hello, does anyone know if it is possible to extract ETH balance from a third party with a signature?

what do you mean? with a signature, you can directly submit transaction

In solidity?

Either that or a payable function

If you want to send plain ether, fallback is necessary

Ohk, and i assume for normal token like any erc20 token, there is nothing stopping someone from sending tokens to a smart contract.
No receive or payable function required in that case , correct ?

Yep, because balance change is registered in token contract only.

Correct.
Thanks mate👍

it probably means tx will logically fail

I have connected to Metamask ,Rinkeby Test Network

is the code which is wrong

please check your contract carefully, there must be logical failure

are you trying to deploy upgradeable contracts in remix?

well yes

I have deployed Governance.sol , Lottery.sol and Randomness.sol

I dont think so, I recommend hardhat for upgradeable contracts

'cause we need extra helpers like hardhat-upgrades or hardhat-deploy

Ok , https://blog.chain.link/how-to-build-a-blockchain-lottery/

the same code in Remix.

https://remix.ethereum.org/#version=soljson-v0.6.6+commit.6c089d02.js&optimize=false&gist=1bb62664cfad04de04d9dc5d059eb519&evmVersion=null&runs=200

do you have any in-depth tutorial or guide

?

we can find bunch of them in google

https://docs.openzeppelin.com/contracts/4.x/upgradeable

out of interest which one do you think is best option? UUPS or transparent proxy?

transparent proxy like openzepplin upgradeable