Community Digest

Top new questions this week:

Finalized blocks with 0 transactions and 0 block reward

This block was finalized 21 mins ago from now and there is one exactly like this waiting to get finalized Here is the link of that. Both of them had 0 transaction, 0 block reward, 0 extra data, 0 gas ...

etherscan mining gas-price  
user avatar asked by RV12 Score of 3
user avatar answered by Ramon Royo Score of 0

How to find if a block is finalized

Is there a simple way to find out if a given block is finalized in PoS Ethereum? Currently, I'm calling the endpoint ../eth/v1/beacon/states/finalized/finality_checkpoints of the Beacon Node and it ...

proof-of-stake explorer-api beacon-nodes finality epoch  
user avatar asked by Majd TL Score of 2
user avatar answered by Majd TL Score of 1

Multiplying fixed-point types in Solidity

I would like to define a function like this: function convert(ufixed x) external pure returns (uint256 result) { result = x * 1e18; } Unfortunately, the code above does not compile: TypeError: ...

solidity solidity-0.8.x fixed-point  
user avatar asked by Paul Razvan Berg Score of 2
user avatar answered by Jeremy Then Score of 1

Why does a wallet have to connect to a node?

I understand all wallets must connect to some kind of node that exposes JSON-RPC, either a publicly run Node as a Service, or run by yourself. My question is, why can't you post transactions to the ...

wallets nodes  
user avatar asked by f.khantsis Score of 2
user avatar answered by Ad-h0c Score of 2

Where is the image/video stored in an NFT?

Just get started on Solidity, and it doesn't seem like the image/video is embedded directly into the contract. Where are those assets stored in fact? Perhaps the approach varies among markets, it ...

solidity nft  
user avatar asked by Urology2103 Score of 2
user avatar answered by eszymi Score of 3

How to use nonce to prevent signature replication?

I would like to verify that a message is sent by a certain address, and to get the signer address I use the following function: function VerifyMessage(bytes32 _hashedMessage, uint8 _v, bytes32 _r, ...

solidity signature nonce  
user avatar asked by Ahmet Yazıcı Score of 2
user avatar answered by 0xSanson Score of 2

What information can I get from a hash?

Say i have a hash - I think sha256/keccak: 90ad6dec4ce7167e92c7a7122232d48a1fd5e6c5e81cb3f45c147424b6728437 What do i do with it? Is there something on etherscan that can decipher it or show what it ...

etherscan hash cryptography keccak  
user avatar asked by LazyOctopus Score of 2
user avatar answered by Jeremy Then Score of 2

Greatest hits from previous weeks:

What's the difference between proof of stake and proof of work?

The Ethereum frontier network currently uses a proof of work (PoW) consensus algorithm, while a future version of the network plans to utilise a proof of stake (PoS) algorithm instead. What's the ...

proof-of-stake consensus proof-of-work  
user avatar asked by Jeff Coleman Score of 72
user avatar answered by Jeff Coleman Score of 31

Module not found: Error: Can't resolve 'stream' in React project including web3

When I include web3 in a project I am getting node compile errors like this... ERROR in ./node_modules/cipher-base/index.js 3:16-43 Module not found: Error: Can't resolve 'stream' in '/Users/xxx/dev/...

web3js nodejs react  
user avatar asked by Simon Score of 3
user avatar answered by Patrick Rutherford Score of 8

How to mine Ether on GNU + Linux?

How do we start mining Ether on a Debian / Ubuntu / GNU+Linux based computer? Are there PPAs or special repositories?

mining linux repositories ppa  
user avatar asked by user75798 Score of 36
user avatar answered by meebey Score of 13

How to get private key from account address and password?

What I have 1. I am able to create new account with personal.newAccount() method of web3 api. 2. I am working on my private blockchain. 3. geth node start with following command:- geth --datadir ~/...

go-ethereum web3js ethereum-wallet-dapp ethereumjs  
user avatar asked by Imroz Score of 33
user avatar answered by Mounir Atouil Score of 22

How to backup mist wallets?

I know I can backup the keystore files from my running ethereum client which holds my accounts. But how can I backup wallets created with mist? Is it enough to write down the public address where the ...

accounts wallets addresses keystore backup  
user avatar asked by q9f Score of 44

How to check my sync status on Geth 1.5.5, Raspberry Pi 3

Have a Geth 1.5.5 node running on a raspberry pi 3. When I type in sudo systemctl status geth I'll get ever changing time and block information. Neat, but how do I know when I am synced up? Is ...

go-ethereum synchronization raspberry-pi  
user avatar asked by Arthur D. Howland Score of 42
user avatar answered by Arthur D. Howland Score of 59

I have two Metamask accounts with the same password and seed phrase. How is this possible?

So after doing a 'system restore' on my Ol' Faithful laptop, and reinstalling Chrome, my MMask extension was no longer there. Thankfully it's on mobile and I have the seed-phrase. The probs started ...

metamask wallets dapps browsers  
user avatar asked by gIII Score of 6
user avatar answered by Richard Horrocks Score of 12

Can you answer these questions?

User Defined Value Types

In documentation : // SPDX-License-Identifier: GPL-3.0 pragma solidity ^0.8.8; // Represent a 18 decimal, 256 bit wide fixed point type // using a user defined value type. type UFixed is uint256; ///...

user avatar asked by H.Okan Score of 1
user avatar answered by Jeremy Then Score of 0

Is it possible to create a smart contract that recieve a specific BEP20 token from an address, and send it back same amount of an ERC20 token?

Is it possible to create a smart contract that receive a specific BEP20 token named X, from a wallet address, and send it back the same amount of a specific ERC20 token named Y ? of course the smart ...

solidity web3js blockchain erc-20 tokens  
user avatar asked by Mary Score of 1
user avatar answered by Jeremy Then Score of 0

How the get all ETH state changes

I am writting a data aggregator for DeFi exchanges and I need to collect all historic state changes that occur in certain smart contracts of interest. I suppose one way to do it would be to do a fresh ...

user avatar asked by weaver Score of 1
user avatar answered by mortimr Score of 0
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