Re:We Burned Down Players’ Houses in Ultima Online
by cottenio on Monday October 03, 2022 @09:13PM
(#33075705)
As a huge fan and experienced implementer of merkle trees in my modern work I really wish I had known what they were at the time :)
Merkle trees don’t solve the forgeability issue, just the unbroken chain of what you currently have. So, if you have control over the server you can just create a set of events with your “+5 billion gold” event injected in it, recalculate the tree and root and voila: forgery.
PoW doesn’t prevent this, it just adds computational time provably spent between the events so that if you DID try to inject a false record a year ago you’d have to spend that same amount of time calculating the resulting merkle tree.
Merkle trees don’t solve the forgeability issue, just the unbroken chain of what you currently have. So, if you have control over the server you can just create a set of events with your “+5 billion gold” event injected in it, recalculate the tree and root and voila: forgery.
PoW doesn’t prevent this, it just adds computational time provably spent between the events so that if you DID try to inject a false record a year ago you’d have to spend that same amount of time calculating the resulting merkle tree.
Merkle trees all the way down!