private async Task <BigInteger> GetLastSyncedBlockNumber(string coinAdapterAddress)
        {
            string     lastSyncedBlockNumber = (await _blockSyncedRepository.GetLastSyncedAsync(coinAdapterAddress))?.BlockNumber;
            BigInteger lastSynced;

            BigInteger.TryParse(lastSyncedBlockNumber, out lastSynced);

            return(lastSynced);
        }