/**
 * Bitcoin Chain Adapter (Legacy — signature-only)
 *
 * Provides UTXO selection and balance queries via Mempool.space API.
 * Wallet creation and raw message signing work (agent node is curve-agnostic).
 *
 * NOTE: For full Bitcoin P2TR (Taproot) support with auto-broadcast, use
 * BitcoinTaprootAdapter instead. It provides:
 * - Real secp256k1 EC point arithmetic for BIP-341 key tweaking
 * - Full transaction serialization with Taproot witness
 * - Per-input BIP-341 sighash computation
 * - Broadcast via Mempool.space API
 *
 * This adapter is kept for Dogecoin/Litecoin compatibility (which share
 * Bitcoin's UTXO model but lack full P2TR support).
 *
 * @see BitcoinTaprootAdapter for full P2TR lifecycle support
 */
import { ChainAdapter, BtcTransaction } from '../core/types';
export declare class BitcoinAdapter implements ChainAdapter {
    private apiUrl;
    private isTestnet;
    constructor(network?: 'mainnet' | 'testnet', apiUrl?: string);
    getRpcUrl(): string;
    /**
     * Build an unsigned Bitcoin transaction
     *
     * Fetches UTXOs, selects inputs, constructs outputs, and returns
     * the serialized unsigned transaction for Schnorr signing.
     *
     * @returns hex-encoded sighash for FROST signing
     */
    buildTransaction(tx: BtcTransaction, fromAddress: string): Promise<string>;
    /**
     * Attach a Schnorr signature to the unsigned transaction
     */
    attachSignature(unsignedTx: string, signature: string): Promise<string>;
    /**
     * Broadcast a signed transaction to the Bitcoin network.
     *
     * NOTE: This requires a properly serialized raw Bitcoin transaction (hex).
     * The built-in buildTransaction() returns a signing payload, not a
     * wire-format TX. For full P2TR broadcast support, integrate bitcoinjs-lib
     * to serialize the transaction with witness data before calling this method.
     */
    broadcast(signedTx: string): Promise<string>;
    /**
     * Get Bitcoin address balance in satoshis
     */
    getBalance(address: string): Promise<string>;
    /** Fetch UTXOs for an address */
    private fetchUtxos;
    /** Get recommended fee rates */
    getFeeRates(): Promise<{
        fastest: number;
        halfHour: number;
        hour: number;
    }>;
}
export declare function createBitcoinAdapter(network?: 'mainnet' | 'testnet'): BitcoinAdapter;
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