Hmm, I think I mention that it could be changed for about $1 billion, with no clear payoff, so what are the chances someone is going to spend $1b to mess up a blockchain and lose his money?

When there are billions of records on blockchains, the price to sabotage the blockchain will be far higher than today. And sabotaging the blockchain doesn’t necessarily create any value for the attacker. Does that help?

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