import BlockchainTimeModel from './models/BlockchainTimeModel';
import IBlockchain from './interfaces/IBlockchain';
import ServiceVersionModel from '../common/models/ServiceVersionModel';
import TransactionModel from '../common/models/TransactionModel';
/**
 * Class that communicates with the underlying blockchain using REST API defined by the protocol document.
 */
export default class Blockchain implements IBlockchain {
    uri: string;
    /** Interval for refreshing the cached blockchain time. */
    static readonly cachedBlockchainTimeRefreshInSeconds = 60;
    /** Used for caching the blockchain time to avoid excessive time fetching over network. */
    private cachedBlockchainTime;
    private serviceVersionFetcher;
    private fetch;
    /** URI that handles transaction operations. */
    private transactionsUri;
    private timeUri;
    constructor(uri: string);
    /**
     * Initializes the blockchain client by initializing the cached blockchain time.
     */
    initialize(): Promise<void>;
    /**
     * The function that starts periodically anchoring operation batches to blockchain.
     */
    startPeriodicCachedBlockchainTimeRefresh(): void;
    write(anchorString: string): Promise<void>;
    read(sinceTransactionNumber?: number, transactionTimeHash?: string): Promise<{
        moreTransactions: boolean;
        transactions: TransactionModel[];
    }>;
    getFirstValidTransaction(transactions: TransactionModel[]): Promise<TransactionModel | undefined>;
    readonly approximateTime: BlockchainTimeModel;
    /**
     * Gets the version of the bitcoin service.
     */
    getServiceVersion(): Promise<ServiceVersionModel>;
    /**
     * Gets the latest blockchain time and updates the cached time.
     */
    getLatestTime(): Promise<BlockchainTimeModel>;
}