/**
 * Derive the per-day salt from the server secret. Rotating the salt daily means a
 * visitor hash cannot be correlated across days — the cornerstone of the
 * cookieless, no-persistent-ID privacy model (ADR 0003).
 */
export declare function dailySalt(secret: string, date?: Date): string;
/**
 * Compute the cookieless visitor id as `hash(ip + ua + dailySalt)`. The raw IP is
 * never stored — only this derived, daily-rotating hash leaves the server.
 */
export declare function visitorHash(ip: string, ua: string, salt: string): string;
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