Bitmaintech updating website
a 2% revenue loss) so the efficiency of the method to generate collisions is of less importance.
If must be noted that even if transaction reordering is the fastest covert method, the overt method is still faster: it doesn’t require to find any collision at all.
There are several algorithmic methods to find collisions: which method to use depends on the number of collisions required, and the size of the colliding groups (e.g.
it’s not the same to find two (different) 2-way collisions that one 4-way collision).
At each level, a double SHA256 of a 128-byte data chunk must be performed (this is because two 32-bytes hashes are concatenated, and SHA256 requires extra space to store the bit length).
Let’s assume SHA256 compression and message expansion take the same time Q.
There are two sub-methods to do it: c1) The easiest way is the create a set of left subtrees and a set of right subtrees in memory and them pair them in all possible ways.
This can only be accomplished if there are no dependencies between right and left subtrees.
Therefore, using the covert Asic Boost by changing the coinbase incentivizes creating blocks with a lower number of transactions.The number of SHA256 operations required to find collisions establishes a fixed delay to start Asic Boost mining.During the collision finding period the system needs to mine blocks using the traditional nonce-rolling method until the collisions are ready.In total, 6Q operations must be performed per level.If the block has 2048 transactions, then there will be 11 levels, and 66Q would need to be executed every time the transaction is changed.