/**
 * Cardano Chain Adapter
 *
 * Builds Cardano transactions using CBOR serialization, attaches
 * Ed25519 signatures from the FROST threshold signing network,
 * and broadcasts via Blockfrost API.
 *
 * Requires: npm install @emurgo/cardano-serialization-lib-nodejs
 */
import { ChainAdapter, CardanoTransaction } from '../core/types';
export declare class CardanoAdapter implements ChainAdapter {
    private rpcUrl;
    private network;
    private cardanoWasm;
    private apiKey;
    constructor(network?: 'mainnet' | 'preprod' | 'preview', rpcUrl?: string, apiKey?: string);
    getRpcUrl(): string;
    /**
     * Build an unsigned Cardano transaction.
     *
     * Cardano is UTXO-based. The signing payload is
     * Blake2b-256(transaction_body_cbor).
     */
    buildTransaction(tx: CardanoTransaction, fromAddress: string): Promise<string>;
    getSigningPayload(unsignedTx: string): string;
    /**
     * Attach an Ed25519 signature to the Cardano transaction
     */
    attachSignature(unsignedTx: string, signature: string, publicKey?: string): Promise<string>;
    /**
     * Broadcast a signed Cardano transaction
     */
    broadcast(signedTx: string): Promise<string>;
    /**
     * Get ADA balance in lovelace
     */
    getBalance(address: string): Promise<string>;
    private fetchUtxos;
}
export declare function createCardanoAdapter(apiKey?: string): CardanoAdapter;
export declare function createCardanoPreprodAdapter(apiKey?: string): CardanoAdapter;
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