420 Attention concepts

A campaign binds sponsor, metadata/audience commitments, verifier, budget, reward rate, per-account cap and time window.

A consent record is account-controlled, reversible state with a monotonic revision and policy commitment.

A proof commits campaign, participant, verifier, observation time, attention units and evidence hash. A single-use nullifier prevents replay.

A reward entitlement is reserved before it becomes claimable. Sponsor campaign funds are segregated liabilities.