[bitcoin-dev] Safer sighashes and more granular SIGHASH_NOINPUT

David A. Harding dave at dtrt.org
Tue Dec 11 17:47:24 UTC 2018

On Tue, Dec 11, 2018 at 10:36:59AM -0500, Russell O'Connor wrote:
> I don't believe that the default RBF policy works that way.  My
> understanding is that current policy requires an absolute fee increase (by
> an amount related to incrementalrelayfee).  

Indeed, you are correct (BIP125 rule 4[1]).

Thanks for the correction,


[1] For the curious, the relevant code from master's validation.cpp:

    // Finally in addition to paying more fees than the conflicts the
    // new transaction must pay for its own bandwidth.
    CAmount nDeltaFees = nModifiedFees - nConflictingFees;
    if (nDeltaFees < ::incrementalRelayFee.GetFee(nSize))
        return state.DoS(0, false,
                REJECT_INSUFFICIENTFEE, "insufficient fee", false,
                strprintf("rejecting replacement %s, not enough additional fees to relay; %s < %s",
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