export declare function validateSystemTimelineAnchor(source: unknown, id: unknown): {
    anchor_source: string;
    anchor_id: string;
};
/** Only the Host sees raw system identities; references bind account, environment and conversation. */
export declare function systemTimelineAnchorCodec(key: string, environment: string, userId: number, sessionUid: string): {
    seal(source: unknown, id: unknown): string;
    open(ref: string): {
        anchor_source: string;
        anchor_id: string;
    };
};
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