Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

add l2_blob_tx.md #2

Open
wants to merge 3 commits into
base: main
Choose a base branch
from
Open

add l2_blob_tx.md #2

Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
c3139f1
add l2_blob_tx.md
blockchaindevsh Jul 21, 2024
007c480
fix for review
blockchaindevsh Jul 23, 2024
1c3f725
mod motivation
blockchaindevsh Aug 6, 2024
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
47 changes: 47 additions & 0 deletions specs/experimental/l2_blob_tx.md
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,47 @@
<!-- omit in toc -->
# L2 Blob Transaction

<!-- START doctoc generated TOC please keep comment here to allow auto update -->
<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
**Table of Contents**

- [Motivation](#motivation)
- [How It Works](#how-it-works)
- [Reference Implementation](#reference-implementation)

<!-- END doctoc generated TOC please keep comment here to allow auto update -->

## Motivation

The proposal aims to integrate BLOB transaction support into the OP Stack. BLOB transactions are gaining popularity on Layer 1 (L1), with applications including BLOB inscriptions, Rollups (as an optional feature), and EthStorage. However, none of the L2s (including OP Stack) supports BLOB transactions, resulting in high migration costs for these projects. To harvest the reduced gas costs of L2s with minimized migration costs of applications using BLOB transactions, it is of great value in OP Stack to support L2 BLOB transactions.
Copy link

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Can there be more specific projects or user scenarios here? Why does L2 support Blob transactions? This motivation does not seem to be a high demand.


To further reduce the DA cost of L2 BLOB transactions of OP Stack, the proposal offers a hybrid DA solution, where the L2 BLOBs may use a different DA (e.g., DA committee or DA challenge) as that of L2 calldata (generally L1 DA). This better serves the applications with demands on different data values with lower costs:
- For transactions with high-value data (e.g., swap in Uniswap), the users can use non-BLOB L2 transactions.
Copy link

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

If user use non-BLOB L2 transactions, how it can be the option of To further reduce the DA cost of L2 BLOB transactions

Copy link

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

As I understand it, the proposal suggests using an alternative data availability (DA) solution for L2 BLOB transactions instead of Ethereum’s native DA to further reduce the cost of these transactions.

- For transactions with low-value data (e.g., NFT images/inscriptions), the users can use BLOB L2 transactions at a lower cost.

Copy link

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Overview of Implementation

Derivation

Depending on L2 BLOB DA configuration:

  • Sequencer-self-hosted: Skip actual L2 BLOB data during derivation
  • DAC: Verify the DAC signatures during derivation
  • L1 DA: Decode and verify L2 BLOB from L1 BLOB during derivation
  • DA challenge (Plasma): Check L1 challenge contract to see if a BLOB is challenged during derivation

BLOB Gas Cost

What is the formula of L2 BLOB gas cost?

BLOB P2P Network

Compared to L1 BLOB processing in P2P network, what we have done?

Other Minor Changes

...

## How It Works

The proposed changes are implemented across two repositories: `optimism` and `op-geth`.

Changes in the `optimism` repository::
1. Addition of `L2BlobConfig` field to `rollup.Config` to enable L2 BLOB transaction support and optional BLOB storage to a Data Availability (DA) [provider]((https://github.com/ethstorage/da-server)) by the sequencer.
- Several modifications to facilitate L2 BLOB transactions in OP Stack:
- [`BuildBlocksValidator`](https://github.com/blockchaindevsh/optimism/blob/106fbfd5d45efa45d6580cf169a5e053e406b933/op-node/p2p/gossip.go#L250) updated to support non-zero `BlobGasUsed` and `ExcessBlobGas`.
- Introduction of [`spanBatchBlobTxData`](https://github.com/blockchaindevsh/optimism/blob/106fbfd5d45efa45d6580cf169a5e053e406b933/op-node/rollup/derive/span_batch_tx.go#L49) for BLOB transaction support in span batch.
- [`CheckBlockHash`](https://github.com/blockchaindevsh/optimism/blob/106fbfd5d45efa45d6580cf169a5e053e406b933/op-service/eth/types.go#L218) modified to enable broadcasting blocks with BLOB transactions.
- [`SimpleTxManager.craftTx`](https://github.com/blockchaindevsh/optimism/blob/106fbfd5d45efa45d6580cf169a5e053e406b933/op-service/txmgr/txmgr.go#L252) updated to accommodate BLOB transactions.
- [Addition]((https://github.com/ethereum-optimism/optimism/pull/11011)) of `p2p.sync.onlyreqtostatic` flag is to allow fetching blocks exclusively from static peers.
2. Implementation of a challenge mechanism for BLOB transactions is planned, as only BLOB hashes are submitted to L1 by op-batcher.


Changes in the `op-geth` repository:
1. Addition of `EnableL2Blob` field to `OptimismConfig` to enable L2 BLOB transaction support.
2. Inclusion of `blobs` field to `RollupCostData` and update of [`newL1CostFuncEcotone`](https://github.com/blockchaindevsh/op-geth/blob/19971ab7ffd0b6879796daf8c05b3206e279f15d/core/types/rollup_cost.go#L191) to introduce additional DA fees for BLOB transactions.
3. Correction of [`Transaction.RollupCostData`](https://github.com/blockchaindevsh/op-geth/blob/19971ab7ffd0b6879796daf8c05b3206e279f15d/core/types/transaction.go#L374) to ensure consistent results when called from worker and state processor.
4. Modification of [`commitBlobTransaction`](https://github.com/blockchaindevsh/op-geth/blob/19971ab7ffd0b6879796daf8c05b3206e279f15d/miner/worker.go#L806) to support BLOB transactions without blobs during derivation.
5. Integration of upstream geth changes to support gas estimation for BLOB transactions.

## Reference Implementation

1. [optimism repo changes](https://github.com/ethstorage/optimism/pull/23)
2. [op-geth repo changes](https://github.com/ethstorage/op-geth/pull/2)