If so, is there legitimate change in scientific knowledge for doing so or is it just pressure to fit observation? (climateaudit.org)
Basically, anyone can read the chain, anyone can make legitimate changes and anyone can write a new block into the chain (as long as they follow the rules). (coindesk.com)
Similarly, if the balance of buy and sell orders changes abruptly, market participants may believe the new orders represent legitimate changes to supply and demand and therefore trade accordingly. (bloomberg.com)