[bitcoin-dev] Why not Child-Pays-For-Parent?

Jeff Garzik jgarzik at gmail.com
Fri Jul 10 16:13:29 UTC 2015

CPFP is interesting, but it does not fully cover the case it is trying to
address:   If TX_a goes out without sufficient fee, sending out a new TX_b
will not help TX_a suddenly reach nodes/miners that ignored TX_a.

On Fri, Jul 10, 2015 at 12:09 PM, Richard Moore <me at ricmoo.com> wrote:

> Hey guys,
> With all the recent congestion and discussion regarding FSS-RBF, I was
> wondering if there good reasons not to have CPFP as a default policy? Or is
> it?
> I was also wondering, with CPFP, should the transaction fee be based on
> total transactions size, or the sum of each transaction’s required fee? For
> example, a third transaction C whose unconfirmed utxo from transaction B
> has an unconfirmed utxo in transaction A (all of A’s inputs are confirmed),
> with each A, B and C being ~300bytes, should C’s transaction fee be 0.0001
> btc for the ~1kb it is about to commit to the blockchain, or 0.0003 btc for
> the 3 transactions it is going to commit.
> I tried to test it out a few days ago, sending 0.0008 btc without any fee,
> then that utxo into another transaction w/ 0.0001 btc. It still hasn’t
> confirmed, which could be any of: a) CPFP doesn’t have enough hash power,
> b) the amounts are too small, c) the coins are too new, d) the fee should
> have actually been 0.0002 btc, e) the congestion is just too great; or some
> combination.
> Just curious as whatnot…
> Thanks,
> RicMoo
> .·´¯`·.¸¸.·´¯`·.¸¸.·´¯`·.¸¸.·´¯`·.¸¸.·´¯`·.¸><(((º>
> Richard Moore ~ Founder
> Genetic Mistakes Software inc.
> phone: (778) 882-6125
> email: ricmoo at geneticmistakes.com
> www: http://GeneticMistakes.com
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