Ethereum Questions, Problems & Solutions : TransWikia.com ~ Page 12

Fatal: Failed to write genesis block: unsupported fork ordering: eip150Block not enabled, but eip155Block enabled at 0 genesis block

I am attempting to launch a private geth chain with the following command:geth --datadir=./test-private-blockchain/ init genesis.jsonI am receiving the following error:Fatal: Failed to write genesis block: unsupported fork...

Asked on 11/15/2021 by Leon Africa

2 answer

What is a blockchain oracle?

What is a blockchain oracle for smart contracts? And why is it needed? I've seen a lot of posts about "how do oracles work", and "what is the oracle...

Asked on 11/15/2021 by Keenan Olsen

1 answer

How can I securely generate a random number in my smart contract?

If I am writing a smart contract for some kind of (gambling) game, how can I generate a random number securely? What are the best practises and security trade-offs to...

Asked on 11/12/2021

20 answer

Error in creating instance of deployed contract using truffle console

I deployed Token and Crowdsale contract in separate migration files. During Migration, there was no error. Migration logs are share: Running migration: 2_deploy_token.js Deploying DappToken... ... 0xc1ed596e0249507186d75f2d42ba1c34e5b72697774baf9a283e0fb422214b70...

Asked on 11/12/2021 by Unha Back

1 answer

Ethereum linking library with contract not working as accepted...returning any state variable returns just the default value

my librarypragma solidity ^0.5.8;library SafeMath { function add(uint256 a,uint256 b) public pure returns (uint256) { return a+b; ...

Asked on 11/12/2021 by kantus jee

1 answer

light node can perform any operation what fast and full sync mode do, exception getTransationreceipt?

I need to send ethereum between wallets or interact with a token on the ethereum network can a light node has a constraint to do that,it can not perform any...

Asked on 11/12/2021 by andrew007

1 answer

Unknown network ganache

Although it compiles successfully truffle migrate --network ganache gives the following error: Unknown network "ganache". See your Truffle configuration file for available networks. I believe I have it wired correctly...

Asked on 11/12/2021 by CloudTech Support

1 answer

Where authorities in PoA are stored?

I am trying to deploy a private ethereum network in my machine using Proof-Of-Authority and geth client.I followed this tutorial but I can't realize where the...

Asked on 11/10/2021 by maroodb

2 answer

Ethereum Smart Contract with Custom Fee and Percentage of the collected Fee Distrusted token holder

I wanted to know is there a possibility to create a smart contract for a token wherein the transaction fee could be overridden with the network fee and the fee...

Asked on 11/10/2021 by Nitin Jagtiani

1 answer

Can I use create2 to deploy minimal proxies in solidity, without using assembly?

Solidity 0.6.2 allows the creation of contracts with the create2 opcode via the new keyword and passing a salt in addition to any args. This is adequate for creating standard...

Asked on 11/10/2021 by Nick Furfaro

1 answer

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