Questions tagged [dapp]

Questions about applications and projects on EOS: a decentralized application (dapp) does not require any servers or backends

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What is the eosio private key when running on local?

I was trying to test the smart contract I created in my local but I am currently blocked as I cant create a new account. As per EOS documentation, I used the command below to create a new account: ...
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using multi index table as temporary cache

I am making a game that generates a list of winners every round end and lets those winners claim their rewards every round. The way I made it work is to have the server write to a multi index table in ...
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2 answers
150 views

How to listen/get on-chain data in real time

I know that I can use eosjs to read/query multi_index table data from the chain. However, my goal is to listen to/on these changes. Specifically, I want to receive a notification whenever something ...
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Nested depth exceeded

kipping set abi because the new abi is the same as the existing abi Publishing contract... Error 3070002: Runtime Error Processing WASM Error Details: Nested depth exceeded pending console output: ...
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1 answer
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Usecase of EOS for DApps

I have watched several tutorials for building DApps with EOS. But, All they did in tutorials was deploying smart contract and storing data in the tables. What is the point of doing that?(storing data ...
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Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0

I am working on an EOS dApp that is listing dogs (it could be other items) and displaying them on an HTML page. The dApp has a function in its JS file to add dogs. This dApp is working with nodeos up ...
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1 answer
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How to add current date and time in the table so we know when a game score was logged?

For a gaming leaderboard. players will be able to compete with each other through a leaderboard. When a new score is added, it is inserted in to a table that is scoped to the game Each game is ...
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2 votes
3 answers
97 views

Difference between local nodeos instance and setting up a private eos network

Is the local test node instance here same as the one in Ethereum and synchronizes all blocks from the public test chain? Or it does it start from the genesis block and contain only my data? Is there ...
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How can a dApp pay for user's resources since the upgrade to v1.8?

Since the upgrade to v1.8 of EOSIO, it is supposed to be possible for a dApp to pay for the CPU and NET resources of the dApp users. How is this achieved on a technical level?
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how to connect eos smart contact with flutter app

flutter has this package name Eosdart,Im able to get the detail from blockchain with app like account detail,but im unable to push the transaction. I want to push a transaction which carry argument ...
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2 answers
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How to tell a certain contract in indeed used in a dApp?

The dapp review sites often list the contract names a dapp is using. I see that this is added by whoever has added that dApp into the review site. But is there a verifiable way (through an explorer ...
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List of EOSIO related telegram channels

Most of the EOS.IO community is active on the Telegram communications platform. Can we produce a list of all the appropriate Telegram group chats related to EOS.IO?
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Time point to string

I am currently trying to get the current time using time_point_sec(now()); Does someone know how to convert that to a std::string?
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Double sign a transaction, first on client, second on server

I am struggling with getting the following scenario to work, I want to create a transaction signed by two parties (not via the multisig contract, just a transaction with 2 signatures). One is the ...
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1 answer
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As of January 2019, what are the top 10 Dapps on EOS?

What are the top DAPPS on EOS as of 2019 JAN? Dapps as in "fully" decentralized and also ones that are "centralized". I believe many of the EOS dapps are centralized and not really "decentralized" as ...
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2 votes
2 answers
315 views

A possible alternative sign in/login process instead of firebase auth / amazon cognito using an eos contract?

I had the the idea of a secure alternative login process using an EOS smart contract instead of firebase or Amazon cognito. I would like to know if something like this feasible? My idea is somewhat ...
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usr/bin/cleos no such file or directory

I am using Ubuntu 18.04 LTS. I am trying to deploy a smart contract, following a Steemit post but I am getting an error that I don't really understand. I have run nodeos according to the the Eos ...
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EOS RAM requirement for hosting a full node?

https://medium.com/@bytemaster/eosio-ram-market-bancor-algorithm-b8e8d4e20c73 In this article, Dan pointed to the fact that "Keeping RAM scarce (64 GB) lowers the cost of hosting a full node, but ...
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Is it possible to operate with not EOS-based tokens in EOS dapps?

I can't understand exactly. Is it possible to use not EOS based tokens (eth for example) for payment purpose in EOS dapp directly. Or it can be done only via 3rd party exchanges?
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Payment to dapp with text comments best practice

I am new in eos, so maybe i say something strange. I want to create a dapp that can receive payments from mobile wallets with text comments. I imagine this like front end where user type text and ...
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4 votes
1 answer
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BUG when two accounts send action at the same time to modify multiindex table

It took me several days to find the bug. I got a table like this TABLE t {uint64_t key, name player1, name player2, uint64_t status}; When the contract received the specific action, it will go ...
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is that a good way to gather smart contract action data in backend with Demux.js?

there is a Bill functionality in my DApp, which need gather millions of EOS action data to make up a token transfer data for front end to display. the question is, it takes quite a long time. if it ...
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3 votes
1 answer
178 views

Storing the data in "Memo" of block chain transaction

Can I store large size of data such as MP3 in Memo? Are there any implementation examples? To store the data or any comments in Memo, should I send some amount of EOS? Can I store the data without ...
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2 votes
1 answer
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Reclaim RAM for dApp that creates an account and transfers funds

A dApp that creates a new account and transfers EOS to that account will have to 'pay' for 240 bytes of RAM for the new balance object on the new account. When the new account transfers some funds, ...
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3 votes
2 answers
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eosio-cpp -abigen hello.cpp -o hello.wasm

Ubuntu 18.04.1 on VMware (Windows 10 64bit) EOSIO v1.4.1 eosio.cdt-1.3.2 i just run the compiler like this : win@ubuntu:~/eos$ eosio-cpp -abigen hello.cpp -o hello.wasm then, the terminal stopped ...
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Onboarding new eos users to a note taking dapp

I have a note taking dapp on the Ardor blockchain and say I wanted to migrate it to EOS. Currently these notes are just palin text messages stored in the blockchain directly (ardor data cloud). In ...
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1 vote
1 answer
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What gambling type dapps have been created for EOS?

What are some gambling dapps that are created with EOS? Are there any gambling dapps that are not website centralized as in I can play the dapp with just a simple html/js file interacting with the EOS ...
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1 vote
1 answer
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Is there a list of Ethereum Dapps that have confirmed moving over to EOS?

People say Ethereum dapps are moving to EOS platform. But where is this list of Dapps? And which ones are the most active that is actually moving to EOS?
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3 votes
1 answer
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Where can a startup seek funding from block.one for building out EOS applications?

Is there a place where one can goto for funding from block.one for building out EOS apps?
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1 vote
1 answer
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other way to let contract account provide for cpu/bandwidth than delegatew/undelegatew?

as far as i can tell it is somehow inconvenient to let the user of an contract "pay" for the cpu time. I thought that the one who manages the contract, has to stake for cpu/bandwidth, so user can use ...
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2 votes
1 answer
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Can an object of the class 'contract' or a class that inherits 'contract' be created in the cpp file of the contract we are making?

Can an object of the class 'contract' or a class that inherits 'contract' be created in the cpp file of the contract we are making?
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6 votes
1 answer
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Make Ledger Reflect All RAM Changes

If we want those witnessing the chain to know about our apps state without any knowledge of our service layer, what might be the best approach? Since the ledger only records the data given to it in an ...
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2 votes
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Why is a BlockIndexState model required when using demux.js?

I was checking the project eosio-project-demux-example since I want to use demux.js in my own project. I have doubts about the mongoose model BlockIndexState. I would like to know what is it used for....
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4 votes
1 answer
223 views

Why do we have to provide private keys in eosjs?

Eosjs takes a parametre in its config viz. keyProvide where we have to pass the private keys. Eos = require('eosjs') // Private key or keys (array) provided statically or by way of a function. // ...
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3 votes
1 answer
579 views

use EOS as private blockchain for a loyalty system

We are working on a loyalty system powered by blockchain. Using blockchain enables us to have basic security at the beginning and scale easily. it makes total sense to us. the loyalty system will ...
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2 votes
2 answers
461 views

I can not find a definition for require_auth2, what does this do and how?

require_auth2 is used in action.hpp's require_auth. void require_auth(const permission_level& level) { require_auth2( level.actor, level.permission ); } require_auth2 is declared in action.h....
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Why the EOS documentation still says Dawn 4.1?

Has the documentation been updated to 1.0?
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2 answers
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EOS Programming tools in the near future?

I am starting to make my first steps on EOS programming but I find the tools available to be quite raw at the time being. There are many things (Integrated IDEs, platform installers, etc) that could ...
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5 votes
1 answer
361 views

Why Launch dapp On-Chain VS Side-Chain?

I am struggling to come up with reasons to launch a dApp intended of reaching significant size completely on the main chain vs a customized side chain. I think either would utilize a token. By ...
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1 vote
1 answer
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Does the RAM burn out forever or is it reusable after some time?

I would like to purchase RAM to do some actions such as smart contract executions as well as token transfers. On Ethereum, you would have to pay for gas and the gas burns forever. Am I going to be ...
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3 votes
5 answers
322 views

Do you know any useful links to help you develop DApp?

I've gathered links to help you develop DApp. I want more.
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1 vote
1 answer
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Authorization flow in dapps

How authorization works in EOS dapps? I mean in application layer. For example in a trello like application how we manage to just the participants in the project are able to see the tasks?
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1 vote
1 answer
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Does EOS VC invest in dApps in exchange for equity or tokens?

EOS VC has taken forward steps to invest in dApps in partnership with other VCs. In the traditional world, VCs invest in companies in return for equity. What does EOS VC and their partners seek in ...
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1 vote
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Is it permissible for dApps to use 'EOS' in their brand name?

Are there any trademark restrictions on naming dApps EOSbook, EOScabs, EOSfood etc? If the answer is no, then isn't it possible that somebody out there might go out and obtain a copyright for 'EOS'? ...
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1 vote
2 answers
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Difference Between Eosio.token and Eosio.system

I have an idea for a DApp I'm looking to build after launch. It won't be large, but it'll be on a large platform (won't name it here because I don't want anyone taking my idea lol). After cloning the ...
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3 votes
1 answer
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Can an action in a smart contract concurrently executed?

In a smart contract if an action is executed simultaneously and if it tries to modify the same record in a table(using multi index API), How to add mutual exclusion to the shared resources? For eg. ...
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2 votes
2 answers
72 views

How will dApps & DACs built on EOS 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 ...
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8 votes
2 answers
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What is the correct way of issuing your own token?

There is an esoio.token contract. This contract be used for issuing and storing many tokens starting with EOS. However, is it possible to issue tokens without using the eosio.token contract? What is ...
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10 votes
1 answer
182 views

How to architect token economies for DACs / DAOs built on EOS?

From the keynotes and interviews of the Block.one team it is evident that they envision a world of Decentralized Autonomous Communities (DACs) and not just decentralized apps. Steemit is the primary ...
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5 votes
2 answers
878 views

Can someone explain EOS sidechains to me?

Independent platform, Main chain, sidechains, smart contracts. Can someone define these terms for me? I don't quite understand the idea of sidechains. Is sidechains something like threads in ...
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