| > Your solution regularly leads to orphans 5 blocks deep, making the network unstable. Only if China decides to hamper the speed of their miners by pointlessly trying unsuccessfully to censor transactions. > - Chinese miners (the network doesn't know that) publish a normal transaction. > - they don't include it for 30 blocks. Western nodes have already switched to a minority uncensored chain after 5 blocks, as they consider the transaction censored. > - Chinese miners include it in 31st block. > A new node joins. It follows the Chinese chain indefinitely. Okay, yes. And so does the entire rest of the network, because now the blocks are valid. Yes, this is very bad, because anyone who spent money in the shorter chain can now re-spend their coins. But critically, nothing was censored here. This is a transaction reordering, not a censorship attack. China can do the exact same thing with fewer steps. All they have to do is go back 30 blocks, and start mining blocks with the transactions in whatever order they want. Eventually their branch will be ahead and everyone will switch to it. |