/**
 * Independent BIP-340 verification of a wallet-returned Taproot script-path
 * Schnorr signature against an independently-recomputed sighash.
 *
 * Critical Path #7 (CLAUDE.md): the SDK requests script-path signatures with
 * `useTweakedSigner: false, autoFinalized: false`. Wallet support for the
 * untweaked-key flag is inconsistent — older OKX / mobile bridges silently sign
 * with the *tweaked* key, Keystone ignores the flag — and a compromised
 * extension can stuff a 64-byte stub into `tapScriptSig`. A bad signature that
 * the SDK forwards is only caught on broadcast; in the worst case it passes the
 * VP off-chain but Bitcoin rejects it, leaving the depositor's BTC locked in the
 * HTLC until `timelockRefund` matures. This guard rejects such signatures before
 * they are trusted.
 *
 * Why verify against the *locally-built* PSBT, not the wallet-returned one:
 * `assertPsbtUnsignedTxMatches` pins the unsigned transaction but deliberately
 * skips per-input metadata (`witnessUtxo`, `tapLeafScript`). A malicious wallet
 * could rewrite those consistently in the returned PSBT so a wrong-message
 * signature self-validates. The trusted prevout scripts/values and leaf script
 * therefore come from the PSBT we built ourselves (derived from on-chain / WASM
 * sources); only the 64-byte signature comes from the wallet.
 *
 * Reuses the exact primitives `bip322Verify.ts` already depends on — no new
 * dependency:
 *   - `@bitcoin-js/tiny-secp256k1-asmjs` → `verifySchnorr`
 *   - `bitcoinjs-lib` → `Transaction.hashForWitnessV1`
 *   - `../utils/taproot` → `computeTapLeafHash`
 *
 * @module tbv/core/primitives/psbt/verifyScriptPathSchnorrSignature
 */
export interface VerifyScriptPathSchnorrSignatureParams {
    /**
     * Hex of the PSBT we built locally and sent to the wallet (the trusted
     * source of prevout scripts/values and the leaf script). NOT the
     * wallet-returned PSBT.
     */
    requestedPsbtHex: string;
    /** The 64-byte Schnorr signature extracted from the wallet's response (128 hex chars). */
    signatureHex: string;
    /** X-only public key (64 hex chars) the wallet signed the script-path leaf with. */
    signerXOnlyPubkeyHex: string;
    /** Index of the input the signature is for. */
    inputIndex: number;
}
/**
 * Assert that `signatureHex` is a valid BIP-340 Schnorr signature by the
 * `signerXOnlyPubkeyHex` key over the Taproot script-path sighash of
 * `requestedPsbtHex` input `inputIndex` (SIGHASH_DEFAULT).
 *
 * @throws If the requested PSBT is malformed, lacks the prevout/leaf data needed
 *         to recompute the sighash, or the signature does not verify.
 */
export declare function assertScriptPathSchnorrSignature(params: VerifyScriptPathSchnorrSignatureParams): void;
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