EIP-4844 introduces blob transactions (Type 3) as part of Proto-Danksharding. Sending blob transactions in practice comes with constraints around tooling, RPC support, and transaction preparation.
This article summarizes hands-on experimentation with ethers.js v6 and kzg-wasm, focusing on what works, what does not, and how to get a minimal setup running.
If you just want to create a blob without diving into code, https://blobsender.xyz lets anyone write a message and submit it as a blob on Ethereum.
Current limitations
Browser wallets and connectors do not support blob transactions yet.
They must be sent from a backend or script controlling a private key directly.RPC support is inconsistent.
Even on Sepolia, many public RPC endpoints reject blob transactions or do not support EIP-4844.
RPC support on Sepolia
RPC support was one of the main friction points. About 20 Sepolia RPC providers were tested. Many rejected blob transactions or lacked EIP-4844 support.
The following public RPC endpoints worked reliably:
https://sepolia.infura.io/v3/YOUR_API_KEY
https://ethereum-sepolia-rpc.publicnode.com
https://eth-sepolia.api.onfinality.io/public
https://0xrpc.io/sep
https://sepolia.drpc.org
This list is included in the repository to save others testing time.
Repository and code
All working examples live here:
https://github.com/0xKurt/eip-4844-ethers-examples
The repository contains two scripts:
- send-blob.ts – a simple blob transaction
- send-blob-contract.ts – a blob transaction combined with a contract call
Both use ethers.js v6 and kzg-wasm, and send Type 3 transactions.
At a high level, sending a blob transaction requires preparing a fixed-size blob, generating a KZG commitment and proof, and sending a transaction with type: 3.
Blobscan
Blobscan allows inspection of:
- blob versioned hashes
- blob gas prices
- other blob-related metadata
The scripts print direct links to Blobscan using the blob versioned hash returned by ethers, making verification and inspection easy.
Full walkthrough
This post is a condensed summary. A complete step-by-step walkthrough of setup, code, and transaction flow is available in the original Medium article:
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