/**
 * Polkadot Chain Adapter
 *
 * Builds Polkadot extrinsics using SCALE codec, attaches Ed25519
 * signatures from the FROST threshold signing network, and broadcasts
 * via Polkadot JSON RPC.
 *
 * Uses Ed25519 key type (not sr25519) for FROST compatibility.
 *
 * Requires: npm install @polkadot/api
 */
import { ChainAdapter, PolkadotTransaction } from '../core/types';
export declare class PolkadotAdapter implements ChainAdapter {
    private rpcUrl;
    private network;
    private polkadotApi;
    constructor(network?: 'mainnet' | 'westend' | 'kusama', rpcUrl?: string);
    getRpcUrl(): string;
    /**
     * Build an unsigned Polkadot balance transfer extrinsic.
     *
     * The signing payload is SCALE-encoded ExtrinsicPayload.
     * If payload > 256 bytes, it's hashed with Blake2b-256 before signing.
     */
    buildTransaction(tx: PolkadotTransaction, fromAddress: string): Promise<string>;
    getSigningPayload(unsignedTx: string): string;
    /**
     * Attach an Ed25519 signature to the Polkadot extrinsic
     */
    attachSignature(unsignedTx: string, signature: string): Promise<string>;
    /**
     * Broadcast a signed Polkadot extrinsic
     */
    broadcast(signedTx: string): Promise<string>;
    /**
     * Get DOT balance in planck
     */
    getBalance(address: string): Promise<string>;
}
export declare function createPolkadotAdapter(rpcUrl?: string): PolkadotAdapter;
export declare function createKusamaAdapter(rpcUrl?: string): PolkadotAdapter;
export declare function createPolkadotWestendAdapter(rpcUrl?: string): PolkadotAdapter;
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