On 12/08/2015 11:41 AM, Mark Friedenbach wrote: > A far better place than the generation transaction (which I assume means > coinbase transaction?) is the last transaction in the block. That allows > you to save, on average, half of the hashes in the Merkle tree. I don't care what color that bikeshed is painted. In whatever transaction it is placed, the hash should be on the output side, That way is more future-proof since it does not crowd out other hashes which might be equally valuable to commit someday.