Economic Security
Date: 2019-05-22
Source: https://craigwright.net/blog/bitcoin-blockchain-tech/economic-security
Reorgs and orphan blocks are not an issue with Bitcoin. To say that they are is to compound two separate issues. Firstly, can you double-spend a transaction and get away with it? Secondly, does a periodic orphan block alter the scenario?
They are separate issues. More importantly, what is being suggested is that a rogue miner with most of the hash power will be willing to risk a billion-dollar investment to make money defrauding people on small payments. Such is the issue that is being debated. There is no such thing as 100% safe.