/**
 * Casper Network Chain Adapter
 *
 * Builds Casper deploys for native CSPR transfers, attaches Ed25519
 * signatures from the FROST threshold signing network, and broadcasts
 * via the Casper JSON-RPC API.
 *
 * Casper uses Ed25519 for signing. The signing payload is the deploy
 * hash, which is Blake2b-256 of the serialized deploy header.
 *
 * No external dependencies — uses native fetch and crypto.
 *
 * Address format: 01<hex> (ed25519 public key prefixed with 01)
 *
 * @example
 * ```typescript
 * import { CasperAdapter } from '@sequence0/sdk';
 *
 * const casper = new CasperAdapter('mainnet');
 *
 * const unsignedTx = await casper.buildTransaction(
 *   { to: '01abc...def', amount: '2500000000', publicKey: 'abc...def' },
 *   '01abc...def'
 * );
 *
 * // ... sign via FROST ed25519 ...
 * const signedTx = await casper.attachSignature(unsignedTx, signatureHex);
 * const deployHash = await casper.broadcast(signedTx);
 * ```
 */
import { ChainAdapter, CasperTransaction } from '../core/types';
export declare class CasperAdapter implements ChainAdapter {
    private rpcUrl;
    private network;
    private chainName;
    constructor(network?: 'mainnet' | 'testnet', rpcUrl?: string);
    getRpcUrl(): string;
    /**
     * Build an unsigned Casper deploy for a native CSPR transfer.
     *
     * The deploy is serialized and hashed using Blake2b-256 to produce
     * the deploy hash, which is the signing payload for Ed25519.
     */
    buildTransaction(tx: CasperTransaction, fromAddress: string): Promise<string>;
    /**
     * Extract the deploy hash (Blake2b-256 of the serialized header)
     * as the signing payload for Ed25519.
     */
    getSigningPayload(unsignedTx: string): string;
    /**
     * Attach an Ed25519 signature to the Casper deploy.
     *
     * Adds the signature to the deploy's approvals list.
     */
    attachSignature(unsignedTx: string, signature: string): Promise<string>;
    /**
     * Broadcast a signed Casper deploy via account_put_deploy RPC.
     *
     * Constructs the JSON deploy structure expected by the Casper node
     * from the serialized payload fields.
     */
    broadcast(signedTx: string): Promise<string>;
    /**
     * Get CSPR balance in motes for an account.
     *
     * Queries the account's main purse URef, then fetches the balance.
     */
    getBalance(address: string): Promise<string>;
}
/** Create a mainnet Casper adapter */
export declare function createCasperAdapter(rpcUrl?: string): CasperAdapter;
/** Create a testnet Casper adapter */
export declare function createCasperTestnetAdapter(rpcUrl?: string): CasperAdapter;
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