static void Main(string[] args)
{
Console.WriteLine("Welcome to Loan Star Blockchain!");
Console.WriteLine("*********************************************************************************************************************");
Console.WriteLine("+++ Step 1: Read blockchain difficulty of work parameters");
Console.ReadKey();
Console.WriteLine($"Average mining time (msec):{ChainHelper.MINING_PERIOD}, Difficulty of work (#leading zeroes):{ChainHelper.NUMBER_ZEROES}");
Console.ReadKey();
Console.WriteLine("*********************************************************************************************************************");
Console.WriteLine("+++ Step 2: Add first set of transactions to blockchain");
Console.ReadKey();
var blockchain = new Blockchain();
BlockMiner miner = new BlockMiner(blockchain);
string error;
var trxList1 = new List<Tuple<string,string,double>>();
trxList1.Add(new Tuple<string, string, double>("Anton-Georgescu","Loan003.Repayment.Pay",200));
trxList1.Add(new Tuple<string, string, double>("Alex-Georgescu", "Loan002.Repayment.Pay", 214));
trxList1.Add(new Tuple<string, string, double>("Loan002.Repayment.Credit", "Alex-Georgescu", 200));
Console.WriteLine($"adding {trxList1.Count} raw transactions...");
foreach (var trx in trxList1)
Console.WriteLine($"...[Transaction] from_account:{trx.Item1},to_account:{trx.Item2},amount:{trx.Item3} ");
Console.WriteLine("*********************************************************************************************************************");
Console.WriteLine("+++ Step 3: Run blockchain mining process");
Console.ReadKey();
miner.TransactionPool = AddTransactionsToPool(trxList1);
Console.WriteLine($"{DateTime.Now}: start blockchained mining...");
miner.DoGenerateBlockTest(blockchain);
Console.WriteLine($"{DateTime.Now}: end blockchained mining.");
Console.WriteLine($"blockchain is valid:{blockchain.IsChainValid(out error)}");
Console.WriteLine("*********************************************************************************************************************");
Console.WriteLine("+++ Step 4: Add next set of transactions to blockchain");
Console.ReadKey();
var trxList2 = new List<Tuple<string, string, double>>();
trxList2.Add(new Tuple<string, string, double>("Jake-Trajanovich", "Loan002.Repayment.Pay", 200));
trxList2.Add(new Tuple<string, string, double>("Cora-Trajanovich", "Loan003.Repayment.Pay", 214));
trxList2.Add(new Tuple<string, string, double>("Alex-Georgescu", "Loan002.Repayment.Pay", 72));
Console.WriteLine($"adding {trxList2.Count} raw transactions...");
foreach (var trx in trxList1)
Console.WriteLine($"...[Transaction] from_account:{trx.Item1},to_account:{trx.Item2},amount:{trx.Item3} ");
Console.WriteLine("*********************************************************************************************************************");
Console.WriteLine("+++ Step 5: Run blockchain mining process");
Console.ReadKey();
miner.TransactionPool = AddTransactionsToPool(trxList2);
Console.WriteLine($"{DateTime.Now}: start blockchained mining...");
miner.DoGenerateBlockTest(blockchain);
Console.WriteLine($"{DateTime.Now}: end blockchained mining.");
Console.WriteLine($"blockchain is valid:{blockchain.IsChainValid(out error)}");
string testAccount = "Alex-Georgescu";
Console.WriteLine("*********************************************************************************************************************");
Console.WriteLine($"+++ Step 6: List existing transactions for {testAccount}");
Console.ReadKey();
Console.WriteLine($"list existing transactions for:{testAccount}");
var trxs = blockchain.GetAllTransactionsForAccount(testAccount);
foreach (var tx in trxs)
Console.WriteLine($"timestamp:{tx.timestamp},from:{tx.fromAccount},to:{tx.toAccount},amount:{tx.amount},isvalid:{tx.IsValid()}");
Console.WriteLine("*********************************************************************************************************************");
Console.WriteLine($"+++ Step 7: Tamper with an existing transaction");
Console.ReadKey();
Console.WriteLine("*********************************************************************************************************************");
Console.WriteLine($"tampering with blockchain transaction...");
Console.WriteLine($"[original] timestamp:{blockchain.blocks[2].transactions[0].timestamp},from:{blockchain.blocks[2].transactions[0].fromAccount},to:{blockchain.blocks[2].transactions[0].toAccount},amount:{blockchain.blocks[2].transactions[0].amount},isvalid:{blockchain.blocks[2].transactions[0].IsValid()}");
blockchain.blocks[2].transactions[0].amount = 50;
Console.WriteLine($"[tampered] timestamp:{blockchain.blocks[2].transactions[0].timestamp},from:{blockchain.blocks[2].transactions[0].fromAccount},to:{blockchain.blocks[2].transactions[0].toAccount},amount:{blockchain.blocks[2].transactions[0].amount},isvalid:{blockchain.blocks[2].transactions[0].IsValid()}");
var isChainValid = blockchain.IsChainValid(out error);
Console.WriteLine($"blockchain is valid:{isChainValid} {error}");
Console.WriteLine($"trying to revert transaction to initial value...");
Console.WriteLine($"[original] timestamp:{blockchain.blocks[2].transactions[0].timestamp},from:{blockchain.blocks[2].transactions[0].fromAccount},to:{blockchain.blocks[2].transactions[0].toAccount},amount:{blockchain.blocks[2].transactions[0].amount},isvalid:{blockchain.blocks[2].transactions[0].IsValid()}");
blockchain.blocks[2].transactions[0].amount = 200;
Console.WriteLine($"[tampered] timestamp:{blockchain.blocks[2].transactions[0].timestamp},from:{blockchain.blocks[2].transactions[0].fromAccount},to:{blockchain.blocks[2].transactions[0].toAccount},amount:{blockchain.blocks[2].transactions[0].amount},isvalid:{blockchain.blocks[2].transactions[0].IsValid()}");
isChainValid = blockchain.IsChainValid(out error);
Console.WriteLine($"blockchain is valid:{isChainValid} {error}");
Console.WriteLine("*********************************************************************************************************************");
Console.WriteLine($"+++ Step 8: Run Blockchain Explorer");
Console.ReadKey();
var chainExplore = ChainHelper.BlockchainExplorer(blockchain);
foreach (var line in chainExplore)
Console.WriteLine(line);
Console.ReadKey();
}