# 5.3 On-Chain Models & Pipelines Registry

The registry layer on Solana formalizes the existence and lineage of all models and workflows.

#### 5.3.1 Workflow Registry

A workflow registered on-chain contains:

* A stable workflow identifier.
* A hash or Merkle root of the workflow IR for tamper-proof verification.
* Creator metadata and semantic tags enabling discoverability.
* Version history, including forks, upgrades, or alternative configurations.

This ensures that workflows have immutable public identities, and any instance derived from them can be compared against this canonical record.

#### 5.3.2 Model Registry

Trained models receive registry entries that maintain:

* Model ID and associated workflow ID.
* Content-addressed hashes of weight files.
* Links to training receipts, datasets, and metrics.
* Ownership information and access permissions.

This enables the ecosystem to verify exactly how a model was produced and ensures that no model artifact can be misrepresented.


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