Ethereum Questions, Problems & Solutions : TransWikia.com ~ Page 13

unable to see the first address using web3.eth.getAddress()

I tried to see all address using web3.eth.getAccounts() It's run perfectly. Next I tried to see the first address using web3.eth.getAccounts().then(function(accounts) {return accounts[0]}) It's also worked well. But now I...

Asked on 11/10/2021 by tithidey

1 answer

How to update multiple values in a mapping without a loop?

if you have a mapping like:mapping (uint => bool) owned;How would you go through and update 1000 items in that mapping to set them all to true? Without using...

Asked on 11/10/2021

0 answer

How to reliably send transaction via web3j while connection is poor?

I use Transfer.sendFunds(Web3j, Credentials, BigDecimal, Convert.Unit) to transfer money. Usually I convert it to flowable. Flowable/RemoteCall completes when transaction is included in block (correct me if I am wrong)....

Asked on 11/10/2021 by Roman Chumachenko

1 answer

How to check validity of an address in solidity?

Here's a simple contract:contract C { event myEvent(bool x, address y); address someAddress; function someAddressExist(){ ...

Asked on 11/07/2021 by manidos

2 answer

Ethereum classic wallet is zero

I logged onto my ethereum classic wallet and the balance is zero. This is absolutely wrong. What do I need to do....

Asked on 11/07/2021 by Rhiannon Oaks

1 answer

How to dynamically load contracts data with their ABI from etherscan API?

Im wanting to pull data from a smart contract I've loaded via user address and etherscan API for the ABI. But how would I go about programmatically adding all...

Asked on 11/07/2021

3 answer

Balance may be outdated, Metamask

Metamask is showing an asterisk near the account balance, and the message "Balance may be outdated". Indeed the balance is outdated. This is true on all networks (Main, Ropsten, etc.)...

Asked on 11/07/2021

4 answer

Ethereum was withdrawn from my wallet to the wrong address

Ethereum was withdrawn from my wallet to the wrong address. I am using metamask and decentralized wallet application.The keystore file is stored in Apple could storage.Mnemonic did not use or...

Asked on 11/07/2021

0 answer

How does array.length-- work?

I'm having trouble understanding why people callarray.length--after deleting an element in an array (as seen in this answer and many others). Why is there need for doing so?...

Asked on 11/07/2021 by Alejandro Veintimilla

1 answer

Why are some transactions lost during mining?

I open mine in my own private chain, and I submit the transaction at the same time. Some of the transactions do not trade hashing, and then the fair is...

Asked on 11/04/2021 by J.JACK

1 answer

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