Quote from: Peter R on July 05, 2015, 09:03:07 AM

Quote from: Mixles on July 05, 2015, 08:56:16 AM

Quote from: Peter R on July 05, 2015, 08:54:23 AM

Great point. Does anyone know how Bitcoin Core currently works in this regards? Is every transaction in a block (re-) verified? Or are the transactions first hashed, and if matched to a TX in mempool not re-verified, thus saving time.

It would be stupid to forward unverified txns, and it would also be stupid to verify them twice. Easy to fix, so there's no reason for it to verify twice.

https://github.com/bitcoin/bitcoin/pull/5835

Thanks. So it looks like the fix was implemented this February, and that now TXs are not re-verified if they're already in mempool?

Not sure if any solution is merged yet (see my edit above). But we are talking less than 600ms even without the extra speedup, or 10ms with the speedup.