we have never seen an attack like this before, and i wouldnt underestimate them, they will likely try to keep the bip110 chain limping along while spamming the other chain and threatening people
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The only incentive is valid block propagation. To ensure payment. The only way you can ensure valid block propagation is to make blocks the highest percentage of blocks would find as valid. BIP 110 being stricter would have an advantage via this incentive. Because:
BIP 110 valid =Core valid
Core valid ≠ BIP 110 valid
That is the asymmetric incentive.
Is it correct to call it an attack?
BIP110 intention is to reduce spam stored on Bitcoin network going forward.
Seems like a fix for unintended use of Bitcoin as storage for arbitrary data.
Is there a good reason to not signal for BIP110 and allow spam on the network to continue?