Ropsten TTD Announcement

The Ropsten TTD Announcement: A Comprehensive Guide to Preparing for The Merge

As the Ethereum community eagerly awaits the transition to proof-of-stake, the Ropsten testnet has announced its Terminal Total Difficulty (TTD) value, marking a significant step towards The Merge. In this article, we'll delve into the details of the Ropsten TTD announcement, provide a comprehensive guide to preparing for The Merge, and explore the implications of this transition.

Background

The Ropsten testnet has been running on proof-of-work since its inception, but with the upcoming transition to proof-of-stake, the network's TTD value has been artificially set to prevent The Merge from occurring prematurely. The Bellatrix upgrade, which activated on the Ropsten Beacon Chain at slot 24000, has primed the network to run through The Merge. A new TTD value of 50000000000000000 has been chosen to trigger the transition.

Node Operators and Stakers: What You Need to Do

To prepare for The Merge, node operators and stakers must manually update their execution and consensus layer clients to the versions listed below or more recent ones:

Consensus Layer

Execution Layer

Overriding the TTD Value

To activate The Merge at the right time, node operators and stakers must override both their execution and consensus layer clients' TTD value to 50000000000000000. Here are the instructions for doing so with each client:

Execution Layer

• Besu: Add the following line to your TOML configuration file: override-genesis-config=["terminalTotalDifficulty=50000000000000000"] or use the CLI flag --override-genesis-config="terminalTotalDifficulty=50000000000000000"
• Erigon: Use the CLI flag --override.terminaltotaldifficulty=50000000000000000
• Go-Ethereum (geth): Use the CLI flag --override.terminaltotaldifficulty 50000000000000000
• Nethermind: Use the CLI flag --Merge.TerminalTotalDifficulty 50000000000000000

Consensus Layer

• Lighthouse: Use the CLI flag --terminal-total-difficulty-override=50000000000000000
• Lodestar: Use the CLI flag --terminal-total-difficulty-override 50000000000000000
• Nimbus: Use the CLI flag --terminal-total-difficulty-override=50000000000000000
• Prysm: Use the CLI flag --terminal-total-difficulty-override 50000000000000000
• Teku: Use the CLI flag --Xnetwork-total-terminal-difficulty-override=50000000000000000

FAQ

• As a node operator or staker, what should I do?
  • Update your execution and consensus layer clients to the versions listed above or more recent ones.
  • Manually override the TTD value on both your execution and consensus layer clients.
  • Ensure both your execution and consensus layer clients are fully synced before The Merge.
• As an application or tooling developer, what should I do?
  • Ensure your product works as expected through the proof-of-stake transition and in a post-merge context.
  • Run through a complete testing and deployment cycle on Ropsten (or Kiln) and report any issues with tools or dependencies to those projects' maintainers.
• As an Ethereum user or Ether holder, is there anything I need to do?
  • No, the Ethereum mainnet is not affected by this testnet.
• As a miner, is there anything I need to do?
  • No, mining will no longer be possible on the network after The Merge.

Conclusion

The Ropsten TTD announcement marks a significant step towards The Merge, and node operators and stakers must take action to prepare for this transition. By following the instructions outlined in this article, you can ensure a smooth transition to proof-of-stake and be ready for the next steps in the Ethereum roadmap.

Source: https://blog.ethereum.org/en/2022/06/03/ropsten-merge-ttd