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Top Questions

0 votes
1 answer
429 views

Cannot read property 'then' of undefined

0 votes
1 answer
9 views

I have written a smart contract in solidity using remix ide. the contract is deployed but while interacting the contract it is showing error

1 vote
2 answers
278 views

Failed transaction uses up all the gas instead of a small part needed to revert the execution

1 vote
2 answers
262 views

How to start auditing smart contract?

0 votes
0 answers
5 views

MATIC to ETH comparison w.r.t Wei

0 votes
1 answer
16 views

swapTokensForExactETH, execution reverted: null

0 votes
1 answer
175 views

How do I check for empty bytes array?

0 votes
0 answers
10 views

I registered my contract in Chainlink Keepers, function checkUpkeep returns true, however performUpkeep is not executing

0 votes
2 answers
39 views

Encountered an error while attempting to update latest block (error code 1020 on Polygon mainnet)

19 votes
5 answers
24k views

Is there a C# implementation available for Ethereum?

0 votes
1 answer
434 views

Facing UnhandledPromiseRejectionWarning warning message in web3 infura

1 vote
1 answer
198 views

How to enable meta-transactions for Polygon contract

0 votes
1 answer
17 views

Gas optimisation: maximum of two numbers

0 votes
1 answer
298 views

Executing an contract via code and without metamask / link an account to JS code to automatically wirte on Ethereum

0 votes
0 answers
9 views

How to convert 5 ETH worth token to another blockchain wrapped ETH without actually converting tokens to ETH

0 votes
0 answers
17 views

view functions error : Returned values aren't valid, did it run Out of Gas?

0 votes
2 answers
195 views

Pass enum value in mapping

0 votes
1 answer
17 views

Unable to install WalletConnect through npm

0 votes
0 answers
14 views

Hi,I had written the code for voting purpose.Can you guys help me out to write a truffle testing code for this?

1 vote
2 answers
79 views

What is the purpose of ISZERO?

5 votes
1 answer
1k views

What is the logic behind token reflections?

1 vote
0 answers
5 views

How to mock ethereum provider for unit testing of REST API with jest?

1 vote
3 answers
218 views

Decentralized Access Control in permissioned Blockchain

0 votes
0 answers
6 views

Permissioned networks vs Access Control in public networks

0 votes
0 answers
4 views

How to Export public key from Metamask

0 votes
2 answers
12 views

Is there a chart that shows the daily Eth mined vs the amount of Eth burned in the day?

4 votes
3 answers
9k views

connecting geth to web3.js 1.0 via websockets or HTTP

0 votes
1 answer
188 views

"Uncaught ReferenceError: global is not defined” as I tried to call Todolist.deployed() in truffle console

0 votes
2 answers
23 views

Unable to make Re-entrancy attack using solidity code. Ethernaut Openzeppelin

1 vote
0 answers
8 views

Why does solidity's try/catch not catch "call to non-contract address" revertion?

0 votes
2 answers
20 views

insufficient gas funds error on rinkeby infura using brownie

0 votes
1 answer
14 views

Why does the contract owner receive less ETH than has been sent through payable transfer?

1 vote
1 answer
1k views

Why opensea (Wyvern) are using proxy registry?

0 votes
1 answer
665 views

Time Specified calls in Solidity using Oraclize

0 votes
0 answers
5 views

My transaction was dropped and now when I search the transaction on etherscan it says we are unable to locate this transaction hash. Please help

0 votes
1 answer
5 views

What is the site that shows all the tokens I own in my Ethereum 0x... address across all other L2 EVM compatible chains?

2 votes
1 answer
240 views

How do I get access to uPort from a mobile Browser

1 vote
2 answers
1k views

Is there BTCPay Server for Ethereum?

10 votes
4 answers
7k views

How to convert byte array to bytes32 in solidity

0 votes
1 answer
743 views

How to properly write inputs under the multiple transfer (multiTransfer) on the online etherscan form?

0 votes
0 answers
9 views

Question about factory method in ethernaut

0 votes
0 answers
12 views

HELPP!! What is wrong with my mint function?

0 votes
1 answer
174 views

Error while calling createBuyOrder(): API Error 400: ['Expected exchange contract address to match']

0 votes
0 answers
3 views

How to get the contract binary using web3.py?

0 votes
0 answers
7 views

Solidity - Returned values aren't valid, did it run Out of Gas? You might also see this error if you are not using the correct

0 votes
2 answers
210 views

How to get new transactions by addresses?

0 votes
1 answer
11 views

How to set price to NFT token and update that price?

0 votes
1 answer
15 views

NFT marketplace: transfer NFT directly from seller to buyer, or go through the marketplace first?


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