// function to check that sure the blockchain is valid
// It checks that the hash chain is consistent throughout
// the blockchain.
private void validate_Click(object sender, EventArgs e)
{
if (blockchain.Blocks.Count == 1)
{
if (blockchain.validateMerkleRoot(blockchain.Blocks[0]))
{
richTextBox1.Text = "Valid Blockchain";
}
else
{
richTextBox1.Text = "Invalid Blockchain: Merkle Root";
}
return;
}
else
{
for (int i = 1; i < blockchain.Blocks.Count - 1; i++)
{
if (blockchain.Blocks[i].prevHash != blockchain.Blocks[i - 1].hash || // hash line check
!blockchain.validateMerkleRoot(blockchain.Blocks[i]) || // merkle root check
!blockchain.validateHash(blockchain.Blocks[i])) //hash check
{
richTextBox1.Text = "Invalid Blockchain";
return;
}
}
}
richTextBox1.Text = "Valid Blockchain";
}
//Checks validity of blockchain using merkle root and checking hashes align
private void validateChain_Click(object sender, EventArgs e)
{
if (blockchain.Blocks.Count == 1)
{
if (!blockchain.validateMerkleRoot(blockchain.Blocks[0]))
{
richTextBox1.Text = "Blockchain is invalid";
}
else
{
richTextBox1.Text = "Blockchain is valid";
}
return;
}
bool valid = true;
for (int i = 1; i < blockchain.Blocks.Count - 1; i++)
{
if (blockchain.Blocks[i].prevHash != blockchain.Blocks[i - 1].hash || !blockchain.validateMerkleRoot(blockchain.Blocks[i]))
{
richTextBox1.Text = "Blockchain is invalid";
return;
}
}
if (valid)
{
richTextBox1.Text = "Blockchain is valid";
}
else
{
richTextBox1.Text = "Blockchain is invalid";
}
}
private void validateChain_Click(object sender, EventArgs e)
{
// Contiguity checks
if (blockchain.Blocks.Count == 1)
{
if (!blockchain.validateMerkleRoot(blockchain.Blocks[0]))
{
richTextBox1.Text = "Blockchain is invalid.";
}
else
{
richTextBox1.Text = "Blockchain is valid.";
}
return;
}
for (int i = 1; i < blockchain.Blocks.Count - 1; i++)
{
// Compare hash to previous hash for all blocks in the chain and check cransactions via merkle root.
if (blockchain.Blocks[i].prevHash != blockchain.Blocks[i - 1].hash || !blockchain.validateMerkleRoot(blockchain.Blocks[i]))
{
richTextBox1.Text = "Blockchain is invalid.";
return;
}
}
richTextBox1.Text = "Blockchain is valid.";
}