/**
 * UTXO Availability Validation
 *
 * Validates that UTXOs referenced in a pre-pegin transaction are still unspent
 * BEFORE asking the user to sign. This prevents wasted signing effort when
 * UTXOs have already been spent by unrelated transactions.
 *
 * These functions are pure — they accept pre-fetched UTXOs and perform no I/O.
 * The vault service wrapper is responsible for fetching UTXOs from the mempool.
 */
/**
 * Reference to a Bitcoin UTXO by its outpoint (txid + vout).
 *
 * Used by the availability check to compare a Pre-PegIn transaction's
 * declared inputs against the wallet's current spendable set. Txids are
 * compared case-insensitively; callers should treat the txid as opaque
 * lowercase hex.
 */
export interface UtxoRef {
    txid: string;
    vout: number;
}
/**
 * Information about a missing/spent UTXO.
 */
export interface MissingUtxoInfo {
    /** Transaction ID of the missing UTXO */
    txid: string;
    /** Output index of the missing UTXO */
    vout: number;
}
/**
 * Result of UTXO validation.
 */
export interface UtxoValidationResult {
    /** Whether all UTXOs are still available */
    allAvailable: boolean;
    /** List of missing UTXOs (if any) */
    missingUtxos: MissingUtxoInfo[];
    /** Total number of inputs checked */
    totalInputs: number;
}
/**
 * Error thrown when UTXOs are not available.
 */
export declare class UtxoNotAvailableError extends Error {
    readonly missingUtxos: MissingUtxoInfo[];
    constructor(missingUtxos: MissingUtxoInfo[]);
}
/**
 * Extract input references (txid:vout) from an unsigned transaction.
 *
 * @param unsignedTxHex - Unsigned transaction hex
 * @returns Array of input references
 */
export declare function extractInputsFromTransaction(unsignedTxHex: string): Array<{
    txid: string;
    vout: number;
}>;
/**
 * Validate that all UTXOs in a transaction are still available.
 *
 * Pure function — accepts pre-fetched UTXOs instead of making network calls.
 * This should be called BEFORE signing to avoid wasting user effort
 * signing a transaction that will fail to broadcast.
 *
 * @param unsignedTxHex - Unsigned transaction hex
 * @param availableUtxos - Pre-fetched list of available UTXOs for the depositor
 * @returns Validation result with missing UTXO details
 */
export declare function validateUtxosAvailable(unsignedTxHex: string, availableUtxos: UtxoRef[]): UtxoValidationResult;
/**
 * Validate UTXOs and throw if any are not available.
 *
 * Pure convenience function that combines validation and error throwing.
 *
 * @param unsignedTxHex - Unsigned transaction hex
 * @param availableUtxos - Pre-fetched list of available UTXOs for the depositor
 * @throws UtxoNotAvailableError if any UTXOs are not available
 * @throws Error if validation fails
 */
export declare function assertUtxosAvailable(unsignedTxHex: string, availableUtxos: UtxoRef[]): void;
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