import { ExtPsbt } from '../psbt/extPsbt.js';
/**
 * Verify that an input of `ExtPsbt` can be unlocked correctly. The extPsbt should be finalized.
 * @param extPsbt
 * @param inputIndex
 * @returns true if success
 */
export declare function bvmVerify(extPsbt: ExtPsbt, inputIndex?: number): true | string;
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