/* BLOCKCHAIN VALIDATION */
// Validate the integrity of the state of the Blockchain
private void Validate_Click(object sender, EventArgs e)
{
// CASE: Genesis Block - Check only hash as no transactions are currently present
if (blockchain.blocks.Count == 1)
{
if (!Blockchain.ValidateHash(blockchain.blocks[0])) // Recompute Hash to check validity
{
UpdateText("Blockchain is invalid");
}
else
{
UpdateText("Blockchain is valid");
}
return;
}
for (int i = 1; i < blockchain.blocks.Count - 1; i++)
{
if (
blockchain.blocks[i].prevHash != blockchain.blocks[i - 1].hash || // Check hash "chain"
!Blockchain.ValidateHash(blockchain.blocks[i]) || // Check each blocks hash
!Blockchain.ValidateMerkleRoot(blockchain.blocks[i]) // Check transaction integrity using Merkle Root
)
{
UpdateText("Blockchain is invalid");
return;
}
}
UpdateText("Blockchain is valid");
}
private void Validate_Click(object sender, EventArgs e)
{
// CASE: Genesis Block - Check only the hash since there are currently no transactions.
if (blockchain.Blocks.Count == 1)
{
if (!Blockchain.ValidateHash(blockchain.Blocks[0])) // Check the validity of Hash by recalculating it.
{
outputToRichTextBox1("Blockchain is invalid - Hash ");
}
else
{
outputToRichTextBox1("Blockchain is valid");
}
return;
}
Console.WriteLine(" NewBlock: " + (blockchain.Blocks.Count - 1));
for (int i = 1; i < blockchain.Blocks.Count - 1; i++)
{
Console.WriteLine("Hash for block " + i);
if (
blockchain.Blocks[i].prevHash != blockchain.Blocks[i - 1].hash || // Check the "chain" hash.
!Blockchain.ValidateHash(blockchain.Blocks[i]) || // Check the hash of each Block.
!Blockchain.ValidateMerkleRoot(blockchain.Blocks[i]) // Merkle Root can be used to check transaction integrity.
)
{
outputToRichTextBox1("Blockchain is invalid " + (blockchain.Blocks[i].prevHash != blockchain.Blocks[i - 1].hash).ToString() + " " +
!Blockchain.ValidateHash(blockchain.Blocks[i]) + " " + // Check the hash of each Block.
!Blockchain.ValidateMerkleRoot(blockchain.Blocks[i]) + " " + blockchain.Blocks[i].nonce);
return;
}
}
outputToRichTextBox1("Blockchain is valid");
}