[nhaehnle]

To be fair, if comparing Bitcoin to a sandcastle is a fair comparison, then it's better for this to be made obvious to everybody before it reaches critical mass.

Perhaps more importantly, this feature doesn't actually rely on miners being dishonest. There is no rewriting of the blockchain going on. All that is required is that miners are greedy. That is, when two conflicting transactions are in the mempool, it requires that miners prefer the transaction that comes with a higher fee.

[mike_hearn]

I think people involved with it over the long term have always said that it's a risky experiment that might fail. Bitcoin resembles a sandcastle far more than a honey badger, that's for sure.

"Honesty" is defined to mean "following the rules". The first seen rule is a part of that set. BitUndo isn't attempting to fork the chain today, but they certainly could - it's a simple extension of their model. Double spending for a fee doesn't really care whether a tx is unconfirmed or not, it simply alters the price charged.