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# Unibase DA

The decentralized **data availability + storage** layer for AI — availability is verified **on-chain with ZK fraud proofs**, secured by an **Honest-One** model (no majority assumption). It is the verifiable storage substrate beneath Membase.

### Why Unibase DA

| vs. EigenDA / Celestia / Avail | Unibase DA                    |
| ------------------------------ | ----------------------------- |
| Off-chain committee / sampling | **On-chain ZK verification**  |
| Honest majority                | **Honest one**                |
| Validity / sampling proofs     | **Fraud proofs (optimistic)** |
| On-chain cost per write        | **Cost only on dispute**      |

* **Trustless writes** — the client cryptographically verifies the network encoded exactly its bytes; no single node is trusted.
* **Cheap by default** — expensive on-chain ZK verification runs only when a proof is challenged.
* **Erasure-coded durability** — Reed–Solomon `(N,K)`; any `K` of `N` shards reconstruct the data.

### Node roles

| Role          | Responsibility                                                                 |
| ------------- | ------------------------------------------------------------------------------ |
| **Stream**    | Encode uploads, commit, stage shards                                           |
| **Storage**   | Store shards, submit availability proofs (stake-backed)                        |
| **Validator** | Re-verify proofs, challenge fraud — *one* honest validator secures the network |
| **Gateway**   | Read-only indexer + HTTP API for SDK/UI                                        |
| **Hub**       | Lightweight gateway for app integrations                                       |

### Networks

| Network          | `CHAIN_TYPE`   | Status      |
| ---------------- | -------------- | ----------- |
| Base Sepolia     | `base-sepolia` | ✅ Testnet   |
| Base Mainnet     | `base`         | 🔍 In audit |
| Ethereum Mainnet | `ethereum`     | 🛣 Roadmap  |

> DA settles on **Ethereum and its L2 Base** — Base as the primary low-cost L2, Ethereum as the security anchor (availability inherits Ethereum's security, aligning with the ERC-8004 ecosystem). BSC is used by the application layer (Pay/AIP), **not** by DA.

### Next steps

* [Architecture](/unibase-docs/unibase-da/components.md) — how it works, end to end
* [Verifiable Storage](/unibase-docs/unibase-da/unibase-storage.md) — the positioning: sell verifiability, not gigabytes
* [Quick Start](/unibase-docs/unibase-da/quick-start.md) — upload & download a file
* [Nodes Bootstrap](/unibase-docs/unibase-da/nodes-bootstrap.md) — run a Stream / Storage / Validator node
* [Nodes Operations](/unibase-docs/unibase-da/nodes-operations.md) — balances, revenue, withdrawals