Latest Ethereum ‘Shadow Fork’ Brings Blockchain’s Shanghai Upgrade Closer to Reality

The first set of testing has commenced for the much anticipated Shanghai upgrade, expected in March, that will enable staked ether withdrawals. Some minor glitches were reported.

AccessTimeIconJan 23, 2023 at 2:15 p.m. UTC
Updated Jan 25, 2023 at 3:58 p.m. UTC
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Margaux Nijkerk reports on blockchain protocols with a focus on the Ethereum ecosystem. A graduate of Johns Hopkins and Emory universities, she has a masters in International Affairs & Economics. She holds a very small amount of ETH and other altcoins.

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Join the most important conversation in crypto and Web3 taking place in Austin, Texas, April 26-28.

Ethereum developers said they successfully created a copy of the blockchain – known as a “shadow fork” – to provide a testing environment ahead of a crucial upgrade known as the Shanghai hard fork.

The shadow fork occurred at 10:40 coordinated universal time (5:40 a.m. ET), according to Parithosh Jayathi, DevOps engineer at the Ethereum Foundation.

In the hours since the fork happened, there were some glitches with Ethereum's nodes that use Geth clients, according to Marius Van Der Wijden, a software developer at the Ethereum Foundation. A client is a software that is used by nodes that operate the blockchain, and Geth is Ethereum's most popular client.

Van Der Wijden told CoinDesk that Ethereum developers are working on syncing Geth clients back up with the rest of the network.

In preparation for Shanghai, which will unlock staked ether (ETH) withdrawals, the protocol will be undergoing a series of test forks that copy the data from the main network (mainnet) to a testing environment.

A shadow fork is a smaller test fork that focuses on some of the changes that need to happen before Shanghai eventually occurs on the main protocol. Ethereum used several shadow forks for testing ahead of last year’s big shift to a proof-of-stake network, known as the Merge.

During this latest shadow fork, developers focused on creating a testing environment for staked ETH withdrawals as well as improvements to reduce gas costs.

This shadow fork brings the much anticipated Shanghai upgrade closer to the Ethereum mainnet, expected in March 2023.

The public testnet for Shanghai will also go live in the coming days. Ethereum developers launched a “Shangdong” testnet for Shanghai in November 2022, but deprecated it so that they could start a newer enhanced testnet.


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Margaux Nijkerk reports on blockchain protocols with a focus on the Ethereum ecosystem. A graduate of Johns Hopkins and Emory universities, she has a masters in International Affairs & Economics. She holds a very small amount of ETH and other altcoins.


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Margaux Nijkerk reports on blockchain protocols with a focus on the Ethereum ecosystem. A graduate of Johns Hopkins and Emory universities, she has a masters in International Affairs & Economics. She holds a very small amount of ETH and other altcoins.