Bitcoin P2P e-cash paper

November 15, 2008 From : Satoshi Nakamoto

There's no need for reporting of "proof of double spending" like that. If the same chain contains both spends, then the block is invalid and rejected.

Same if a block didn't have enough proof-of-work. That block is invalid and rejected. There's no need to circulate a report about it. Every node could see that and reject it before relaying it.

If there are two competing chains, each containing a different version of the same transaction, with one trying to give money to one person and the other trying to give the same money to someone else, resolving which of the spends is valid is what the whole proof-of-work chain is about.

We're not "on the lookout" for double spends to sound the alarm and catch the cheater. We merely adjudicate which one of the spends is valid. Receivers of transactions must wait a few blocks to make sure that resolution has had time to complete. Would be cheaters can try and simultaneously double-spend all they want, and all they accomplish is that within a few blocks, one of the spends becomes valid and the others become invalid. Any later double-spends are immediately rejected once there's already a spend in the main chain.

Even if an earlier spend wasn't in the chain yet, if it was already in all the nodes' pools, then the second spend would be turned away by all those nodes that already have the first spend.

Satoshi Nakamoto

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