The ‘London’ hardfork of Ethereum is slated to go live on testnets on June 24.

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The London hard fork, a critical step towards complete mainnet deployment, has now been scheduled for three Ethereum testnets.

The much-anticipated “London” Ethereum hard fork now has a defined block height for three testnets – a critical last step before launching the entire mainnet.

Ethereum core engineer Tim Beiko stated in a blog post on the Ethereum Foundation’s website that the Ropsten, Goerli, and Rinkeby testnets now have fixed block heights at which London will go live, with Ropsten anticipated to be the first at block 10,499,401, or sometime on June 24. Goerli is scheduled to arrive on June 30, followed by Rinkeby on July 7.

A release schedule for the all-important mainnet upgrade is still being determined, however.

“As of now, only the testnets (Ropsten, Goerli, Rinkeby) have been scheduled for London. Once the upgrade has successfully been activated on these networks, a block will be set for the Ethereum mainnet and be communicated on this blog and in other venues,” Beiko wrote.

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The London hard fork update contains five ETH Improvement Proposal (EIP) improvements, but EIP-1559 is the main attraction. EIP-1559, an update of ETH’s present price system, is projected to drastically cut gas costs for users. However, it may reduce miner income by up to 50%, prompting some grumblings about a “miner revolt” that has mostly failed to materialise.

The update is regarded as one of several positive catalysts on the horizon for Ethereum, not the least of which being the Ethereum 2.0 upgrade. Eth2 will migrate the network to a more scalable proof-of-stake consensus method, reducing the energy consumption of validation blocks substantially.

“The decentralized nature of blockchain systems makes a network upgrade more difficult. Network upgrades in a blockchain require cooperation and communication with the community, as well as with the developers of the various Ethereum clients in order for the transition to go smoothly.”

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