> This happens very rarely Not true. Orphaned blocks happen all the time. https://blockchain.info/orphaned-blocks https://blockchain.info/orphaned-blocks > Yo

> This happens very rarely Not true. Orphaned blocks happen all the time. https://blockchain.info/orphaned-blocks https://blockchain.info/orphaned-blocks > You are only uncertain in bitcoin when there are two equal (hash wise) blocks. Not true. Its possible to see the longest chain and not know about another chain that is of equal length. Nodes won't propagate chains that are of equal length to their current chain, so this is actually probably a somewhat common scenario. There has also been a number of orphaned blocks of length 2, 3, and 4. That means its totally possible (not likely, but not outside the realm of possibilities) for a node to be working on a chain and have never seen the correct previous block. https://bitcoin.stackexchange.com/questions/3343/what-is-the-longest-blockchain-fork-that-has-been-orphaned-to-date https://bitcoin.stackexchange.com/questions/3343/what-is-the... This is all exactly why many nodes don't accept transactions until there are 6 confirmations -- statistically, we shouldn't ever get to an orphan chain of length 6 even though its technically possible (outside of bugs). FWIW, I'm not arguing that IOTA is any more or less secure than Bitcoin.