/**
 * UTXO selection utilities for peg-in transactions.
 * Follows btc-staking-ts methodology with iterative fee calculation.
 */
/**
 * Unspent Transaction Output (UTXO) for funding peg-in transactions.
 */
export interface UTXO {
    /**
     * Transaction ID of the UTXO (64-char hex without 0x prefix).
     */
    txid: string;
    /**
     * Output index within the transaction.
     */
    vout: number;
    /**
     * Value in satoshis.
     */
    value: number;
    /**
     * Script public key hex.
     */
    scriptPubKey: string;
}
export interface UTXOSelectionResult {
    selectedUTXOs: UTXO[];
    totalValue: bigint;
    fee: bigint;
    changeAmount: bigint;
}
/**
 * Selects UTXOs to fund a peg-in transaction with iterative fee calculation.
 *
 * This function implements the btc-staking-ts approach:
 * 1. Filter UTXOs for script validity (no minimum value filter)
 * 2. Sort by value (largest first) to minimize number of inputs
 * 3. Iteratively add UTXOs and recalculate fee until we have enough
 *
 * The fee recalculation is critical because:
 * - Each UTXO added increases transaction size → increases fee
 * - More fee needed might require another UTXO
 * - Change output detection affects fee (adds output size if needed)
 *
 * @param availableUTXOs - All available UTXOs from wallet
 * @param peginAmount - Amount to peg in (satoshis)
 * @param feeRate - Fee rate (sat/vbyte)
 * @param numOutputs - Number of outputs in the unfunded transaction (HTLC + CPFP anchor, before change)
 * @returns Selected UTXOs, total value, calculated fee, and change amount
 * @throws Error if insufficient funds or no valid UTXOs
 */
export declare function selectUtxosForPegin(availableUTXOs: UTXO[], peginAmount: bigint, feeRate: number, numOutputs: number): UTXOSelectionResult;
/**
 * Checks if change amount is above dust threshold.
 *
 * @param changeAmount - Change amount in satoshis
 * @returns true if change should be added as output, false if it should go to miners
 */
export declare function shouldAddChangeOutput(changeAmount: bigint): boolean;
/**
 * Gets the dust threshold value.
 *
 * @returns Dust threshold in satoshis
 */
export declare function getDustThreshold(): number;
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