Celestia Activates Fibre on Mainnet for Direct Rollup Uploads to Validators

Celestia has activated Fibre on mainnet with its v10 upgrade, giving rollups a direct path to upload large blobs to validator-run servers. The initial release caps blobs at 128 MiB and 200 submissions per block, well below the protocol's 3.07 Tb/s test benchmark.

Rollups on Celestia can now upload large blobs of data directly to validators, bypassing the network's standard data availability path, after the project activated its Fibre data publishing protocol on mainnet. The launch was reported on October 20.

Fibre went live with Celestia's v10 network upgrade, under which each bonded validator is expected to run a Fibre server. A network status notice posted October 14 shows Celestia told validators ahead of the upgrade to set up those servers on separate machines from their validator nodes.

How it works

Clients upload erasure-coded blob shards to Fibre servers operated by validators, and download data from them. Erasure coding lets readers rebuild a full blob from partial pieces. Each server's storage budget is set by the stake of its associated validator.

Celestia's consensus layer records only payment information, blob commitments and validator signatures. The project says this design allows higher throughput.

Launch limits

The initial release supports blobs of up to 128 MiB and up to 200 Fibre submissions per block. Uploads are smaller and block cadence is slower than the protocol achieved in testing.

In an end-to-end benchmark with 120 validators, Fibre sustained 3.07 terabits per second of throughput. The launch limits sit well below that figure.