import { Keypair } from "@solana/web3.js";
export declare const VEILO_SPENDING_KEY_DOMAIN = "veilo_spending_key_v1";
/** Exact message signed by Veilo clients to derive a spending-key root. */
export declare function getSpendingKeyMessage(index?: number): Uint8Array;
/** Convert the deterministic 64-byte wallet signature into a spending key. */
export declare function deriveSpendingKeyFromSignature(signature: Uint8Array): Uint8Array;
/**
 * Wallet-standard-friendly spending-key derivation.
 * The callback owns signing; the SDK never receives the wallet secret key.
 */
export declare function deriveSpendingKeyWithSigner(signMessage: (message: Uint8Array) => Promise<Uint8Array>, index?: number): Promise<Uint8Array>;
/**
 * Keypair convenience matching the wallet-app and extension implementation.
 * Keep the keypair on the user's device and never send it to a service.
 */
export declare function deriveSpendingKeyFromKeypair(keypair: Keypair, index?: number): Uint8Array;
/** Serialize an ephemeral claimant secret for an encrypted relayer request. */
export declare function encodeClaimantSecretKey(keypairOrSecret: Keypair | Uint8Array): string;