Advice for BlockCypher users: If you’re accepting unconfirmed transactions and using BlockCypher’s own Confidence Factor to do so, it shouldn’t. We factor in Opt-In RBF and significantly penalize the confidence factor.
What Bitcoin Core 0.12 Means For Bitcoin Developers
Josh Cincinnati

I’m confused by this statement. Doesn’t the RBF penalty make relying on the confidence factor safe?

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