import { CryptoBackend, XOnlyPointAddTweakResult } from './backend.js';
import { Bytes32, MessageHash, PrivateKey, PublicKey, SchnorrSignature, Signature, XOnlyPublicKey } from './branded.js';
/**
 * {@link CryptoBackend} implementation backed by `@noble/curves/secp256k1`.
 *
 * Pure JavaScript, no native dependencies.
 *
 * Prefer {@link createNobleBackend} for construction.
 */
export declare class NobleBackend implements CryptoBackend {
    /** @inheritDoc */
    isPrivate(d: Uint8Array): boolean;
    /** @inheritDoc */
    isPoint(p: Uint8Array): boolean;
    /** @inheritDoc */
    isXOnlyPoint(p: Uint8Array): boolean;
    /** @inheritDoc */
    pointFromScalar(d: PrivateKey, compressed?: boolean): PublicKey | null;
    /** @inheritDoc */
    pointCompress(p: PublicKey, compressed?: boolean): PublicKey;
    /** @inheritDoc */
    pointAddScalar(p: PublicKey, tweak: Bytes32, compressed?: boolean): PublicKey | null;
    /** @inheritDoc */
    xOnlyPointAddTweak(p: XOnlyPublicKey, tweak: Bytes32): XOnlyPointAddTweakResult | null;
    /** @inheritDoc */
    privateAdd(d: PrivateKey, tweak: Bytes32): PrivateKey | null;
    /** @inheritDoc */
    privateNegate(d: PrivateKey): PrivateKey;
    /** @inheritDoc */
    sign(hash: MessageHash, privateKey: PrivateKey, extraEntropy?: Uint8Array): Signature;
    /** @inheritDoc */
    verify(hash: MessageHash, publicKey: PublicKey, signature: Signature): boolean;
    /** @inheritDoc */
    signSchnorr(hash: MessageHash, privateKey: PrivateKey, extraEntropy?: Uint8Array): SchnorrSignature;
    /** @inheritDoc */
    verifySchnorr(hash: MessageHash, publicKey: XOnlyPublicKey, signature: SchnorrSignature): boolean;
}
/**
 * Creates a {@link NobleBackend} instance.
 *
 * @returns A new pure-JS secp256k1 backend powered by `@noble/curves`.
 */
export declare function createNobleBackend(): NobleBackend;
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