Ethereum Questions, Problems & Solutions : TransWikia.com ~ Page 20

What storage is assigned to mappings in solidity?

I based some code on this - https://solidity.readthedocs.io/en/develop/types.html When I run the code below -pragma solidity ^0.4.18;contract CA2 { mapping (uint => Student) public students;...

Asked on 02/27/2021 by Trevor Lee Oakley

1 answer

Metamask not allowing any transaction by code

I am building an application using ethereum smart contracts. I am using Metamask Chrome extension to run my application on Chrome. But I am facing a little issue. When I...

Asked on 02/26/2021 by Shoaib Iqbal

1 answer

The blockchain trilemma

I understand that the generic blockchain faces a problem where it can choose to optimize between scalability, security and decentralization. I can see easily why scalability and decentralization are at...

Asked on 02/26/2021

1 answer

Oracle service and oracle smart contract

I read this article https://medium.com/@robinagist/building-an-ethereum-oracle-with-web3-js-1-0-1272b59cfc31 but there are some things I didn't understand. Does the oracle need a node (like geth or parity) to communicate with the...

Asked on 02/23/2021 by Mario Roma

0 answer

History of Ethereum

My son is writing a school project on the history of Ethereum and there are a few questions that he has that we've been unable to find online. I...

Asked on 02/22/2021 by Phil Boltt

1 answer

Transferring an ERC-20 using web3js 1.0.0

I have been trying to follow the web3js documentation, but it mentions things that are not native to Javascript like "Buffer" so I found a library called ethereumjs-tx to let...

Asked on 02/21/2021 by John Murphy

1 answer

Does Parity sync in the background task or does browser have to be open?

Does the Parity Wallet sync when background task is running, or do you have to keep the browser window open? I'm a couple of 100K behind, and I thought...

Asked on 02/21/2021 by NealWalters

1 answer

What would an Etheruem-like blockchain look like if each block were just an IPFS hash?

I see a lot of people tout the enormous benefits of using IPFS as a store of data. Meanwhile, the Ethereum blockchain is over 1TB in size, with quesitonable need...

Asked on 02/17/2021 by nick carraway

1 answer

web3.eth.Contract with Web3 1.3.0 does not seem to work

I'm able to create an instance of a smart contract that I know works in Ganache using Truffle. But in my Javascript Nodejs app, with the syntax "let contractInstance...

Asked on 02/16/2021

1 answer

Solidity: How to do 2D mapping?/Syntax Error

I am getting a syntax error. I am not sure if its a problem related to 2D mapping or 2D array. My code is given below:contract Stealing{ ...

Asked on 02/14/2021

1 answer

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