/**
 * @fileoverview Merkle proof types for the blockchain ledger.
 *
 * Defines the direction enum, proof step interface, and inclusion proof
 * interface used by the IncrementalMerkleTree and proof verification logic.
 *
 * @see Design: Merkle Tree Commitment Layer — New Types
 * @see Requirements 3.1, 3.2, 4.1
 */
import { Checksum } from '../../types/checksum';
/**
 * Direction indicator for a sibling hash in a Merkle proof path.
 * LEFT means the sibling is on the left; the current hash is on the right.
 * RIGHT means the sibling is on the right; the current hash is on the left.
 */
export declare enum MerkleDirection {
    LEFT = 0,
    RIGHT = 1
}
/**
 * A single step in a Merkle authentication path.
 */
export interface IMerkleProofStep {
    /** The sibling hash at this level. */
    readonly hash: Checksum;
    /** Whether the sibling is on the left or right. */
    readonly direction: MerkleDirection;
}
/**
 * An inclusion proof for a single leaf in the Merkle tree.
 */
export interface IMerkleProof {
    /** The leaf hash (entryHash of the ledger entry). */
    readonly leafHash: Checksum;
    /** Zero-based index of the leaf in the tree. */
    readonly leafIndex: number;
    /** Total number of leaves in the tree when the proof was generated. */
    readonly treeSize: number;
    /** Authentication path from leaf to root. */
    readonly path: readonly IMerkleProofStep[];
}
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