EIP-5133: Delaying Difficulty Bomb to mid-September 2022

Delays the difficulty bomb by a further 700000 blocks, to the middle of September 2022.

Metadata

Status: FinalStandards Track: CoreCreated: 2022-06-01

Authors

Tomasz Kajetan Stanczak (@tkstanczak), Eric Marti Haynes (@ericmartihaynes), Josh Klopfenstein (@joshklop), Abhimanyu Nag (@AbhiMan1601)

Links

GitHub page Discussion on Ethereum Magicians

Abstract

Starting with FORK_BLOCK_NUMBER the client will calculate the difficulty based on a fake block number suggesting to the client that the difficulty bomb is adjusting 11,400,000 blocks later than the actual block number.

Motivation

To avoid network degradation due to a premature activation of the difficulty bomb.

Specification

Relax Difficulty with Fake Block Number

For the purposes of calc_difficulty, simply replace the use of block.number, as used in the exponential ice age component, with the formula:

Rationale

The following script predicts the bomb will go off at block 15530314, which is expected to be mined around mid-September.

Precise increases in block times are very difficult to predict (especially after the bomb is noticeable). However, based on past manifestations of the bomb, we can anticipate 0.1s delays by mid-September and 0.6-1.2s delays by early October.

Backwards Compatibility

No known backward compatibility issues.

Security Considerations

Misjudging the effects of the difficulty can mean longer blocktimes than anticipated until a hardfork is released. Wild shifts in difficulty can affect this number severely. Also, gradual changes in blocktimes due to longer-term adjustments in difficulty can affect the timing of difficulty bomb epochs. This affects the usability of the network but unlikely to have security ramifications.

In this specific instance, it is possible that the network hashrate drops considerably before The Merge, which could accelerate the timeline by which the bomb is felt in block times. The offset value chosen aims to take this into account.