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Questions tagged [off-chain]

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Having issue with Chainklink job

I'm trying to set up a job in my Chainlink Node. I deployed Operator and ATestnetConsumer contracts as mentioned in here. When I call the requestEthereumPrice function, the node starts a job run but ...
Foad's user avatar
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1 vote
1 answer
37 views

Ethereum off chain data

I was wondering if it's currently possible to verify personal or private information on-chain on Ethereum. Specifically, I would like it to be verifiable that a certain amount of an ETF is held on a ...
Quham Adefila's user avatar
1 vote
2 answers
77 views

Are there examples of on-chain and off-chain governance working together?

I am aware of off-chain governance and on-chain governance examples but I wanted to create a hybrid in between: A DAO where off-chain user scores are reflected to the on-chain and total voting power ...
MehmedB's user avatar
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1 answer
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Can you schedule an eth transfer in the future?

Is it possible for person A to schedule an eth transfer to person B 1 week in the future, possibly by offchain signing the transaction? I've seen the concept of offchain signing and am wondering if ...
Nik C's user avatar
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How do Payment Channel Networks such as Raiden actually increase blockchain scalability?

Question : If a payment channel network that routes multi-hop payments uses HTLC's (hash time locked contracts) which must first lock up funds on-chain and also be redeemed on-chain then how are they ...
Luke Wanless's user avatar
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155 views

Autosign off-chain signatures in 1/n Gnosis Safe

I'm playing around with the WalletConnect off-chain signature repo: https://github.com/5afe/eip-1271-dapp/tree/main and I'm trying to find a way to create off-chain signed proposals without having to ...
Liberalite's user avatar
1 vote
1 answer
144 views

offchain signing of an erc20 transfer() and avoiding replay attacks

This is my first question on stackexchange :D Question: I'm building a smart contract that matches lenders (of tokens) to borrowers on mainnet. To avoid gas expenditure, I want the lender to sign an ...
codeBull's user avatar
1 vote
2 answers
531 views

Why do people deploy MEV bots on chain?

More specifically, is there any advantages to be had with having the bot trading logic on chain in a smart contract? Versus doing it all off chain, watching for events and submitting the transaction
hear har's user avatar
1 vote
1 answer
18 views

Using Chalink oracle for ethereum application

Is using any Offchain data like chainlink oracle is safe as far security is concerned for any ethereum application and how does ethereum ensures that is is safe to use them
Kundan Kumar's user avatar
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1 answer
17 views

Contracts design

I have a project where users deploy their own instances of a contract and those instances need off-chain data through chainlink oracle, what's the best between making the contract has its own request ...
noro meb's user avatar
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1 vote
1 answer
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are there any other off-chain scaling solution then layer-2?

I was reading this: https://ethereum.org/en/developers/docs/scaling/#off-chain-scaling my doubt is: are there any other off-chain scaling solutions then layer-2. Can a centralised, non-blockchain ...
aakash4dev's user avatar
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1 answer
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How to Implement off chain Keepers for Decentralize Perpetual Exchanges like GMX.io?

I'm attempting to clone gmx.io. I understand most of the on-chain and Dex concepts, but I'm stumped on how to establish an off-chain Keepers they did not opensource the code for that, so could you ...
Shayan Shaikh's user avatar
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1 answer
35 views

Does Taker on 0x generate only 1 tx ? (not 2, one for maker and one for taker)

I am writing a book about cryptocurrency history. I have questions about 0x, Etherdelta, and IDEX. Question 1. This is the last trading process from 0x whitepaper page 5. Taker submits the makers ...
Slowblogger's user avatar
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1 answer
553 views

Chainlink Oracle - What events are emitted and which should i listen to for price updates?

I am looking for events which are emitted by Chainlink oracles when price updates occur. E.g. the Aggregator for ETH/USD price (https://etherscan.io/address/0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419) ...
Plus Ultra's user avatar
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1 answer
24 views

Have user pay for withdrawing funds from owner only function

I have some complicated user case and have decided to go with a hybrid offchain and onchain method for my rewards system. The issue is that we want rewards to only be available to certain users that ...
yuvaly's user avatar
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1 vote
2 answers
73 views

Off-chain Bank Payments & oracles

hey fellow solidity devs ! i am working on a DAO right now and one of the requirements is that members pay the DAO with fiat money off-chain (using traditional banks). i obviously want to log that ...
ftank's user avatar
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1 answer
47 views

Assigning roles to addresses after off-chain KYC verification

I have a marketplace smart contract from which users can buy NFTs, however these users need to have been verified before being able to purchase them. The verification is done off-chain through a third-...
human's user avatar
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1 answer
100 views

How to sort off-chain

I read this article about sorting an array on an off-chain backend, but there are some things I can't wrap my head around. For example, say I have an array of times in no particular order arr ...
HeeeeSark's user avatar
1 vote
3 answers
105 views

DAO Governance Off Chain

What are good methods for DAO decisions to be implemented off chain? If a company is looking to start a DAO to manage a specific centralized service (say a website, manufacturing plant, etc) through ...
YigalZamora's user avatar
0 votes
2 answers
59 views

Ethereum applications with off-chain business logic

I am looking for real-world applications using Ethereum Smart Contracts that include complex off-chain business logic. I could find several useful examples of DApps, however, the off-chain layer often ...
ursa-ring's user avatar
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1 answer
320 views

Questions about the fulfill function in the Chainlink API Call tutorial

I was going through the Chainlink tutorial on APIs and had some questions about the fulfill function in the contract below. From how I understand it, the third argument of request object inside the ...
kay_m43's user avatar
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3 votes
1 answer
1k views

What is the default query limit on The Graph?

Say I have a GraphQL query like this, which I execute against a subgraph powered by The Graph: { foo { id bar } } What is the default number of instances of foo that a subgraph returns?
Paul Razvan Berg's user avatar
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0 answers
40 views

How to store private data on blockchain application using a database?

I'm doing a project on healthcare data management Dapp. My project contains the actors as the doctor, patient and hospital. Actors have the attributes them self like name, id, age, hospital ...
hunter21actual's user avatar
1 vote
0 answers
17 views

Verification system for vaccination, medicine [closed]

Project Idea, Need Guidance. Verification system for vaccination. Vaccination confirmation per individual, multiple times, different locations. Can also be used for ticketing, voucher confirmation, ...
BeyondGalaxy's user avatar
0 votes
1 answer
2k views

On-chain vs Off-chain NFT art platforms

In this thread, an NFT cryptoart collector with deep pockets named beanie said, I have bought a few pieces on FND cause they were significantly cheaper, but now realize they were priced that way for ...
user610620's user avatar
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4 votes
1 answer
917 views

If crypto art is stored off-chain, how does the collector have any control over their NFT's contents if the server where it is saved shuts down?

CryptoKitties essentially sells crypto art NFTs to collectors on the Ethereum blockchain. However, the pictures of the cryptokitties are stored on the company's server, since the NFT merely represents ...
user610620's user avatar
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2 votes
2 answers
1k views

What tokenized assets can be stored on-chain?

Examples of digital assets that can be tokenized as NFTs are: crypto art (.jpg or .png file stored off-chain) game weapons or characters Examples of physical assets that can be tokenized as NFTs are:...
user610620's user avatar
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0 votes
1 answer
267 views

Off chain random matchmaking

Preface I am new to learning Solidity and about smart contracts in general. I think that asking here would save me time rather than trying to fully figure things out myself. Scenario Suppose that I ...
David J's user avatar
2 votes
1 answer
131 views

What you mean by Off-Chain in Ethereum Blockchain? can i use geth as off-chain in DApp?

I have read several articles of off-chain definition and come to know that they are use for scale the ethereum blockchain. but my question is what is actually mean by off-chain word in ethereum ...
Mahesh Rajput's user avatar
2 votes
2 answers
256 views

Is there a way to deal with desistance in a off-chain game?

Suppose I want to use blockchain to play chess for money. So, I can register, on the blockchain, a smart contract (a chess game) associated to some amount of ether. If someone wants to join, he or she ...
Tiago Nascimento's user avatar
7 votes
2 answers
2k views

Offchain vs Sidechain vs StateChannel

What are the main differences between off-chain, sidechain and state channel? And what are the use-cases of all of these?
Meet Siraja's user avatar