Celestia Mainnet: First Blobs

Celestia mainnet launched on October 31, 2023. Around 4pm CET, @colludingnode and I submitted files to Celestia as some of the first blobs in the chain’s history. It was a small milestone that marked the blob submission and retrieval flow being used on mainnet for the first time.

I also shared a walkthrough so anyone could submit blobs during launch day and reproduce the same flow on their own node.

What a blob submission represents

• Data packaged as a blob and posted to Celestia.
• A fee-paid transaction that proves the data was made available.
• A verifiable commitment that rollups and apps can reference later.

Tooling used

For the launch-day submissions I used a small tool I built, celestiabox, which wraps the celestia-node RPCs to post file data as blobs. It made it easy to package files, submit them, and get back the commitment data from a running node.

Blobs submitted

Below is the list of blobs we submitted during launch (via celestiabox). Share the blob payloads or transaction identifiers and I will add them here.

Here are some blobs we submitted, their block heights, commitments, and file extensions:

.pdf
Height: 398
Commitment: 8b9fcdcbbe864694fd91f74edbdc7603272780eeb85d94fc3968341873ac7aec

.mp4
Height:  404
Commitment string:  2eb4aaca755699c2b14e4bf2c8a08f93bdbcbf1ad52dec456d2a6c40e4e8e39b

.jpeg
Height:  408
Commitment string:  e17b26622fdce5bb015aa4f5a1e0a4ffae4f5480f201995c185cca513aa19eb1

.pdf
Height:  424
Commitment string:  55fbfd237691cc501d53ad6a5a4922f70cbead1eb61316c55943f0a254c6d3c3

.jpeg
Height:  429
Commitment string:  86713068b39be7ba4afff88c69fa62c8a6cc3f7b7c999395ac64f37391205358

Why it mattered

Seeing the first blobs land on mainnet validated the core flow: applications can publish data, the network can verify availability, and downstream systems can rely on those commitments for execution and settlement. It was a tangible signal that Celestia DA was ready to blob and roll.

Source: https://x.com/dferrersan/status/1719427046663725381