import type { NostrEvent, VaultShareData } from '../types.js';
/**
 * Build a kind 30480 vault share event (unsigned, unencrypted).
 *
 * @security The `content` field contains the RAW CONTENT KEY in hex.
 * This event MUST be NIP-44 encrypted and NIP-59 gift-wrapped before
 * publishing. Publishing without encryption leaks the content key.
 */
export declare function buildVaultShareEvent(authorPubkey: string, recipientPubkey: string, ckHex: string, epochId: string, tier: string): NostrEvent;
/**
 * Parse a vault share event into structured data.
 * Returns null if the event is not a valid kind 30480.
 */
export declare function parseVaultShare(event: Record<string, unknown>): VaultShareData | null;
/**
 * Build a Nostr filter for vault share events.
 * When both epochId and tier are provided, filters by the exact d-tag value.
 * When only authorPubkey is provided, returns all shares from that author.
 */
export declare function buildVaultShareFilter(authorPubkey: string, epochId?: string, tier?: string): Record<string, unknown>;
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