A chain commits to a model's 32-byte hash for cents; keeping the gigabytes it points to retrievable is a separate, recurring bill. Pick a model and horizon and watch three rent-charging storage layers race Arweave's pay-once permanence to a crossover — plus the on-chain byte cost and cold-load wall.
On-chain AI loves to say a model is 'stored on-chain.' But a chain commits to a 32-byte hash for cents; keeping the 140 GB it points to retrievable is a separate, recurring, surprisingly centralized bill. The storage math, erasure coding, and the retrieval wall.