import { Hex } from 'viem';
/**
 * Normalize a wallet-returned BTC public key to the canonical x-only
 * 64-char lowercase hex form (no 0x prefix).
 *
 * Throws on empty/non-string input. Idempotent on x-only input.
 */
export declare function normalizeXOnlyPubkey(raw: unknown): string;
/**
 * Normalize a wallet-returned BIP-322 signature into 0x-prefixed hex.
 *
 * Accepts:
 *  - 0x-prefixed lowercase/uppercase hex
 *  - unprefixed hex (wins over base64 when input is pure `[0-9a-fA-F]+`)
 *  - canonical standard base64 (`[A-Za-z0-9+/]` with `=` padding to a
 *    multiple of 4 and no non-canonical encodings)
 *
 * Rejects URL-safe base64 (`-`/`_`) and base64 without padding. Wallets
 * known to return BIP-322 signatures (Keystone, UniSat, OKX, OneKey,
 * Unisat) all use standard base64; URL-safe is an explicit non-goal.
 */
export declare function normalizePopSignature(raw: unknown): Hex;
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