Safety Alert: Ethereum Constantinople Postponement

The Ethereum Core Builders and the Ethereum Safety Neighborhood have been made conscious of the potential Constantinople-related points recognized by ChainSecurity on January 15, 2019. We're investigating any potential vulnerabilities and can observe with updates on this weblog submit and throughout social media channels.

Out of an abundance of warning, key stakeholders across the Ethereum group have decided that one of the best plan of action will likely be to delay the deliberate Constantinople fork that might have occurred at block 7,080,000 on January 16, 2019.

This may require anybody working a node (node operators, exchanges, miners, pockets providers, and many others…) to replace to a brand new model of Geth or Parity earlier than block 7,080,000. Block 7,080,000 will happen in roughly 32 hours from the time of this publishing or at roughly January 16, 8:00pm PT / January 16, 11:00pm ET / January 17, 4:00am GMT.

What You Want To Do

If you're an individual who merely interacts with Ethereum (you don't run a node), you do not want to do something.

Miners, Exchanges, Node Operators:

  • Replace your Geth and/or Parity situations when they're launched.

  • These releases will not be launched but. We'll replace this submit when they're out there.

  • Hyperlinks and model numbers and directions will likely be supplied right here when they're out there.

  • We anticipate to have up to date releases in 3-Four hours from the time this weblog is printed.


  • Improve to 1.8.21 , OR

  • Downgrade to Geth 1.8.19, OR

  • Stay on 1.8.20, however use the swap ‘–override.constantinople=9999999’ to postpone the Constantinople fork indefinitely.


Everybody Else:

Ledger, Trezor, Protected-T, Parity Signer, WallEth, Paper Wallets, MyCrypto, MyEtherWallet and different customers or token holders that don't take part within the community by syncing and working a node.

  • You shouldn't have to do something.

Contract homeowners

  • You shouldn't have to do something.

  • You might select to look at the evaluation of the potential vulnerability and test your contracts.

  • Nevertheless, you shouldn't have to do something because the change that might introduce this potential vulnerability is not going to be enabled.


The article by ChainSecurity dives deep into the potential vulnerability and the way sensible contracts could be checked for the vulnerability. Very briefly:

  • EIP-1283 introduces cheaper gasoline value for SSTORE operations

  • Some sensible contracts (which are already on chain) might make the most of code patterns that might make them weak to a re-entrancy assault after the Constantinople improve befell

  • These sensible contracts wouldn't have been weak earlier than the Constantinople improve

Contracts that enhance their likelihood to being weak are contracts that make the most of a switch() or ship() perform adopted by a state-changing operation. An instance of such a contract can be one the place two events collectively obtain funds, determine on tips on how to break up mentioned funds, and provoke a payout of these funds.

How was the choice to postpone the Constantinople fork was made

Safety researchers like ChainSecurity and TrailOfBits ran (and are nonetheless working) evaluation throughout the complete blockchain. They didn't discover any circumstances of this vulnerability within the wild. Nevertheless, there's nonetheless a non-zero danger that some contracts may very well be affected.

As a result of the chance is non-zero and the period of time required to find out the chance with confidence is longer the period of time out there earlier than the deliberate Constantinople improve, a choice was reached to postpone the fork out of an abundance of warning.

Events concerned within the discussions included, however weren't restricted to:

Response Time

3:09am PT

  • ChainSecurity responsibly discloses doubtlessly vulnerability by way of Ethereum Basis’s bug bounty program

8:09am PT

  • Ethereum Basis asks ChainSecurity to publicly disclose

8:11am PT

  • Authentic article by ChainSecurity is printed

8:52am PT

  • Martin Holst Swende posts in ethsecurity and AllCoreDevs Gitter channel: “Please learn: @/all We want a fast resolution on potential penalties and tips on how to transfer ahead. We've got about 37 hours left till the fork occurs”

8:52am PT – 10:15am PT

  • Dialogue happens throughout varied channels concerning potential dangers, on-chain evaluation, and what steps must be taken

10:15am PT – 12:40pm PT

  • Dialogue by way of Zoom audio name with key stakeholders. Dialogue continues in gitter and different channels as properly

12:08pm PT

  • Determination made to delay Constantinople improve

1:30pm PT

  • Public weblog submit launched throughout varied channels and social media

This text was put collectively in a collaborative effort by EvanVanNess, Infura, MyCrypto, Parity, Standing, The Ethereum Basis, and the Ethereum Cat Herders.

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