EIP-4844, activated in Ethereum's March 2024 Dencun upgrade, introduced blob transactions: a new data type that lets Layer 2 rollups post data to Ethereum at a fraction of the previous cost. By creating a separate fee market for temporary data blobs, proto-danksharding cut L2 transaction fees by up to 10x and laid the groundwork for full danksharding.
Why Did Layer 2 Fees Need Fixing?
Rollups bundle user transactions off-chain. They then post compressed proof data back to Ethereum.
Before EIP-4844, rollups stored this data in calldata. Calldata lives on-chain forever. Every Ethereum node must download and store it.
This permanence is expensive. Rollups competed with DeFi trades, NFT mints, and token transfers for the same block space.
When Ethereum got busy, L2 fees spiked. Users paying $0.10 on a quiet day might pay $2.00 during a surge.
The core problem: rollup data does not need to be permanent. Validators only need it long enough to verify proofs. Storing it forever wastes resources and inflates costs.
How Blob Transactions Work
EIP-4844 solves this with a new transaction type: Type-3 transactions carrying data blobs.
What is a blob?
A blob is a ~128 KB chunk of binary data. It attaches to a transaction but does not enter the EVM execution layer.
Blobs are temporary. Ethereum nodes store them for roughly 18 days, then prune them. This is enough time for anyone to verify rollup proofs.
The separate fee market
Blobs have their own fee market, independent of regular gas. Each Ethereum block targets 3 blobs and allows a maximum of 6.
Blob fees follow EIP-1559 style pricing. When blob demand is low, fees drop near zero. When demand is high, fees rise to manage congestion.
This separation means a DeFi surge on Layer 1 no longer drags up L2 posting costs.
KZG commitments
Each blob includes a KZG polynomial commitment. This is a compact cryptographic proof that the blob data is valid.
KZG commitments let validators confirm blob integrity without reading the full 128 KB. They also prepare Ethereum for data availability sampling in future upgrades.
What Changed After Dencun?
The results were immediate and dramatic.
| Metric | Before EIP-4844 | After EIP-4844 |
|---|---|---|
| L2 data posting method | Calldata (permanent) | Blobs (temporary, ~18 days) |
| Typical L2 swap fee | $0.50 to $2.00 | $0.01 to $0.10 |
| Data cost reduction | Baseline | Up to 10x cheaper |
| Ethereum block capacity | No blob space | 3 target / 6 max blobs per block |
Major rollups saw fees drop within hours. Simple transfers on some L2s fell below $0.01.
Proto-Danksharding vs. Full Danksharding
EIP-4844 is called "proto-danksharding" because it is the first phase of a larger plan.
What proto-danksharding delivers
- Blob transaction format (Type-3)
- Separate blob fee market
- KZG commitment scheme
- Temporary blob storage (~18 days)
What full danksharding will add
- Data availability sampling (DAS): Validators verify data without downloading every blob. This enables far more blobs per block.
- Expanded blob count: The target may grow from 3 to 32 or more blobs per block.
- Peer-to-peer blob distribution: A dedicated networking layer for blob propagation.
Full danksharding could reduce L2 costs by another order of magnitude. Proto-danksharding built the transaction format and commitment scheme that make this possible.
Why Proto-Danksharding Matters for Gasless Networks
Cheaper data posting changes what is economically viable on Layer 2.
Before EIP-4844, subsidizing user gas fees required large treasuries. The math was hard to sustain. Every transaction carried a real calldata cost that someone had to pay.
With blobs, the base cost of posting rollup data approaches zero during low-demand periods. This makes alternative fee models practical.
Status Network takes this further. As a gasless Ethereum Layer 2 built on the Linea zkEVM stack, it removes gas fees entirely for users. Instead of charging per transaction, it funds operations through native yield from bridged assets and fees from ecosystem apps like Orvex.
Proto-danksharding did not create the gasless model. But it made the economics dramatically more favorable. When blob fees are near zero, the yield from productive capital (ETH staked via Lido, stablecoins routed through lending protocols) can cover operational costs more easily.
Spam protection without gas fees requires a different mechanism. Status Network uses Rate Limiting Nullifiers (RLN), a zero-knowledge protocol that replaces gas as the access control layer. Karma, a soulbound reputation token, determines each user's free transaction quota.
The Road Ahead: PeerDAS and Beyond
Ethereum's next data availability upgrade is PeerDAS (Peer Data Availability Sampling). It will let validators confirm blob availability by sampling small portions instead of downloading entire blobs.
PeerDAS enables Ethereum to safely increase the blob target per block. More blobs per block means more rollup throughput at lower cost.
For L2 ecosystems, this creates a compounding effect. Each reduction in data costs expands the design space for new fee models, richer on-chain applications, and social or gaming use cases that require high transaction volumes.
Key Takeaways
- EIP-4844 introduced blob transactions in Ethereum's Dencun upgrade (March 2024).
- Blobs are temporary (~18 days), avoiding permanent calldata storage costs.
- A separate blob fee market decoupled L2 costs from L1 congestion.
- L2 fees dropped up to 10x immediately after activation.
- Proto-danksharding is phase one. Full danksharding with data availability sampling will expand capacity further.
- Lower data costs make alternative models like gasless execution economically viable.
Frequently Asked Questions
What is EIP-4844 in simple terms?
EIP-4844 is an Ethereum upgrade that created blob transactions. Blobs let Layer 2 rollups post data to Ethereum temporarily instead of permanently, cutting fees by up to 10x.
What is the difference between proto-danksharding and full danksharding?
Proto-danksharding introduced the blob format and a separate fee market. Full danksharding will add data availability sampling, allowing far more blobs per block and further reducing L2 costs.
How much did EIP-4844 reduce Layer 2 fees?
Most major rollups saw fee reductions of 5x to 10x. Simple L2 transfers dropped below $0.01 in many cases, down from $0.50 or more.
What are blob transactions on Ethereum?
Blob transactions (Type-3) carry ~128 KB data chunks that attach to blocks but do not enter the EVM. Nodes store blobs for roughly 18 days, then prune them.
What are KZG commitments in EIP-4844?
KZG commitments are cryptographic proofs attached to each blob. They let validators verify blob data integrity without reading the full contents, enabling future data availability sampling.
Does EIP-4844 affect Ethereum Layer 1 gas fees?
No. Blob fees operate in a separate market. L1 transaction gas pricing remains unchanged. The upgrade specifically targets the cost of L2 data posting.
How does proto-danksharding enable gasless Layer 2 networks like Status Network?
By reducing data posting costs near zero, proto-danksharding makes it practical to fund L2 operations through native yield and app fees instead of charging users gas. Status Network uses this approach alongside RLN spam protection.
What comes after EIP-4844 for Ethereum scaling?
The next major step is PeerDAS, which introduces data availability sampling. This will allow Ethereum to safely increase blob capacity per block, further lowering rollup costs and expanding L2 throughput.
