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RE: HF 20 - lessons finally learned?
I guess with the RC system in particular you don't even have to patch or roll back, Stinc built into HF20 the ability to roll back the RC system and go back to prior bandwidth system. From steemitblog post: ""Due to this uncertainty, we added a 'fail safe' to the code that will enable witnesses to revert from the RC system back to the old bandwidth system if absolutely necessary."
In practice that is easier said than done. It requires not only witnesses but (nearly) all nodes in the whole ecosystem to make this change.
Ah... thanks for that clarification. So even if a supermajority of top witnesses made this change, if Stinc isn't on board and doesn't update api.steemit.com for instance it wouldn't work?
Correct. Transactions go through the front end nodes first. For steemit.com users (and indeed many other app users) that means nodes run by steemit.com. If those nodes don't pass through the transactions, witnesses never receive them and they don't go the blockchain.