To modify a block, an attacker would have to redo the proof-of-work of all previous blocks, then catch up with, and surpass the work of the honest nodes.
Ku antswisa buloko leyi nga hundza, muhlaseri u ta fanela ku endla hi vuntshwa vumbhoni bya ntirho wa buloko na tibuloko hinkwato leti nga endzhaku ka yona naswona leti nga ta yi khoma na ku hundza ntirho wa tinodi to tshembheka.