EIP-7639: eth/70 - Cease serving history before PoS
Execution layer clients will no longer serve block data before Paris over p2p.
| Authors | lightclient (@lightclient) |
|---|---|
| Created | 2024-02-13 |
| Discussion Link | https://ethereum-magicians.org/t/cease-serving-history-before-pos/18991 |
Table of Contents
Abstract
Execution layer clients will no longer request or respond to p2p queries about block data before the Paris upgrade.
Motivation
As of 2024, historical data in clients has grown to around 500 GB. Nearly 400 GB of that is from block data before PoS was activated in the Paris upgrade. Long term, Ethereum plans to bound the amount of data nodes must store. This EIP proposes the first steps to achieve such goal.
Specification
Add a new eth protocol capability with version 70.
Clients connected on this version must not make or respond to p2p queries about block bodies or receipts before block 15537393.
The affected protocol messages are:
GetBlockBodies (0x05)BlockBodies (0x06)GetReceipts (0x0f)Receipts (0x10)
Rationale
Only Pre-PoS data
One might ask why the distinction between pre and post PoS data is made in this EIP. The simple answer is that the at the moment of the merge, the block structure changed substantially. Although execution layer client software today continues on with block data on disk which remains similar to per-PoS data, the beacon chain is now the canonical chain definition. Therefore, a beacon block can be used to both record historical data for execution layer and beacon layer.
Over the long term, the distinctions of “execution layer” and “consensus layer” may matter less. This EIP tries to be agnostic to client architecture and instead focuses on the shape of the data.
Backwards Compatibility
After this EIP is activated, nodes will no longer be able to full sync from the devp2p network. To continue doing so, they must retrieve the data out-of-band.
Security Considerations
TODO
Copyright
Copyright and related rights waived via CC0.
Citation
Please cite this document as:
lightclient (@lightclient), "EIP-7639: eth/70 - Cease serving history before PoS [DRAFT]," Ethereum Improvement Proposals, no. 7639, February 2024. [Online serial]. Available: https://eips.ethereum.org/EIPS/eip-7639.