/**
 * @fileoverview sha256 helpers shared by the journal writer + reader.
 * @module @skillsmith/core/journal/hash
 */
/** SHA-256 hex digest of arbitrary string/Buffer content. */
export declare function sha256Hex(content: string | Buffer): string;
/**
 * Genesis constant the first journal record's `prev_hash` chains from.
 * Computed (not a literal hex string) so the source documents its own
 * derivation rather than presenting an opaque magic value.
 */
export declare const JOURNAL_GENESIS_HASH: string;
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