Ethereum developers implement a shadow fork of the Shanghai upgrade

The Ethereum team has successfully implemented a shadow fork of Shanghai to test the impact of the planned upgrade on the mainnet. This was reported by Geth client developer Marius van der Wijden.

Withdrawal-Mainnet-Shadow-Fork-1 is finalizing 🚀🚀🚀

It started out with a few issues because the config wasn’t correctly applied on geth (we disallow overriding the mainnet config). The config is applied correctly and all nodes are in agreement. We will start some evil nodes,.

— MariusVanDerWijden (@vdWijden) January 23, 2023

According to him, during testing there were several issues due to an incorrect Geth configuration. After fixes, all nodes began operating in consensus.

Van der Wijden, together with a colleague, launched several malicious nodes to test the resilience of both the execution and the consensus layers.

“These nodes are trying to spam the network with invalid blocks and messages. Finalization in the chain is currently proceeding correctly. Let’s see if Potuz and I can break it,” the developer wrote.

Both on the execution layer and the consensus layer. These nodes will try to spam invalid blocks/messages.

For now the chain is finalizing correctly, lets see if Potuz and I can break it 😉

— MariusVanDerWijden (@vdWijden) January 23, 2023

In early December, the Ethereum team named March 2023 as the tentative timeframe for the Shanghai hard fork on the mainnet. The update includes a set of network improvement proposals. Among them is EIP-4895, whose implementation will allow withdrawals of ETH from the Beacon Chain staking contract.

In November, developers launched devnet with the aim of testing the withdrawal function by cryptocurrency validators from the deposit contract.

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