Shield States¶

Introduction¶

When a user opens a Polkadot Product on Polkadot Web, they're trusting a few things: that the bundle their browser fetched matches what DotNS says the .dot name points at, that the Host's state is what it should be, and that nothing in the runtime has been tampered with. Shield states are how Polkadot Web surfaces that trust posture in the browser UI — a security indicator the user can glance at to see whether the loaded Product is in a known-good state.

This page documents what shield states exist, what each one means, and when the state changes.

Conceptual Model¶

A shield state communicates two things at once:

• Bundle integrity: Does the running bundle match the CID that DotNS resolves to for the .dot name in the address bar? A mismatch, such as a Product loaded from a stale cache that no longer matches the published version, is a state transition worth showing.
• Host posture: Is the Host's expected runtime state intact? Web's sandbox guarantees only hold if the Host itself is in a known state; the shield surfaces deviations.

A user will see a single shield indicator at any moment, and that indicator tells them whether everything is in the "expected" posture or whether something the user should know about has happened.

Why Products Should Care¶

For a Product developer, the shield states are not a surface your code calls directly. They are a property of the Host that affects how users perceive your Product. Two implications:

• Host-owned indicator: A Product cannot override or hide the shield state. The indicator lives in the Host's UI, outside the Product's sandbox. This is intentional: a Product cannot mask a security state from its users.
• Reload signals: Drastic shield-state changes can signal a reload. If a user is in the middle of a long-running interaction with your Product and DotNS points the .dot name at a different CID, the Host may transition to an "out-of-sync" state and prompt the user to reload. Build flows that tolerate this, such as idempotent retries and durable client-side state via KvStore, rather than assuming a single Product session is uninterrupted.

Where to Go Next¶