Topic: Question about Proof-of-Work / consensus mechanism (Read 554 times)
thanks (@_@)
Chain length is measured by the sum of the difficulty of all blocks, not the mere number of blocks. Mining at a lower difficulty will therefore produce a shorter chain, even if it contains more blocks.
This.
In addition, the process for computing the difficulty can be checked by a node that receives a block with a new difficulty value. If the hacker arbitrarily lowers the difficulty of the blocks he mines, then that difficulty value will be found to be incorrect by nodes that he sends the blocks to and these blocks will be rejected by the network.
Chain length is measured by the sum of the difficulty of all blocks, not the mere number of blocks. Mining at a lower difficulty will therefore produce a shorter chain, even if it contains more blocks.
What happens if a hacker does a netsplit (copies blockchain into own LAN, disconnects from the Internet), lowers own difficulty (modifies software) and generates blocks faster than network ? (as he could, due to very low difficulty)
Then end result he will be able to over-write the global block-chain, due to longer chain ? (after reconnecting)
-Technologov
Then end result he will be able to over-write the global block-chain, due to longer chain ? (after reconnecting)
-Technologov
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