import type { Checkpoint } from './checkpoint.js';
import type { SignatureLine } from './signed-note.js';
/**
 * In-memory pairing of a parsed Checkpoint, the signature lines
 * extracted from its signed-note envelope, and the primary log
 * signature's POSIX-seconds timestamp.
 *
 * The wire format is the concatenation of
 * `serializeCheckpointBody(checkpoint)` and the emitted signature
 * lines per c2sp.org/signed-note §Format. Each signature line's
 * opaque payload is a `timestamped_signature` struct per
 * c2sp.org/tlog-cosignature §Format; the `timestamp` field surfaced
 * here is the one extracted from the primary log signature (the
 * signature line whose `name` matches the checkpoint origin). For
 * checkpoints with additional witness cosignatures, each witness
 * carries its own timestamp inside its own signature line's payload
 * and is accessed by re-parsing that line via
 * `parseCosigSignaturePayload`.
 */
export interface SignedTreeHead {
    readonly checkpoint: Checkpoint;
    readonly signatures: readonly SignatureLine[];
    /**
     * POSIX-seconds timestamp the primary log cosignature was issued
     * at, per the `timestamped_signature` struct in
     * c2sp.org/tlog-cosignature §Format. Non-negative safe integer;
     * see `parseCosigSignaturePayload` for the upper-bound semantics
     * (Number-safe range, smaller than the spec's `2^63 - 1` ceiling).
     */
    readonly timestamp: number;
}