A file becomes a contract with an expiry
A Walrus blob is immutable bytes identified by its contents. The client encodes it into authenticated slivers, reserves capacity with a Sui Storage object and collects node receipts. Once two-thirds of shard weight signs, Sui records the point of availability. Before that point the uploader still carries the availability burden.
The promise is bounded. Mainnet sells at most 53 two-week epochs at a time. A Blob object can be extended or, in some modes, deleted, but burning the Sui object does not erase every copy and does not return WAL. Walrus sells certified storage time, not legal ownership of the information.
