import { Reader, Writer } from './codec.js';
export declare const HEADER_MAGIC: Buffer<ArrayBuffer>;
export type Op = {
    kind: 'sha256';
} | {
    kind: 'sha1';
} | {
    kind: 'ripemd160';
} | {
    kind: 'append';
    arg: Buffer;
} | {
    kind: 'prepend';
    arg: Buffer;
} | {
    kind: 'reverse';
};
export type Attestation = {
    kind: 'pending';
    uri: string;
} | {
    kind: 'bitcoin';
    height: number;
} | {
    kind: 'unknown';
    tag: Buffer;
    payload: Buffer;
};
export type Timestamp = {
    msg: Buffer;
    attestations: Attestation[];
    ops: {
        op: Op;
        next: Timestamp;
    }[];
};
export type DetachedProof = {
    hashOp: 'sha256';
    fileHash: Buffer;
    timestamp: Timestamp;
};
export declare function applyOp(op: Op, msg: Buffer): Buffer;
export declare function deserializeTimestamp(reader: Reader, initialMsg: Buffer): Timestamp;
export declare function serializeTimestamp(writer: Writer, ts: Timestamp): void;
export declare function deserializeDetached(bytes: Buffer): DetachedProof;
export declare function serializeDetached(proof: DetachedProof): Buffer;
export declare function fileDigest(proof: DetachedProof): Buffer;
export declare function collectAttestations(ts: Timestamp): {
    msg: Buffer;
    attestation: Attestation;
}[];
export declare function mergeTimestamp(into: Timestamp, other: Timestamp): void;
/** Single-file stamp tree: fileHash —append(nonce16)→ —sha256→ tip (calendar attestations land on tip). */
export declare function stampSkeleton(fileHash: Buffer, nonce?: NonSharedBuffer): {
    proof: DetachedProof;
    tip: Timestamp;
};
export declare function nodesWithAttestations(ts: Timestamp): Timestamp[];
export declare function hasBitcoinAttestation(ts: Timestamp): boolean;
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