private void button10_Click(object sender, EventArgs e) { if (blockchain.CheckBlocks()) { richTextBox1.Text += "\nBlocks are not coherent\n"; } else if (blockchain.CheckBlocksMerkle()) { richTextBox1.Text += "\nTransactions have been tampered with\n"; } else if (blockchain.CheckTransactionSignature()) { richTextBox1.Text += "\nTransaction signatures have been tampered with\n"; } else { richTextBox1.Text += "\nBlocks are coherent\n"; } }