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Home Ethereum

From Morden to Ropsten | Ethereum Foundation Blog

n70products by n70products
February 16, 2025
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From Morden to Ropsten | Ethereum Foundation Blog
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Testing a fork

The Spurious Dragon hardfork is scheduled for the approaching week; block 2675000 is prone to happen Tuesday night (CET). The block quantity for the testnet “Morden” was scheduled at block 1885000. Performing the fork within the take a look at community previous to performing it in the primary community was an necessary measure taken within the testing course of to make sure a clean rollover into the post-fork state.

The Morden fork occurred on Nov-20-2016, 06:12:20 +UTC, at block 1885000 as deliberate.  A bit later, at block 1885074, there was a consensus challenge between Geth and Parity.

Morden replay safety

The Morden testnet has been working because the launch of the Ethereum blockchain (July 2015). At the moment, issues about replay-attacks between Morden and Mainnet had been addressed by utilizing a nonce-offset. All accounts on Morden used a beginning nonce of 2^20 as a substitute of 0, making certain that any transaction legitimate on one chain wouldn’t be legitimate on the opposite.

EIP 161 specifies new EVM guidelines concerning nonces. The implementation of these guidelines, together with Morden-specific nonce-rules, resulted in Geth and Parity creating incompatible blocks at block 1885074.

Penalties for the Essential community

All points discovered through the rollout of Spurious Dragon on the take a look at community had been Morden-specific. There are at the moment no identified points affecting the Mainnet.

Beginning the brand new “Ropsten” take a look at community

Earlier than the present exhausting forks, there have been already discussions about restarting the take a look at community from a brand new genesis block with a purpose to make full syncing easier and fewer useful resource intensive. And because of the low problem of the testnet, the problem bomb was already inflicting noticeable will increase in block occasions, which might proceed to develop if unaddressed. So the time is now proper to depart Morden behind and begin a brand new take a look at community.

New shoppers might be launched that use Ropsten as a substitute of Morden because the default testnet.

Builders who need to get began with Ropsten instantly can obtain the genesis file here, and begin a consumer with the Ropsten community id:3

  • geth: geth –datadir /path/to/testnet/information init genesis.json; geth –datadir /path/to/testnet/information –networkid 3 console
  • parity: Obtain ropsten.json, then parity –chain path/to/ropsten.json



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Tags: BlogEthereumFoundationMordenRopsten
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