/**
 * Result of storing an artifact. `id` is always present.
 * CIDs are optional — only populated when the backend supports them.
 */
export interface StorageResult {
    /** Backend-neutral artifact identifier (always present) */
    id: string;
    /** IPFS CID — present when backend supports IPFS (FOC, IPFS-only) */
    ipfsCid?: string;
    /** Filecoin PieceCID — present when backend supports FOC */
    pieceCid?: string;
    /** Verification proof — present when backend supports verification */
    proof?: string;
}
/**
 * Pluggable storage backend. FOC is the default; users can swap to
 * local filesystem, S3, GCS, IPFS-only, or any blob store.
 */
export interface StorageBackend {
    upload(data: Uint8Array, metadata?: Record<string, string>, signal?: AbortSignal): Promise<StorageResult>;
    download(id: string, signal?: AbortSignal): Promise<Uint8Array>;
    verify?(id: string, signal?: AbortSignal): Promise<{
        exists: boolean;
        size: number;
    }>;
}
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