputation system on Ethereum. Are there any projects out there already that do this? I found a DEVCON1 video about reputation systems and a few people discussing ...
18
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3answers
6k views

How can DApp developers profit from their work?

Suppose that I make a new, cool DApp that gets very popular. In order to cover development costs and make some profit, I charge users of the app a small quantity which is required to use to app - all ...
2
votes
2answers
280 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?
3
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1answer
307 views

Why should I be interested in Ethereum? [closed]

Is there a list of features and benefits to using Ethereum?
4
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2answers
841 views

What are the ways I can contribute to Ethereum?

I'd like to know more about how to contribute, both on a technical and non technical perspective
3
votes
1answer
327 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
242 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\":[],\"...
9
votes
2answers
4k views

How to connect a web site to a geth node?

Before the DApp-browser Mist was available, this web3 library seems the way to go on building a bridge from contract to a frontend (web site). But, I cannot get the very basic examples to work. ...