From Morden to Ropsten

Testing a fork

The Spurious Dragon hardfork is scheduled for the approaching week; block 2675000 is probably going to happen Tuesday night (CET). The block quantity for the testnet “Morden” was scheduled at block 1885000. Performing the fork within the check community prior to performing it in the primary community was an vital measure taken within the testing course of to guarantee a easy 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 an alternative of 0, making certain that any transaction legitimate on one chain wouldn’t be legitimate on the opposite.

EIP 161 specifies new EVM guidelines relating to 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 Most important community

All points discovered in the course of the rollout of Spurious Dragon on the check community had been Morden-specific. There are at present no recognized points affecting the Mainnet.

Beginning the brand new “Ropsten” check community

Earlier than the present onerous forks, there have been already discussions about restarting the check community from a brand new genesis block so as to make full syncing less complicated and fewer useful resource intensive. And due to the low problem of the testnet, the problem bomb was already inflicting noticeable will increase in block instances, which might proceed to develop if unaddressed. So the time is now proper to depart Morden behind and begin a brand new check community.

New shoppers will probably be launched that use Ropsten as an alternative of Morden because the default testnet.

Builders who need to get began with Ropsten instantly can obtain the genesis file here, and begin a shopper 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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