/**
 * Envelope payload hash — pinned in its own leaf module so consumers
 * (DictionaryHandle, the active history strategy) can import it
 * without dragging in the `LedgerStore` class.
 *
 * see `constants.ts` for the broader rationale.
 *
 * @internal
 */
import type { EncryptedEnvelope } from '../../../kernel/types.js';
/**
 * Compute the `payloadHash` value for an encrypted envelope. Used by
 * `LedgerStore.append` for both put (hash the new envelope) and
 * delete (hash the previous envelope) paths, and by
 * `DictionaryHandle` so its ledger entries match the same contract.
 *
 * Hashes the open `_data` ciphertext, plus the sealed-field ciphertext
 * map (`_sealed`) when a record carries one — so the ledger attests to
 * both the open body AND every sealed value … and the verify-digest
 * ciphertext map (`_vdig`), each bound only when present — the `_vdig`
 * binding is the temporal-rollback detector for the C1 splice class.
 * `rotateRecordCek` rewrites `_vdig` with no ledger entry, the same
 * pre-existing rotation property `_sealed`/`_cek` already have
 * (`verifyBackupIntegrity` flags rotated records until re-anchored).
 *
 * Returns the empty string when there is no envelope (delete of a
 * never-existed record). The empty string tolerated by the ledger
 * entry's `payloadHash` field as the canonical "nothing here" value.
 */
export declare function envelopePayloadHash(envelope: EncryptedEnvelope | null): Promise<string>;