Blob (EIP-4844)
A new way for Layer 2s to post data to Ethereum much more cheaply. Data 'blobs' are temporary and cheaper than regular storage.
Example
Arbitrum fees dropping 10-100x after blobs launched, because posting transaction data to Ethereum became much cheaper.
Related Terms
Advanced Concepts
⚙️How It Works
- 1
L2 Bundles Data
Rollup collects transactions into a blob
- 2
Post to L1
Blob posted as a special transaction type
- 3
Temporary Storage
Blobs are available for ~18 days
- 4
Pruned
Old blobs are deleted to save space
📊Key Numbers
128 KB
Blob Size
per blob
10-100x
Fee Reduction
vs calldata
~18 days
Retention
before pruning