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ETH Validator Withdrawals Are One Step Closer as Testnet Goes Live

2 mins
Updated by Ryan Boltman
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In Brief

  • Ethereum's Zheijang testnet will launch on Feb. 1, 2023 to pave the way for testing withdrawals of staked ETH and several other performance-related improvements.
  • According to developers, the testnet will precede the Shanghai and Capella forks that will actually enable the new features.
  • The testnet launch is preceded by a mainnet shadow fork, announced last week, as developers plan to complete the Shanghai mainnet upgrade in March 2023.
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According to Ethereum developer Barnabas Busa, the Ethereum Zheijang public withdrawal testnet will go live on Feb. 1, 2023, at 15:00 UTC as a precursor to the upcoming Shanghai upgrade planned for March 2023.

According to Busa, the testnet will set the stage for the Shanghai and Capella forks that will allow validators to make full withdrawals using the Lodestar, Lighthouse, Teku, Prysm, and Nimbus consensus clients, as well as the Besu, Geth, Nethermind, EthereumJS, and Erigon execution layer clients. The Shanghai and Capella forks will be triggered six days after the testnet launch at epoch 1350.

ETH Validators Can Test Full or Partial Withdrawals

After the forks, partial withdrawals will automatically be triggered on all validator addresses with a 0x01 execution address on all clients. Those using legacy BLS credentials (0x00) can update them to execution addresses using a tool called ethdo. Validators can exit the testnet after completing full or partial withdrawals. 

Ethereum migrated from a proof-of-work consensus mechanism to a proof-of-stake consensus mechanism on Sep. 15, 2022. The upgrade, dubbed the Merge, uses validators rather than miners to secure the network. 

Aspiring validators could lock 32 ETH in a staking contract on Ethereum’s Beacon chain to activate Ethereum validator software. In return, they would earn a yield on their ETH. Those who could not stake 32 ETH could lock fewer ETH in liquid staking pools and receive a corresponding liquidity token with the same value as ETH to use on other decentralized finance applications. 

The upcoming Shanghai upgrade will, among other things, enable over 500,000 validators to withdraw 16,279,913 staked ETH.

Zheijang Testnet to Trial Performance Improvements

In addition to withdrawals, the Zheijang testnet will trial Warm COINBASE, PUSH0, and Limit/meter initcode improvements.

An Ethereum testnet is a blockchain testing network miming the main Ethereum blockchain post-Merge. Developers can test applications on testnets without risking real money. 

Payments to Coinbase addresses incur high gas fees because the Coinbase address is not part of an access list framework, first proposed in Ethereum Improvement Proposal (EIP) 2929. EIP-3651, Warm COINBASE, reduces gas fees by loading a coinbase address at the start of the transaction’s validation. 

EIP-3855, or PUSH0, will lower the gas fees of some Ethereum operations by creating a new command, while Limit/meter initcode will extend EIP-170 to limit the size of smart contract calldata.

The testnet announcement comes one week after Ethereum developer Marius Van Der Wijden announced the first mainnet shadow fork before the Shanghai upgrade on the Ethereum mainnet.

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David Thomas
David Thomas graduated from the University of Kwa-Zulu Natal in Durban, South Africa, with an Honors degree in electronic engineering. He worked as an engineer for eight years, developing software for industrial processes at South African automation specialist Autotronix (Pty) Ltd., mining control systems for AngloGold Ashanti, and consumer products at Inhep Digital Security, a domestic security company wholly owned by Swedish conglomerate Assa Abloy. He has experience writing software in C...
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