What Is Celestia (TIA)? Celestia Explained

What Is Celestia (TIA)?

Celestia is a modular blockchain that mainly focuses on consensus and data availability. Simply put, Celestia makes sure data is recorded in the right order and is available to participants who want to verify it.

Celestia is mainly meant to support other blockchains and rollups. A rollup is a blockchain layer that processes transactions itself, but can publish the related data on another layer. Celestia does not execute those transactions itself, and it also does not decide whether the calculations of such a rollup are correct. The network mainly makes sure the published data is available and can be checked.

TIA is the native token of the Celestia network. TIA is used, among other things, for transaction fees and staking. The token's ticker is TIA.

Celestia went live on October 31, 2023 as Mainnet Beta, under the codename Lemon Mint.

Key Takeaways

• Celestia is a modular blockchain for consensus and data availability.
• The network does not execute or validate rollup transactions itself.
• TIA is the token for transaction fees, staking, and on-chain governance.
• Light nodes can use data availability sampling to verify block data without downloading full blocks.
• The modular setup gives applications freedom, but also makes them dependent on their own execution and settlement layer.
• Network upgrades have improved scalability and gradually lowered the annual token inflation.

How Does Celestia Work?

Applications and users can publish data on Celestia in the form of blobs. This happens through a PayForBlobs transaction. Each blob gets a namespace, which you can think of as a label that separates data from different applications.

That makes it easier for an application to retrieve only the data that matters to it, without having to process all the other data in a block.

Block producers collect this data into blocks. Then validators reach agreement on the order of those blocks. Celestia uses Proof of Stake for this. Validators lock up TIA as stake and help secure the network.

An important part of Celestia is data availability sampling (DAS). This lets light nodes check whether the data in a block is available without downloading the full block.

To do this, light nodes randomly request small parts of the block, along with cryptographic proofs. If enough checks succeed, they get a high level of confidence that the full block data is available.

Celestia also uses erasure coding. This adds extra data to the original block data. As a result, the full data can be reconstructed as long as enough pieces are available. This makes data availability sampling possible and makes it harder to withhold only part of the block data.

The important thing is that Celestia checks whether data is available, but not whether transactions or smart contracts inside a rollup were executed correctly. That check happens inside the rollup or other layers that use Celestia.

Celestia is built with the Cosmos SDK and uses CometBFT for consensus. Thanks to several network upgrades, block time has been reduced to about 3 seconds, which lets the network produce new blocks more often and creates more room for data publication.

Celestia (TIA) Overview

How Does Celestia's Modular Architecture Work?

On many blockchains, different tasks are handled by the same network, such as processing transactions, reaching consensus, and storing data. This is called a monolithic blockchain. Ethereum is a well-known example.

Celestia takes a different approach. The network mainly focuses on consensus and data availability, while other layers can handle execution and settlement.

Execution means running the rules of an application and determining what changes after a transaction. Settlement is the layer where transaction results are recorded and where any disputes about those results can be resolved.

That means multiple rollups can use Celestia as a data availability layer, without Celestia itself having to run their application logic.

In July 2026, Celestia Labs also acquired Sovereign Labs, the team behind the Sovereign SDK, to further expand the development of custom blockchains and rollups.

For example, a rollup can publish transaction data on Celestia and use Ethereum for settlement. So Celestia does not automatically replace those other layers.

To organize data, Celestia uses Namespaced Merkle Trees. Data is split across different namespaces. You can think of a namespace as a label for the data of a specific application.

That lets an application request its own data in a targeted way and cryptographically verify that the returned data is complete.

Light nodes also play an important role. With data availability sampling, they can check whether the data in a block is available without downloading the whole block.

The modular approach does not mean every application automatically gets the same security and settlement properties. Those also depend on the execution and settlement layer the application uses.

What Role Does TIA Play in Celestia?

TIA has several functions within the Celestia network.

Its most direct function is paying transaction fees. For example, TIA is used to pay for publishing blobs, or data, on Celestia.

TIA is also used for staking. Validators lock up TIA to take part in the network's Proof-of-Stake security. If you do not want to run your own validator, you can delegate TIA to a validator and receive part of the staking rewards.

Those rewards are not a fixed return. They depend, among other things, on the issuance of new TIA and the commission a validator takes.

Originally, the network started with annual token inflation of 8%. Through network upgrades, including Lotus and Matcha, this inflation has been gradually reduced. Over the long term, inflation is moving toward a floor of 1.5%.

Staking also comes with risks and practical rules. For example, if a validator gets slashed because of serious bad behavior, part of the delegated TIA can be lost. In addition, staking rewards sometimes have to be claimed manually.

TIA is also used for on-chain governance. TIA holders can submit proposals and vote on certain network parameters and decisions about the network.

From the start of Celestia, 2% of the block rewards goes to the community pool. Through governance, the community can decide to use money from this pool for initiatives within the Celestia ecosystem.

How Did Celestia Start?

Development of Celestia began in 2019 under the name LazyLedger. The original idea was to build a blockchain that mainly focuses on consensus and data availability, without executing all application transactions itself.

Celestia was co-founded by Mustafa Al-Bassam, Ismail Khoffi, and John Adler. They worked on a blockchain architecture where consensus and data availability are separated from transaction execution.

In 2021, LazyLedger was renamed Celestia.

On October 31, 2023, the network went live as Mainnet Beta, under the codename Lemon Mint.

The core idea stayed the same: applications can use their own rules for executing transactions, while Celestia provides a specialized layer for consensus and data availability.

What Are the Benefits of Celestia?

Celestia has a few important features:

• Specialized in data availability: Rollups and other blockchains can use Celestia to publish data while executing their transactions themselves.

• Verification without downloading full blocks: With data availability sampling, light nodes can check whether block data is available without retrieving the full block.

• Flexible architecture: Different rollups can use the same Celestia layer while choosing their own execution and settlement mechanisms.

• Targeted data retrieval: With Namespaced Merkle Trees, applications can specifically request and verify their own data from a Celestia block.

What Are the Downsides and Risks of Celestia?

Celestia also has a few important points to keep in mind:

• Celestia does not check whether application transactions are valid: The network mainly checks whether published data is available and recorded in the right order. Rollups remain responsible for executing and checking their own transactions.

• Data availability is not permanent storage: Just because data is available when it is published does not mean historical blob data will always be easy to retrieve. Additional storage solutions may be needed for that.

• Limited active validator set: Celestia has an active validator set of 100 validators. The distribution of staked TIA across these validators therefore plays an important role in the decentralization of consensus.

• Staking risks: If a validator double-signs, it can be slashed. That can also cause part of the delegated TIA to be lost. After stopping staking, there is also a 21-day unbonding period.

• Relatively new technology: Celestia introduced techniques like data availability sampling on Mainnet Beta. The network and the technology continue to develop through network upgrades.

Conclusion

Celestia is a modular blockchain that mainly focuses on consensus and data availability. Instead of executing all application transactions itself, Celestia provides a specialized layer where rollups and other blockchains can publish their data.

One important technique here is data availability sampling. This lets light nodes check whether block data is available without downloading full blocks.

TIA is the native token of Celestia and is used for transaction fees, staking, and governance.

The modular setup gives applications the freedom to choose their own execution and settlement mechanisms. At the same time, it means Celestia is not automatically responsible for the correct execution or security of those other layers.