Arweave

Arweave sells permanent storage for a single upfront payment. The fee funds an endowment that pays storage providers indefinitely, on the assumption that the real cost of storage declines faster than the endowment is drawn down — a financial mechanism as much as a technical one.

The endowment is the core assumption

Payment for two hundred years of storage is calculated using conservative estimates of falling storage costs, with the surplus paying providers over time. The model works if storage keeps getting cheaper at something near its historical rate. It is an explicit, checkable assumption rather than a vague promise, and it is where the design succeeds or fails.

Proof of access rewards keeping old data

Miners must demonstrate access to a randomly chosen previous block in order to mine a new one. That makes storing the network's history a requirement for earning, rather than an unrewarded cost. It solves the incentive problem that would otherwise lead providers to discard old data nobody happens to be requesting.

The blockweave stores rather than chains

Blocks reference earlier blocks other than their immediate predecessor, so nodes need not hold the entire history to participate — they need proven access to specific parts. This allows the dataset to grow beyond what any single node could store while keeping verification tractable.

Permanence has consequences

Data cannot be deleted. That is the product, and it means anything uploaded — including material that is unlawful, private or simply regretted — persists. Applications built on it must treat every upload as irreversible, which is a genuine design constraint rather than a marketing point.

Where it fits

Arweave suits archives, provenance records and content that must outlive the organisation that published it. For mutable or deletable data it is the wrong tool by design, and no configuration changes that.